:root{
  --bg:#0f172a; --card:#162033; --card2:#1d2a42; --line:#2a3a57; --text:#e8eefc; --muted:#94a3c4;
  --accent:#7c9cff; --accent2:#a78bfa; --ok:#16a34a; --bad:#dc2626;
  --r:16px; --safe-b:env(safe-area-inset-bottom);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 -apple-system,BlinkMacSystemFont,"Inter","Segoe UI",Roboto,sans-serif}
body{transition:background-color .35s ease}
body.tint-ok{background:#0d3b22} body.tint-bad{background:#4a1111}
.view{max-width:760px;margin:0 auto;min-height:100vh;padding:0 16px calc(110px + var(--safe-b))}
.brand{font-weight:800;font-size:22px;letter-spacing:-.02em}.brand span{color:var(--accent);font-weight:600;margin-left:4px}
.sub{color:var(--muted);font-size:14px}
.top{display:flex;justify-content:space-between;align-items:baseline;padding:22px 2px 10px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:16px;margin:12px 0}
.card h3{margin:0 0 10px;font-size:15px;color:var(--muted);font-weight:600}
.kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:10px 0}
.kpi{background:linear-gradient(160deg,var(--card2),var(--card));border:1px solid var(--line);border-radius:var(--r);padding:14px 12px}
.kpi b{display:block;font-size:22px;font-weight:800;letter-spacing:-.02em}
.kpi span{font-size:12px;color:var(--muted)}
.modes{display:grid;gap:10px;margin-top:14px}
.mode{all:unset;cursor:pointer;display:block;background:linear-gradient(135deg,#2b3d6b,#25315a);border:1px solid #3a4f86;border-radius:var(--r);padding:18px 18px}
.mode b{display:block;font-size:18px}.mode span{color:#c7d2f0;font-size:13px}
.mode.ghost{background:var(--card);border-color:var(--line)}
.mode.disabled{opacity:.45;cursor:default}
.btn{all:unset;cursor:pointer;text-align:center;border-radius:14px;padding:13px 18px;font-weight:700}
.btn.primary{background:var(--accent);color:#0b1020}.btn.big{display:block;width:100%;padding:17px;font-size:18px}
/* study */
.bar{position:sticky;top:0;z-index:5;display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:8px;padding:10px 0;background:rgba(15,23,42,.88);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);margin:0 -16px;padding-left:16px;padding-right:16px}
.icon{all:unset;cursor:pointer;width:40px;height:40px;display:grid;place-items:center;border-radius:12px;background:var(--card);border:1px solid var(--line);font-size:18px}
.barmid{font-weight:700;font-size:15px;display:flex;gap:8px;align-items:center;min-width:0}
.barright{display:flex;gap:8px;align-items:center}
.pill{font-size:12px;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:3px 9px;color:var(--muted)}
.badge{font-size:11px;background:var(--accent2);color:#160b33;border-radius:999px;padding:2px 8px;font-weight:700}
.timer{font-variant-numeric:tabular-nums;color:var(--muted);font-size:14px;min-width:44px;text-align:right}
.timer.slow{color:#fbbf24}
.topic{color:var(--muted);font-size:13px;margin:8px 0 4px}
.qtext{font-size:17px}
.qimg{display:block;width:100%;border-radius:12px;margin:12px 0;background:#fff;cursor:zoom-in}
.statements{display:grid;gap:8px;margin:12px 0}
.stmt{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:12px}
.stmt b{color:var(--accent);margin-right:6px}
.opts{display:grid;gap:10px;margin:16px 0}
.opt{all:unset;cursor:pointer;display:flex;gap:12px;align-items:flex-start;background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:14px;font-size:16px}
.opt .l{flex:0 0 28px;height:28px;border-radius:8px;display:grid;place-items:center;background:var(--card2);font-weight:800;font-size:14px}
.opt:active{transform:scale(.99)}
.opts.done .opt{cursor:default}
.opt.right{border-color:#22c55e;background:#123d24}.opt.right .l{background:#22c55e;color:#04210f}
.opt.wrong{border-color:#ef4444;background:#4a1515}.opt.wrong .l{background:#ef4444;color:#2a0505}
.opts.done .opt:not(.right):not(.wrong){opacity:.5}
.result{margin-top:4px}
.verdict{font-size:22px;font-weight:800;margin:6px 0 8px}
.verdict small{display:block;font-size:13px;font-weight:600;color:#fde68a}
