:root{
  --navy:#0A1B3D; --navy2:#0c2048; --panel:#0F2452; --panel2:#13295a;
  --line:rgba(255,255,255,.10); --line2:rgba(255,255,255,.16); --gline:rgba(201,162,75,.38);
  --gold:#C9A24B; --gold2:#E6C877; --gold-dk:#9A7A1E;
  --txt:#F5F7FF; --muted:#9FB0D0; --muted2:#7d8db0;
  --paper:#FBFBFE; --ink:#0A1B3D; --ink-mut:#8A93A8; --ink-line:#E7E9F0;
  --again:#C0392B; --hard:#B26A00; --good:#1D7A54; --easy:#9A7A1E;
  --radius:16px;
  --font:-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",Inter,Roboto,Arial,sans-serif;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:
  radial-gradient(1200px 600px at 80% -10%, #12305f 0%, rgba(18,48,95,0) 60%),
  radial-gradient(900px 500px at -10% 110%, #10254f 0%, rgba(16,37,79,0) 55%),
  var(--navy);
  color:var(--txt);font-family:var(--font);-webkit-font-smoothing:antialiased;letter-spacing:.01em;min-height:100vh}
a{color:var(--gold2)}
button{font-family:inherit;cursor:pointer;border:none;border-radius:12px;padding:12px 18px;font-size:15px;font-weight:500;
  transition:transform .15s ease,filter .15s ease,background .2s ease,border-color .2s ease}
button:active{transform:scale(.98)}
.btn-primary{background:var(--gold);color:#231a06;font-weight:600}
.btn-primary:hover{filter:brightness(1.06)}
.btn-ghost{background:rgba(255,255,255,.06);color:var(--txt);border:0.5px solid var(--line2)}
.btn-ghost:hover{background:rgba(255,255,255,.11)}
.hidden{display:none!important}
.wrap{max-width:1120px;margin:0 auto;padding:22px}
.center{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}

/* ---------- Login gate ---------- */
.gate{background:rgba(15,36,82,.72);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border:0.5px solid var(--gline);border-radius:24px;padding:44px 38px;max-width:440px;width:100%;text-align:center;
  box-shadow:0 30px 80px rgba(0,0,0,.45)}
.gate .logo{width:76px;height:76px;border-radius:22px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;
  border:1.5px solid var(--gold);color:var(--gold);font-size:34px;background:rgba(201,162,75,.06)}
.gate h1{margin:0 0 4px;font-size:28px;font-weight:600;letter-spacing:.06em}
.gate .kicker{color:var(--gold2);font-size:12px;letter-spacing:.22em;text-transform:uppercase;margin-bottom:10px}
.gate p{color:var(--muted);margin:0 0 24px;font-size:14px;line-height:1.5}
.gate input{width:100%;padding:15px 16px;border-radius:14px;border:0.5px solid var(--line2);background:rgba(255,255,255,.05);
  color:var(--txt);font-size:16px;margin-bottom:14px;text-align:center;letter-spacing:.05em}
.gate input::placeholder{color:var(--muted2)}
.gate input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,162,75,.18)}
.gate .err{color:#ff8f87;font-size:13px;min-height:18px;margin-bottom:6px}
.gate .btn-primary{width:100%;padding:15px}

/* ---------- Header ---------- */
header.top{position:sticky;top:0;z-index:20;background:rgba(10,27,61,.72);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);
  border-bottom:0.5px solid var(--line)}
.top .wrap{display:flex;align-items:center;gap:14px;padding:12px 22px}
.brand{display:flex;align-items:center;gap:11px;cursor:pointer}
.brand .dot{width:38px;height:38px;border-radius:11px;border:1.5px solid var(--gold);color:var(--gold);
  display:flex;align-items:center;justify-content:center;font-size:18px;background:rgba(201,162,75,.05)}
.brand .bt{line-height:1.15}
.brand .bt b{font-size:16px;font-weight:600;letter-spacing:.03em;display:block}
.brand .bt span{font-size:11px;color:var(--muted)}
.top .spacer{flex:1}
.searchbox input{width:300px;max-width:42vw;padding:11px 15px;border-radius:12px;border:0.5px solid var(--line2);
  background:rgba(255,255,255,.05);color:var(--txt);font-size:14px}
.searchbox input:focus{outline:none;border-color:var(--gold);box-shadow:0 0 0 3px rgba(201,162,75,.14)}
.userchip{background:rgba(255,255,255,.06);border:0.5px solid var(--line2);padding:9px 14px;border-radius:20px;font-size:13px;color:var(--muted);cursor:pointer}
.userchip:hover{color:var(--txt);border-color:var(--gline)}

