:root{
  --orange:#ef7f39; --orange-d:#d96a25; --orange-l:#fff1e7;
  --ink:#333333; --ink-2:#555; --muted:#737373; --line:#e6e3df;
  --bg:#f6f4f1; --card:#ffffff; --good:#1f9d55; --good-l:#e6f6ec; --bad:#d23c3c; --bad-l:#fdeaea; --warn:#c98a00; --warn-l:#fff7e0;
  --r:16px; --sh:0 1px 2px rgba(0,0,0,.05),0 8px 24px rgba(51,51,51,.06);
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 Inter,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;min-height:100vh;display:flex;flex-direction:column}
a{color:var(--orange-d);text-decoration:none}
h1{font-size:1.5rem;margin:.2rem 0 .4rem;font-weight:800;letter-spacing:-.01em}
h2{font-size:1.15rem;margin:1.4rem 0 .6rem;font-weight:700}
h3{font-size:1rem;margin:1rem 0 .4rem;font-weight:700}
p{margin:.3rem 0}
.muted{color:var(--muted)} .small{font-size:.85rem} .tiny{font-size:.75rem} .danger{color:var(--bad)}
.mono{font-family:"Courier New",monospace;font-weight:700}
.wrap{width:100%;max-width:960px;margin:0 auto;padding:16px 16px 40px;flex:1}
.foot{text-align:center;color:var(--muted);font-size:.8rem;padding:18px}

/* header */
.top{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:5}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-size:1.15rem}
.brand img{height:40px;width:auto}
.brand b{color:var(--orange)}
.top-right{display:flex;align-items:center;gap:10px}
.langs{display:flex;background:var(--bg);border-radius:999px;padding:3px}
.langs button{border:0;background:transparent;padding:5px 12px;border-radius:999px;font:inherit;font-weight:700;font-size:.8rem;color:var(--muted);cursor:pointer}
.langs button.on{background:var(--ink);color:#fff}
.userbox{display:flex;align-items:center;gap:8px}
.userbox img,.avatar{width:32px;height:32px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:var(--orange);color:#fff;font-weight:700}
.userbox button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:5px 10px;font:inherit;font-size:.8rem;cursor:pointer;color:var(--ink-2)}
.tabs{display:flex;gap:6px;padding:10px 16px 0;max-width:960px;margin:0 auto;width:100%;overflow-x:auto}
.tabs a{padding:8px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);color:var(--ink-2);font-weight:600;font-size:.9rem;white-space:nowrap}
.tabs a.on{background:var(--orange);border-color:var(--orange);color:#fff}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 16px;border-radius:12px;font-weight:700;border:1px solid transparent;cursor:pointer;font:inherit;font-weight:700;line-height:1.2;transition:transform .05s}
.btn:active{transform:scale(.98)}
.btn.primary{background:var(--orange);color:#fff}
.btn.primary:hover{background:var(--orange-d)}
.btn.dark{background:var(--ink);color:#fff}
.btn.ghost{background:#fff;border-color:var(--line);color:var(--ink)}
.btn.big{width:100%;padding:14px;font-size:1.05rem}
.row-btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.row-between{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}
.spk{border:0;background:transparent;cursor:pointer;font-size:1rem;padding:0 4px;vertical-align:middle}

/* cards */
.card{background:var(--card);border-radius:var(--r);box-shadow:var(--sh);padding:16px}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:14px}
.sec{margin-top:1.6rem}
.test-card{display:flex;flex-direction:column;gap:10px}
.test-card.mock{border:2px solid var(--orange);background:linear-gradient(180deg,#fff,var(--orange-l))}
.card-head{display:flex;gap:12px;align-items:flex-start}
.card-head h3{margin:0}
.card-meta{display:flex;gap:10px;align-items:center;flex-wrap:wrap;font-size:.85rem;color:var(--ink-2)}
.card-actions{display:flex;gap:8px;flex-wrap:wrap}
.card-actions .btn{flex:1;min-width:120px}
.ico{width:44px;height:44px;border-radius:12px;flex:none;background:var(--orange-l) center/26px no-repeat}
.ico-chat{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ef7f39' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M21 15a2 2 0 0 1-2 2H7l-4 4V5a2 2 0 0 1 2-2h14a2 2 0 0 1 2 2z'/%3E%3C/svg%3E")}
.ico-bolt{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ef7f39' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolygon points='13 2 3 14 12 14 11 22 21 10 12 10 13 2'/%3E%3C/svg%3E")}
.ico-sign{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ef7f39' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolygon points='7.86 2 16.14 2 22 7.86 22 16.14 16.14 22 7.86 22 2 16.14 2 7.86 7.86 2'/%3E%3C/svg%3E")}
.ico-board{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ef7f39' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2' y='4' width='20' height='14' rx='2'/%3E%3Cline x1='8' y1='22' x2='16' y2='22'/%3E%3Cline x1='12' y1='18' x2='12' y2='22'/%3E%3C/svg%3E")}
.ico-star{background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%23ef7f39' stroke='%23ef7f39' stroke-width='2' stroke-linejoin='round'%3E%3Cpolygon points='12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2'/%3E%3C/svg%3E")}
.badge{display:inline-block;padding:2px 9px;border-radius:999px;font-size:.78rem;font-weight:700}
.badge.good{background:var(--good-l);color:var(--good)} .badge.bad{background:var(--bad-l);color:var(--bad)} .badge.warn{background:var(--warn-l);color:var(--warn)}
.n.good{color:var(--good)} .n.warn{color:var(--warn)}

