:root{--bg: #faf8f5;--surface: #ffffff;--ink: #1f1d1b;--ink-soft: #4c4945;--muted: #8a857e;--line: #ebe6de;--accent: #c0524d;--accent-soft: #f3dcd9;--success: #5a8a5a;--success-soft: #dcebd9;--warn: #c07e3d;--radius: 14px;--shadow: 0 1px 2px rgba(31, 29, 27, .04), 0 4px 18px rgba(31, 29, 27, .06);--ease: cubic-bezier(.2, .8, .2, 1)}@media(prefers-color-scheme:dark){:root{--bg: #14110f;--surface: #1c1916;--ink: #f3ede3;--ink-soft: #c7bfb2;--muted: #8a8177;--line: #2b2622;--accent: #e08c87;--accent-soft: #3a1f1d;--success: #8bb68a;--success-soft: #1e2d1e;--shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 18px rgba(0, 0, 0, .4)}}*{box-sizing:border-box}html,body{margin:0;padding:0;background:var(--bg);color:var(--ink);font:16px/1.5 ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overscroll-behavior:none}body{min-height:100dvh;padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right)}main#app{max-width:560px;margin:0 auto;padding:max(16px,env(safe-area-inset-top)) 18px max(20px,env(safe-area-inset-bottom))}a{color:var(--accent);text-decoration:none}button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}.muted{color:var(--muted)}.error{color:var(--accent)}.center{text-align:center}.topbar h1{font-size:28px;font-weight:600;letter-spacing:-.01em;margin:8px 0 2px}.topbar .sub{color:var(--muted);margin:0 0 20px}.filters{display:flex;gap:8px;overflow-x:auto;scrollbar-width:none;margin:0 -18px 16px;padding:0 18px 4px}.filters::-webkit-scrollbar{display:none}.chip{flex:0 0 auto;padding:8px 14px;border-radius:999px;background:var(--surface);border:1px solid var(--line);color:var(--ink-soft);font-size:14px;transition:background .15s var(--ease),color .15s var(--ease),border-color .15s var(--ease)}.chip[aria-selected=true],.chip[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}.chip.small{padding:6px 10px;font-size:13px}.lesson-grid{display:flex;flex-direction:column;gap:10px}.lesson-card{display:grid;grid-template-columns:44px 1fr 40px;align-items:center;gap:12px;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);color:inherit;box-shadow:var(--shadow);transition:transform .15s var(--ease)}.lesson-card:active{transform:scale(.99)}.lesson-num{font-variant-numeric:tabular-nums;font-weight:600;color:var(--accent);font-size:20px}.lesson-title{font-weight:500;line-height:1.3}.lesson-sub{font-size:13px;margin-top:2px}.ring{width:36px;height:36px;transform:rotate(-90deg)}.ring-track{fill:none;stroke:var(--line);stroke-width:3}.ring-fill{fill:none;stroke:var(--accent);stroke-width:3;stroke-linecap:round;transition:stroke-dashoffset .4s var(--ease)}.runner-top{display:grid;grid-template-columns:44px 1fr 44px;align-items:center;gap:8px;margin-bottom:12px}.runner-title{text-align:center;line-height:1.15;overflow:hidden}.runner-num{display:block;font-size:12px;color:var(--muted);letter-spacing:.06em;text-transform:uppercase}.runner-lesson{display:block;font-weight:500;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.iconbtn{height:44px;width:44px;display:inline-flex;align-items:center;justify-content:center;font-size:22px;color:var(--ink-soft);border-radius:50%;transition:background .15s var(--ease)}.iconbtn:active{background:var(--line)}.runner-progress{display:flex;gap:3px;flex-wrap:wrap;margin-bottom:20px}.dot{height:4px;flex:1 1 10px;min-width:8px;border-radius:2px;background:var(--line);transition:background .2s var(--ease)}.dot-done{background:var(--accent)}.dot-current{background:var(--ink)}.runner-stage{min-height:55vh;display:flex;flex-direction:column;align-items:stretch;justify-content:flex-start;transition:transform .14s var(--ease),opacity .14s var(--ease)}.runner-stage.advance-out{transform:translate(-10px);opacity:0}.flashcard{position:relative;aspect-ratio:4 / 3;border-radius:var(--radius);perspective:1200px;cursor:pointer;outline:none}.flashcard .face{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);backface-visibility:hidden;transition:transform .18s var(--ease)}.flashcard .back{transform:rotateY(180deg);background:var(--accent-soft);border-color:var(--accent-soft)}.flashcard.flipped .front{transform:rotateY(-180deg)}.flashcard.flipped .back{transform:rotateY(0)}.prompt{font-size:26px;line-height:1.3;font-weight:500}.hint{position:absolute;bottom:16px;font-size:13px}.answer{font-size:28px;font-weight:600;color:var(--accent);line-height:1.25}.note{margin-top:14px;font-size:14px;max-width:36ch}.card-actions{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:16px}.btn{min-height:48px;padding:12px 16px;border-radius:var(--radius);background:var(--ink);color:var(--bg);font-weight:500;font-size:15px;transition:transform .1s var(--ease),background .15s var(--ease)}.btn:active{transform:scale(.98)}.btn.ghost{background:var(--surface);color:var(--ink);border:1px solid var(--line)}.btn.missed{background:var(--accent-soft);color:var(--accent)}.btn.got{background:var(--success-soft);color:var(--success)}.mc-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}.mc-card .prompt{text-align:center;margin-bottom:22px}.mc-options{display:grid;gap:10px}.mc-option{min-height:52px;padding:14px 16px;border-radius:12px;border:1px solid var(--line);background:var(--bg);font-size:16px;font-weight:500;color:var(--ink);text-align:left;transition:background .15s var(--ease),transform .1s var(--ease),border-color .15s var(--ease)}.mc-option:active{transform:scale(.99)}.mc-option.correct{background:var(--success-soft);border-color:var(--success);color:var(--success)}.mc-option.incorrect{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);animation:shake .3s var(--ease)}@keyframes shake{0%,to{transform:translate(0)}25%{transform:translate(-4px)}75%{transform:translate(4px)}}.runner-bottom{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px;margin-top:18px}.mode-toggle{padding:8px 14px;border-radius:999px;background:var(--ink);color:var(--bg);font-size:14px;min-height:36px}.mode-toggle[aria-pressed=true]{background:var(--accent)}.counter{text-align:center;color:var(--muted);font-variant-numeric:tabular-nums;font-size:14px}.done-card{display:flex;flex-direction:column;align-items:center;gap:12px;padding:40px 24px;text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.done-card h2{margin:0;font-weight:600;font-size:24px}.done-actions{display:flex;gap:10px;margin-top:8px}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important}.flashcard .face{transition:none!important}}