:root{--bg:#0d0f12;--bg-elev:#15181d;--bg-elev-2:#1c2026;--border:#262b33;--text:#e6e8eb;--text-dim:#9aa3ad;--text-faint:#6b7480;--accent:#8b7cf6;--accent-dim:#5b4fc4;--good:#4ade80;--warn:#fbbf24;--bad:#f87171;--info:#60a5fa;--radius:12px;--maxw:880px}*{box-sizing:border-box;margin:0;padding:0}html{-webkit-text-size-adjust:100%}body{background:var(--bg);color:var(--text);font:16px/1.55 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;padding-bottom:env(safe-area-inset-bottom)}a{color:inherit;text-decoration:none}h1{font-size:1.5rem;font-weight:650;letter-spacing:-.01em}h2{font-size:1.05rem}h2,h3{font-weight:600}h3{font-size:.95rem}small{color:var(--text-faint)}.wrap{max-width:var(--maxw);margin:0 auto;padding:16px}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:10;background:rgba(13,15,18,.85);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.topbar .wrap{display:flex;align-items:center;gap:14px;padding:12px 16px}.brand{font-weight:650;letter-spacing:-.02em}.brand .dot{color:var(--accent)}.nav{display:flex;gap:4px;margin-left:auto}.nav a{padding:7px 12px;border-radius:999px;color:var(--text-dim);font-size:.875rem;font-weight:500;min-height:36px;display:inline-flex;align-items:center}.nav a:hover{color:var(--text);background:var(--bg-elev)}.nav a.active{color:var(--text);background:var(--bg-elev-2)}.card{background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:16px}.card+.card{margin-top:12px}.grid{display:grid;grid-gap:12px;gap:12px}@media (min-width:720px){.grid.cols-2{grid-template-columns:1fr 1fr}}.muted{color:var(--text-dim)}.faint{color:var(--text-faint)}.row,.spread{display:flex;align-items:center;gap:10px}.spread{justify-content:space-between}.stack{display:flex;flex-direction:column;gap:4px}.mt8{margin-top:8px}.mt12{margin-top:12px}.mt16{margin-top:16px}.mt24{margin-top:24px}.badge{display:inline-flex;align-items:center;gap:5px;font-size:.72rem;font-weight:600;padding:3px 9px;border-radius:999px;background:var(--bg-elev-2);color:var(--text-dim);border:1px solid var(--border);text-transform:uppercase;letter-spacing:.03em}.badge.recurring{color:#fda4af;border-color:#7f1d3a;background:#2a1219}.badge.emphasized{color:var(--warn);border-color:#6b4e16;background:#241c0d}.badge.mentioned{color:var(--text-dim)}.badge.improving{color:var(--good);border-color:#1f5034;background:#0f2419}.badge.regressing{color:var(--bad);border-color:#7f1d1d;background:#2a1212}.badge.stagnant{color:var(--warn);border-color:#6b4e16;background:#241c0d}.badge.new{color:var(--info);border-color:#1e3a6b;background:#0d1a2e}.badge.cat{text-transform:none;letter-spacing:0;color:var(--accent);border-color:var(--accent-dim);background:#1a1730}.list{list-style:none;display:flex;flex-direction:column;gap:8px}.item{display:block;background:var(--bg-elev);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px}.item:hover{border-color:#343b45}.btn,.item .title{font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;padding:0 18px;border-radius:10px;cursor:pointer;font-size:.9rem;border:1px solid var(--border);background:var(--bg-elev-2);color:var(--text);transition:background .12s}.btn:hover{background:#232831}.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff}.btn.primary:hover{background:var(--accent-dim)}.btn:disabled{opacity:.5;cursor:default}input,select,textarea{width:100%;background:var(--bg);color:var(--text);border:1px solid var(--border);border-radius:10px;padding:12px 14px;font:inherit;min-height:44px}input:focus,textarea:focus{outline:none;border-color:var(--accent-dim)}textarea{min-height:84px;resize:vertical}label{font-size:.8rem;color:var(--text-dim);font-weight:600}.utt{display:grid;grid-template-columns:64px 1fr;grid-gap:12px;gap:12px;padding:8px 0;border-bottom:1px solid var(--border)}.utt .who{font-size:.75rem;font-weight:700}.utt .who.teacher{color:var(--accent)}.utt .who.student{color:var(--info)}.utt .t{font-feature-settings:"tnum";font-variant-numeric:tabular-nums;color:var(--text-faint);font-size:.72rem}.center{min-height:70vh;display:grid;place-items:center}.login{width:100%;max-width:360px}.divider{height:1px;background:var(--border);margin:16px 0}.kpi{font-size:1.8rem;font-weight:700;letter-spacing:-.02em}.kpi-label{font-size:.78rem;color:var(--text-dim);text-transform:uppercase;letter-spacing:.04em}.sample-banner{background:#241c0d;border:1px solid #6b4e16;color:var(--warn);border-radius:10px;padding:8px 12px;font-size:.8rem;font-weight:600}