/* Giao diện "Ocean Luxe": nền xanh nước biển, mực navy, viền vàng champagne.
   Mỗi môn một màu nhấn cùng độ bão hoà: CHN113 san hô, ENG303 cobalt, SSA101 ngọc lam, ENP203 chàm, ECR301 hổ phách.
   Token ở đây là nguồn duy nhất của màu; phần "OCEAN LUXE" cuối file chỉ dùng token. */
:root{
  --bg:#EAF4FD; --card:#FFFFFF; --sunk:#E3EFFA; --border:#C9DDF0; --ink:#0B2542; --muted:#4A6582; --faint:#6F89A4;
  --coffee:#0B5BB5; --coffee-dark:#08427F; --espresso:#0A2747; --caramel:#C8A24A; --cream:#E3EFFA;
  --ocean:#0B66C6; --ocean-d:#084A92; --sky:#59B7F2; --aqua:#16A6C9; --gold:#C8A24A; --gold-s:#F6EBC9; --gold-d:#7A5B12;
  --sea-a:#06264A; --sea-b:#0B66C6; --sea-c:#16A6C9;
  --accent:#0B66C6; --accent-dark:#084A92; --accent-soft:#DCEBFC; --on-accent:#FFFFFF; --hero-a:#06264A; --hero-b:#0B66C6;
  --ok:#1B8556; --ok-soft:#DDF3E8; --bad:#C23A3A; --bad-soft:#FBE4E3; --warn:#A96412; --warn-soft:#FCF0D9;
  --lv1:#1B8556; --lv2:#1F6BC9; --lv3:#B8700D; --lv4:#B0306E;
  --lv1-soft:#DDF3E8; --lv2-soft:#DEEAFB; --lv3-soft:#FBEBD0; --lv4-soft:#F9E1EC;
  --on:#0A5DB5; --on-s:#D7EAFE; --off:#76530C; --off-s:#F8EBC8;
  --chn:#C4432E; --chn-d:#99301F; --chn-s:#FBE3DD; --chn-1:#6E1F13; --chn-2:#D4513A;
  --eng:#1D63C8; --eng-d:#134A9B; --eng-s:#DDE9FB; --eng-1:#0C2A63; --eng-2:#2C7BE5;
  --ssa:#0B7F8C; --ssa-d:#075E69; --ssa-s:#D5F0F2; --ssa-1:#04383F; --ssa-2:#12A0AE;
  --enp:#5246C4; --enp-d:#3A309B; --enp-s:#E6E3FA; --enp-1:#241C68; --enp-2:#6B5FE0;
  --ecr:#A55F00; --ecr-d:#7C4600; --ecr-s:#FAEACA; --ecr-1:#573000; --ecr-2:#C27D0A;
  --shadow:0 10px 30px rgba(8,52,102,.10); --shadow-lg:0 24px 60px rgba(6,38,74,.28);
  --ui:"Be Vietnam Pro",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
  --zh:"Noto Sans SC","PingFang SC","Microsoft YaHei","Be Vietnam Pro",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,monospace;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
  --bg:#061423; --card:#0B2136; --sunk:#0F2E49; --border:#1B4263; --ink:#E4F0FC; --muted:#9BB6D2; --faint:#7490AE;
  --coffee:#1E6FC8; --coffee-dark:#4DA3F5; --espresso:#E4F0FC; --caramel:#D9B65D; --cream:#0F2E49;
  --ocean:#4DA3F5; --ocean-d:#8CC4FA; --sky:#59B7F2; --aqua:#3CC3E2; --gold:#D9B65D; --gold-s:#3A2F10; --gold-d:#E9CB7E;
  --sea-a:#0A2D55; --sea-b:#1160B5; --sea-c:#118EB0;
  --accent:#4DA3F5; --accent-dark:#8CC4FA; --accent-soft:#0F2D4A; --on-accent:#041A33; --hero-a:#0A2D55; --hero-b:#1160B5;
  --ok:#5CCB92; --ok-soft:#0E3223; --bad:#FF8F85; --bad-soft:#3A1C1C; --warn:#F0BC6A; --warn-soft:#38290F;
  --lv1:#5CCB92; --lv2:#7DB4F5; --lv3:#F0BC6A; --lv4:#F08CBB;
  --lv1-soft:#0E3223; --lv2-soft:#12294A; --lv3-soft:#38290F; --lv4-soft:#3A1830;
  --on:#8CC4FA; --on-s:#10304F; --off:#E9CB7E; --off-s:#3A2F10;
  --chn:#FF8A74; --chn-d:#FFA999; --chn-s:#3B1A14; --chn-1:#5A1A10; --chn-2:#B03E27;
  --eng:#7DB0FF; --eng-d:#A3C6FF; --eng-s:#12284F; --eng-1:#0F3475; --eng-2:#2766C8;
  --ssa:#4FD0DB; --ssa-d:#7DE0E8; --ssa-s:#0B3036; --ssa-1:#06444C; --ssa-2:#118C99;
  --enp:#A59BFF; --enp-d:#C0B8FF; --enp-s:#211D4D; --enp-1:#2B2373; --enp-2:#5748C8;
  --ecr:#F5B64F; --ecr-d:#F8CB80; --ecr-s:#382609; --ecr-1:#6A3D00; --ecr-2:#A56300;
  --shadow:0 10px 30px rgba(0,0,0,.40); --shadow-lg:0 24px 60px rgba(0,0,0,.55);
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#061423; --card:#0B2136; --sunk:#0F2E49; --border:#1B4263; --ink:#E4F0FC; --muted:#9BB6D2; --faint:#7490AE;
  --coffee:#1E6FC8; --coffee-dark:#4DA3F5; --espresso:#E4F0FC; --caramel:#D9B65D; --cream:#0F2E49;
  --ocean:#4DA3F5; --ocean-d:#8CC4FA; --sky:#59B7F2; --aqua:#3CC3E2; --gold:#D9B65D; --gold-s:#3A2F10; --gold-d:#E9CB7E;
  --sea-a:#0A2D55; --sea-b:#1160B5; --sea-c:#118EB0;
  --accent:#4DA3F5; --accent-dark:#8CC4FA; --accent-soft:#0F2D4A; --on-accent:#041A33; --hero-a:#0A2D55; --hero-b:#1160B5;
  --ok:#5CCB92; --ok-soft:#0E3223; --bad:#FF8F85; --bad-soft:#3A1C1C; --warn:#F0BC6A; --warn-soft:#38290F;
  --lv1:#5CCB92; --lv2:#7DB4F5; --lv3:#F0BC6A; --lv4:#F08CBB;
  --lv1-soft:#0E3223; --lv2-soft:#12294A; --lv3-soft:#38290F; --lv4-soft:#3A1830;
  --on:#8CC4FA; --on-s:#10304F; --off:#E9CB7E; --off-s:#3A2F10;
  --chn:#FF8A74; --chn-d:#FFA999; --chn-s:#3B1A14; --chn-1:#5A1A10; --chn-2:#B03E27;
  --eng:#7DB0FF; --eng-d:#A3C6FF; --eng-s:#12284F; --eng-1:#0F3475; --eng-2:#2766C8;
  --ssa:#4FD0DB; --ssa-d:#7DE0E8; --ssa-s:#0B3036; --ssa-1:#06444C; --ssa-2:#118C99;
  --enp:#A59BFF; --enp-d:#C0B8FF; --enp-s:#211D4D; --enp-1:#2B2373; --enp-2:#5748C8;
  --ecr:#F5B64F; --ecr-d:#F8CB80; --ecr-s:#382609; --ecr-1:#6A3D00; --ecr-2:#A56300;
  --shadow:0 10px 30px rgba(0,0,0,.40); --shadow-lg:0 24px 60px rgba(0,0,0,.55);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--ui);font-size:15px;line-height:1.6;color:var(--ink);
  background:radial-gradient(circle at top right,color-mix(in srgb,var(--caramel) 18%,transparent),transparent 28rem),
             radial-gradient(circle at bottom left,color-mix(in srgb,var(--accent) 8%,transparent),transparent 26rem),var(--bg)}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
.wrap{width:min(1120px,100%);margin:0 auto;padding-inline:16px;padding-block:14px 32px}
a{color:var(--accent)}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 60%,transparent);outline-offset:2px}
[lang="zh"],.zh{font-family:var(--zh)}
.num{font-variant-numeric:tabular-nums}

/* top pills */
.toplinks{display:flex;flex-wrap:wrap;gap:10px;margin:8px 0 18px}
.pill{display:inline-flex;align-items:center;gap:6px;padding:9px 15px;border-radius:999px;background:var(--accent-soft);
  color:var(--accent-dark);border:1px solid var(--border);font-weight:700;font-size:13px;text-decoration:none;cursor:pointer}
.pill:hover{background:var(--card)}
.pill.ghost{background:var(--card)}

/* hero */
.hero{position:relative;overflow:hidden;border-radius:22px;padding:30px 30px 26px;color:#fff;
  background:linear-gradient(135deg,var(--hero-a),var(--hero-b));box-shadow:var(--shadow-lg)}
.hero:after{content:"";position:absolute;width:250px;height:250px;border-radius:50%;right:-80px;top:-110px;background:rgba(255,255,255,.08)}
.hero .brand{font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;opacity:.9}
.hero h1{font-size:clamp(25px,4.2vw,36px);line-height:1.2;margin:8px 0 10px;text-wrap:balance}
.hero p{margin:0;max-width:760px;line-height:1.7;opacity:.93}
.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px;position:relative;z-index:1}
.badges>span{padding:6px 11px;border-radius:999px;background:rgba(255,255,255,.14);font-size:12.5px}
.hero .glyph{position:absolute;right:26px;bottom:10px;font-size:92px;line-height:1;opacity:.13;font-weight:800;pointer-events:none;font-family:var(--zh)}

/* sections */
.section-title{margin:28px 0 6px;color:var(--espresso);font-size:22px;text-wrap:balance}
.section-sub{margin:0 0 16px;color:var(--muted)}
.card{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:20px;box-shadow:var(--shadow)}
.note{background:var(--accent-soft);border:1px solid var(--border);border-radius:16px;padding:16px 18px;color:var(--ink)}
.note strong{color:var(--accent-dark)}

/* buttons */
.btn{font:inherit;font-weight:700;font-size:14px;border:0;border-radius:11px;padding:11px 16px;cursor:pointer;
  background:var(--accent);color:var(--on-accent);display:inline-flex;align-items:center;gap:6px;justify-content:center;text-decoration:none;transition:.15s}
.btn:hover{background:var(--accent-dark)}
.btn.sec{background:var(--sunk);color:var(--ink);border:1px solid var(--border)}
.btn.sec:hover{background:var(--accent-soft)}
.btn.sm{padding:7px 12px;font-size:13px;border-radius:9px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.row{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.spacer{flex:1}

/* tabs (giống hàng nút trang HSK2) */
.tabs{display:flex;flex-wrap:wrap;gap:10px;margin:22px 0 18px;padding:10px;border-radius:14px;background:var(--accent-soft)}
.tab{font:inherit;font-size:14px;font-weight:600;border:0;border-radius:10px;padding:11px 14px;cursor:pointer;
  background:var(--accent);color:var(--on-accent);opacity:.82}
.tab:hover{opacity:1}
.tab[aria-selected="true"]{background:var(--accent-dark);opacity:1;box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 35%,transparent)}
.panel{display:block}

/* chips & badges */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{font:inherit;font-size:13px;font-weight:600;padding:7px 12px;border-radius:999px;border:1px solid var(--border);
  background:var(--card);color:var(--ink);cursor:pointer}
.chip[aria-pressed="true"]{background:var(--accent);color:var(--on-accent);border-color:transparent}
.lv{display:inline-block;font-size:12px;font-weight:700;padding:3px 9px;border-radius:999px;white-space:nowrap}
.lv1{background:var(--lv1-soft);color:var(--lv1)} .lv2{background:var(--lv2-soft);color:var(--lv2)}
.lv3{background:var(--lv3-soft);color:var(--lv3)} .lv4{background:var(--lv4-soft);color:var(--lv4)}
.tag{display:inline-block;font-size:12px;padding:3px 9px;border-radius:999px;background:var(--sunk);color:var(--muted)}

/* grid of stat tiles */
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))} .g3{grid-template-columns:repeat(3,minmax(0,1fr))} .g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media (max-width:860px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:560px){.g2,.g3,.g4{grid-template-columns:1fr}}
.stat{padding:16px;border-radius:14px;background:var(--card);border:1px solid var(--border)}
.stat .k{font-size:12px;color:var(--muted);font-weight:600;letter-spacing:.04em;text-transform:uppercase}
.stat .v{font-size:26px;font-weight:800;color:var(--espresso);font-variant-numeric:tabular-nums}
.bar{height:8px;border-radius:999px;background:var(--sunk);overflow:hidden}
.bar>i{display:block;height:100%;background:var(--accent);border-radius:999px}

/* question card */
.qcard{background:var(--card);border:1px solid var(--border);border-radius:18px;padding:22px;box-shadow:var(--shadow)}
.qmeta{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-bottom:12px;font-size:13px;color:var(--muted)}
.qtext{font-size:18px;line-height:1.7;margin:4px 0 14px;color:var(--ink);overflow-wrap:anywhere}
[data-subject="chn"] .qtext{font-size:20px}
.qtext u.seg{text-decoration:none;border-bottom:2.5px solid var(--accent);padding:0 2px;background:var(--accent-soft);border-radius:3px}
.qtext sup{font-size:11px;color:var(--accent-dark);font-weight:800}
.qimg{display:block;max-width:min(100%,460px);border-radius:12px;border:1px solid var(--border);margin:6px 0 14px;background:#fff}
.opts{display:grid;gap:10px}
.opt{font:inherit;text-align:left;display:flex;gap:12px;align-items:flex-start;width:100%;padding:12px 14px;border-radius:12px;
  border:1.5px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;font-size:16px;line-height:1.5;transition:.12s}
[data-subject="chn"] .opt{font-size:18px}
.opt:hover:not(:disabled){border-color:var(--accent);background:var(--accent-soft)}
.opt .key{flex:none;width:28px;height:28px;border-radius:8px;display:grid;place-items:center;font-weight:800;font-size:13px;background:var(--sunk);color:var(--muted);font-family:var(--ui)}
.opt .txt{min-width:0;overflow-wrap:anywhere}
.opt.right{border-color:var(--ok);background:var(--ok-soft)} .opt.right .key{background:var(--ok);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)} .opt.wrong .key{background:var(--bad);color:#fff}
.opt.picked{border-color:var(--accent);background:var(--accent-soft)} .opt.picked .key{background:var(--accent);color:var(--on-accent)}
.opt:disabled{cursor:default}
.explain{margin-top:14px;padding:14px 16px;border-radius:12px;border:1px dashed var(--border);background:var(--sunk);line-height:1.65}
.explain b.ok{color:var(--ok)} .explain b.bad{color:var(--bad)}
.src{font-size:12.5px;color:var(--faint);margin-top:8px}
.prog{display:flex;align-items:center;gap:12px;margin:0 0 14px;font-size:13px;color:var(--muted)}
.prog .bar{flex:1}
.speak{font:inherit;border:1px solid var(--border);background:var(--card);color:var(--accent-dark);border-radius:999px;padding:4px 10px;cursor:pointer;font-size:13px}

