:root{
  --bg:#f8f3ea;--card:#fffaf1;--ink:#241b15;--muted:#7c6b5c;--line:#eadcc8;--accent:#9b2c1f;--accent2:#246b63;--gold:#c08a2a;--ok:#2f855a;--bad:#c53030;
  --shadow:0 18px 40px rgba(72,48,24,.12);--radius:22px;
}
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input,.ai-config input{padding:11px 13px;border:1px solid var(--line);border-radius:14px;background:#fff;min-height:42px}.filters input{min-width:260px;flex:1}.resource-card{cursor:pointer}.resource-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:13px}.tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:18px}.tabs button{border:1px solid var(--line);background:#fff;border-radius:999px;padding:8px 13px;cursor:pointer}.tabs button.active{background:var(--accent);color:#fff}.detail-layout{display:grid;grid-template-columns:1fr 320px;gap:22px}.unit-detail{padding:26px}.side-list{display:grid;gap:10px}.mini-item{padding:12px;border:1px solid var(--line);border-radius:16px;background:#fff;cursor:pointer}.graph-wrap{display:grid;grid-template-columns:300px 1fr;gap:18px}.graph-nav{display:grid;gap:10px}.graph-node{border:1px solid var(--line);background:#fff;border-radius:18px;padding:12px;cursor:pointer}.graph-node.active{background:#f8e8d7;border-color:#d8a773}.graph-canvas{min-height:420px;position:relative;background:#fffdf9;border:1px dashed #d9c4aa;border-radius:var(--radius);overflow:hidden}.bubble{position:absolute;border:1px solid var(--line);background:#fff;border-radius:999px;padding:10px 14px;box-shadow:0 10px 18px rgba(0,0,0,.08);cursor:pointer;max-width:180px;text-align:center}.bubble.root{background:var(--accent);color:#fff;border-color:var(--accent);font-weight:800}.bubble:hover{transform:scale(1.04)}.quiz-options{display:grid;gap:10px;margin:16px 0}.quiz-options button{text-align:left;border:1px solid var(--line);background:#fff;border-radius:16px;padding:12px;cursor:pointer}.quiz-options button.correct{background:#e6f4ea;border-color:#8cc69d}.quiz-options button.wrong{background:#ffe8e8;border-color:#e19a9a}.teacher-grid{display:grid;grid-template-columns:1fr 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14px;border-radius:18px;white-space:pre-wrap}.msg.user{justify-self:end;background:var(--accent);color:#fff}.msg.bot{justify-self:start;background:#f4eadc}.ai-form{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line)}.ai-form input{flex:1;min-width:0}.ai-form button{border:0;border-radius:14px;padding:0 15px;background:var(--accent2);color:#fff;font-weight:700}.ai-config{padding:0 14px 14px;color:var(--muted);font-size:13px}.ai-config label{display:grid;gap:6px;margin:8px 0}.toast{position:fixed;left:50%;bottom:25px;transform:translateX(-50%);background:#201710;color:#fff;padding:10px 14px;border-radius:999px;display:none;z-index:40}.empty{padding:40px;text-align:center;color:var(--muted);background:#fff;border-radius:20px;border:1px dashed var(--line)}code{background:#fff;border:1px solid var(--line);padding:2px 6px;border-radius:8px}.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:none;align-items:center;justify-content:center;z-index:50;padding:20px}.modal.open{display:flex}.modal-card{width:min(860px,100%);max-height:90vh;overflow:auto;background:#fffdf9;border-radius:24px;padding:24px;border:1px solid var(--line)}@media(max-width:900px){.hero,.detail-layout,.graph-wrap,.teacher-grid{grid-template-columns:1fr}.grid,.grid.two,.grid.four{grid-template-columns:1fr 1fr}.nav{display:none;position:absolute;top:68px;left:5vw;right:5vw;background:#fff;border:1px solid var(--line);border-radius:20px;padding:12px;box-shadow:var(--shadow)}.nav.open{display:flex}.menu-btn{display:block}.hero h1{font-size:34px}.hero-card{padding:28px}.graph-canvas{min-height:520px}}@media(max-width:560px){.grid,.grid.two,.grid.four{grid-template-columns:1fr}.section-head{display:block}.filters 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