:root{
  --bg:#07111f; --bg2:#0f172a; --panel:rgba(15,23,42,.78); --panel2:rgba(255,255,255,.08);
  --text:#f8fafc; --muted:#94a3b8; --line:rgba(148,163,184,.2);
  --brand:#38bdf8; --brand2:#22c55e; --gold:#facc15; --danger:#fb7185; --good:#34d399;
  --shadow:0 24px 80px rgba(0,0,0,.35); --radius:24px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:linear-gradient(135deg,#020617 0%,#07111f 40%,#0f172a 100%);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;min-height:100vh}
.bg-orb{position:fixed;border-radius:999px;filter:blur(60px);opacity:.35;pointer-events:none;z-index:-1}
.orb-a{width:420px;height:420px;background:#0ea5e9;top:-100px;left:-100px}
.orb-b{width:520px;height:520px;background:#22c55e;right:-180px;bottom:-180px}
.topbar{position:sticky;top:0;z-index:20;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:14px clamp(16px,4vw,48px);background:rgba(2,6,23,.72);backdrop-filter:blur(18px);border-bottom:1px solid var(--line)}
.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--text)}
.logo-mark{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,var(--brand),var(--brand2));display:grid;place-items:center;font-weight:900;color:#02111f;box-shadow:0 10px 30px rgba(56,189,248,.28)}
.brand small{display:block;color:var(--muted);font-size:.78rem;margin-top:2px}
.nav{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
button,.button{border:0;border-radius:14px;padding:11px 15px;font-weight:800;cursor:pointer;color:var(--text);background:var(--panel2);transition:.18s transform,.18s background,.18s border;touch-action:manipulation}
button:hover{transform:translateY(-1px);background:rgba(255,255,255,.13)}
.primary{background:linear-gradient(135deg,#38bdf8,#22c55e);color:#02111f;box-shadow:0 14px 35px rgba(34,197,94,.18)}
.secondary{background:rgba(56,189,248,.14);border:1px solid rgba(56,189,248,.28)}
.ghost{background:rgba(255,255,255,.05);border:1px solid var(--line)}
.danger{background:rgba(251,113,133,.14);border:1px solid rgba(251,113,133,.35)}
.full{width:100%;margin-top:10px}
main{width:min(1240px,calc(100% - 28px));margin:28px auto 60px}
.view{display:none}
.view.active{display:block;animation:fade .25s ease}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.hero{display:grid;grid-template-columns:1.25fr .75fr;gap:24px;align-items:stretch;margin-bottom:24px}
.hero h1{font-size:clamp(2.3rem,6vw,5.5rem);line-height:.92;letter-spacing:-.07em;margin:10px 0 18px;max-width:880px}
.lead{font-size:clamp(1.05rem,2vw,1.28rem);color:#cbd5e1;max-width:780px;line-height:1.55}
.hero-actions,.mock-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:22px}
.glass,.panel{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);backdrop-filter:blur(18px)}
.hero-card{padding:28px;display:flex;flex-direction:column;justify-content:space-between}
.hero-card h2{font-size:clamp(1.7rem,4vw,3rem);letter-spacing:-.05em;line-height:1;margin:14px 0}
.badge,.pill{display:inline-flex;align-items:center;width:max-content;padding:7px 10px;border-radius:999px;background:rgba(34,197,94,.12);border:1px solid rgba(34,197,94,.3);color:#bbf7d0;font-weight:800;font-size:.8rem}
.eyebrow{text-transform:uppercase;letter-spacing:.16em;color:#7dd3fc;font-size:.75rem;font-weight:900;margin:0 0 8px}
.mini-grid,.dashboard-grid{display:grid;gap:14px}
.mini-grid{grid-template-columns:repeat(3,1fr);margin-top:20px}
.mini-grid div{padding:14px;border-radius:18px;background:rgba(255,255,255,.07);border:1px solid var(--line)}
.mini-grid strong{display:block;font-size:1.7rem}
.mini-grid small,.muted,.hint{color:var(--muted)}
.dashboard-grid{grid-template-columns:repeat(3,1fr);margin-bottom:24px}
.panel{padding:22px}
.panel-head{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:18px}
.panel h2{margin:0;font-size:clamp(1.25rem,2vw,2rem);letter-spacing:-.04em}
.score{font-size:2.3rem;color:var(--gold)}
.progress-track{height:12px;background:rgba(255,255,255,.08);border-radius:999px;overflow:hidden;border:1px solid var(--line)}
.progress-track span{display:block;height:100%;width:0;background:linear-gradient(90deg,#38bdf8,#22c55e,#facc15);transition:.4s width}
.checklist{margin:0;padding:0;list-style:none;display:grid;gap:9px}
.checklist li{padding:10px 12px;border-radius:14px;background:rgba(255,255,255,.06);border:1px solid var(--line)}
