:root{--blue: #3b82f6;--green: #22c55e;--amber: #f59e0b;--red: #ef4444;--ink: #1f2937;--muted: #6b7280;--bg: #f3f4f6;--card: #ffffff;--radius: 14px}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased}#app{max-width:720px;margin:0 auto;padding:16px 16px 48px}.card{background:var(--card);border-radius:var(--radius);padding:16px;margin-bottom:12px;box-shadow:0 1px 3px #0000000f}.btn{display:block;width:100%;border:none;border-radius:12px;padding:14px;font-size:17px;font-weight:600;background:var(--blue);color:#fff;cursor:pointer}.btn:disabled{opacity:.4}.btn.secondary{background:#e5e7eb;color:var(--ink)}.btn.green{background:var(--green)}.field{width:100%;border:1.5px solid #d1d5db;border-radius:12px;padding:13px;font-size:17px;outline:none}.field:focus{border-color:var(--blue)}.error-text{color:var(--red);font-size:14px;margin:8px 0 0}.hint{color:var(--muted);font-size:14px}.title{font-size:24px;font-weight:700;margin:12px 0 4px}.subtitle{color:var(--muted);margin-bottom:16px}.offline-banner{background:var(--amber);color:#fff;text-align:center;font-size:13px;padding:6px;border-radius:0 0 10px 10px}.skeleton{background:linear-gradient(90deg,#e5e7eb 25%,#f3f4f6,#e5e7eb 75%);background-size:200% 100%;animation:shimmer 1.2s infinite;border-radius:10px}@keyframes shimmer{to{background-position:-200% 0}}.dot{display:inline-block;width:10px;height:10px;border-radius:50%;margin-right:6px}.dot.GRAY{background:#9ca3af}.dot.RED{background:var(--red)}.dot.YELLOW{background:var(--amber)}.dot.GREEN{background:var(--green)}