:root{--bg: #0d1117;--surface: #161b22;--surface-2: #1b2230;--border: #283040;--border-bright: #3a4456;--text: #e6edf3;--dim: #8b97a6;--dim-2: #5d6878;--accent: #7c9cff;--accent-soft: rgba(124, 156, 255, .12);--again: #f0656e;--good: #e2b341;--easy: #4ec9a5;--font-display: "Space Grotesk", system-ui, sans-serif;--font-body: "Inter", system-ui, sans-serif;--font-mono: "JetBrains Mono", ui-monospace, monospace;--radius: 14px;--radius-sm: 9px;--maxw: 880px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:var(--font-body);-webkit-font-smoothing:antialiased;line-height:1.55}#root{min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:inherit;cursor:pointer}::selection{background:var(--accent-soft)}@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}.app{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;gap:20px;padding:14px clamp(16px,4vw,40px);background:#0d1117d1;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:baseline;gap:9px;font-family:var(--font-display);font-weight:700;font-size:17px;letter-spacing:-.01em}.brand .tag{font-family:var(--font-mono);font-size:11px;font-weight:500;color:var(--accent);border:1px solid var(--border-bright);border-radius:6px;padding:1px 6px}.nav{display:flex;gap:4px;margin-left:auto;background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:4px}.nav a{font-family:var(--font-mono);font-size:13px;font-weight:500;color:var(--dim);padding:6px 14px;border-radius:7px;transition:color .15s,background .15s}.nav a:hover{color:var(--text)}.nav a.active{color:var(--text);background:var(--surface-2)}.nav-sep{width:1px;background:var(--border);margin:4px 2px;align-self:stretch;border-radius:1px}.page{flex:1;width:100%;max-width:var(--maxw);margin:0 auto;padding:clamp(20px,4vw,40px) clamp(16px,4vw,40px) 80px}.page-head{margin-bottom:24px}.page-head h1{font-family:var(--font-display);font-weight:700;font-size:clamp(26px,5vw,36px);letter-spacing:-.02em;margin:0 0 6px}.page-head p{color:var(--dim);margin:0;font-size:15px}.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:10px}.progress-shell{margin:14px 0 4px}.progress-track{height:6px;background:var(--surface-2);border-radius:99px;overflow:hidden}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),var(--easy));border-radius:99px;transition:width .3s 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cubic-bezier(.4,.2,.2,1);transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.face{position:absolute;top:0;right:0;bottom:0;left:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:18px;border:1px solid var(--border-bright);background:var(--surface);padding:clamp(22px,4vw,34px);display:flex;flex-direction:column}.face.back{transform:rotateY(180deg);background:linear-gradient(160deg,var(--surface),var(--surface-2));border-color:#4ec9a559}.face-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.07em;text-transform:uppercase;color:var(--dim)}.face.back .face-label{color:var(--easy)}.face-q{font-family:var(--font-display);font-size:clamp(18px,3.4vw,23px);font-weight:600;line-height:1.32;letter-spacing:-.01em;margin:auto 0}.face-a{font-size:clamp(15px,2.6vw,17px);color:#d6deea;margin:auto 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