*{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2563eb;--primary-dark: #1d4ed8;--bg: #f5f7fa;--card: #ffffff;--text: #1f2937;--muted: #6b7280;--border: #e5e7eb;--danger: #ef4444;--success: #10b981}html,body,#root{height:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased}.app{max-width:720px;margin:0 auto;min-height:100%;display:flex;flex-direction:column;background:var(--bg)}.topbar{background:var(--primary);color:#fff;padding:14px 16px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:10}.topbar h1{font-size:18px;font-weight:600}.sync-status{font-size:12px;opacity:.9;display:flex;align-items:center;gap:6px}.sync-dot{width:8px;height:8px;border-radius:50%;background:#fff}.sync-dot.syncing{animation:pulse 1s infinite}.sync-dot.error{background:#fecaca}@keyframes pulse{0%,to{opacity:1}50%{opacity:.3}}.content{flex:1;padding:16px 16px 80px}.card{background:var(--card);border-radius:12px;padding:16px;box-shadow:0 1px 3px #0000000f;margin-bottom:16px}label{display:block;font-size:13px;color:var(--muted);margin-bottom:4px;margin-top:12px}input[type=datetime-local],input[type=date],input[type=text],input[type=number]{width:100%;padding:10px 12px;border:1px solid var(--border);border-radius:8px;font-size:15px;background:#fff}input:focus{outline:none;border-color:var(--primary)}.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 16px;border:none;border-radius:8px;font-size:15px;font-weight:500;cursor:pointer;transition:background .15s}.btn-primary{background:var(--primary);color:#fff;width:100%;margin-top:16px}.btn-primary:hover{background:var(--primary-dark)}.btn-ghost{background:#f3f4f6;color:var(--text)}.btn-danger{background:var(--danger);color:#fff}.result-box{background:#eff6ff;border:1px solid #bfdbfe;border-radius:10px;padding:16px;text-align:center;margin-top:16px}.result-box .duration{font-size:32px;font-weight:700;color:var(--primary-dark);letter-spacing:2px}.result-box .label{font-size:12px;color:var(--muted);margin-top:4px}.record-item{background:var(--card);border-radius:10px;padding:12px 14px;margin-bottom:10px;display:flex;justify-content:space-between;align-items:center;box-shadow:0 1px 2px #0000000a}.record-item .info{flex:1}.record-item .time-range{font-size:14px;font-weight:500}.record-item .meta{font-size:12px;color:var(--muted);margin-top:2px}.record-item .dur{font-size:16px;font-weight:600;color:var(--primary);margin-right:12px}.del-btn{background:none;border:none;color:var(--danger);font-size:18px;cursor:pointer;padding:4px 8px}.empty{text-align:center;color:var(--muted);padding:40px 0}.tabbar{position:fixed;bottom:0;left:0;right:0;max-width:720px;margin:0 auto;background:#fff;border-top:1px solid var(--border);display:flex;padding:6px 0;z-index:10}.tabbar button{flex:1;background:none;border:none;padding:8px 4px;font-size:11px;color:var(--muted);cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:2px}.tabbar button.active{color:var(--primary)}.tabbar .icon{font-size:20px}.calendar-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:4px;margin-top:12px}.cal-head{text-align:center;font-size:12px;color:var(--muted);padding:6px 0}.cal-day{aspect-ratio:1;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:14px;cursor:pointer;background:#f9fafb}.cal-day.has-record{background:#dbeafe;color:var(--primary-dark);font-weight:600}.cal-day.today{border:2px solid var(--primary)}.cal-day.other-month{color:#d1d5db}.stat-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}.stat-item{background:var(--card);border-radius:10px;padding:16px;text-align:center}.stat-item .value{font-size:22px;font-weight:700;color:var(--primary-dark)}.stat-item .name{font-size:12px;color:var(--muted);margin-top:4px}.month-nav{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.month-nav button{background:#f3f4f6;border:none;width:32px;height:32px;border-radius:8px;cursor:pointer;font-size:16px}.month-nav .title{font-weight:600}.filter-row{display:flex;gap:8px;margin-bottom:12px}.filter-row input{flex:1}