:root{--bg: #f6f7fb;--surface: #ffffff;--surface-2: #f0f2f7;--text: #1f2330;--muted: #6b7280;--border: #e5e7eb;--accent: #6366f1;--accent-dark: #4f46e5;--again: #ef4444;--hard: #f59e0b;--good: #10b981;--easy: #3b82f6;--shadow: 0 1px 3px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .06);--radius: 14px}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.5}.app{min-height:100%;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:#ffffffd9;-webkit-backdrop-filter:saturate(180%) blur(10px);backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid 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