:root{--ink:#071018;--ink-2:#0e1a28;--panel:#132233;--panel-2:#1a2d42;--line:#a8cde824;--fog:#9bb4c8;--paper:#e7f0f7;--paper-dim:#b7c9d8;--accent:#3ecfb2;--accent-2:#f0b429;--danger:#ef6b6b;--good:#5ecf8a;--hard:#f0a35a;--radius:18px;--shadow:0 24px 60px #00000073;color:var(--paper);background:var(--ink);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;font-family:Sora,system-ui,sans-serif;line-height:1.5}*,:before,:after{box-sizing:border-box}html,body{min-height:100%;margin:0}body{background-color:#0000;background-image:radial-gradient(80% 55% at 10% -10%,#3ecfb22e,#0000 55%),radial-gradient(70% 50% at 100% 0,#f0b4291f,#0000 50%),radial-gradient(60% 40% at 50% 110%,#3e8cdc1f,#0000 55%),linear-gradient(160deg,#050b12 0%,#0a1624 45%,#0d1f30 100%);background-position:0 0,0 0,0 0,0 0;background-repeat:repeat,repeat,repeat,repeat;background-size:auto,auto,auto,auto;background-attachment:fixed;background-origin:padding-box,padding-box,padding-box,padding-box;background-clip:border-box,border-box,border-box,border-box;min-height:100vh}#app{max-width:920px;margin:0 auto;padding:28px 20px 64px}button{font:inherit;cursor:pointer;color:inherit;background:0 0;border:none}.brand{flex-direction:column;gap:6px;margin-bottom:28px;animation:.55s both rise;display:flex}.brand-mark{letter-spacing:-.02em;color:var(--paper);font-family:Instrument Serif,Georgia,serif;font-size:clamp(2.6rem,7vw,4.2rem);line-height:.95}.brand-mark em{color:var(--accent);font-style:italic}.brand-sub{color:var(--fog);max-width:38rem;font-size:.95rem}.stats-row{grid-template-columns:repeat(4,1fr);gap:12px;margin-bottom:22px;animation:.55s 60ms both rise;display:grid}.stat{border:1px solid var(--line);background:linear-gradient(#1a2d42e6,#132233d9);border-radius:14px;padding:14px 16px}.stat-value{letter-spacing:-.03em;font-size:1.55rem;font-weight:600}.stat-label{text-transform:uppercase;letter-spacing:.08em;color:var(--fog);margin-top:2px;font-size:.72rem}.stat.due .stat-value{color:var(--accent-2)}.stat.new .stat-value{color:var(--accent)}.panel{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);background:linear-gradient(165deg,#1a2d42eb,#0e1a28eb);padding:22px;animation:.55s .12s both rise}.panel h2{margin:0 0 6px;font-size:1.05rem;font-weight:600}.panel p.hint{color:var(--fog);margin:0 0 16px;font-size:.88rem}.lecture-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:8px;max-height:280px;margin-bottom:18px;padding-right:4px;display:grid;overflow:auto}.lecture-chip{text-align:left;border:1px solid var(--line);background:#07101859;border-radius:12px;align-items:flex-start;gap:10px;padding:10px 12px;transition:border-color .15s,background .15s,transform .15s;display:flex}.lecture-chip:hover{border-color:#3ecfb259;transform:translateY(-1px)}.lecture-chip.active{background:#3ecfb21a;border-color:#3ecfb28c}.lecture-chip .check{border:1.5px solid var(--fog);color:#0000;border-radius:4px;flex-shrink:0;place-items:center;width:16px;height:16px;margin-top:2px;font-size:.65rem;display:grid}.lecture-chip.active .check{background:var(--accent);border-color:var(--accent);color:var(--ink)}.lecture-chip .meta{flex-direction:column;gap:2px;min-width:0;display:flex}.lecture-chip .title{white-space:nowrap;text-overflow:ellipsis;font-size:.82rem;font-weight:500;overflow:hidden}.lecture-chip .count{color:var(--fog);font-size:.72rem}.actions{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.btn{border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:12px 20px;font-size:.92rem;font-weight:600;transition:transform .12s,background .15s,box-shadow .15s,opacity .15s;display:inline-flex}.btn:active{transform:scale(.98)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn-primary{color:#042018;background:linear-gradient(135deg,#3ecfb2,#2bb89e);box-shadow:0 10px 28px #3ecfb247}.btn-primary:hover:not(:disabled){box-shadow:0 14px 34px #3ecfb261}.btn-ghost{border:1px solid