:root{--bg: #0c0d12;--bg-soft: #14161d;--bg-card: #191c25;--text: #f2f4f9;--muted: #949cb0;--line: #262a36;--glow: #15181f;--accent: #a78bfa;--pivot: #ff6b6b;--good: #4ecdc4;--warn: #ffd93d;--radius: 18px;--shadow: 0 16px 40px rgba(0, 0, 0, .5)}:root[data-theme=classic]{--bg: #12141c;--bg-soft: #1b1e2b;--bg-card: #21273a;--text: #eef1f7;--muted: #9aa3b8;--line: #2e3550;--glow: #1d2233;--shadow: 0 10px 30px rgba(0, 0, 0, .4);--accent: #9b8cff}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}html,body{margin:0;min-height:100%;background:radial-gradient(1100px 700px at 50% -20%,var(--glow),var(--bg));color:var(--text);font-family:Segoe UI,system-ui,-apple-system,Roboto,Helvetica,Arial,sans-serif;overflow-x:hidden;overscroll-behavior:none;-webkit-tap-highlight-color:transparent}body{min-height:100dvh}button,a{-webkit-tap-highlight-color:transparent;-webkit-touch-callout:none;touch-action:manipulation}button,a.back,.diff-card,.option{-webkit-user-select:none;user-select:none}#app{max-width:640px;margin:0 auto;padding:20px 18px 60px;padding-left:max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right));padding-bottom:max(60px,env(safe-area-inset-bottom));padding-top:max(20px,env(safe-area-inset-top))}button{font-family:inherit}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:16px}.back{color:var(--muted);text-decoration:none;font-size:.95rem;padding:8px 12px;border-radius:10px;border:1px solid var(--line);transition:background .15s}.back:hover{background:var(--bg-soft)}.title{font-size:1.4rem;font-weight:900;margin:0}.hud{display:flex;gap:10px;justify-content:center;margin-bottom:18px;flex-wrap:wrap}.pill{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:8px 14px;text-align:center;min-width:76px}.pill .k{display:block;font-size:.64rem;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}.pill .v{font-size:1.25rem;font-weight:800}.panel{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:16px}.panel h2{margin:0 0 6px;font-size:1.3rem}.panel p.lead{color:var(--muted);margin:0 0 18px;line-height:1.5}.diff-picker{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:18px 0}.diff-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:16px 10px;cursor:pointer;color:var(--text);display:flex;flex-direction:column;align-items:center;gap:4px;transition:border-color .12s,background .12s,transform .08s}.diff-card:active{transform:scale(.97)}@media(hover:hover){.diff-card:hover{border-color:var(--accent)}}.diff-card.active{border-color:var(--accent);background:#2a2740}.diff-card .d-label{font-weight:800;font-size:1.05rem}.diff-card .d-wpm{font-size:.75rem;color:var(--muted)}.diff-card.active .d-wpm{color:var(--accent)}.reader-wrap{text-align:center}.reader-frame{position:relative;background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:46px 20px;margin-bottom:14px}.guide-top,.guide-bottom{position:absolute;left:50%;width:2px;height:14px;background:var(--accent);opacity:.6;transform:translate(-50%)}.guide-top{top:20px}.guide-bottom{bottom:20px}.reader{display:grid;grid-template-columns:1fr auto 1fr;align-items:baseline;font-size:clamp(2rem,8vw,3.2rem);font-weight:800;font-family:SF Mono,ui-monospace,Cascadia Code,Menlo,Consolas,monospace;letter-spacing:.5px;min-height:1.4em}.reader .left{text-align:right}.reader .pivot{text-align:center;color:var(--pivot);padding:0 1px}.reader .right{text-align:left}.progress{height:8px;border-radius:999px;background:var(--bg-soft);border:1px solid var(--line);overflow:hidden;margin-bottom:16px}.progress>span{display:block;height:100%;width:0%;background:var(--accent);transition:width .1s linear}.controls-row{display:flex;gap:10px;justify-content:center}.question{margin-bottom:20px}.question .qtext{font-weight:800;font-size:1.1rem;margin-bottom:12px}.options{display:grid;gap:10px}.option{text-align:left;background:var(--bg-soft);border:1px solid var(--line);color:var(--text);padding:13px 16px;border-radius:12px;cursor:pointer;font-size:1rem;transition:border-color .12s,background .12s}.option.selected{border-color:var(--accent);background:#2a2740}@media(hover:hover){.option:hover{border-color:var(--accent)}}.option.correct{border-color:var(--good);background:#4ecdc426}.option.wrong{border-color:var(--pivot);background:#ff6b6b26}.option:disabled{cursor:default}.btn{border:none;background:var(--accent);color:#10131c;font-weight:800;font-size:1.05rem;padding:14px 26px;border-radius:12px;cursor:pointer;transition:transform .1s,filter .12s}.btn:hover{filter:brightness(1.08)}.btn:active{transform:scale(.97)}.btn.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn.full{width:100%}.center{text-align:center}.hint{color:var(--muted);font-size:.9rem}.hidden{display:none!important}.overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0a0c12d1;display:grid;place-items:center;padding:20px;overflow:auto;z-index:60;opacity:0;pointer-events:none;transition:opacity .2s}.overlay.show{opacity:1;pointer-events:auto}.modal{background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;text-align:center;max-width:400px;width:100%;max-height:92vh;overflow:auto;box-shadow:var(--shadow);transform:translateY(10px) scale(.98);transition:transform .2s}.overlay.show .modal{transform:translateY(0) scale(1)}.modal h2{margin:0 0 4px;font-size:1.7rem}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}.stat-box{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:12px}.stat-box .n{font-size:1.6rem;font-weight:900}.stat-box .l{font-size:.68rem;text-transform:uppercase;letter-spacing:1px;color:var(--muted)}.speed-change{font-weight:800;margin:6px 0}.speed-change.up{color:var(--good)}.speed-change.down{color:var(--warn)}.newbest{color:var(--accent);font-weight:800;margin:4px 0 0}.row{display:flex;gap:10px;margin-top:18px}.row .btn{flex:1}.countdown{font-size:5rem;font-weight:900;color:var(--accent);text-align:center;min-height:1.2em}.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%) translateY(20px);background:var(--bg-card);border:1px solid var(--line);padding:12px 22px;border-radius:12px;font-weight:700;box-shadow:var(--shadow);opacity:0;transition:opacity .2s,transform .2s;pointer-events:none;z-index:70}.toast.show{opacity:1;transform:translate(-50%) translateY(0)}@media(max-width:380px){.title{font-size:1.2rem}.panel{padding:18px}.diff-picker{gap:8px}.diff-card{padding:14px 6px}.reader-frame{padding:40px 12px}.stat-grid{gap:8px}}