:root{--bg:#f6f7fb;--card:#ffffff;--text:#1c2430;--muted:#667085;--line:#e4e7ec;--brand:#3b5bdb;--brand-text:#ffffff;--again:#e03131;--hard:#f08c00;--good:#2f9e44;--easy:#1c7ed6;color-scheme:light dark}@media (prefers-color-scheme:dark){:root{--bg:#10141c;--card:#18202c;--text:#e8ecf3;--muted:#9aa5b5;--line:#2a3445;--brand:#7c97ff;--brand-text:#10141c}}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5;-webkit-text-size-adjust:100%}.wrap{max-width:720px;margin:0 auto;padding:16px 16px 48px}.topbar{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.brand{font-size:20px;font-weight:700}.tabs{display:flex;gap:6px;margin-bottom:16px;overflow-x:auto}.tab{flex:1 1;min-width:max-content;padding:10px;border:1px solid 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