/* hub */
.subj-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}
@media (max-width:1040px){.subj-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:860px){.subj-grid{grid-template-columns:1fr}}
.subj{display:flex;flex-direction:column;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:18px;padding:20px;box-shadow:var(--shadow);transition:.2s}
.subj:hover{transform:translateY(-3px)}
.subj .code{font-size:12px;font-weight:800;letter-spacing:.1em}
.subj h3{margin:0;font-size:21px;color:var(--espresso);line-height:1.35}
.subj p{margin:0;color:var(--muted);font-size:13.5px;flex:1}
.daypill{display:inline-flex;gap:6px;align-items:center;font-size:12.5px;padding:5px 10px;border-radius:999px;background:var(--sunk);color:var(--ink)}
.tt-wrap{overflow-x:auto;border-radius:16px;border:1px solid var(--border);background:var(--card)}
table.tt{border-collapse:collapse;width:100%;min-width:720px;font-size:13px}
.tt th,.tt td{border-bottom:1px solid var(--border);border-right:1px solid var(--border);padding:8px;vertical-align:top}
.tt thead th{background:var(--coffee);color:#fff;font-weight:700;text-align:left}
.tt thead th small{display:block;font-weight:500;opacity:.85}
.tt th.slot{background:var(--sunk);color:var(--muted);font-weight:600;width:110px;white-space:nowrap}
.tt td.today{background:color-mix(in srgb,var(--caramel) 12%,transparent)}
.cls{display:block;border-radius:10px;padding:8px 10px;text-decoration:none;color:var(--ink);border:1px solid var(--border);background:var(--card)}
.cls b{display:block;font-size:13.5px}
.cls small{color:var(--muted)}
.cls.chn{border-left:5px solid #B8342A} .cls.eng{border-left:5px solid #3A5BA8} .cls.ssa{border-left:5px solid #23907A} .cls.enp{border-left:5px solid #9C3B86} .cls.ecr{border-left:5px solid #C8641C}
.cls.off{opacity:.55;border-left:5px solid var(--faint)}
a.cls:hover{background:var(--accent-soft)}
.today-card{display:grid;grid-template-columns:auto 1fr;gap:16px;align-items:center}
@media (max-width:560px){.today-card{grid-template-columns:1fr}}
.datebox{width:84px;height:84px;border-radius:18px;background:var(--coffee);color:#fff;display:grid;place-items:center;text-align:center;line-height:1.1}
.datebox b{font-size:30px}
footer.foot{margin:32px 0 10px;padding:22px 16px;text-align:center;border-radius:18px;color:#fff;background:linear-gradient(135deg,var(--hero-a),var(--hero-b))}
footer.foot p{margin:4px 0;opacity:.92}

/* games */
.match{display:grid;grid-template-columns:1fr 1fr;gap:12px}
@media (max-width:560px){.match{grid-template-columns:1fr}}
.mcol{display:grid;gap:10px;align-content:start}
.mitem{font:inherit;text-align:left;padding:12px;border-radius:12px;border:1.5px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;line-height:1.45;overflow-wrap:anywhere}
.mitem.sel{border-color:var(--accent);background:var(--accent-soft)}
.mitem.done{border-color:var(--ok);background:var(--ok-soft);opacity:.75;cursor:default}
.mitem.shake{animation:shake .35s}
@keyframes shake{25%{transform:translateX(-5px)}75%{transform:translateX(5px)}}
.tower{display:flex;flex-direction:column-reverse;gap:4px}
.floor{display:flex;justify-content:space-between;padding:5px 12px;border-radius:8px;font-size:13px;background:var(--sunk);color:var(--muted);font-variant-numeric:tabular-nums}
.floor.cur{background:var(--accent);color:var(--on-accent);font-weight:700}
.floor.passed{background:var(--ok-soft);color:var(--ok)}
.lives{font-size:20px;letter-spacing:2px}
.big{font-size:44px;font-weight:800;color:var(--espresso);font-variant-numeric:tabular-nums;line-height:1}
.flash{perspective:1000px;cursor:pointer}
.flash-in{position:relative;min-height:240px;transition:transform .5s;transform-style:preserve-3d}
.flash.flip .flash-in{transform:rotateY(180deg)}
.face{position:absolute;inset:0;backface-visibility:hidden;border-radius:18px;border:1px solid var(--border);background:var(--card);padding:22px;box-shadow:var(--shadow);overflow:auto}
.face.back{transform:rotateY(180deg);background:var(--accent-soft)}
.navgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(38px,1fr));gap:6px}
.navgrid button{font:inherit;font-size:12.5px;padding:7px 0;border-radius:8px;border:1px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;font-variant-numeric:tabular-nums}
.navgrid button.ans{background:var(--accent-soft);border-color:var(--accent)}
.navgrid button.cur{outline:2px solid var(--accent)}
.navgrid button.r{background:var(--ok-soft);border-color:var(--ok)} .navgrid button.w{background:var(--bad-soft);border-color:var(--bad)}
.timer{font-family:var(--mono);font-weight:700;font-size:18px;color:var(--accent-dark);font-variant-numeric:tabular-nums}
.list .li{padding:14px 0;border-bottom:1px solid var(--border)}
.list .li:last-child{border-bottom:0}
.list .qtext{font-size:15.5px;margin:6px 0}
[data-subject="chn"] .list .qtext{font-size:17px}
.list ol{margin:6px 0 0;padding-left:22px}
.list li.ok{color:var(--ok);font-weight:700}
input[type=search],select{font:inherit;padding:10px 12px;border-radius:10px;border:1px solid var(--border);background:var(--card);color:var(--ink);min-width:0}
input[type=search]{flex:1 1 220px}
.confirm{display:flex;flex-wrap:wrap;gap:10px;align-items:center;padding:12px 14px;border-radius:12px;background:var(--warn-soft);border:1px solid var(--border)}
.muted{color:var(--muted)}
.center{text-align:center}
.mt{margin-top:14px}
.empty{padding:28px;text-align:center;color:var(--muted);border:1px dashed var(--border);border-radius:16px;background:var(--card)}
@media (max-width:600px){
  .hero{padding:22px 18px;border-radius:17px} .hero .glyph{font-size:64px}
  .tabs{gap:7px;padding:8px} .tab{padding:9px 11px;font-size:13px}
  .qcard{padding:16px} .qtext{font-size:16.5px} [data-subject="chn"] .qtext{font-size:18.5px}
}

/* ===== Lý thuyết song ngữ ===== */
.small{font-size:13px}
.th-intro{margin:0;line-height:1.65}
.th-intro .en,.th-head .muted .en{display:block;color:var(--muted);font-size:13.5px;margin-top:4px}
.th-head .muted .vi{display:block}
.th-pick{display:none;align-items:center;gap:8px}
.th-pick select{flex:1;min-width:0}
.th-layout{display:grid;grid-template-columns:290px minmax(0,1fr);gap:18px;align-items:start}
.th-nav{position:sticky;top:calc(env(safe-area-inset-top,0px) + 10px);max-height:calc(100vh - 40px);overflow:auto;padding:12px}
.th-main{min-width:0}
@media (max-width:860px){.th-layout{grid-template-columns:1fr}.th-nav{display:none}.th-pick{display:flex}}
.th-group{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:14px 6px 6px}
.th-group .en{display:none}
.th-item{font:inherit;display:flex;gap:8px;align-items:flex-start;width:100%;text-align:left;padding:8px 10px;border-radius:10px;border:0;background:transparent;color:var(--ink);cursor:pointer;line-height:1.4}
.th-item:hover{background:var(--accent-soft)}
.th-item.cur{background:var(--accent);color:var(--on-accent)}
.th-item .no{flex:none;font-size:12px;font-weight:800;min-width:54px;opacity:.85;padding-top:2px}
.th-item .tt{flex:1;min-width:0}
.th-item .tt .en{display:block;font-size:12px;opacity:.75}
.th-item .seen{flex:none;color:var(--ok);font-weight:800}
.th-item.cur .seen{color:inherit}
.th-item.notes{font-weight:700;background:var(--warn-soft);margin-bottom:4px}
.th-item.notes.cur{background:var(--warn);color:#fff}
.th-kicker{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.th-title{margin:10px 0 4px;font-size:clamp(21px,3vw,27px);line-height:1.3;color:var(--espresso);text-wrap:balance}
.th-title .en{display:block;font-size:.62em;font-weight:600;color:var(--muted);margin-top:2px}
.th-sub{font-size:22px;color:var(--accent-dark);margin:4px 0 6px;font-family:var(--zh)}
.goal{margin:14px 0 6px;padding:12px 14px;border-radius:12px;background:var(--accent-soft);border:1px solid var(--border)}
.goal b{color:var(--accent-dark);font-size:13px}
.th-sec{margin-top:22px;padding-top:16px;border-top:1px dashed var(--border)}
.th-sec h3{display:flex;gap:10px;align-items:flex-start;margin:0 0 10px;font-size:17.5px;color:var(--espresso)}
.th-sec h3 .en{display:block;font-size:13.5px;font-weight:600;color:var(--muted)}
.secno{flex:none;width:28px;height:28px;border-radius:8px;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;font-size:13px}
.forms{display:flex;flex-direction:column;gap:6px;margin:6px 0 10px}
.forms code{display:block;font-family:var(--mono);font-size:13.5px;font-weight:700;padding:9px 12px;border-radius:10px;background:var(--sunk);border-left:4px solid var(--accent);color:var(--ink);white-space:pre-wrap;overflow-wrap:anywhere}
.forms code[lang="zh"]{font-family:var(--zh)}
ul.pts{margin:6px 0;padding-left:20px;display:grid;gap:8px;max-width:78ch}
ul.pts li .en,.terms dd .en,.notes li .en,.goal .en,.warn .en,.ex .en{display:block;color:var(--muted);font-size:13.5px}
.terms{display:grid;gap:10px;margin:8px 0}
.terms>div{padding:10px 12px;border-radius:12px;background:var(--card);border:1px solid var(--border)}
.terms dt{font-weight:800;color:var(--accent-dark)}
.terms dd{margin:2px 0 0}
.tblw{overflow-x:auto;margin:10px 0;border-radius:12px;border:1px solid var(--border)}
table.th-tbl{border-collapse:collapse;width:100%;font-size:14px;min-width:420px}
.th-tbl th{background:var(--sunk);text-align:left;padding:8px 10px;font-size:12.5px;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.th-tbl td{padding:8px 10px;border-top:1px solid var(--border);vertical-align:top}
.th-tbl .hz{font-size:20px;white-space:nowrap}
.th-tbl .py{color:var(--accent-dark);font-weight:600;white-space:nowrap}
.exs{display:grid;gap:8px;margin:10px 0}
.ex{padding:10px 12px;border-radius:12px;background:var(--sunk)}
.ex .exk{font-size:11.5px;font-weight:800;color:var(--accent-dark);text-transform:uppercase;margin-right:4px}
.zh-ex .hz{font-size:21px;line-height:1.5}
.zh-ex .py{color:var(--accent-dark);font-size:14px}
.warn{margin:10px 0;padding:10px 12px;border-radius:12px;background:var(--warn-soft);border:1px solid var(--border)}
.warn b{font-size:13px;color:var(--warn)}
.notebox{margin-top:24px;padding:16px;border-radius:14px;background:var(--warn-soft);border:1px solid color-mix(in srgb,var(--warn) 35%,var(--border))}
.notebox h3{margin:0 0 8px;color:var(--warn);font-size:17px}
ul.notes{margin:0;padding-left:20px;display:grid;gap:10px}
.nx{display:flex;flex-wrap:wrap;gap:6px;margin-top:5px}
.nx span{font-size:13.5px;padding:3px 9px;border-radius:8px;font-weight:600}
.nx .bad{background:var(--bad-soft);color:var(--bad);text-decoration:line-through;text-decoration-thickness:1px}
.nx .good{background:var(--ok-soft);color:var(--ok)}
.th-notes-grp{margin-top:16px}
.linkbtn{font:inherit;font-weight:800;border:0;background:none;color:var(--accent-dark);cursor:pointer;padding:0;text-align:left}
.linkbtn .en{font-weight:600;color:var(--muted);margin-left:6px}
/* chế độ ngôn ngữ */
html[data-lang="vi"] .en,html[data-lang="vi"] .en-c{display:none!important}
html[data-lang="en"] .vi,html[data-lang="en"] .vi-c{display:none!important}
html[data-lang="en"] ul.pts li .en,html[data-lang="en"] .terms dd .en,html[data-lang="en"] .notes li .en,html[data-lang="en"] .goal .en,html[data-lang="en"] .warn .en,html[data-lang="en"] .ex .en,
html[data-lang="en"] .th-title .en,html[data-lang="en"] .th-sec h3 .en,html[data-lang="en"] .th-item .tt .en{display:block;color:inherit;font-size:inherit;font-weight:inherit}
html[data-lang="en"] .th-item .tt .en{opacity:1;font-size:14px}
html[data-lang="en"] .th-group .en{display:inline}
/* ===== Luyện nghe ===== */
.aud{width:100%;margin:8px 0 4px}
.lqs{display:grid;gap:14px;margin-top:12px}
.lq{padding:14px;border-radius:14px;border:1px solid var(--border);background:var(--card)}
.lopts{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:8px;margin-top:8px}
.lopts .opt{font-size:15px;padding:9px 12px}
[data-subject="chn"] .lopts .opt{font-size:16px}
.ldesc{margin:6px 0;color:var(--ink)}
ol.hset{margin:6px 0;padding-left:22px;color:var(--ink)}
ol.hset li::marker{font-weight:800;color:var(--accent-dark)}
.lmark{margin-top:8px}

/* ---------- 📑 Mục lục ---------- */
.toc-head input[type=search]{width:100%;font:inherit;padding:11px 14px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--ink)}
.toc-jump{display:flex;flex-wrap:wrap;gap:8px}
.toc-jump a{font-size:13px;font-weight:600;color:var(--accent-dark);background:var(--accent-soft);padding:6px 11px;border-radius:999px;text-decoration:none}
.toc-sec h3{margin:0 0 8px;font-size:17px}
.toc-sec{scroll-margin-top:calc(env(safe-area-inset-top,0px) + 12px)}
.toc-row{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:6px 12px;align-items:center;padding:10px 0;border-top:1px solid var(--border)}
.toc-row:first-of-type{border-top:0}
.toc-t{display:flex;gap:10px;align-items:baseline;min-width:0}
.toc-t .tt{font-weight:600}
.toc-t .tag{flex:none}
.toc-a{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:flex-end}
.toc-qs{grid-column:1/-1}
.toc-qs summary{cursor:pointer;font-size:13px;color:var(--muted);font-weight:600}
.navgrid button.r{background:var(--ok-soft);border-color:var(--ok)} .navgrid button.w{background:var(--bad-soft);border-color:var(--bad)}
.toc-hits{margin:0;padding-left:22px;display:grid;gap:6px}
.toc-hits .linkbtn{text-align:left}
.toc-fab{position:fixed;right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:40;font:inherit;font-weight:700;font-size:14px;
  padding:11px 16px;border-radius:999px;border:0;background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow-lg);cursor:pointer}
.toc-fab:hover{background:var(--accent-dark)}
@media (max-width:560px){.toc-row{grid-template-columns:1fr}.toc-a{justify-content:flex-start}.toc-fab span{display:none}.toc-fab{padding:12px 14px}}
@media print{.toc-fab{display:none}}
.toc-hits .linkbtn{font-weight:500;color:var(--ink)}
body:has(.toc-fab) .foot{margin-bottom:64px}