.expl{background:rgba(0,0,0,.28);border:1px solid rgba(255,255,255,.12);border-radius:14px;padding:14px 16px}
.expl p{margin:.4em 0}.expl ol,.expl ul{padding-left:1.3em;margin:.4em 0}
.next{position:fixed;left:0;right:0;bottom:0;padding:12px 16px calc(12px + var(--safe-b));background:linear-gradient(transparent,rgba(0,0,0,.55) 30%);z-index:6}
.next .btn{max-width:728px;margin:0 auto}
#flash{position:fixed;inset:0;z-index:50;pointer-events:none;opacity:0}
#flash.ok{background:#16a34a;animation:fl .55s ease-out}
#flash.bad{background:#dc2626;animation:fl .55s ease-out}
@keyframes fl{0%{opacity:.92}100%{opacity:0}}
#zoom{position:fixed;inset:0;z-index:60;background:#000;overflow:auto;touch-action:pinch-zoom pan-x pan-y}
#zoom img{width:100%;min-width:100%;background:#fff}
#zoom .close{position:fixed;top:12px;right:12px}
/* stats */
.parts{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.part{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:14px}
.part h4{margin:0 0 6px;font-size:14px}
.part .big{font-size:28px;font-weight:800}
.part .row{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}
.bar2{height:8px;border-radius:99px;background:var(--card2);overflow:hidden;margin:8px 0 4px}
.bar2 i{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2))}
.weak{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}
.weak:last-child{border:0}
.hint{color:var(--muted);font-size:12px;margin:6px 0 0}
.statswrap{padding-bottom:30px}
.login{display:grid;place-items:center;min-height:100vh;padding:20px}
.loginbox{width:100%;max-width:360px;display:grid;gap:14px;padding:26px}
.loginbox input{all:unset;background:var(--card2);border:1px solid var(--line);border-radius:12px;padding:14px;font-size:16px}
.err{color:#fca5a5;margin:0}
@media (max-width:420px){.kpi b{font-size:18px}.parts{grid-template-columns:1fr}}
.optimg{display:block;width:100%;max-width:320px;margin-top:8px;border-radius:8px;background:#fff}
.opt .t{flex:1;min-width:0}
.stmt p,.opt p,.qtext p{margin:0}
.qtext p+p{margin-top:.6em}
.barmid{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chartbox{position:relative;height:220px}
#st-forecast p{margin:.3em 0;font-size:15px}
#st-forecast p.hint{font-size:12px}

.mode.exam{background:linear-gradient(135deg,#3b2a6b,#2c2357);border-color:#5b4a9a}
.clock{font-variant-numeric:tabular-nums;font-weight:800;font-size:17px;background:var(--card);border:1px solid var(--line);border-radius:10px;padding:4px 10px}
.clock.low{color:#fbbf24;border-color:#a16207}
.dots{display:grid;grid-template-columns:repeat(8,1fr);gap:6px;margin:6px 0 4px}
.dot{all:unset;cursor:pointer;height:30px;border-radius:8px;background:var(--card);border:1px solid var(--line);font-size:12px;display:grid;place-items:center;color:var(--muted)}
.dot.done{background:#2b3d6b;color:var(--text);border-color:#3a4f86}
.dot.cur{outline:2px solid var(--accent)}
.opt.sel{border-color:var(--accent);background:#22305a}.opt.sel .l{background:var(--accent);color:#0b1020}
.exnav{display:grid;grid-template-columns:56px 1fr auto;gap:8px;max-width:760px;margin:0 auto}
.exnav .btn{padding:15px 14px}
.ghostbtn{background:var(--card);border:1px solid var(--line)}
.warn{background:#7c2d12;color:#fde3d3}
.center{text-align:center;padding:22px}
.center .bigscore{font-size:44px;font-weight:800;margin:6px 0}
.center p{color:var(--muted);margin:.5em 0}
.rv{background:var(--card);border:1px solid var(--line);border-radius:14px;margin:8px 0;overflow:hidden}
.rv>summary{list-style:none;cursor:pointer;padding:12px 14px;display:flex;gap:10px;align-items:center}
.rv>summary::-webkit-details-marker{display:none}
.rv .mk{flex:0 0 26px;height:26px;border-radius:8px;display:grid;place-items:center;font-weight:800}
.rv.ok .mk{background:#16a34a}.rv.bad .mk{background:#dc2626}
.rv .sm{flex:1;min-width:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:14px}
.rv .body{padding:0 14px 14px}
.exrow{display:flex;justify-content:space-between;padding:8px 0;border-bottom:1px solid var(--line)}
.exrow:last-child{border:0}