/* ---------- Overall hero ---------- */
.overall{background:linear-gradient(180deg,rgba(15,36,82,.9),rgba(12,32,72,.9));
  border:0.5px solid var(--gline);border-radius:20px;padding:24px;margin:20px 0;box-shadow:0 20px 60px rgba(0,0,0,.28)}
.overall h2{margin:0 0 4px;font-size:15px;font-weight:500;color:var(--muted)}
.overall .sub{color:var(--muted);font-size:13px;margin-bottom:16px}
.overall .sub b{color:var(--gold2);font-weight:600}
.overall .hero-row{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.overall .big{font-size:44px;font-weight:600;color:var(--gold2);min-width:96px;line-height:1}
.overall .big small{font-size:20px}
.overall .hero-row > .grow{flex:1;min-width:220px}
.pbar{height:9px;border-radius:6px;background:rgba(255,255,255,.08);overflow:hidden}
.pbar > span{display:block;height:100%;background:var(--gold);border-radius:6px;transition:width .6s cubic-bezier(.2,.7,.2,1)}
.stats{display:flex;gap:22px;flex-wrap:wrap;margin-top:14px}
.stat{font-size:12px;color:var(--muted)}
.stat b{display:block;font-size:22px;color:var(--txt);font-weight:600}

/* ---------- Countdown ---------- */
.section-h{font-size:13px;font-weight:500;color:var(--muted);letter-spacing:.03em;margin:20px 0 10px}
.countdown{display:flex;gap:9px;overflow-x:auto;padding:2px 0 8px;scrollbar-width:thin}
.cd{flex:0 0 auto;background:var(--panel);border:0.5px solid var(--line);border-radius:12px;padding:10px 14px;font-size:11px;color:var(--muted);white-space:nowrap}
.cd b{color:var(--gold2);font-size:16px;font-weight:600;display:block}
.cd.soon b{color:#f0b45e}.cd.urgent b{color:#ff9f87}

/* ---------- Subject grid ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:14px}
.subj{background:var(--panel);border:0.5px solid var(--line);border-radius:16px;padding:18px;cursor:pointer;position:relative;
  transition:transform .18s ease,border-color .2s ease,background .2s ease}
.subj:hover{transform:translateY(-3px);border-color:var(--gline);background:var(--panel2)}
.subj h3{margin:0 0 5px;font-size:16px;font-weight:600;padding-right:52px}
.subj .meta{color:var(--muted);font-size:12px;margin-bottom:14px}
.subj .exam{position:absolute;top:17px;right:17px;font-size:11px;background:rgba(201,162,75,.08);border:0.5px solid var(--gline);padding:3px 9px;border-radius:8px;color:var(--gold2)}
.subj .exam.urgent{color:#ff9f87;border-color:rgba(255,120,100,.4);background:rgba(255,120,100,.08)}
.subj .exam.soon{color:#f0b45e;border-color:rgba(240,160,70,.4);background:rgba(240,160,70,.08)}
.subj .plabel{display:flex;justify-content:space-between;font-size:11px;color:var(--muted2);margin:12px 0 5px}
.subj .plabel span:last-child{color:var(--muted)}
.reps{display:flex;gap:4px;margin-top:12px;flex-wrap:wrap}
.reps i{width:15px;height:7px;border-radius:3px;background:rgba(255,255,255,.08)}
.reps i.on{background:var(--gold)}
.subj .due{margin-top:13px;font-size:12px;color:var(--gold2);font-weight:600}
.subj .due.none{color:var(--muted2);font-weight:400}

/* ---------- Study ---------- */
.study{max-width:840px;margin:0 auto}
.study .bar{display:flex;align-items:center;gap:12px;margin:14px 0 16px}
.study .bar .title{font-weight:600;font-size:18px}
.study .bar .count{color:var(--muted);font-size:12px}
.qcard{background:var(--paper);color:var(--ink);border-radius:20px;padding:28px;min-height:220px;box-shadow:0 24px 70px rgba(0,0,0,.35)}
.qcard .tag{display:inline-block;font-size:11px;color:var(--ink-mut);letter-spacing:.06em;text-transform:uppercase;margin-bottom:14px}
.qcard .front{font-size:19px;line-height:1.5;font-weight:500;color:var(--ink)}
.qcard .back{font-size:17px;line-height:1.6;border-top:0.5px solid var(--ink-line);margin-top:20px;padding-top:18px;color:var(--ink)}
.qcard b{font-weight:600}
.qcard img{max-width:100%;border-radius:12px;margin:12px 0;border:0.5px solid var(--ink-line);background:#fff}
.qcard ol,.qcard ul{margin:8px 0;padding-left:22px}
.opt{display:block;width:100%;text-align:left;background:#fff;border:0.5px solid var(--ink-line);color:var(--ink);
  padding:13px 15px;border-radius:12px;margin:9px 0;font-weight:500;font-size:15px}
.opt:hover{border-color:var(--gold)}
.opt.correct{border-color:var(--good);background:rgba(29,122,84,.10)}
.opt.wrong{border-color:var(--again);background:rgba(192,57,43,.09)}
.opt .why{display:block;margin-top:6px;font-size:12px;color:var(--ink-mut);font-weight:400}