/* ---------- ✍️ Phần viết (sách bài tập) ---------- */
.wr-score{min-width:180px;display:grid;gap:4px;text-align:right}
.wr-score b{font-size:24px;color:var(--espresso)}
.wr-sec h3{margin:0 0 6px;font-size:17px;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.wr-sec .secno{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;background:var(--accent);color:var(--on-accent);font-size:14px}
.wi{padding:14px 0;border-top:1px solid var(--border);display:grid;gap:8px}
.wi:first-of-type{border-top:0}
.wi-q{font-size:17px;line-height:1.6}
.wi-q .num{color:var(--accent-dark);margin-right:4px}
.zh{font-family:var(--zh)}
.wrow{display:flex;gap:8px;align-items:center}
.wlab{font-weight:700;color:var(--muted)}
.win{flex:1;min-width:0;font:inherit;font-family:var(--zh);font-size:18px;padding:10px 12px;border-radius:10px;border:1.5px dashed var(--border);background:var(--sunk);color:var(--ink)}
.win:focus{outline:none;border-style:solid;border-color:var(--accent);background:var(--card)}
.wi.ok .win{border:1.5px solid var(--ok);background:var(--ok-soft)}
.wi.bad .win{border:1.5px solid var(--bad);background:var(--bad-soft)}
.wtok{display:flex;flex-wrap:wrap;gap:6px}
.wchip{font:inherit;font-family:var(--zh);font-size:16px;padding:6px 11px;border-radius:9px;border:1px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer}
.wchip:hover{border-color:var(--accent)}
.wchip:disabled{opacity:.35;cursor:default}
.wchip.clr{font-family:var(--ui);font-size:13px;color:var(--muted)}
.wtok.hint{padding:8px;border-radius:10px;background:var(--warn-soft)}
.wtools{display:flex;gap:14px;flex-wrap:wrap;align-items:center}
.linkbtn.small{font-size:13px;font-weight:600}
.wres{font-size:15px}
.wres .ok{color:var(--ok);font-weight:800} .wres .bad{color:var(--bad);font-weight:800}
@media (max-width:560px){.wr-score{text-align:left}.wi-q{font-size:16px}}
.wdiff{margin-top:6px;font-size:17px}
.wdiff del{color:var(--bad);background:var(--bad-soft);text-decoration:line-through;border-radius:3px;padding:0 1px}
.wdiff ins{color:var(--ok);background:var(--ok-soft);text-decoration:none;border-radius:3px;padding:0 1px;font-weight:700}
.werr{margin:6px 0 0;padding-left:20px;font-size:14px;display:grid;gap:3px}
.werr li::marker{color:var(--bad)}
.wi{grid-template-columns:minmax(0,1fr)} .wr-sec{min-width:0} .wi-q,.wres,.wdiff{overflow-wrap:anywhere}
[hidden]{display:none!important}
.wvi{font-size:14px;color:var(--muted);line-height:1.5}
.wvi.small{font-size:13px;margin-top:4px}
.wr-zh .wvi{display:none}
.wi-q .big{font-size:24px}
.wi-q .py{font-size:19px;font-weight:600;color:var(--accent-dark)}
.win.pyin{font-family:var(--ui)}

/* thanh công cụ dính của Phần viết: chỉnh nghĩa song ngữ */
.wr-bar{position:sticky;top:env(safe-area-inset-top,0px);z-index:30;display:flex;flex-wrap:wrap;gap:8px 10px;align-items:center;
  padding:10px 14px;border-radius:14px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.wr-bar .chip{padding:6px 11px}
.wr-bar-t{font-size:15px}
.wvibtn{display:none}
.wr-tap .wvibtn{display:inline}
.wr-tap .wi:not(.showvi) .wvi{display:none}
@media (max-width:560px){.wr-bar{padding:8px 10px}.wr-bar .chip{font-size:12px;padding:5px 9px}}
.wr-bi .whintbtn{display:none}
.wchip{display:inline-flex;flex-direction:column;align-items:center;gap:1px;line-height:1.25}
.wchip .wg{display:none;font-family:var(--ui);font-size:11px;color:var(--muted);font-weight:500;max-width:9em;white-space:normal;text-align:center}
.wr-bi .wchip .wg{display:block}
.wchip:disabled .wg{opacity:.8}

/* ---------- ✍️ Tự luận (ECR301): đề luyện đọc + bài tập viết ---------- */
.oq-intro{margin:0 0 6px;line-height:1.65}
.oq-vi{display:block}
.oq-en{display:block;color:var(--muted);font-size:13.5px}
.oq-sub{display:block;font-size:14px;font-weight:500;color:var(--muted);margin-top:2px}
.oq-text h3{margin:10px 0 2px;font-size:20px;color:var(--espresso);line-height:1.35}
.oq-text ol{margin:14px 0 0;padding-left:26px;display:grid;gap:12px;font-size:16px;line-height:1.75;max-width:74ch}
.oq-text ol li::marker{color:var(--accent-dark);font-weight:700;font-size:13px}
.oq-h{margin:0 0 4px;font-size:17px;color:var(--espresso)}
.oq{padding:16px 0;border-top:1px solid var(--border);display:grid;gap:10px;grid-template-columns:minmax(0,1fr)}
.oq-h + .oq{border-top:0}
.oq-sec{margin:18px 0 0;padding:10px 0 4px;font-size:14px;font-weight:700;color:var(--accent);border-top:2px solid var(--border)}
.oq-h + .oq-sec{margin-top:6px;border-top:0}
.oq-sec + .oq{border-top:0;padding-top:8px}
.oq-q{font-size:16.5px;line-height:1.6;font-weight:600;overflow-wrap:anywhere}
.oq-q .num{color:var(--accent-dark);margin-right:4px}
.oq.ok .oq-q .num::after{content:" ✓";color:var(--ok)} .oq.bad .oq-q .num::after{content:" ↺";color:var(--warn)}
.oq-in{width:100%;font:inherit;font-size:16px;line-height:1.65;padding:12px 14px;border-radius:12px;border:1.5px dashed var(--border);background:var(--sunk);color:var(--ink);resize:vertical;min-height:96px}
.oq-in:focus{outline:none;border-style:solid;border-color:var(--accent);background:var(--card)}
.oq-wc{color:var(--muted)} .oq-wc.in{color:var(--ok);font-weight:700} .oq-wc.under{color:var(--warn)} .oq-wc.over{color:var(--bad);font-weight:700}
.oq-frame{display:grid;gap:6px}
.oq-frame code{display:block;font-family:var(--ui);font-size:13.5px;padding:7px 11px;border-radius:9px;background:var(--sunk);border-left:3px solid var(--accent);overflow-wrap:anywhere}
.oq-ans{display:grid;gap:10px;padding:14px 16px;border-radius:14px;background:var(--accent-soft);border:1px solid var(--border)}
.oq-ans[hidden]{display:none}
.oq-ans b{color:var(--accent-dark);font-size:13px}
.oq-pts ul{margin:6px 0 0;padding-left:20px;display:grid;gap:6px}
.oq-model p{margin:8px 0 0;font-size:15.5px;line-height:1.7;max-width:74ch;overflow-wrap:anywhere}
.oq-mark{padding-top:4px}
@media (max-width:560px){.oq-text ol{font-size:15.5px;padding-left:22px}.oq-q{font-size:16px}}

/* ===== Tinh chỉnh 07/10: gọn hơn trên điện thoại, đều hơn trên máy tính ===== */
/* Thanh tab trên điện thoại: một hàng vuốt ngang, tab đang chọn tự cuộn vào giữa */
@media (max-width:600px){
  .tabs{flex-wrap:nowrap;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none;margin:16px 0 14px;
    -webkit-mask-image:linear-gradient(90deg,#000 calc(100% - 34px),transparent);mask-image:linear-gradient(90deg,#000 calc(100% - 34px),transparent)}
  .tabs::-webkit-scrollbar{display:none}
  .tabs.at-end{-webkit-mask-image:none;mask-image:none}
  .tab{flex:none;white-space:nowrap}
}
/* Ô số liệu: 2 cột trên điện thoại thay vì 4 ô xếp dọc */
@media (max-width:560px){
  .g4{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
  .g4 .stat{padding:12px 13px}
  .g4 .stat .v{font-size:22px}
  .g4 .stat .muted{font-size:12.5px;line-height:1.4}
  .g4 .stat .btn{width:100%}
}
/* Tổng quan: bài lý thuyết theo nhóm */
.th-groups{display:grid;gap:14px}
.th-grp-h{font-size:12px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin:0 2px 7px;cursor:pointer}
.th-grp:not([open]) .th-grp-h{margin-bottom:0}
@media (min-width:601px){.th-grp-h{list-style:none;cursor:default;pointer-events:none}.th-grp-h::-webkit-details-marker{display:none}}
@media (max-width:600px){.th-groups{gap:8px}.th-grp{border:1px solid var(--border);border-radius:12px;background:var(--card);padding:11px 12px}.th-grp[open] .th-grp-h{margin-bottom:9px}.th-grp-h{margin:0;font-size:12.5px}}
.th-grp-h .num{font-weight:600;letter-spacing:0;text-transform:none;color:var(--faint)}
.chip{text-align:left;line-height:1.35}
.chip:hover{border-color:var(--accent)}
.chip[aria-pressed="true"]:hover{border-color:transparent}
.chip.seen{border-color:color-mix(in srgb,var(--ok) 45%,var(--border));color:var(--ink)}
/* Lý thuyết trên màn hình hẹp: phần giới thiệu gập lại */
.th-about summary{cursor:pointer;font-weight:700;font-size:14px;color:var(--accent-dark);list-style-position:inside}
.th-about summary .en{font-weight:500;color:var(--muted)}
.th-about[open] summary{margin-bottom:8px}
.th-about + .row.mt{margin-top:12px}
/* Trang chủ: thời khoá biểu đều cột, cột ca học dính bên trái khi vuốt ngang */
table.tt{table-layout:fixed}
.tt th.slot{position:sticky;left:0;z-index:1}
.tt thead th.slot{z-index:2}
.tt thead th.now{box-shadow:inset 0 -4px 0 var(--caramel)}
.tt-hint{display:none;margin:8px 2px 0;font-size:12.5px;color:var(--faint);text-align:center}
@media (max-width:780px){
  table.tt{min-width:740px}
  .tt th.slot{width:74px;white-space:normal;font-size:12px;padding:8px 6px}
  .tt-hint{display:block}
}
/* Trang chủ: 5 thẻ môn xếp 3 + 2 cho cân */
@media (min-width:1041px){
  .subj-grid{grid-template-columns:repeat(6,minmax(0,1fr))}
  .subj-grid .subj{grid-column:span 2}
  .subj-grid .subj:nth-child(4):nth-last-child(2),.subj-grid .subj:nth-child(5):last-child{grid-column:span 3}
}
@media (min-width:861px) and (max-width:1040px){
  .subj-grid .subj:nth-child(5):last-child{grid-column:1 / -1}
}
.subj .row:last-child{margin-top:2px}
@media (max-width:600px){
  table.th-tbl:not(:has(th:nth-child(3))){min-width:0}
  .th-tbl td{overflow-wrap:break-word}
  .badges{gap:6px}
  .badges>span{font-size:12px;padding:5px 10px}
  .toplinks{gap:8px;margin:6px 0 14px}
  .pill{padding:8px 13px}
}
@media (max-width:560px){
  .qnav{display:grid;grid-template-columns:1fr 1fr;gap:8px}
  .qnav .spacer{display:none}
  .qnav #prev{order:1} .qnav #next{order:2} .qnav #quit{order:3;grid-column:1 / -1}
}

/* ---- 🎧 câu nghe · danh sách audio · đề HSK thật ---- */
.tag.lt{background:var(--accent-soft);color:var(--accent-dark);font-weight:700}
.qaud{margin:10px 0 4px;display:flex;flex-direction:column;gap:6px}
.qaud.row{flex-direction:row;flex-wrap:wrap;align-items:center;gap:8px}
audio{width:100%;max-width:520px;height:40px;display:block}
.auds{display:grid;gap:10px;margin-top:10px}
.aud-it{border:1px solid var(--border);border-radius:12px;padding:10px 12px;background:var(--card);display:grid;gap:6px}
.aud-it .num{color:var(--accent);min-width:44px}
details.tx{font-size:15px}
details.tx summary{cursor:pointer;color:var(--muted);font-size:13px;font-weight:600;padding:4px 0;min-height:32px;display:flex;align-items:center}
details.tx div{padding:6px 0 2px;line-height:1.7;overflow-wrap:anywhere}
details.tx div[lang="zh"]{font-family:var(--zh);font-size:17px}
.hsk-player{display:grid;gap:8px;padding:12px;border-radius:12px;background:var(--sunk)}
.hsk-pg{display:grid;gap:12px}
.hsk-img{width:100%;max-width:720px;margin:0 auto;display:block;border-radius:8px;border:1px solid var(--border);background:#fff}
.hsk-qs{display:grid;gap:8px}
.hsk-q{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:6px 8px;border-radius:10px}
.hsk-q .num{min-width:28px;font-weight:800}
.hsk-q.ok{background:var(--ok-soft)} .hsk-q.no{background:var(--bad-soft)}
.hsk-b{display:flex;gap:6px;flex-wrap:wrap}
.hb{font:inherit;font-weight:700;min-width:44px;min-height:44px;border-radius:10px;border:1.5px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;touch-action:manipulation}
.hb:hover:not(:disabled){border-color:var(--accent)}
.hb.sel{background:var(--accent);color:var(--on-accent);border-color:transparent}
.hb.right{border:2px dashed var(--ok);color:var(--ok)}
.hb.wrong{background:var(--bad);color:#fff;border-color:transparent}
.hres{font-size:13px;color:var(--muted);font-weight:600}
.big small{font-size:.45em;color:var(--muted)}
#hx .chip small{font-weight:500}

/* ---- ảnh trang bài tập (sprite) ---- */
.sprite{width:100%;background-repeat:no-repeat;background-color:#fff;border:1px solid var(--border);border-radius:8px;margin:6px 0}