.search,input,select{width:100%;border:1px solid var(--line);background:rgba(2,6,23,.7);color:var(--text);border-radius:14px;padding:12px 13px;font:inherit;outline:none}
label{display:block;color:#cbd5e1;font-weight:800;margin:14px 0 4px}
.deck-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(245px,1fr));gap:14px}
.deck-card{padding:16px;border-radius:20px;background:rgba(255,255,255,.06);border:1px solid var(--line);cursor:pointer;transition:.18s transform,.18s border}
.deck-card:hover{transform:translateY(-2px);border-color:rgba(56,189,248,.6)}
.deck-card h3{margin:0 0 8px}
.deck-card p{margin:0 0 12px;color:var(--muted);line-height:1.45}
.deck-meta{display:flex;justify-content:space-between;gap:10px;align-items:center}
.study-layout{display:grid;grid-template-columns:320px 1fr;gap:22px}
.side{position:sticky;top:86px;align-self:start}
.card-zone{min-height:630px}
.flashcard{min-height:350px;perspective:1000px;margin:12px 0;outline:none}
.flash-inner{position:relative;min-height:350px;transform-style:preserve-3d;transition:.45s transform}
.flashcard.flipped .flash-inner{transform:rotateY(180deg)}
.face{position:absolute;inset:0;border-radius:26px;background:radial-gradient(circle at top left,rgba(56,189,248,.19),rgba(15,23,42,.95) 42%),linear-gradient(145deg,rgba(255,255,255,.10),rgba(255,255,255,.03));border:1px solid rgba(148,163,184,.25);display:flex;flex-direction:column;justify-content:center;padding:30px;backface-visibility:hidden;box-shadow:inset 0 1px 0 rgba(255,255,255,.08)}
.face.back{transform:rotateY(180deg);background:radial-gradient(circle at top left,rgba(34,197,94,.18),rgba(15,23,42,.96) 42%)}
.face small{text-transform:uppercase;letter-spacing:.16em;color:#7dd3fc;font-weight:900}
.face h3{font-size:clamp(1.45rem,3vw,2.8rem);line-height:1.15;letter-spacing:-.04em}
.rating-row{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.rate.again{background:rgba(251,113,133,.18)}
.rate.hard{background:rgba(250,204,21,.16)}
.rate.good{background:rgba(56,189,248,.16)}
.rate.easy{background:rgba(34,197,94,.18)}
.type-box{display:flex;gap:10px;margin-top:14px}
.mock-list{display:grid;gap:18px;margin-top:18px}
.question-card{padding:18px;border-radius:20px;background:rgba(255,255,255,.06);border:1px solid var(--line)}
.question-card h3{margin-top:0}
.options{display:grid;gap:10px;margin-top:12px}
.option{display:flex;align-items:flex-start;gap:10px;padding:12px;border-radius:14px;background:rgba(2,6,23,.42);border:1px solid var(--line);cursor:pointer}
.option input{width:auto;margin-top:2px}
.result-card{padding:18px;border-radius:20px;border:1px solid var(--line);background:rgba(56,189,248,.10);margin:16px 0}
.hidden{display:none}
.timer{font-size:1.5rem;font-weight:900;padding:9px 14px;border-radius:14px;background:rgba(250,204,21,.13);border:1px solid rgba(250,204,21,.25);color:#fde68a}
.weak-list,.plan-list,.source-grid{display:grid;gap:12px}
.weak-item,.plan-item{padding:16px;border-radius:18px;background:rgba(255,255,255,.06);border:1px solid var(--line)}
.weak-item{display:grid;grid-template-columns:1fr auto;gap:12px;align-items:center}
.bar-mini{height:8px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden;margin-top:8px}
.bar-mini span{display:block;height:100%;background:linear-gradient(90deg,#fb7185,#facc15,#22c55e)}
.source-grid a{padding:14px;border-radius:16px;background:rgba(56,189,248,.12);border:1px solid rgba(56,189,248,.25);color:#bae6fd;text-decoration:none;font-weight:800}
footer{width:min(1240px,calc(100% - 28px));margin:0 auto 30px;color:var(--muted);display:flex;justify-content:space-between;gap:12px;align-items:center}
code{background:rgba(255,255,255,.10);padding:2px 5px;border-radius:6px}

@media(max-width:900px){
  .hero,.dashboard-grid,.study-layout{grid-template-columns:1fr}
  .side{position:static}
  .nav{overflow:auto;flex-wrap:nowrap;justify-content:flex-start;padding-bottom:2px}
  .topbar{align-items:flex-start;flex-direction:column}
  .rating-row{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:560px){
  main{width:calc(100% - 18px);margin-top:14px}
  .panel,.hero-card{padding:16px;border-radius:20px}
  .hero h1{font-size:2.55rem}
  .mini-grid{grid-template-columns:1fr}
  .type-box,.hero-actions,.mock-actions{flex-direction:column}
  .flashcard,.flash-inner{min-height:340px}
  .face{padding:22px}
}