/* home */
.hello{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:6px}
.stat{background:#fff;border-radius:14px;padding:12px;box-shadow:var(--sh);display:flex;flex-direction:column;align-items:center;text-align:center}
.stat .n{font-size:1.5rem;font-weight:800;color:var(--orange)} .stat .l{font-size:.75rem;color:var(--muted)}
.empty{text-align:center;color:var(--muted);padding:40px 10px}

/* login */
.login-body .wrap{display:flex;align-items:center;justify-content:center}
.login-card{background:#fff;border-radius:22px;box-shadow:var(--sh);padding:32px 24px;max-width:420px;width:100%;text-align:center;margin:20px auto}
.login-logo{width:220px;height:auto}
.login-card h1{margin-top:6px}
.hint{margin:14px 0 18px;color:var(--ink-2)}
.gbtn{display:flex;justify-content:center;min-height:44px}
.alert{background:var(--bad-l);color:var(--bad);padding:10px;border-radius:10px;font-size:.9rem}
.login-points{list-style:none;padding:0;margin:22px 0 0;display:flex;justify-content:center;gap:12px;flex-wrap:wrap;color:var(--muted);font-size:.8rem}
.login-points li::before{content:"✓ ";color:var(--good)}

/* quiz */
.quiz-body .tabs{display:none}
.quiz{max-width:640px;margin:0 auto}
.quiz-top{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.exit{width:36px;height:36px;border-radius:50%;background:#fff;border:1px solid var(--line);display:inline-flex;align-items:center;justify-content:center;color:var(--muted);font-weight:700;flex:none}
.quiz-title{flex:1;display:flex;flex-direction:column;line-height:1.2}
.counter{font-weight:700;color:var(--muted);font-size:.9rem;white-space:nowrap}
.progress{height:8px;background:#e9e5e0;border-radius:999px;overflow:hidden;margin-bottom:14px}
.progress .bar{height:100%;background:var(--orange);width:0;transition:width .3s}
.qcard{background:#fff;border-radius:20px;box-shadow:var(--sh);padding:20px 18px 18px}
.qtitle{color:var(--muted);font-size:.85rem;font-weight:600;text-transform:uppercase;letter-spacing:.04em;margin:0 0 10px}
.prompt{display:flex;flex-direction:column;align-items:center;text-align:center;gap:8px;margin-bottom:8px}
.prompt .en{font-size:1.45rem;font-weight:800;line-height:1.25;margin:0}
.prompt .spk-big{border:1px solid var(--line);background:var(--bg);border-radius:999px;padding:6px 14px;font:inherit;font-size:.85rem;cursor:pointer;color:var(--ink-2)}
.prompt svg{max-width:100%;height:auto}
.prompt svg.sign{width:180px;height:180px}
.prompt svg.wide{width:300px;max-width:100%;height:auto}
.prompt svg.board{width:300px;max-width:100%}
.qhint{text-align:center;font-size:.95rem;margin:0 0 10px}
.options{display:grid;gap:10px;margin-top:12px}
.opt{display:flex;align-items:center;gap:12px;width:100%;text-align:left;background:#fff;border:2px solid var(--line);border-radius:14px;padding:12px 14px;font:inherit;font-size:1rem;cursor:pointer;color:var(--ink);transition:border-color .12s,background .12s}
.opt:hover{border-color:#c9c3bb}
.opt .k{width:30px;height:30px;border-radius:9px;background:var(--bg);display:inline-flex;align-items:center;justify-content:center;font-weight:800;color:var(--muted);flex:none;text-transform:uppercase}
.opt.sel{border-color:var(--ink);background:#fafafa}
.opt.right{border-color:var(--good);background:var(--good-l)} .opt.right .k{background:var(--good);color:#fff}
.opt.wrong{border-color:var(--bad);background:var(--bad-l)} .opt.wrong .k{background:var(--bad);color:#fff}
.opt:disabled{cursor:default}
.feedback{margin-top:14px;padding:12px 14px;border-radius:12px;background:var(--bg)}
.feedback.good{background:var(--good-l)} .feedback.bad{background:var(--bad-l)}
.fb-line{font-weight:800;margin:0}
.fb-explain{margin:6px 0 0;font-size:.95rem}
.qnav{margin-top:14px}