/* ===== Bàn phím ảo tiếng Trung (ime.js) ===== */
body.zhkb-open{padding-bottom:var(--zkh,0px)}
body.zhkb-open .toc-fab,body.zhkb-open .zh-fab{display:none}
.zh-fab{position:fixed;left:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));z-index:40;font:inherit;font-weight:700;font-size:14px;
  padding:11px 16px;border-radius:999px;border:1px solid var(--border);background:var(--card);color:var(--ink);box-shadow:var(--shadow-lg);cursor:pointer}
.zh-fab:hover{background:var(--accent-soft)}
.zhkb{position:fixed;left:0;right:0;bottom:0;z-index:60;background:var(--sunk);border-top:1px solid var(--border);
  box-shadow:0 -10px 30px rgba(0,0,0,.18);padding:8px 8px calc(8px + env(safe-area-inset-bottom,0px));
  -webkit-user-select:none;user-select:none;-webkit-touch-callout:none;touch-action:manipulation;font-family:var(--ui)}
.zhkb[hidden]{display:none}
.zhkb>*{max-width:760px;margin-left:auto;margin-right:auto}
.zk-top{position:relative;min-height:52px;margin-bottom:6px;padding-right:34px}
.zk-comp{font-family:var(--mono);font-size:14px;font-weight:700;color:var(--accent-dark);min-height:18px;line-height:18px;padding:0 4px}
.zk-cands{display:flex;gap:6px;overflow-x:auto;overflow-y:hidden;scrollbar-width:thin;padding:2px 0 4px;-webkit-overflow-scrolling:touch}
.zk-cands.open{flex-wrap:wrap;overflow-x:hidden;overflow-y:auto;max-height:42vh}
.zk-cand{flex:0 0 auto;font:inherit;font-family:var(--zh);font-size:20px;line-height:1;min-width:40px;height:38px;padding:0 12px;border-radius:10px;
  border:1px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;display:inline-flex;align-items:center;gap:5px;justify-content:center}
.zk-cand small{font-family:var(--ui);font-size:10px;color:var(--faint);font-weight:700}
.zk-cand:hover,.zk-cand:active{background:var(--accent-soft);border-color:var(--accent)}
.zk-cand.tone{font-family:var(--ui);font-size:20px;font-weight:700;color:var(--accent-dark)}
.zk-tones{display:flex;gap:6px;flex-wrap:wrap;padding:2px 0}
.zk-more{position:absolute;right:0;top:0;width:30px;height:38px;border:1px solid var(--border);border-radius:10px;background:var(--card);color:var(--ink);font:inherit;cursor:pointer}
.zk-hint{font-size:13px;color:var(--muted);line-height:1.4;padding:6px 4px;white-space:normal}
.zk-hint.bad{color:var(--bad)}
.zk-keys{display:grid;gap:6px}
.zk-row{display:flex;gap:5px;justify-content:center}
.zk-row.pad{padding:0 4.5%}
.zk-k{flex:1 1 0;min-width:0;height:42px;padding:0;font:inherit;font-size:17px;font-weight:600;border-radius:9px;border:1px solid var(--border);
  background:var(--card);color:var(--ink);cursor:pointer;box-shadow:0 1px 0 var(--border);touch-action:manipulation}
.zk-k:active{background:var(--accent-soft);transform:translateY(1px)}
.zk-k.fn{background:var(--sunk);font-size:14px;flex:1.35 1 0}
.zk-k.wide{flex:1.6 1 0}
.zk-k.on{background:var(--accent);color:var(--on-accent);border-color:transparent}
.zk-k.dim{opacity:.45}
.zk-k.vow{background:var(--accent-soft);color:var(--accent-dark)}
.zk-k.space{flex:4.5 1 0;font-size:13px;color:var(--muted)}
.zk-k.enter{background:var(--accent);color:var(--on-accent);border-color:transparent;flex:1.6 1 0}
.zk-bottom .zk-k{height:44px}
@media (max-width:560px){
  .zk-k{height:40px;font-size:16px;border-radius:8px}.zk-row{gap:4px}.zk-cand{height:36px;font-size:19px}
  .zk-k.fn{font-size:13px}
}
@media print{.zhkb,.zh-fab{display:none!important}}

/* ===== Luyện nói AI (speak.js) ===== */
.spk-about{margin-top:10px;font-size:13.5px;color:var(--muted)}
.spk-about summary{cursor:pointer;font-weight:600;color:var(--ink)}
.spk-about ul{margin:8px 0 0;padding-left:20px;display:grid;gap:4px}
.spk-stage{text-align:center}
.spk-ref{font-size:22px;line-height:1.6;font-weight:600;margin:4px 0 6px;overflow-wrap:anywhere}
.spk-ref.zh{font-family:var(--zh);font-size:30px;line-height:1.5;letter-spacing:.04em}
.spk-py{font-size:15px;color:var(--accent-dark);font-weight:600;margin-bottom:6px}
.spk-ctrl{justify-content:center}
.spk-rec{font:inherit;font-size:16px;font-weight:700;padding:13px 24px;border-radius:999px;border:0;background:var(--accent);color:var(--on-accent);cursor:pointer;
  box-shadow:var(--shadow);min-height:48px}
.spk-rec:hover{background:var(--accent-dark)}
.spk-rec.on{background:var(--bad);color:#fff;animation:spkpulse 1.2s ease-in-out infinite}
@keyframes spkpulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--bad) 50%,transparent)}70%{box-shadow:0 0 0 14px transparent}100%{box-shadow:0 0 0 0 transparent}}
@media (prefers-reduced-motion:reduce){.spk-rec.on{animation:none}.spk-dots i{animation:none}}
.spk-status{min-height:22px;margin-top:10px;font-size:13.5px;color:var(--muted)}
.spk-status.bad{color:var(--bad);font-weight:600}
.spk-live-wrap{margin-top:8px;text-align:left}
.spk-live{margin-top:4px;min-height:48px;padding:10px 12px;border-radius:12px;background:var(--sunk);border:1px dashed var(--border);font-size:16px;overflow-wrap:anywhere}
.spk-custom{width:100%;box-sizing:border-box;font:inherit;font-size:16px;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--card);color:var(--ink);resize:vertical}
.spk-custom[lang="zh-CN"]{font-family:var(--zh);font-size:20px}
.spk-sep{border:0;border-top:1px solid var(--border);margin:16px 0}
.spk-res{text-align:left}
.spk-top{display:flex;gap:16px;align-items:center}
.spk-ring{--p:0;flex:0 0 auto;width:96px;height:96px;border-radius:50%;display:grid;place-content:center;text-align:center;line-height:1.1;position:relative;
  background:conic-gradient(var(--accent) calc(var(--p)*1%),var(--sunk) 0)}
.spk-ring::before{content:"";position:absolute;inset:9px;border-radius:50%;background:var(--card)}
.spk-ring>*{position:relative}
.spk-ring b{font-size:30px;font-variant-numeric:tabular-nums}
.spk-ring small{font-size:11px;color:var(--muted)}
.spk-band{font-size:19px;font-weight:800;color:var(--accent-dark)}
.spk-h{font-size:15px;margin:20px 0 8px}
.spk-diff{font-size:20px;line-height:2;overflow-wrap:anywhere}
.spk-diff.zh{font-family:var(--zh);font-size:26px;line-height:1.9}
.spk-t{display:inline-block;padding:0 4px;margin:1px 1px;border-radius:6px}
.spk-t.ok{background:var(--ok-soft);color:var(--ok)}
.spk-t.warn{background:var(--warn-soft);color:var(--warn)}
.spk-t.bad{background:var(--bad-soft);color:var(--bad)}
.spk-t.miss{background:transparent;color:var(--faint);border:1px dashed var(--faint)}
.spk-t.ins{background:transparent;color:var(--bad)}
.spk-t small{display:block;font-size:11px;line-height:1.1;font-weight:600}
.spk-legend{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}
.spk-legend .spk-t{font-size:12px;line-height:1.5;padding:1px 7px}
.spk-lines{margin:8px 0 0;padding-left:20px;font-size:13.5px;display:grid;gap:3px}
.spk-wait{display:flex;flex-wrap:wrap;align-items:center;gap:8px;color:var(--muted)}
.spk-dots{display:inline-flex;gap:4px}
.spk-dots i{width:7px;height:7px;border-radius:50%;background:var(--accent);animation:spkdot 1s ease-in-out infinite}
.spk-dots i:nth-child(2){animation-delay:.15s}.spk-dots i:nth-child(3){animation-delay:.3s}
@keyframes spkdot{0%,80%,100%{opacity:.25}40%{opacity:1}}
.spk-ai p{margin:0 0 10px}
.spk-ai ul{margin:4px 0 10px;padding-left:20px}
.spk-good{padding:10px 14px;border-radius:12px;background:var(--ok-soft);margin-bottom:10px}
.spk-iss{padding:10px 14px;border-radius:12px;background:var(--warn-soft);margin-bottom:10px}
.spk-issue{padding:8px 0;border-top:1px solid var(--border)}
.spk-iss b+.spk-issue{border-top:0}
.spk-u{font-family:var(--zh);font-weight:700;font-size:17px;background:var(--card);border:1px solid var(--border);border-radius:6px;padding:0 6px}
.spk-tip{color:var(--muted);font-size:13.5px;margin-top:2px}
.spk-limit{margin-top:14px}
.spk-items{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:8px}
.spk-item{font:inherit;text-align:left;display:flex;justify-content:space-between;gap:8px;align-items:center;padding:10px 12px;border-radius:12px;
  border:1px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer}
.spk-item:hover{background:var(--accent-soft)}
.spk-item.cur{border-color:var(--accent);box-shadow:0 0 0 2px color-mix(in srgb,var(--accent) 30%,transparent)}
.spk-itx{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;min-width:0}
.spk-badge{flex:0 0 auto;font-size:12px;font-weight:700;color:var(--ok);background:var(--ok-soft);border-radius:999px;padding:1px 8px}
.spk-badge[hidden]{display:none}
@media (max-width:560px){
  .spk-ref.zh{font-size:26px}.spk-ring{width:80px;height:80px}.spk-ring b{font-size:25px}.spk-top{gap:12px}.spk-band{font-size:17px}
}

/* ===== 🎓 Bài làm chuyên nghiệp (SSA101) ===== */
.pro-intro{background:linear-gradient(135deg,var(--accent-soft),var(--card) 70%)}
.pro-stats{margin-top:14px}
.pcard{background:var(--card);border:1px solid var(--border);border-left:5px solid var(--accent);border-radius:16px;padding:18px 20px;margin-top:14px;box-shadow:var(--shadow)}
.pcard.s-dup{border-left-color:var(--faint)}
.pcard.s-part,.pcard.s-amb{border-left-color:var(--warn)}
.pcard.s-cut{border-left-color:var(--bad)}
.pcard .qmeta{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.pcard .qtext{font-size:16px;line-height:1.6;margin:10px 0 12px}
.pst{background:var(--accent-soft);color:var(--accent-dark);font-weight:700}
.pdup{background:var(--sunk);color:var(--muted);font-weight:700}
.plink{background:var(--ok-soft);color:var(--ok);font-weight:700}
.popts{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.popt{display:flex;gap:12px;align-items:flex-start;padding:10px 12px;border-radius:12px;border:1px solid var(--border);background:var(--card)}
.popt .key{flex:none;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;font-weight:800;font-size:13px;background:var(--sunk);color:var(--muted)}
.popt .ptx{min-width:0;overflow-wrap:anywhere;line-height:1.55}
.popt.ok{border-color:var(--ok);background:var(--ok-soft)}
.popt.ok .key{background:var(--ok);color:#fff}
.popt.no .key{background:var(--bad-soft);color:var(--bad)}
.popt.mid .key{background:var(--warn-soft);color:var(--warn)}
.pk-ok{color:var(--ok);font-size:12px;margin-left:6px;white-space:nowrap}
.pnote{margin-top:4px;font-size:13.5px;color:var(--muted);line-height:1.5}
.psol{margin-top:14px;border:1px solid var(--border);border-radius:14px;overflow:hidden;background:var(--sunk)}
.prow{display:grid;grid-template-columns:120px 1fr;gap:12px;padding:11px 14px;border-top:1px solid var(--border);line-height:1.6}
.prow:first-child{border-top:0}
.prow .pl{font-weight:800;font-size:12.5px;letter-spacing:.04em;text-transform:uppercase;color:var(--accent-dark);padding-top:2px}
.prow .pv{min-width:0;overflow-wrap:anywhere}
.conf{display:inline-block;font-weight:800;font-size:12.5px;padding:2px 10px;border-radius:999px;margin-right:6px}
.conf.c-C{background:var(--ok-soft);color:var(--ok)}
.conf.c-T{background:var(--warn-soft);color:var(--warn)}
.conf.c-Th{background:var(--bad-soft);color:var(--bad)}
.ptry{margin-top:10px}
@media (max-width:560px){
  .prow{grid-template-columns:1fr;gap:2px}
  .pcard{padding:16px 14px}
}

.chip[aria-pressed="true"] .muted{color:inherit;opacity:.85}

/* ==========================================================================
   OCEAN LUXE – lớp giao diện mới (13/10/2026). Nằm cuối file nên ghi đè các quy tắc cũ ở trên.
   Ý tưởng: nền xanh nước biển sáng, mực navy, đường kẻ vàng champagne; chữ tiêu đề dùng serif Playfair Display,
   chữ nội dung Be Vietnam Pro. Mỗi môn một màu nhấn cùng độ bão hoà. Mọi màu lấy từ token ở đầu file.
   ========================================================================== */
:root{
  --display:"Playfair Display","Be Vietnam Pro",Georgia,"Times New Roman",serif;
  --hero-gold:#EBD79B;
  --wave:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 120' preserveAspectRatio='none'%3E%3Cpath d='M0 62C150 22 300 102 450 62S750 22 900 62s200 40 300-10V120H0Z' fill='%23ffffff' fill-opacity='.10'/%3E%3Cpath d='M0 88C200 56 350 118 550 88s350-34 650 4V120H0Z' fill='%23ffffff' fill-opacity='.09'/%3E%3C/svg%3E");
}
.s-chn{--accent:var(--chn);--accent-dark:var(--chn-d);--accent-soft:var(--chn-s);--hero-a:var(--chn-1);--hero-b:var(--chn-2)}
.s-eng{--accent:var(--eng);--accent-dark:var(--eng-d);--accent-soft:var(--eng-s);--hero-a:var(--eng-1);--hero-b:var(--eng-2)}
.s-ssa{--accent:var(--ssa);--accent-dark:var(--ssa-d);--accent-soft:var(--ssa-s);--hero-a:var(--ssa-1);--hero-b:var(--ssa-2)}
.s-enp{--accent:var(--enp);--accent-dark:var(--enp-d);--accent-soft:var(--enp-s);--hero-a:var(--enp-1);--hero-b:var(--enp-2)}
.s-ecr{--accent:var(--ecr);--accent-dark:var(--ecr-d);--accent-soft:var(--ecr-s);--hero-a:var(--ecr-1);--hero-b:var(--ecr-2)}
[data-subject="chn"]{--accent:var(--chn);--accent-dark:var(--chn-d);--accent-soft:var(--chn-s);--hero-a:var(--chn-1);--hero-b:var(--chn-2)}
[data-subject="eng"]{--accent:var(--eng);--accent-dark:var(--eng-d);--accent-soft:var(--eng-s);--hero-a:var(--eng-1);--hero-b:var(--eng-2)}
[data-subject="ssa"]{--accent:var(--ssa);--accent-dark:var(--ssa-d);--accent-soft:var(--ssa-s);--hero-a:var(--ssa-1);--hero-b:var(--ssa-2)}
[data-subject="enp"]{--accent:var(--enp);--accent-dark:var(--enp-d);--accent-soft:var(--enp-s);--hero-a:var(--enp-1);--hero-b:var(--enp-2);
  --ui:"Be Vietnam Pro","Noto Sans",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
[data-subject="ecr"]{--accent:var(--ecr);--accent-dark:var(--ecr-d);--accent-soft:var(--ecr-s);--hero-a:var(--ecr-1);--hero-b:var(--ecr-2)}

body{font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;
  background:
    radial-gradient(1100px 520px at 90% -8%,color-mix(in srgb,var(--sky) 28%,transparent),transparent 62%),
    radial-gradient(900px 560px at -8% 4%,color-mix(in srgb,var(--aqua) 15%,transparent),transparent 62%),
    var(--bg)}
.wrap{width:min(1180px,100%);padding-block:18px 40px}
::selection{background:color-mix(in srgb,var(--accent) 28%,transparent)}
:focus-visible{outline:3px solid color-mix(in srgb,var(--accent) 65%,transparent);outline-offset:2px}

