:root{--bg: #f6f5f1;--card: #ffffff;--ink: #2b2b2b;--muted: #8a8a8a;--accent: #e2574c;--accent-soft: #fdeceb;--green: #4caf7d;--border: #e8e5de}*{box-sizing:border-box}body{margin:0;font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,system-ui,sans-serif;background:var(--bg);color:var(--ink)}#app{max-width:640px;margin:0 auto;padding:24px 16px 64px}h1{font-size:22px;margin:0 0 4px}.subtitle{color:var(--muted);font-size:13px;margin:0 0 20px}.tabs{display:flex;gap:8px;margin-bottom:20px}.tabs button{flex:1;padding:10px 0;border:1px solid var(--border);background:var(--card);border-radius:10px;font-size:15px;cursor:pointer;color:var(--ink)}.tabs button.active{background:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px;margin-bottom:16px}.timer-display{font-size:64px;font-weight:700;text-align:center;font-variant-numeric:tabular-nums;letter-spacing:2px;margin:8px 0}.timer-display.running{color:var(--accent)}.timer-display.break{color:var(--green)}.status-line{text-align:center;color:var(--muted);margin-bottom:12px}.tags{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}.tag{padding:6px 16px;border-radius:999px;border:1px solid var(--border);background:#fff;cursor:pointer;font-size:14px}.tag.selected{background:var(--accent-soft);border-color:var(--accent);color:var(--accent);font-weight:600}.btn-row{display:flex;gap:10px;justify-content:center}.btn{padding:10px 24px;border-radius:10px;border:none;cursor:pointer;font-size:15px;background:var(--accent);color:#fff;font-weight:600}.btn.secondary{background:#fff;color:var(--ink);border:1px solid var(--border);font-weight:400}.btn:disabled{opacity:.5;cursor:not-allowed}.log-entry{padding:12px 0;border-bottom:1px dashed var(--border)}.log-entry:last-child{border-bottom:none}.log-time{color:var(--muted);font-size:12px}.log-note{font-size:15px;margin-top:2px}.log-tag{display:inline-block;font-size:12px;color:var(--accent);background:var(--accent-soft);border-radius:4px;padding:1px 6px;margin-left:6px}.empty{color:var(--muted);text-align:center;padding:24px 0;font-size:14px}.aggregate{display:flex;gap:16px;margin-bottom:16px}.aggregate .stat{flex:1;text-align:center}.aggregate .num{font-size:24px;font-weight:700;color:var(--accent)}.aggregate .lbl{font-size:12px;color:var(--muted)}.modal-mask{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;display:flex;align-items:center;justify-content:center;z-index:10}.modal{background:#fff;border-radius:14px;padding:24px;width:90%;max-width:420px}.modal h3{margin:0 0 6px}.modal p{color:var(--muted);font-size:13px;margin:0 0 12px}.modal textarea{width:100%;min-height:80px;border:1px solid var(--border);border-radius:10px;padding:10px;font-size:15px;font-family:inherit;resize:vertical}.modal textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}.modal .err{color:var(--accent);font-size:12px;margin-top:6px}.export-btn{margin-top:4px}.week-nav{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.week-nav button{border:1px solid var(--border);background:#fff;border-radius:8px;padding:4px 12px;cursor:pointer}.demo-hint{font-size:12px;color:var(--muted);text-align:center;margin-top:10px}