var(--line);color:var(--paper-dim);background:#ffffff08}.btn-ghost:hover:not(:disabled){color:var(--paper);border-color:#a8cde859}.btn-danger{color:var(--danger);border:1px solid #ef6b6b4d}.study-top{justify-content:space-between;align-items:center;gap:12px;margin-bottom:18px;animation:.4s both rise;display:flex}.progress-pill{color:var(--fog);align-items:center;gap:10px;font-size:.82rem;display:flex}.progress-bar{background:#ffffff14;border-radius:99px;width:120px;height:6px;overflow:hidden}.progress-bar>span{background:linear-gradient(90deg, var(--accent), var(--accent-2));border-radius:inherit;height:100%;transition:width .35s;display:block}.lecture-tag{letter-spacing:.04em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;font-size:.72rem;display:inline-block}.card-stage{perspective:1400px;margin-bottom:18px;animation:.45s both rise}.flashcard{border-radius:calc(var(--radius) + 4px);color:#0d1b28;min-height:340px;box-shadow:var(--shadow);transform-origin:50%;background:linear-gradient(145deg,#e8f2fafa,#d6e4f0f5);flex-direction:column;justify-content:center;padding:36px 32px;transition:transform .35s cubic-bezier(.22,1,.36,1),box-shadow .35s;display:flex;position:relative}.flashcard.revealed{background:linear-gradient(145deg,#f5fafcfc,#e0ecf6f7)}.flashcard .side-label{letter-spacing:.12em;text-transform:uppercase;color:#5a7388;font-size:.68rem;font-weight:600;position:absolute;top:18px;left:24px}.flashcard .question{letter-spacing:-.01em;margin:12px 0 0;font-family:Instrument Serif,Georgia,serif;font-size:clamp(1.35rem,3.2vw,1.85rem);line-height:1.35}.flashcard .answer{color:#1a3044;border-top:1px solid #0d1b281f;margin-top:22px;padding-top:22px;font-size:1rem;line-height:1.65;animation:.35s both fade-in}.flashcard .answer code,.flashcard .question code{background:#0d1b2812;border-radius:4px;padding:.1em .35em;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em}.recall-hint{color:#5a7388;margin-top:28px;font-size:.85rem;font-style:italic}.study-actions{flex-direction:column;gap:12px;animation:.4s 50ms both rise;display:flex}.rate-prompt{text-align:center;color:var(--fog);margin-bottom:4px;font-size:.88rem}.rate-row{grid-template-columns:repeat(4,1fr);gap:10px;display:grid}.rate-btn{border:1px solid var(--line);background:#132233d9;border-radius:14px;flex-direction:column;align-items:center;gap:4px;padding:14px 10px;transition:transform .12s,border-color .15s,background .15s;display:flex}.rate-btn:hover{transform:translateY(-2px)}.rate-btn .key{letter-spacing:.08em;color:var(--fog);text-transform:uppercase;font-size:.65rem}.rate-btn .label{font-size:.92rem;font-weight:600}.rate-btn .when{color:var(--fog);font-size:.72rem}.rate-btn.again{border-color:#ef6b6b66}.rate-btn.again:hover{background:#ef6b6b1f}.rate-btn.again .label{color:var(--danger)}.rate-btn.hard{border-color:#f0a35a66}.rate-btn.hard:hover{background:#f0a35a1f}.rate-btn.hard .label{color:var(--hard)}.rate-btn.good{border-color:#5ecf8a66}.rate-btn.good:hover{background:#5ecf8a1f}.rate-btn.good .label{color:var(--good)}.rate-btn.easy{border-color:#3ecfb273}.rate-btn.easy:hover{background:#3ecfb21f}.rate-btn.easy .label{color:var(--accent)}.kbd-hint{text-align:center;color:var(--fog);opacity:.8;font-size:.75rem}.done-panel{text-align:center;padding:48px 28px;animation:.5s both rise}.done-panel h1{margin:0 0 10px;font-family:Instrument Serif,Georgia,serif;font-size:clamp(2rem,5vw,3rem);font-weight:400}.done-panel p{color:var(--fog);margin:0 0 28px}.done-stats{flex-wrap:wrap;justify-content:center;gap:10px;margin-bottom:28px;display:flex}.done-chip{border:1px solid var(--line);background:#07101859;border-radius:999px;padding:8px 14px;font-size:.85rem}.empty-state{text-align:center;color:var(--fog);padding:40px 20px}@keyframes rise{0%{opacity:0;transform:translateY(12px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}@media (width<=640px){.stats-row{grid-template-columns:repeat(2,1fr)}.rate-row{grid-template-columns:1fr 1fr}.flashcard{min-height:280px;padding:28px 22px}#app{padding:20px 14px 48px}}