/* ---- tiêu đề ---- */
.section-title,.th-title,.subj h3,.toc-sec h3,.oq-text h3{font-family:var(--display);letter-spacing:-.005em}
.section-title{font-weight:700;font-size:clamp(23px,3vw,30px);line-height:1.2;margin:42px 0 8px;color:var(--espresso)}
.wrap>.section-title,#panel>.section-title{display:flex;align-items:center;gap:16px}
.wrap>.section-title:after,#panel>.section-title:after{content:"";height:1px;flex:1;min-width:24px;background:linear-gradient(90deg,var(--gold),transparent)}
.section-sub{font-size:15.5px;line-height:1.7}
.big{font-family:var(--display)}

/* ---- thẻ, nút, chip ---- */
.card,.stat,.qcard,.subj,.pcard{border-radius:22px;border-color:var(--border);box-shadow:var(--shadow)}
.stat{border-radius:18px}
.stat .v{font-family:var(--display);font-size:30px}
.note{border-radius:18px;background:var(--accent-soft);border-color:color-mix(in srgb,var(--accent) 22%,var(--border))}
.btn{border-radius:13px;padding:12px 19px;font-size:14.5px;letter-spacing:.005em;
  background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 80%,#fff),var(--accent));
  box-shadow:0 8px 18px color-mix(in srgb,var(--accent) 26%,transparent),inset 0 1px 0 rgba(255,255,255,.28)}
.btn:hover{background:linear-gradient(180deg,var(--accent),var(--accent-dark));transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn.sec{background:var(--card);color:var(--accent-dark);border:1px solid var(--border);box-shadow:none}
.btn.sec:hover{background:var(--accent-soft)}
.btn.sm{padding:8px 13px;font-size:13.5px;border-radius:11px}
.chip{border-radius:999px;padding:8px 14px;font-size:13.5px;background:var(--card);border-color:var(--border)}
.chip:hover{background:var(--accent-soft)}
.chip[aria-pressed="true"]{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 82%,#fff),var(--accent));color:var(--on-accent);box-shadow:0 6px 14px color-mix(in srgb,var(--accent) 24%,transparent)}
.pill{background:var(--card);color:var(--accent-dark);border-color:var(--border);box-shadow:0 4px 12px rgba(8,52,102,.06)}
.pill:first-child{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 80%,#fff),var(--accent));color:var(--on-accent);border-color:transparent}
.pill:hover{background:var(--accent-soft)}
.pill:first-child:hover{background:var(--accent-dark)}
.lv,.tag{font-weight:700}
input[type=search],select{border-radius:12px;padding:11px 13px;border-color:var(--border)}
input[type=search]:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 25%,transparent)}

/* ---- hero ---- */
.hero{border-radius:30px;padding:40px 40px 78px;
  background:linear-gradient(125deg,var(--hero-a) 0%,var(--hero-b) 66%,color-mix(in srgb,var(--hero-b) 62%,var(--sky)) 135%);
  box-shadow:var(--shadow-lg),inset 0 0 0 1px rgba(255,255,255,.10),inset 0 1px 0 rgba(255,255,255,.24)}
.hero:before{content:"";position:absolute;left:0;right:0;bottom:0;height:64px;background:var(--wave) center bottom/100% 100% no-repeat;pointer-events:none}
.hero:after{width:320px;height:320px;right:-90px;top:-130px;background:none;border:1px solid color-mix(in srgb,var(--hero-gold) 40%,transparent);box-shadow:0 0 0 26px rgba(255,255,255,.035),0 0 0 27px color-mix(in srgb,var(--hero-gold) 18%,transparent)}
.hero>*{position:relative;z-index:1}
.hero .brand{color:var(--hero-gold);font-size:12px;letter-spacing:.2em;opacity:1;display:flex;align-items:center;gap:12px}
.hero .brand:before{content:"";width:34px;height:1px;background:var(--hero-gold)}
.hero h1{font-family:var(--display);font-weight:700;font-size:clamp(29px,4.8vw,46px);line-height:1.12;margin:12px 0 14px;letter-spacing:-.01em}
.hero h1 em{font-style:italic;font-weight:600;color:var(--hero-gold)}
.hero p{font-size:15.5px;opacity:.94;max-width:70ch}
.badges{margin-top:20px}
.badges>span{padding:7px 13px;border-radius:999px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.16);font-size:12.5px;backdrop-filter:blur(2px)}
.hero .glyph{bottom:22px;right:34px;font-family:var(--display);opacity:.12}

/* ---- thanh tab ---- */
.tabs{margin:24px 0 20px;padding:8px;gap:6px;border-radius:20px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.tab{background:transparent;color:var(--muted);opacity:1;border-radius:13px;padding:11px 15px;font-weight:600;transition:background .15s,color .15s}
.tab:hover{background:var(--accent-soft);color:var(--accent-dark)}
.tab[aria-selected="true"]{background:linear-gradient(180deg,color-mix(in srgb,var(--accent) 80%,#fff),var(--accent));color:var(--on-accent);box-shadow:0 8px 18px color-mix(in srgb,var(--accent) 30%,transparent)}
.tab[aria-selected="true"]:hover{color:var(--on-accent)}

/* ---- footer ---- */
footer.foot{position:relative;overflow:hidden;margin:40px 0 10px;padding:30px 18px 34px;border-radius:26px;
  background:linear-gradient(125deg,var(--hero-a),var(--hero-b));box-shadow:var(--shadow-lg)}
footer.foot:before{content:"";position:absolute;left:0;right:0;bottom:0;height:46px;background:var(--wave) center bottom/100% 100% no-repeat;pointer-events:none}
footer.foot:after{content:"";display:block;width:60px;height:2px;margin:12px auto 0;background:var(--hero-gold)}
footer.foot p{position:relative;z-index:1;font-size:14px}
footer.foot p:first-child{font-family:var(--display);font-size:18px}

/* ---- 1. CÂU HỎI TO, RÕ ---- */
.qcard{position:relative;overflow:hidden;padding:clamp(18px,3vw,32px)}
.qcard:before{content:"";position:absolute;left:0;right:0;top:0;height:6px;background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 35%,var(--sky)))}
.qmeta{font-size:13.5px;margin-bottom:14px;gap:8px}
.qmeta .num{font-weight:800;color:var(--accent-dark);background:var(--accent-soft);padding:3px 11px;border-radius:999px}
.speak{padding:6px 13px;font-size:14px;font-weight:700;border-radius:999px}
.qcard .qtext{font-size:clamp(21px,2.7vw,27px);line-height:1.55;font-weight:600;letter-spacing:-.003em;color:var(--ink);margin:4px 0 22px;padding:18px 22px;
  background:var(--sunk);border-radius:18px;border-left:6px solid var(--accent)}
[data-subject="chn"] .qcard .qtext{font-size:clamp(27px,3.4vw,34px);line-height:1.6}
.qcard .qtext u.seg{background:color-mix(in srgb,var(--accent) 16%,transparent);border-bottom-width:3px;border-radius:4px;padding:0 3px}
.qimg{max-width:min(100%,520px);border-radius:16px}
.opts{gap:12px}
.opt{font-size:clamp(18px,2.2vw,21px);line-height:1.5;font-weight:500;padding:15px 18px;min-height:62px;align-items:center;border-width:2px;border-radius:16px;gap:14px;transition:border-color .12s,background .12s,transform .12s}
[data-subject="chn"] .opt{font-size:clamp(23px,2.8vw,27px)}
.opt:hover:not(:disabled){transform:translateX(3px);border-color:var(--accent);background:var(--accent-soft)}
.opt .key{width:40px;height:40px;border-radius:12px;font-size:17px;background:var(--sunk);color:var(--accent-dark)}
.opt.right{border-color:var(--ok);background:var(--ok-soft);opacity:1}
.opt.wrong{border-color:var(--bad);background:var(--bad-soft)}
.lopts .opt{min-height:50px;font-size:17px}
[data-subject="chn"] .lopts .opt{font-size:19px}
.explain{margin-top:18px;padding:18px 22px;font-size:17px;line-height:1.75;border-radius:16px;border:1px solid var(--border);background:var(--sunk);border-left:6px solid var(--accent)}
.explain b.ok,.explain b.bad{font-size:19px}
.src{font-size:13px;margin-top:12px}
.prog{font-size:14.5px;font-weight:600}
.prog .bar{height:10px}
.bar{height:9px}
.bar>i{background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 45%,var(--sky)))}
.navgrid{grid-template-columns:repeat(auto-fill,minmax(44px,1fr));gap:8px}
.navgrid button{padding:10px 0;font-size:14px;font-weight:700;border-radius:11px}
.timer{font-family:var(--display);font-size:24px}
.list .qtext{font-size:17px}
[data-subject="chn"] .list .qtext{font-size:20px}
@media (max-width:600px){
  .hero{padding:28px 22px 66px;border-radius:24px}
  .qcard{padding:16px 14px}
  .qcard .qtext{padding:14px 15px;font-size:20px;border-left-width:5px}
  [data-subject="chn"] .qcard .qtext{font-size:25px}
  .opt{padding:13px 13px;min-height:58px;font-size:17.5px}
  [data-subject="chn"] .opt{font-size:22px}
  .opt .key{width:36px;height:36px}
}

/* ---- 2. MỤC LỤC xanh nước biển ---- */
.toc-panel{padding:18px;border-radius:32px;border:1px solid color-mix(in srgb,var(--sky) 40%,var(--border));
  background:linear-gradient(180deg,color-mix(in srgb,var(--sky) 30%,var(--bg)) 0%,color-mix(in srgb,var(--sky) 14%,var(--bg)) 55%,var(--bg) 100%)}
.toc-head{position:relative;overflow:hidden;border:0;border-radius:26px;padding:28px 28px 30px;color:#fff;
  background:linear-gradient(125deg,var(--sea-a) 0%,var(--sea-b) 62%,var(--sea-c) 140%);box-shadow:var(--shadow-lg),inset 0 1px 0 rgba(255,255,255,.22)}
.toc-head:before{content:"";position:absolute;left:0;right:0;bottom:0;height:56px;background:var(--wave) center bottom/100% 100% no-repeat;pointer-events:none}
.toc-head>*{position:relative}
.toc-head .section-title{color:#fff;font-size:clamp(26px,3.6vw,34px);margin:0 0 8px}
.toc-head .muted{color:rgba(255,255,255,.9);margin:0 0 16px;max-width:75ch;font-size:15px}
.toc-head .muted b{color:var(--hero-gold)}
.toc-head input[type=search]{background:#fff;color:#0B2542;border:0;font-size:16px;padding:14px 18px;border-radius:16px;box-shadow:0 10px 24px rgba(0,0,0,.20)}
.toc-head input[type=search]::placeholder{color:#5E7893}
.toc-jump{gap:8px;padding-bottom:14px}
.toc-jump a{color:#fff;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.26);padding:8px 14px;font-size:13.5px;font-weight:700}
.toc-jump a:hover{background:#fff;color:#084A92}
.toc-sec{padding:0;overflow:hidden;border-radius:24px;border:1px solid color-mix(in srgb,var(--sky) 35%,var(--border));background:var(--card);box-shadow:var(--shadow)}
.toc-sec h3{margin:0;padding:17px 24px;font-size:clamp(19px,2.4vw,23px);color:var(--espresso);
  background:linear-gradient(90deg,color-mix(in srgb,var(--sky) 26%,var(--card)),var(--card) 85%);border-bottom:1px solid var(--border);position:relative}
.toc-sec h3:before{content:"";position:absolute;left:0;top:0;bottom:0;width:6px;background:linear-gradient(180deg,var(--sea-c),var(--sea-b))}
.toc-sec h3 .muted{font-family:var(--ui);font-size:13px;font-weight:500}
.toc-row{padding:13px 24px;border-top:1px solid var(--border);transition:background .12s}
.toc-row:hover{background:color-mix(in srgb,var(--sky) 11%,var(--card))}
.toc-row:first-of-type{border-top:0}
.toc-t .tt{font-size:16px;font-weight:600}
.toc-sec>.chips,.toc-sec>p,.toc-sec>.toc-hits{margin:0;padding:18px 24px}
.toc-sec>.toc-hits{padding-left:46px}
.toc-sec .navgrid button.r{background:var(--ok-soft);border-color:var(--ok)}
.toc-qs summary{font-size:13.5px;color:var(--ocean-d)}
.toc-fab{background:linear-gradient(135deg,var(--sea-b),var(--sea-a));color:#fff;border:1px solid color-mix(in srgb,var(--hero-gold) 55%,transparent);padding:13px 19px;box-shadow:0 14px 30px rgba(6,38,74,.40)}
.toc-fab:hover{background:linear-gradient(135deg,var(--sea-c),var(--sea-b))}
@media (max-width:600px){
  .toc-panel{padding:10px;border-radius:24px}
  .toc-head{padding:22px 18px 26px;border-radius:20px}
  .toc-sec h3{padding:15px 16px}
  .toc-row{padding:12px 16px}
  .toc-sec>.chips,.toc-sec>p{padding:14px 16px}
}

