:root{--bg: #fafaf8;--surface: #ffffff;--ink: #16161a;--ink-soft: #6b6b73;--ink-faint: #a2a2ab;--line: #e6e6e1;--line-strong: #d3d3cc;--accent: #16161a;--correct: #2f7d55;--wrong: #b4453c;--radius: 14px;--radius-sm: 10px;--shadow: 0 1px 2px rgba(20, 20, 25, .04), 0 8px 24px rgba(20, 20, 25, .05);--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;--mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%}body{background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}#app{height:100dvh;display:flex;flex-direction:column;max-width:1180px;margin:0 auto;padding:0 20px;overflow:hidden}.topbar{position:relative;display:flex;align-items:center;justify-content:center;gap:16px;padding:22px 0 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