/* Info panel (inside light card) */
.info{margin-top:18px;background:#F3F5FB;border:0.5px solid var(--ink-line);border-radius:14px;padding:16px}
.info h4{margin:0 0 8px;font-size:11px;color:var(--gold-dk);text-transform:uppercase;letter-spacing:.08em;font-weight:600}
.info .lsrc{font-size:11px;color:var(--ink-mut);margin-bottom:6px;font-weight:500}
.info .src{font-size:14px;line-height:1.55;color:var(--ink);white-space:pre-line}
.info .expl{font-size:15px;line-height:1.62;color:var(--ink)}
.info img{max-width:100%;max-height:420px;border-radius:12px;margin-top:12px;border:0.5px solid var(--ink-line);cursor:zoom-in;display:block}
.subj-fip{border-color:var(--gline);background:linear-gradient(180deg,rgba(201,162,75,.10),rgba(15,36,82,.6))}
.subj-fip h3::after{content:"FIP";font-size:10px;color:#231a06;background:var(--gold);padding:2px 7px;border-radius:6px;margin-left:8px;vertical-align:middle;font-weight:700}
.result.lec .thumb{width:120px;height:80px;object-fit:cover;border-radius:8px;border:0.5px solid var(--line);flex:0 0 auto}
#zoom{cursor:zoom-out;align-items:center}
.modal.lec .lsrc{color:var(--gold2);font-size:12px;margin-bottom:10px}
.lecnav{display:flex;align-items:center;justify-content:center;gap:14px;margin:6px 0 12px;font-size:13px;color:var(--muted)}
.lecnav button{padding:8px 14px;font-size:13px}
#lec-img{width:100%;border-radius:12px;border:0.5px solid var(--line);background:#fff;cursor:zoom-in;display:block}
#lec-text{margin-top:14px;font-size:14px;line-height:1.6;color:var(--txt);white-space:pre-line;background:rgba(255,255,255,.04);border:0.5px solid var(--line);border-radius:12px;padding:14px}
.info .placeholder{color:var(--ink-mut);font-size:13px;font-style:italic}
.info .actions{margin-top:12px;display:flex;gap:10px;flex-wrap:wrap}
.info .actions button{padding:9px 14px;font-size:13px;background:var(--navy);color:var(--txt);border-radius:10px}
.info .actions button:hover{filter:brightness(1.15)}

/* Rating buttons (on dark bg) */
.rate{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-top:16px}
.rate button{padding:14px 8px;background:rgba(255,255,255,.05);border:0.5px solid var(--line2);
  display:flex;flex-direction:column;gap:3px;align-items:center;font-size:15px;font-weight:600}
.rate button:hover{background:rgba(255,255,255,.09)}
.rate .k{font-size:11px;font-weight:400;color:var(--muted)}
.rate .again{color:#ff8f81}.rate .hard{color:#f0b45e}.rate .good{color:#5cd0a0}
.rate .easy{color:var(--gold2);border-color:var(--gline);background:rgba(201,162,75,.10)}
.reveal-btn{width:100%;margin-top:18px}

/* ---------- Modal / search ---------- */
.overlay{position:fixed;inset:0;background:rgba(6,12,28,.66);backdrop-filter:blur(6px);z-index:40;display:flex;align-items:flex-start;justify-content:center;padding:60px 20px;overflow:auto}
.modal{background:var(--panel);border:0.5px solid var(--gline);border-radius:20px;box-shadow:0 30px 80px rgba(0,0,0,.5);max-width:780px;width:100%;padding:24px}
.modal h3{margin:0 0 14px;font-weight:600}
.modal h4{color:var(--gold2);font-size:12px;text-transform:uppercase;letter-spacing:.06em;margin:14px 0 8px;font-weight:600}
.result{padding:13px;border:0.5px solid var(--line);border-radius:12px;margin-bottom:9px;background:rgba(255,255,255,.03);cursor:pointer;font-size:14px}
.result:hover{border-color:var(--gline);background:rgba(255,255,255,.06)}
.result .s{font-size:11px;color:var(--gold2);margin-bottom:3px}
.close{float:right;background:rgba(255,255,255,.06);border:0.5px solid var(--line2);border-radius:10px;padding:7px 13px;font-size:13px;color:var(--txt)}
.toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:var(--panel2);border:0.5px solid var(--gline);padding:13px 20px;border-radius:14px;z-index:60;box-shadow:0 20px 50px rgba(0,0,0,.5);font-size:14px}
@media(max-width:640px){.searchbox input{width:140px}.rate{grid-template-columns:repeat(2,1fr)}.overall .big{font-size:36px}}