/* ---- 3. TRÒ CHƠI ---- */
.gm-top{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:14px}
.gm-hub{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px}
.gm-card{position:relative;display:flex;flex-direction:column;gap:10px;text-align:left;font:inherit;color:var(--ink);padding:22px;border-radius:24px;
  border:1px solid var(--border);background:var(--card);box-shadow:var(--shadow);cursor:pointer;transition:transform .15s,box-shadow .15s,border-color .15s}
.gm-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--accent)}
.gm-ico{width:60px;height:60px;border-radius:19px;display:grid;place-items:center;font-size:32px;line-height:1;
  background:linear-gradient(135deg,var(--accent-soft),color-mix(in srgb,var(--sky) 34%,var(--card)));border:1px solid color-mix(in srgb,var(--accent) 20%,var(--border))}
.gm-card h3{font-family:var(--display);font-size:22px;line-height:1.2;margin:2px 0 0;color:var(--espresso)}
.gm-card .gm-tag{margin:0;color:var(--accent-dark);font-weight:700;font-size:13.5px}
.gm-card p{margin:0;color:var(--muted);font-size:15px;flex:1}
.gm-card .gm-rec{font-size:13.5px;font-weight:700;color:var(--espresso);padding-top:10px;border-top:1px dashed var(--border)}
.gm-new{position:absolute;top:16px;right:16px;font-size:11px;font-weight:800;letter-spacing:.08em;background:var(--gold);color:#3B2A00;border-radius:999px;padding:4px 10px}
.gm-intro{display:grid;gap:18px;padding:clamp(20px,3vw,32px)}
.gm-head{display:flex;gap:18px;align-items:center}
.gm-head h2{font-family:var(--display);font-size:clamp(26px,3.4vw,34px);line-height:1.15;margin:0;color:var(--espresso)}
.gm-head p{margin:4px 0 0;color:var(--muted)}
.gm-box{padding:18px 20px;border-radius:18px;background:var(--sunk);border:1px solid var(--border)}
.gm-box h3{margin:0 0 12px;font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-dark)}
.gm-how{list-style:none;margin:0;padding:0;display:grid;gap:12px;counter-reset:gm}
.gm-how li{counter-increment:gm;display:flex;gap:14px;align-items:flex-start;font-size:17px;line-height:1.55}
.gm-how li:before{content:counter(gm);flex:none;width:30px;height:30px;border-radius:50%;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;font-weight:800;font-size:14px;margin-top:1px}
.gm-how b{color:var(--accent-dark)}
.gm-opts{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.gm-start{font-size:19px;padding:16px 32px;border-radius:16px}
.gm-hud{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
.hud{flex:1 1 110px;min-width:0;padding:10px 16px;border-radius:16px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.hud small{display:block;font-size:11.5px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.hud b{display:block;font-family:var(--display);font-size:28px;line-height:1.2;font-variant-numeric:tabular-nums;color:var(--espresso)}
.hud.warn b{color:var(--bad)}
.hud.live{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 22%,transparent)}
.gm-bar{height:12px;border-radius:999px;background:var(--sunk);overflow:hidden;margin-bottom:14px}
.gm-bar>i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--accent),var(--sky));transition:width .25s linear}
.gm-msg{margin-top:14px;padding:14px 18px;border-radius:16px;font-size:17px;font-weight:600;background:var(--accent-soft);border:1px solid color-mix(in srgb,var(--accent) 25%,var(--border))}
.gm-msg.ok{background:var(--ok-soft);border-color:var(--ok);color:var(--ok)}
.gm-msg.bad{background:var(--bad-soft);border-color:var(--bad);color:var(--bad)}
.gm-end{text-align:center;display:grid;gap:12px;justify-items:center;padding:clamp(24px,4vw,40px)}
.gm-end .big{font-size:clamp(46px,9vw,72px)}
.gm-end h2{font-family:var(--display);margin:0;font-size:28px;color:var(--espresso)}
/* ghép cặp */
.match{gap:18px}
.mcol{gap:12px}
.mcol-h{font-size:12.5px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-dark);padding:0 4px 2px}
.mitem{padding:15px 16px;font-size:clamp(16.5px,2vw,19px);line-height:1.5;border-radius:16px;border-width:2px;min-height:60px;display:flex;align-items:center;gap:12px}
.mitem .mk{flex:none;width:30px;height:30px;border-radius:9px;background:var(--sunk);color:var(--accent-dark);display:grid;place-items:center;font-weight:800;font-size:14px}
.mitem.sel{border-color:var(--accent);background:var(--accent-soft);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 22%,transparent)}
.mitem.done{opacity:1;border-color:var(--ok);background:var(--ok-soft)}
.mitem.done .mk{background:var(--ok);color:#fff}
/* leo tháp */
.floor{padding:7px 14px;font-size:14px;border-radius:10px}
.floor.cur{background:linear-gradient(90deg,var(--accent),color-mix(in srgb,var(--accent) 50%,var(--sky)))}
.lives{font-size:26px}
/* đúng / sai */
.tf-card{padding:clamp(18px,3vw,30px)}
.tf-q{font-size:clamp(21px,2.7vw,27px);font-weight:600;line-height:1.55;padding:18px 22px;background:var(--sunk);border-radius:18px;border-left:6px solid var(--accent);overflow-wrap:anywhere}
.tf-claim{margin-top:14px;padding:18px 22px;border-radius:18px;background:var(--gold-s);border:2px dashed var(--gold);overflow-wrap:anywhere}
.tf-claim small{display:block;font-size:12px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-d);margin-bottom:4px}
.tf-claim b{font-size:clamp(20px,2.5vw,25px);line-height:1.5;color:var(--ink)}
.tf-btns{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:18px}
.tf-btn{font:inherit;font-size:clamp(20px,2.6vw,26px);font-weight:800;padding:22px 12px;border-radius:20px;border:0;color:#fff;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px;transition:transform .12s,filter .12s;box-shadow:var(--shadow)}
.tf-btn small{font-size:12px;font-weight:600;opacity:.85}
.tf-btn:hover:not(:disabled){transform:translateY(-2px);filter:brightness(1.06)}
.tf-btn:disabled{opacity:.45;cursor:default}
.tf-yes{background:linear-gradient(180deg,#27A872,#17825A)}
.tf-no{background:linear-gradient(180deg,#E0524F,#B93431)}
/* ca-rô */
.ttt{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;width:min(100%,420px);margin:0 auto}
.tc{aspect-ratio:1;max-width:100%;font:inherit;font-size:clamp(46px,13vw,76px);font-weight:800;line-height:1;border-radius:20px;border:2px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer;display:grid;place-items:center;transition:transform .12s,background .12s}
.tc:hover:not(:disabled){background:var(--accent-soft);border-color:var(--accent);transform:scale(1.03)}
.tc.x{color:var(--ok);background:var(--ok-soft);border-color:var(--ok)}
.tc.o{color:var(--bad);background:var(--bad-soft);border-color:var(--bad)}
.tc.win{box-shadow:0 0 0 4px var(--gold)}
.tc:disabled{cursor:default}
.ttt-wrap{display:grid;grid-template-columns:minmax(0,420px) minmax(0,1fr);gap:22px;align-items:start}
@media (max-width:820px){.ttt-wrap{grid-template-columns:minmax(0,1fr)}}
/* đánh trùm */
.boss-arena{display:flex;align-items:center;gap:20px;padding:18px 22px;border-radius:22px;color:#fff;margin-bottom:14px;
  background:linear-gradient(125deg,var(--sea-a),var(--sea-b));box-shadow:var(--shadow-lg);position:relative;overflow:hidden}
.boss-arena:before{content:"";position:absolute;left:0;right:0;bottom:0;height:46px;background:var(--wave) center bottom/100% 100% no-repeat;pointer-events:none}
.boss-face{font-size:clamp(56px,9vw,84px);line-height:1;filter:drop-shadow(0 8px 12px rgba(0,0,0,.35));position:relative}
.boss-face.hit{animation:bosshit .45s}
@keyframes bosshit{20%{transform:translateX(-10px) rotate(-6deg)}50%{transform:translateX(10px) rotate(6deg)}80%{transform:translateX(-5px)}}
.boss-info{flex:1;min-width:0;position:relative}
.boss-info b{font-family:var(--display);font-size:20px}
.hp{height:18px;border-radius:999px;background:rgba(255,255,255,.22);overflow:hidden;margin:8px 0 4px}
.hp>i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#FF6B5E,#FFB347);transition:width .4s}
.boss-info small{opacity:.92}
.dmg{position:fixed;left:50%;top:38%;transform:translate(-50%,0);font-family:var(--display);font-size:40px;font-weight:800;color:#fff;
  text-shadow:0 3px 10px rgba(0,0,0,.5);pointer-events:none;animation:dmgup .9s forwards;z-index:70}
@keyframes dmgup{from{opacity:1;transform:translate(-50%,0)}to{opacity:0;transform:translate(-50%,-70px)}}
/* vòng quay */
.wheel-wrap{position:relative;width:min(100%,360px);margin:0 auto}
.wheel-wrap svg{width:100%;height:auto;display:block;overflow:visible}
.wheel-rot{transform-origin:50% 50%;transition:transform 3.4s cubic-bezier(.12,.7,.1,1)}
.wheel-ptr{position:absolute;left:50%;top:-14px;transform:translateX(-50%);width:0;height:0;border-left:15px solid transparent;border-right:15px solid transparent;border-top:30px solid var(--gold-d);filter:drop-shadow(0 3px 3px rgba(0,0,0,.3));z-index:2}
.wsl{stroke:var(--card);stroke-width:3}
.wl1{fill:var(--lv1)} .wl2{fill:var(--lv2)} .wl3{fill:var(--lv3)} .wl4{fill:var(--lv4)} .wlb{fill:var(--gold)} .wlx{fill:var(--faint)}
.wtxt{font-family:"Be Vietnam Pro",sans-serif;font-size:13.5px;font-weight:800;fill:#fff;text-anchor:middle}
.wtxt.dk{fill:#3B2A00}
.wheel-hub{fill:var(--card);stroke:var(--gold);stroke-width:4}
.spin-row{display:flex;justify-content:center;margin-top:16px}
.wheel-grid{display:grid;grid-template-columns:minmax(0,380px) minmax(0,1fr);gap:22px;align-items:start}
@media (max-width:820px){.wheel-grid{grid-template-columns:minmax(0,1fr)}}
/* tốc độ */
.spd-flash{font-weight:800;color:var(--ok)}
/* thống kê, v.v. */
.tt-wrap{border-radius:18px}

/* ---- 4. TRANG CHỦ: THỜI KHOÁ BIỂU ---- */
.home-hero{padding-bottom:84px}
.hero-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px;align-items:end}
.clock{text-align:right;min-width:240px}
.clock-time{font-family:var(--display);font-size:clamp(46px,6.4vw,74px);font-weight:700;line-height:1;font-variant-numeric:tabular-nums;letter-spacing:.01em}
.clock-time i{font-style:normal;opacity:.55;animation:blink 1s steps(2,start) infinite}
@keyframes blink{to{opacity:.12}}
.clock-date{font-size:16px;margin-top:8px;opacity:.96}
.clock-wk{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end;margin-top:14px}
.mode{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:800;letter-spacing:.06em;text-transform:uppercase;padding:4px 11px 4px 9px;border-radius:999px;white-space:nowrap;line-height:1.3}
.mode:before{content:"";width:8px;height:8px;border-radius:50%;background:currentColor;flex:none}
.mode.on{background:var(--on-s);color:var(--on)}
.mode.off{background:var(--off-s);color:var(--off)}
.mode.off:before{border-radius:2px}
.hero .mode{background:rgba(255,255,255,.14);color:#fff;border:1px solid rgba(255,255,255,.25)}
.today{display:grid;grid-template-columns:auto minmax(0,1fr);gap:24px;align-items:start;padding:clamp(18px,3vw,28px)}
.datebox{width:118px;height:132px;border-radius:24px;background:linear-gradient(160deg,var(--sea-a),var(--sea-b));color:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center;
  line-height:1.05;box-shadow:var(--shadow-lg),inset 0 0 0 1px rgba(255,255,255,.12);position:relative;overflow:hidden}
.datebox:before{content:"";position:absolute;left:0;right:0;top:0;height:30px;background:rgba(255,255,255,.12)}
.datebox:after{content:"";position:absolute;left:18px;right:18px;top:30px;height:2px;background:var(--hero-gold)}
.datebox small{position:absolute;top:7px;font-size:11.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase}
.datebox b{font-family:var(--display);font-size:56px;font-weight:700;margin-top:30px}
.datebox span{font-size:13px;opacity:.92;margin-top:2px}
.today-h{margin:0 0 4px;font-family:var(--display);font-size:clamp(22px,2.8vw,28px);color:var(--espresso)}
.today-sub{margin:0 0 14px;color:var(--muted)}
.trow{display:grid;grid-template-columns:128px minmax(0,1fr) auto;gap:6px 16px;align-items:center;padding:14px 16px;border-radius:18px;border:1px solid var(--border);
  border-left:6px solid var(--accent);background:linear-gradient(90deg,color-mix(in srgb,var(--accent) 9%,var(--card)),var(--card) 60%)}
.trow+.trow{margin-top:10px}
.trow.live{box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 30%,transparent),var(--shadow)}
.trow.done{opacity:.62}
.trow .tm{font-weight:800;font-variant-numeric:tabular-nums;font-size:15px}
.trow .tm small{display:block;font-weight:600;color:var(--muted);font-size:12.5px}
.trow .nm b{font-size:17px;color:var(--accent-dark)}
.trow .nm span{display:block;font-size:14px;color:var(--muted)}
.trow .md{display:flex;flex-direction:column;align-items:flex-end;gap:6px}
.st{font-size:13px;font-weight:700;color:var(--muted)}
.st.live{color:var(--ok)}
.trow .go{grid-column:1/-1;display:flex;gap:8px;flex-wrap:wrap;margin-top:4px}
@media (max-width:760px){
  .hero-grid{grid-template-columns:1fr}.clock{text-align:left}.clock-wk{justify-content:flex-start}
  .today{grid-template-columns:1fr}.datebox{width:100%;height:auto;flex-direction:row;gap:14px;padding:12px 18px;justify-content:flex-start}
  .datebox:before,.datebox:after{display:none}.datebox small{position:static}.datebox b{margin-top:0;font-size:44px}
  .trow{grid-template-columns:1fr auto}.trow .md{align-items:flex-end}
  .trow .tm{grid-column:1/-1}
}
.wk-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:4px 0 14px}
.wk-bar .lbl{font-family:var(--display);font-size:20px;font-weight:700;color:var(--espresso);margin:0 4px}
.legend{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:center;font-size:14px;color:var(--muted);margin:0 0 14px}
.rule-note{margin:0 0 16px;padding:14px 18px;border-radius:16px;background:var(--gold-s);border:1px solid color-mix(in srgb,var(--gold) 50%,var(--border));color:var(--ink);font-size:15px;line-height:1.7}
.rule-note b{color:var(--gold-d)}
.rule-note button{font:inherit;font-weight:700;color:var(--gold-d);background:none;border:0;padding:0;text-decoration:underline;cursor:pointer}
table.tkb{border-collapse:separate;border-spacing:0;width:100%;table-layout:fixed;min-width:860px}
.tkb th,.tkb td{padding:9px;vertical-align:top;border-bottom:1px solid var(--border);border-right:1px solid var(--border)}
.tkb tr>*:last-child{border-right:0}
.tkb tbody tr:last-child>*{border-bottom:0}
.tkb thead th{background:linear-gradient(180deg,var(--sea-b),var(--sea-a));color:#fff;text-align:left;padding:13px 12px;font-size:15px;position:relative}
.tkb thead th small{display:block;font-weight:500;opacity:.88;font-size:13px}
.tkb thead th.now{background:linear-gradient(180deg,var(--sea-c),var(--sea-b))}
.tkb thead th.now:after{content:"";position:absolute;left:0;right:0;bottom:0;height:4px;background:var(--hero-gold)}
.tkb th.slot{background:var(--sunk);color:var(--muted);width:104px;font-weight:700;font-size:13px;text-align:left;position:sticky;left:0;z-index:1}
.tkb th.slot small{display:block;font-weight:500}
.tkb thead th.slot{background:linear-gradient(180deg,var(--sea-b),var(--sea-a));color:#fff;z-index:2}
.tkb td.today{background:color-mix(in srgb,var(--sky) 11%,var(--card))}
.tkb td{background:var(--card);height:132px}
.tkb td.today{background:color-mix(in srgb,var(--sky) 12%,var(--card))}
.tkb td.am{background:color-mix(in srgb,var(--sunk) 55%,var(--card))}
.cls{display:flex;flex-direction:column;gap:5px;height:100%;border-radius:14px;padding:10px 11px;text-decoration:none;color:var(--ink);border:1px solid color-mix(in srgb,var(--accent) 28%,var(--border));
  border-left:6px solid var(--accent);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 11%,var(--card)),var(--card));transition:transform .12s,box-shadow .12s}
a.cls:hover{transform:translateY(-2px);box-shadow:var(--shadow);background:linear-gradient(135deg,color-mix(in srgb,var(--accent) 17%,var(--card)),var(--card))}
.cls b{font-size:15px;color:var(--accent-dark);display:flex;align-items:center;justify-content:space-between;gap:6px}
.cls .cn{font-size:13px;color:var(--ink);line-height:1.35}
.cls .rm{font-size:12.5px;color:var(--muted)}
.cls .mode{align-self:flex-start;font-size:10.5px}
.cls.live{box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 35%,transparent)}
.cls .livetag{font-size:10px;font-weight:800;letter-spacing:.08em;color:var(--on-accent);background:var(--accent);border-radius:999px;padding:2px 8px}
.tkb .muted{color:var(--faint)}
.tt-hint{margin-top:8px}
.agenda{display:none}
.ag-day{padding:14px 16px 16px;border-radius:20px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.ag-day+.ag-day{margin-top:12px}
.ag-day.today{border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--sky) 40%,transparent),var(--shadow)}
.ag-day h4{margin:0 0 10px;font-family:var(--display);font-size:19px;color:var(--espresso);display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.ag-day h4 small{font-family:var(--ui);font-size:13px;font-weight:600;color:var(--muted)}
.ag-day .cls{margin-top:8px;height:auto}
.ag-t{font-size:13px;font-weight:700;color:var(--muted);font-variant-numeric:tabular-nums}
@media (max-width:760px){.tt-wrap,.tt-hint{display:none!important}.agenda{display:block}}

