:root{--bg: #f5f7fa;--surface: #ffffff;--surface-soft: #fafbfc;--text: #1f2937;--text-soft: #6b7280;--text-muted: #c8d0db;--border: #e5e9f0;--shadow: 0 1px 3px rgba(15, 23, 42, .04), 0 4px 16px rgba(15, 23, 42, .04);--shadow-md: 0 4px 12px rgba(15, 23, 42, .05), 0 12px 28px rgba(15, 23, 42, .06);--accent: #e74c3c;--accent-soft: rgba(231, 76, 60, .08);--blue: #3b82f6;--blue-soft: rgba(59, 130, 246, .08);--amber: #f59e0b;--amber-soft: rgba(245, 158, 11, .08);--green: #10b981;--green-soft: rgba(16, 185, 129, .08);--radius: 14px;--radius-lg: 20px;--radius-xl: 24px}@media (prefers-color-scheme: dark){:root{--bg: #0d1117;--surface: #161b22;--surface-soft: #1a2029;--text: #e6edf3;--text-soft: #8b949e;--text-muted: #484f58;--border: #21262d;--shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4), 0 16px 36px rgba(0, 0, 0, .35);--accent-soft: rgba(231, 76, 60, .16);--blue-soft: rgba(59, 130, 246, .16);--amber-soft: rgba(245, 158, 11, .16);--green-soft: rgba(16, 185, 129, .16)}}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-feature-settings:"tnum" 1;line-height:1.5}button{font-family:inherit}.app{min-height:100vh;max-width:1500px;margin:0 auto;padding:28px 32px 36px;display:flex;flex-direction:column;gap:22px}.app-header{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}.brand{display:flex;align-items:center;gap:14px}.brand .logo{font-size:32px;width:52px;height:52px;background:var(--surface);border-radius:14px;display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow);border:1px solid var(--border)}.brand-text h1{margin:0;font-size:22px;font-weight:600;letter-spacing:.3px}.brand-sub{margin:2px 0 0;font-size:13px;color:var(--text-soft)}.header-meta{display:inline-flex;align-items:center;gap:20px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:10px 18px;box-shadow:var(--shadow)}.meta-item{display:flex;flex-direction:column;align-items:flex-start;line-height:1.2}.meta-label{font-size:11px;color:var(--text-soft);letter-spacing:.5px;text-transform:uppercase}.meta-value{font-size:16px;font-weight:600;margin-top:2px}.meta-divider{width:1px;align-self:stretch;background:var(--border);margin:4px 0}.dashboard{display:grid;gap:20px;grid-template-columns:1fr}@media (min-width: 880px){.dashboard{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);grid-template-areas:"stats  stats" "timer  todos" "chart  chart"}.dashboard>.stats-row{grid-area:stats}.dashboard>.card.timer{grid-area:timer}.dashboard>.card.todos{grid-area:todos}.dashboard>.chart-card{grid-area:chart}}@media (min-width: 1280px){.dashboard{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr) minmax(0,1.05fr);grid-template-areas:"stats stats stats" "timer todos chart"}}.card{background:var(--surface);border-radius:var(--radius-lg);padding:24px;box-shadow:var(--shadow);border:1px solid var(--border)}.card-header{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:18px}.card-header h2{margin:0;font-size:16px;font-weight:600}.card-sub{margin:4px 0 0;font-size:12px;color:var(--text-soft)}.link-btn{border:none;background:none;color:var(--text-soft);cursor:pointer;font-size:13px;padding:6px 10px;border-radius:8px;transition:color .15s ease,background .15s ease}.link-btn:hover{color:var(--accent);background:var(--accent-soft)}.stats-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:14px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:18px 20px;display:flex;gap:14px;align-items:center;box-shadow:var(--shadow);position:relative;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-card:after{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--accent);opacity:0;transition:opacity .2s ease}.stat-card:hover:after{opacity:1}.stat-card.tone-red:after{background:var(--accent)}.stat-card.tone-blue:after{background:var(--blue)}.stat-card.tone-amber:after{background:var(--amber)}.stat-card.tone-green:after{background:var(--green)}.stat-card-icon{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.tone-red .stat-card-icon{background:var(--accent-soft)}.tone-blue .stat-card-icon{background:var(--blue-soft)}.tone-amber .stat-card-icon{background:var(--amber-soft)}.tone-green 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