/* result */
.result-head{display:flex;gap:20px;align-items:center;background:#fff;border-radius:20px;box-shadow:var(--sh);padding:20px;flex-wrap:wrap}
.result-head.pass{border-left:6px solid var(--good)} .result-head.fail{border-left:6px solid var(--bad)}
.ring{--p:0;width:120px;height:120px;border-radius:50%;background:conic-gradient(var(--orange) calc(var(--p)*1%),#eee 0);display:grid;place-items:center;flex:none}
.ring span{width:92px;height:92px;border-radius:50%;background:#fff;display:grid;place-items:center;font-weight:800;font-size:1.5rem}
.pass .ring{background:conic-gradient(var(--good) calc(var(--p)*1%),#eee 0)}
.fail .ring{background:conic-gradient(var(--bad) calc(var(--p)*1%),#eee 0)}
.review{display:grid;gap:10px}
.rv{border-left:5px solid var(--bad)} .rv.ok{border-left-color:var(--good)}
.rv-head{display:flex;align-items:center;gap:10px}
.rv-head .num{font-weight:800;color:var(--muted)} .rv-head .mark{margin-left:auto;font-weight:800}
.rv.ok .mark{color:var(--good)} .rv.bad .mark{color:var(--bad)}
.rv-prompt{margin:6px 0}
.rv-prompt .en{font-weight:700;font-size:1.05rem;margin:0}
.rv-prompt svg.sign{width:110px;height:110px} .rv-prompt svg.wide{width:220px;height:auto} .rv-prompt svg.board{width:240px;max-width:100%}
.your span,.corr span,.expl span{color:var(--muted);font-size:.8rem;text-transform:uppercase;letter-spacing:.03em;margin-right:6px}
.your{color:var(--bad)} .corr{color:var(--good);font-weight:600}
.expl{color:var(--ink-2)}

/* tables */
.tablewrap{overflow-x:auto;background:#fff;border-radius:14px;box-shadow:var(--sh)}
.tbl{width:100%;border-collapse:collapse;font-size:.92rem}
.tbl th,.tbl td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}
.tbl th{font-size:.75rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);background:#faf9f7}
.tbl tr:last-child td{border-bottom:0}
.learn-tbl td.en{font-weight:600}

/* learn */
.toc{display:flex;gap:6px;flex-wrap:wrap;margin:6px 0 12px}
.toc a{padding:6px 12px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.85rem;color:var(--ink-2)}
.learn{margin-bottom:14px}
.learn h2:first-child{margin-top:0}
.callout{background:var(--orange-l);border-left:4px solid var(--orange);padding:10px 12px;border-radius:10px;margin-top:12px}
.sign-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px}
.sign-grid.wide{grid-template-columns:repeat(auto-fill,minmax(230px,1fr))}
.sign-item{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;background:var(--bg);border-radius:14px;padding:12px;font-size:.88rem}
.sign-item svg{max-width:100%;height:auto}
.sign-item svg.sign{width:120px;height:120px} .sign-item svg.wide{width:100%;height:auto}
.sign-item svg.board{width:100%}
.sign-item b.en{font-size:.85rem}

@media (max-width:520px){
  h1{font-size:1.3rem}
  .brand span{display:none}
  .userbox button{display:none}
  .stats{gap:8px} .stat .n{font-size:1.25rem}
  .prompt .en{font-size:1.25rem}
  .result-head{flex-direction:column;align-items:flex-start}
}