/* thẻ môn học */
.subj-grid{gap:20px}
.subj{padding:0;overflow:hidden;gap:0;background:var(--card)}
.subj:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.subj-top{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px 22px;color:#fff;position:relative;overflow:hidden;
  background:linear-gradient(120deg,var(--hero-a),var(--hero-b))}
.subj-top:after{content:"";position:absolute;left:0;right:0;bottom:0;height:26px;background:var(--wave) center bottom/100% 100% no-repeat;pointer-events:none}
.subj-top .code{font-size:13px;font-weight:800;letter-spacing:.16em;color:var(--hero-gold)}
.subj-top .glyph{font-family:var(--display);font-size:34px;font-weight:700;opacity:.9;line-height:1}
.subj-body{display:flex;flex-direction:column;gap:12px;padding:20px 22px 22px;flex:1}
.subj h3{font-size:23px;line-height:1.25;color:var(--espresso)}
.subj p{font-size:14.5px;line-height:1.65;color:var(--muted)}
.subj .sess{display:flex;flex-wrap:wrap;gap:8px}
.sess-p{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:600;padding:6px 11px;border-radius:12px;background:var(--sunk);color:var(--ink)}
.sess-p small{color:var(--muted);font-weight:500}
.subj .btn{width:auto}
.subj .row:last-child{margin-top:4px}

/* ✨ AI chấm câu viết / tự luận (dùng lại spk-ai, spk-ring… của phần Luyện nói) */
.ai-box:empty,.wai:empty{display:none}
.ai-box,.wai{margin-top:10px}
.ai-res{padding:14px 16px;border-radius:14px;background:var(--card);border:1px solid var(--border)}
.ai-head{display:flex;gap:14px;align-items:center;margin-bottom:10px}
.ai-stale{margin:0 0 10px;padding:8px 12px;border-radius:10px;background:var(--warn-soft);color:var(--warn);font-size:13.5px;font-weight:600}
.ai-err{margin:6px 0 0;color:var(--bad)}
.ai-pts{display:grid;gap:8px;margin:6px 0 12px}
.ai-pt{display:grid;grid-template-columns:22px minmax(0,1fr);gap:8px;align-items:start;padding:8px 10px;border-radius:10px;background:var(--sunk)}
.ai-pt .ai-ic{font-weight:800;line-height:1.5}
.ai-pt.ok .ai-ic{color:var(--ok)} .ai-pt.warn .ai-ic{color:var(--warn)} .ai-pt.bad .ai-ic{color:var(--bad)}
.ai-ptt{font-size:14px;font-weight:600;overflow-wrap:anywhere}
.ai-q{color:var(--bad);background:var(--bad-soft);border-radius:4px;padding:0 3px;text-decoration:line-through}
.ai-wr{margin-top:6px}
.ai-wr.ok{border-color:var(--ok)} .ai-wr.bad{border-color:var(--bad)}
.ai-wrh .ok{color:var(--ok);font-weight:800} .ai-wrh .bad{color:var(--bad);font-weight:800}
.ai-wr p{margin:6px 0}
.ai-fix{margin-top:4px;font-size:16px;overflow-wrap:anywhere}
.ai-fix .zh{font-size:19px}
@media (max-width:600px){.ai-head .spk-ring{width:72px;height:72px}.ai-head .spk-ring b{font-size:22px}}

/* ===== 15/10/2026: thanh đầu trang + thanh song ngữ, nhóm tab, bắt đầu nhanh, lời giải dịch ===== */
html{scroll-padding-top:76px}
.sbar{position:sticky;top:env(safe-area-inset-top,0px);z-index:50;background:color-mix(in srgb,var(--card) 94%,transparent);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
.sbar-in{width:min(1120px,100%);margin:0 auto;padding:8px max(16px,env(safe-area-inset-right,0px)) 8px max(16px,env(safe-area-inset-left,0px));display:flex;align-items:center;gap:10px}
.sb-home{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;background:var(--accent-soft);color:var(--accent-dark);border:1px solid var(--border);font-weight:700;font-size:13px;text-decoration:none;white-space:nowrap;flex:none}
.sb-home:hover{background:var(--card)}
.sb-courses{display:flex;gap:6px;min-width:0;overflow-x:auto;scrollbar-width:none;flex:1}
.sb-courses::-webkit-scrollbar{display:none}
.sb-courses a{padding:6px 11px;border-radius:999px;font-size:12.5px;font-weight:700;border:1px solid var(--border);color:var(--muted);background:var(--card);text-decoration:none;white-space:nowrap}
.sb-courses a:hover{color:var(--accent-dark);border-color:var(--accent)}
.sb-courses a[aria-current="page"]{background:var(--accent);color:var(--on-accent);border-color:transparent}
.sb-right{display:flex;align-items:center;gap:8px;flex:none}
.sb-theme{font:inherit;font-size:15px;line-height:1;width:34px;height:34px;border-radius:50%;border:1px solid var(--border);background:var(--card);cursor:pointer;color:var(--ink)}
.sb-theme:hover{border-color:var(--accent)}
.langbar{display:inline-flex;align-items:center;gap:2px;padding:3px;border-radius:999px;background:var(--sunk);border:1px solid var(--border);flex:none}
.langbar svg{width:15px;height:15px;margin:0 3px 0 8px;color:var(--muted);flex:none}
.langbar button{border:0;background:none;cursor:pointer;font:700 12.5px var(--ui);padding:5px 11px;border-radius:999px;color:var(--muted);letter-spacing:.02em;white-space:nowrap}
.langbar button:hover{color:var(--ink)}
.langbar button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
@media (max-width:760px){
  .sbar-in{flex-wrap:wrap}
  .sb-courses{order:3;flex:1 0 100%}
  .sb-right{margin-left:auto}
  .langbar svg{display:none}
  html{scroll-padding-top:104px}
}
/* hai thứ tiếng cạnh nhau (chữ tĩnh trong HTML: <span class="vi">/<span class="en">; chữ do app.js vẽ ra được i18n.js chèn .l-en) */
html[data-lang="bi"] :is(.sbar,.badges,.foot,.note summary,.tg-h) .vi + .en::before{content:" / "}
html[data-lang="bi"] .hero :is(h1,p) .en{display:block;margin-top:4px}
html[data-lang="bi"] .hero h1 .en{font-size:.6em;font-weight:600;opacity:.92}
html[data-lang="bi"] .hero p .en{opacity:.82}
html[data-lang="bi"] .brand .vi+.en::before{content:" / "}
.l-en{color:var(--muted);font-weight:500}
.l-en::before{content:" / "}
.l-en.blk{display:block;margin-top:2px;font-size:.92em}
.l-en.blk::before{content:none}
.hero .l-en,.foot .l-en,.btn .l-en,.tab[aria-selected="true"] .l-en,.th-item.cur .l-en{color:inherit;opacity:.82}
.tab .l-en,.btn .l-en,.chip .l-en,.tag .l-en,.opt .l-en{white-space:normal}
/* nhóm tab */
.tabs{display:grid;gap:0;padding:4px 12px}
.tg{display:grid;grid-template-columns:92px minmax(0,1fr);align-items:start;gap:8px;padding:8px 0}
.tg+.tg{border-top:1px dashed var(--border)}
.tg-h{font-size:11.5px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding-top:13px}
.tg-b{display:flex;flex-wrap:wrap;gap:6px}
.tabs{scroll-margin-top:72px}
@media (max-width:600px){
  .tabs{display:flex;align-items:center;gap:7px;padding:8px;scroll-margin-top:104px}
  .tg,.tg-b{display:contents}
  .tg-h{flex:none;padding:0 2px 0 8px;font-size:10px;writing-mode:horizontal-tb;color:var(--faint)}
  .tg:not(:first-child) .tg-h{border-left:1px solid var(--border);margin-left:4px}
}
/* bắt đầu nhanh */
.quick{margin-bottom:6px}
.qs-t{margin:0 0 12px!important;font-size:18px}
.qs-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.qs-steps li{display:flex;gap:11px;padding:12px;border-radius:14px;background:var(--sunk);border:1px solid var(--border)}
.qs-steps li>div{display:flex;flex-direction:column;gap:6px;align-items:flex-start;min-width:0}
.qs-steps .btn{margin-right:6px}
.qs-n{flex:none;width:28px;height:28px;border-radius:50%;background:var(--accent);color:var(--on-accent);display:grid;place-items:center;font-weight:800;font-size:14px}
@media (max-width:760px){.qs-steps{grid-template-columns:1fr}}
/* lời giải dịch theo yêu cầu */
.exp-xl{display:block;margin-top:6px}
.exp-xl[hidden]{display:none}
.exp-en{padding:8px 11px;border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:8px}
/* ghi chú nguồn câu hỏi: gấp lại cho gọn */
details.note>summary{cursor:pointer;font-weight:700;color:var(--accent-dark);list-style-position:inside}
details.note[open]>summary{margin-bottom:10px}
details.note p{margin:0 0 10px;line-height:1.65}
details.note .en{color:var(--muted)}
html[data-lang="en"] details.note .en{color:inherit}
.hero .brand .en,.hero .brand .vi{display:inline}

/* dịch câu hỏi theo yêu cầu */
.q-xl{margin:10px 0 0}
.q-tr{padding:10px 12px;border:1px dashed var(--line,#ccd);border-radius:10px;font-size:.95em;background:color-mix(in srgb,var(--accent,#4a6) 6%,transparent)}
.q-tr b{font-size:.75em;letter-spacing:.06em;margin-right:6px;opacity:.7}
.q-tr ul{list-style:none;margin:6px 0 0;padding:0}
.q-tr li{margin:2px 0}
.q-tr .key{display:inline-block;min-width:1.4em;font-weight:700;opacity:.7}
.toc-fab .l-en,.sbar .l-en,.pill .l-en,.tab[aria-selected="true"] .l-en{color:inherit;opacity:.85}

/* ---------- 📚 Từ vựng (ECR): khung Key Vocabulary của giáo trình ---------- */
.vc-tbl td{vertical-align:top}
.vc-w{white-space:nowrap}
.vc-w b{font-size:1.05em;color:var(--accent-dark)}
.vc-m .vi,.vc-m .en{display:block}
.vc-m .en{color:var(--muted);font-size:.92em;margin-top:2px}
html[data-lang="vi"] .vc-m .en,html[data-lang="en"] .vc-m .vi{display:none}
.vc-ex{font-style:italic;color:var(--muted);font-size:.9em;margin-top:4px}
.vc-k{width:1%;text-align:center}
.vc-k .chip{padding:5px 10px}
.vc-known .vc-w b{opacity:.55}
.vc-box{font-weight:600;color:var(--muted);font-size:.8em}
.vc-mc[data-reveal]{cursor:pointer}
.vc-mc.mask > *{filter:blur(7px);opacity:.55;user-select:none}
.vc-mc.mask{position:relative}
.vc-mc.mask::after{content:"👁";position:absolute;inset:0;display:flex;align-items:center;justify-content:center;font-size:18px}
.vc-card{text-align:center;padding:28px 18px;cursor:pointer;min-height:230px}
.vc-card .vc-m{margin-top:14px;font-size:1.05em}
.vc-card .vc-ex{margin-top:8px}
.vc-big{font-size:clamp(28px,7vw,44px);font-weight:800;color:var(--accent-dark);margin:12px 0 6px}
@media (max-width:640px){.vc-w{white-space:normal}.vc-tbl td{padding:8px 6px}}

/* ---------- 🌐 Quả cầu từ vựng (vocab_globe.js) ---------- */
.vg-stage{position:relative;border-radius:18px;overflow:hidden;background:radial-gradient(ellipse at 50% 38%,#0e3358 0%,#061a30 62%,#04101e 100%);border:1px solid var(--border)}
.vg-stage canvas{display:block;width:100%}
.vg-tip{position:absolute;max-width:min(300px,86%);padding:9px 12px;border-radius:10px;background:rgba(4,16,30,.94);color:#eaf4ff;border:1px solid rgba(255,255,255,.18);font-size:13px;line-height:1.4;pointer-events:none;z-index:2}
.vg-tip .tag{background:rgba(255,255,255,.14);color:#cfe3f8}
.vg-tip .muted{color:#9bb6d2}
.vg-tip .en{color:#b9d2ec;font-size:.92em}
.vg-tip .vi,.vg-tip .en{display:block}
html[data-lang="vi"] .vg-tip .en,html[data-lang="en"] .vg-tip .vi{display:none}
.vg-hint{position:absolute;left:0;right:0;bottom:8px;text-align:center;font-size:12px;color:#9bb6d2;pointer-events:none}
.vg-hint .vi,.vg-hint .en{display:inline}
html[data-lang="bi"] .vg-hint .vi + .en::before{content:" / "}
.vg-lead{margin:0 0 10px}
.vg-panel{margin-top:14px}
.vg-panel:empty{display:none}
.vg-ws .chip{padding:5px 11px}
.vg-det{margin-top:14px;padding-top:12px;border-top:1px solid var(--border)}
.vg-big{font-size:1.5em;color:var(--accent-dark)}
.vg-h{margin:26px 0 8px;font-size:1.1em}
.vg-pick{display:flex;flex-wrap:wrap;gap:8px 18px}
.vg-pc{display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.vg-pc b{font-size:12px;color:var(--muted);min-width:38px}
.vg-pc .chip{padding:5px 10px}
.vg-pairs{display:flex;flex-wrap:wrap;gap:10px}
.vg-pair{font:inherit;display:inline-flex;align-items:center;gap:8px;flex-wrap:wrap;padding:8px 12px;border-radius:12px;border:1px dashed var(--accent);background:var(--card);color:var(--ink);cursor:pointer;text-align:left}
.vg-pair i{font-style:normal;color:var(--accent)}
.vg-pair:hover{background:var(--accent-soft)}
.vg-co{margin-top:12px}
.vg-co ul{margin:6px 0 0;padding-left:20px}
.vg-co li{margin:3px 0}
.vg-co .vi,.vg-co .en{display:inline}
html[data-lang="bi"] .vg-co .vi + .en::before{content:" — "}
html[data-lang="vi"] .vg-co .en,html[data-lang="en"] .vg-co .vi{display:none}

/* ---------- 🌐 Bản đồ sao 5D = 12 cung hoàng đạo quanh hành tinh của môn (starmap.js + planet.js + zodiac-art.js) ----------
   Chữ song ngữ: <span class="vi"> rồi <span class="en">; html[data-lang] (mục "Song ngữ") ẩn bản không chọn. */
.kg .vi,.kg .en{display:inline}
html[data-lang="bi"] .kg .vi + .en::before{content:" / ";color:var(--faint)}
.kg-tip .vi,.kg-tip .en,.kg-dd .vi,.kg-dd .en,.kg-title .vi,.kg-title .en,.kg-dt .vi,.kg-dt .en,.sm-ct .vi,.sm-ct .en,.sm-cd .vi,.sm-cd .en{display:block}
html[data-lang="bi"] :is(.kg-tip,.kg-dd,.kg-title,.kg-dt,.sm-ct,.sm-cd) .vi + .en::before{content:none}
.kg-dt .en{font-family:var(--ui);font-size:.7em;font-weight:500;color:var(--muted)}
.kg-tip .en{color:#b9d2ec;font-size:.93em}
.kg-dd .en{color:var(--muted);font-size:.93em}
.kg-title .en{color:var(--muted);font-size:.8em;font-weight:500}
.kg-top{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin-bottom:12px}
.kg-q{flex:1 1 240px;min-width:0;max-width:380px}
.kg-leg{display:flex;flex-wrap:wrap;gap:8px}
.kg .chip,.kg-r{font:inherit;font-size:13.5px;border-radius:999px;padding:8px 14px;background:var(--card);border:1px solid var(--border);color:var(--ink);cursor:pointer;text-align:left}
.kg .chip:hover,.kg-r:hover{background:var(--accent-soft);border-color:var(--accent)}
.kg .chip[aria-pressed="true"]{background:linear-gradient(180deg,color-mix(in srgb,var(--c,var(--accent)) 80%,#fff),var(--c,var(--accent)));color:#fff;border-color:transparent;box-shadow:0 6px 14px color-mix(in srgb,var(--c,var(--accent)) 26%,transparent)}
.kg-set{display:inline-flex;align-items:center;gap:7px}
.kg-set i{width:11px;height:11px;border-radius:50%;background:hsl(var(--h),85%,62%);box-shadow:0 0 0 3px hsl(var(--h) 85% 62% / .25)}
.kg-res{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 12px;padding:10px;border-radius:16px;background:var(--sunk);border:1px solid var(--border)}
.kg-r{display:inline-flex;align-items:center;gap:8px}
.kg-stage{position:relative;border-radius:26px;overflow:hidden;background:radial-gradient(ellipse at 50% 42%,#12427a 0%,#08213e 55%,#030d19 100%);border:1px solid color-mix(in srgb,var(--gold) 45%,var(--border));box-shadow:var(--shadow-lg),inset 0 1px 0 rgba(255,255,255,.12)}
.kg-stage canvas{display:block;width:100%}
.kg-tip{position:absolute;max-width:min(330px,88%);padding:11px 14px;border-radius:14px;background:rgba(4,16,30,.95);color:#eaf4ff;border:1px solid rgba(255,255,255,.2);font-size:13px;line-height:1.45;pointer-events:none;z-index:3;box-shadow:0 8px 24px rgba(0,0,0,.4)}
.kg-ts{margin-top:5px;font-size:12px;color:#9bb6d2}
html[data-lang="bi"] .kg-ts .vi + .en::before{color:#9bb6d2}
.kg-ctl{position:absolute;top:12px;right:12px;display:flex;flex-direction:column;gap:6px;z-index:2}
.kg-ctl button{width:40px;height:40px;border-radius:13px;border:1px solid rgba(255,255,255,.25);background:rgba(4,16,30,.7);color:#eaf4ff;font:700 18px/1 system-ui,sans-serif;cursor:pointer;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.kg-ctl button:hover{background:rgba(242,182,50,.28);border-color:#f2b632}
.kg-ctl [aria-pressed="false"]{opacity:.55}
.kg-hint{position:absolute;left:0;right:0;bottom:10px;text-align:center;font-size:12px;color:#9bb6d2;pointer-events:none;padding:0 12px}
html[data-lang="bi"] .kg-hint .vi + .en::before{color:#9bb6d2}
/* 5 chiều */
.kg-dims{list-style:none;margin:14px 0 0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:10px}
.kg-dims li{display:flex;gap:12px;align-items:flex-start;padding:12px 14px;border-radius:16px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);font-size:13.5px;line-height:1.5;color:var(--muted)}
.kg-dims b{flex:none;min-width:44px;height:30px;padding:0 8px;border-radius:10px;display:grid;place-items:center;background:linear-gradient(135deg,var(--sea-a),var(--sea-b));color:#fff;font-family:var(--display);font-size:15px}
.kg-dims li:nth-child(3) b{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3b2700}
.kg-dims span{min-width:0}
.kg .d{display:inline-block;width:11px;height:11px;border-radius:50%;margin-right:6px;vertical-align:-1px;background:#7fb4f0}
.kg .d.ring{background:transparent;border:3px solid #5ccb92}
.kg .d.star{background:#f2b632;box-shadow:0 0 0 3px rgba(242,182,50,.35)}
.kg-panel{margin-top:16px}
.kg-panel:empty{display:none}
.kg-card{border-top:5px solid hsl(var(--h),80%,60%)}
.kg-card .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.kg-card .spacer{flex:1}
.kg-card .tag{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3b2700;font-weight:800;border-radius:999px;padding:2px 12px;font-family:var(--display)}
.kg-title{font-family:var(--display);font-size:1.2em}
.kg-prog{display:flex;align-items:center;gap:12px;margin-top:12px}
.kg-prog .bar{flex:1;max-width:260px}
.kg-w{margin-top:6px}
.kg-card .acts{display:flex;flex-wrap:wrap;gap:8px}
.kg-card .mt{margin-top:12px}
.kg-sub{margin-top:14px}
.kg-ws{margin-top:8px;display:flex;flex-wrap:wrap;gap:6px}
.kg-ws .chip{padding:5px 11px;font-size:13px}
.kg-det{margin-top:14px;padding-top:12px;border-top:1px dashed var(--border)}
.kg-dt{font-family:var(--display);font-size:1.2em;color:var(--accent-dark)}
.kg-dd{margin-top:6px}
.kg-h{font-family:var(--display);margin:28px 0 10px;font-size:1.25em}
.kg-pick{display:flex;flex-wrap:wrap;gap:12px 20px}
.kg-ps{display:flex;flex-direction:column;gap:8px;padding:12px 14px;border-radius:18px;background:var(--card);border:1px solid var(--border);border-left:6px solid hsl(var(--h),80%,60%);box-shadow:var(--shadow)}
.kg-ps>b{font-size:12.5px;color:var(--muted)}
.kg-pb{display:flex;flex-wrap:wrap;gap:6px}
.kg-pb .chip{padding:6px 11px;min-width:42px;text-align:center}
@media (max-width:640px){.kg-ctl button{width:44px;height:44px}.kg-q{max-width:none}}

/* bản đồ sao: thiên thể của môn, tên cung, mũi tên chuyển bài */
.sm-body{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 14px;margin:0 0 10px}
.sm-pl{display:flex;flex-direction:column;gap:2px;min-width:0}
.sm-pl>b{font-family:var(--display);font-size:1.15em}
.sm-pl .en,.sm-pl .vi{display:inline}
.sm-rd{margin-left:auto}
.kg-stage:focus-visible{outline:3px solid var(--gold);outline-offset:2px}
.sm-nav{position:absolute;top:50%;transform:translateY(-50%);z-index:2;width:52px;height:52px;border-radius:50%;border:1px solid rgba(255,255,255,.3);background:rgba(4,16,30,.72);color:#ffe29a;font:700 20px/1 system-ui,sans-serif;cursor:pointer;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);box-shadow:0 6px 18px rgba(0,0,0,.35)}
.sm-nav.prev{left:12px}.sm-nav.next{right:12px}
.sm-nav:hover:not(:disabled){background:rgba(242,182,50,.32);border-color:#f2b632}
.sm-nav:disabled{opacity:.25;cursor:default}
.sm-sign{position:absolute;left:50%;top:12px;transform:translateX(-50%);z-index:2;max-width:calc(100% - 140px);padding:7px 16px;border-radius:999px;background:rgba(4,16,30,.72);color:#eaf4ff;border:1px solid rgba(242,182,50,.5);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}
.sm-sign .en,.sm-sign .vi{display:inline}
html[data-lang="bi"] .sm-sign .vi + .en::before{content:" / ";color:#9bb6d2}
.sm-g{color:#ffd873;font-size:1.2em;margin-right:4px}
.kg-stage{background:radial-gradient(ellipse at 50% 45%,#10325c 0%,#071a33 52%,#02070f 100%)}
@media (max-width:640px){.sm-nav{width:46px;height:46px}.sm-nav.prev{left:6px}.sm-nav.next{right:6px}.sm-sign{font-size:12.5px;top:8px;max-width:calc(100% - 110px)}}
@media (prefers-reduced-motion:reduce){.sm-nav{transition:none}}
/* tóm tắt bài theo phần: mỗi phần một màu, trùng màu hạt trên bản đồ */
.sm-secs{display:grid;gap:12px;margin-top:10px}
.sm-sec{padding-left:12px;border-left:4px solid hsl(var(--h),75%,60%)}
.sm-sh{display:block;font-size:13px;color:var(--muted);margin-bottom:4px}
.sm-sh .en,.sm-sh .vi{display:inline}
.sm-sec .chip{border-color:color-mix(in srgb,hsl(var(--h),75%,60%) 40%,var(--border))}
.sm-find{margin-top:22px}
/* chú giải màu các phần của bài, trên sân khấu */
.sm-leg{position:absolute;left:12px;bottom:66px;z-index:2;display:flex;flex-direction:column;gap:4px;max-width:min(260px,46%);pointer-events:none}
.sm-leg span{display:flex;align-items:center;gap:7px;font:600 12px/1.25 system-ui,sans-serif;color:#eaf4ff;padding:3px 9px;border-radius:999px;background:rgba(4,16,30,.62);-webkit-backdrop-filter:blur(3px);backdrop-filter:blur(3px);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sm-leg i{flex:none;width:10px;height:10px;border-radius:50%}
@media (max-width:640px){.sm-leg{display:none}}
.sm-credit{margin:14px 2px 0;line-height:1.5}
.sm-credit .en,.sm-credit .vi{display:block}
/* ===== v2: bản đồ lớn + lý thuyết tách riêng ===== */
.kg-stage{border-radius:28px;box-shadow:0 22px 60px rgba(4,16,40,.38),inset 0 1px 0 rgba(255,255,255,.14)}
.sm-nav{width:58px;height:58px;font-size:22px;border-color:rgba(242,182,50,.6)}
.sm-sign{font-size:15px;padding:8px 20px;border-color:rgba(242,182,50,.7);box-shadow:0 6px 22px rgba(0,0,0,.4)}
/* bánh xe 12 cung */
.sm-wheel{display:grid;grid-template-columns:repeat(12,1fr);gap:6px;margin:12px 0 0}
.sm-wb{font:inherit;display:flex;flex-direction:column;align-items:center;gap:1px;padding:8px 2px;border-radius:14px;border:1px solid var(--border);background:var(--card);color:var(--ink);cursor:pointer}
.sm-wb .g{font-size:20px;line-height:1.1}.sm-wb .n{font-size:11px;color:var(--muted)}
.sm-wb:hover:not(:disabled){border-color:var(--gold);background:var(--accent-soft)}
.sm-wb.on{background:linear-gradient(180deg,#F8DE9A,#E3B94C);border-color:transparent;color:#3b2700;box-shadow:0 8px 18px rgba(227,185,76,.4)}
.sm-wb.on .n{color:#6b4a00}
.sm-wb:disabled{opacity:.35;cursor:default}
/* lý thuyết */
.sm-theory{margin-top:22px;padding:20px 22px;border-radius:24px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow)}
.sm-th-head .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.sm-th-head .spacer{flex:1}
.sm-th-head .tag{background:linear-gradient(180deg,#F8DE9A,#E3B94C);color:#3b2700;font-weight:800;border-radius:999px;padding:2px 12px;font-family:var(--display)}
.sm-th-head .kg-title{font-family:var(--display);font-size:1.3em}
.sm-th-head .kg-title .en{font-size:.78em}
.sm-th-head .acts{display:flex;flex-wrap:wrap;gap:8px}
.sm-th-head .mt{margin-top:12px}
.sm-th-tools{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:16px 0 4px;padding-top:14px;border-top:1px dashed var(--border)}
.sm-th-tools .kg-q{flex:1 1 280px;max-width:none}
.sm-all{display:inline-flex;align-items:center;gap:7px;font-size:14px;color:var(--muted);cursor:pointer}
.sm-sec{margin-top:18px}
.sm-sh{display:flex;align-items:center;gap:9px;margin:0 0 10px;font-size:1rem;font-family:var(--display)}
.sm-sh i{width:12px;height:12px;border-radius:50%;background:hsl(var(--h),80%,62%);box-shadow:0 0 0 4px hsl(var(--h) 80% 62% / .22)}
.sm-sh small{margin-left:auto;font:600 12px system-ui;color:var(--muted);background:var(--sunk);padding:2px 9px;border-radius:999px}
.sm-sh .en,.sm-sh .vi{display:inline}
html[data-lang="bi"] .sm-sh .vi + .en::before{content:" / ";color:var(--faint)}
.sm-cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:12px}
.sm-card{padding:13px 15px;border-radius:16px;background:var(--bg,var(--card));border:1px solid var(--border);border-left:5px solid hsl(var(--h),78%,60%);box-shadow:var(--shadow);transition:transform .15s,box-shadow .15s,border-color .15s}
.sm-card:hover,.sm-card:focus-visible{transform:translateY(-2px);box-shadow:var(--shadow-lg);outline:none}
.sm-card.on{border-color:var(--gold);background:var(--accent-soft);box-shadow:0 0 0 3px color-mix(in srgb,var(--gold) 45%,transparent)}
.sm-ct{font-family:var(--display);font-size:1.05em;color:var(--accent-dark);line-height:1.3}
.sm-ct .en{font-family:var(--ui);font-size:.8em;font-weight:500;color:var(--muted)}
.sm-cd{margin-top:6px;font-size:13.5px;line-height:1.5;color:var(--ink)}
.sm-cd .en{color:var(--muted);margin-top:2px}
.sm-ca{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.sm-ca .btn{padding:4px 10px;font-size:12.5px}
.sm-hits{display:grid;gap:8px;margin-top:8px}
.sm-hit{display:flex;gap:12px;align-items:flex-start;text-align:left;font:inherit;padding:10px 14px;border-radius:14px;border:1px solid var(--border);background:var(--card);cursor:pointer;color:var(--ink)}
.sm-hit:hover{border-color:var(--accent);background:var(--accent-soft)}
.sm-hit small{display:block;color:var(--muted);margin-top:2px;font-size:12.5px}
@media (max-width:700px){.sm-wheel{grid-template-columns:repeat(6,1fr)}.sm-theory{padding:16px 14px}.sm-cards{grid-template-columns:1fr}.sm-nav{width:46px;height:46px}}

/* ---------- 📚 Từ vựng chung cho cả 5 môn ---------- */
.vc-py{color:var(--muted);font-size:.93em}
.vc-card .vc-py{font-size:1.1em}
.vc-big[lang="zh"]{font-size:clamp(40px,11vw,72px)}

/* thanh tab gọn: tab ít dùng ẩn sau nút "⋯ Thêm" (app.js: TAB_MORE); tab đang mở luôn hiện */
.tabs:not(.more-open) .tab[data-more]:not([aria-selected="true"]){display:none}
.tab-toggle{font:inherit;font-size:13px;font-weight:700;border:1px dashed var(--border);border-radius:13px;padding:9px 13px;background:transparent;color:var(--muted);cursor:pointer;justify-self:end;white-space:nowrap}
.tab-toggle:hover{background:var(--accent-soft);color:var(--accent-dark)}
@media (max-width:640px){.tab-toggle{flex:none}}

/* ✍️ Tự luận: nhóm chip bộ đề + câu "circle all that apply" */
.oq-grp{margin:10px 0 4px}.oq-grp>.muted{display:block;margin-bottom:4px;font-weight:600}