.stopwatch-display {
            background: #f8f9fc;
            border-radius: 2rem;
            padding: 1.5rem;
            text-align: center;
            font-family: 'Courier New', 'SF Mono', 'Fira Code', monospace;
            font-size: 4rem;
            font-weight: 700;
            letter-spacing: 0.05em;
            color: #0a2b3e;
            border: 1px solid rgba(70, 130, 180, 0.2);
            box-shadow: 0 8px 20px rgba(0,0,0,0.05);
            margin-bottom: 1.5rem;
        }
        @media (max-width: 768px) {
            .stopwatch-display { font-size: 2.2rem; padding: 1rem; }
        }
        .btn-stopwatch {
            min-width: 100px;
            margin: 0.25rem;
            font-weight: 500;
            transition: all 0.2s;
        }
        .lap-table {
            max-height: 280px;
            overflow-y: auto;
            font-size: 0.9rem;
        }
        .lap-table table {
            margin-bottom: 0;
        }
        .lap-table th {
            background-color: rgba(70, 130, 180, 0.1);
            position: sticky;
            top: 0;
        }
        .key-hint {
            font-size: 0.7rem;
            background: #eef2f5;
            border-radius: 12px;
            padding: 2px 8px;
            display: inline-block;
            margin-left: 6px;
            font-family: monospace;
        }
        .precision-badge {
            background: #e6f4ea;
            color: #2e6b3e;
            border-radius: 40px;
            padding: 0.2rem 0.8rem;
            font-size: 0.75rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .action-group {
            border-top: 1px solid #e9ecef;
            margin-top: 1rem;
            padding-top: 1rem;
        }
        .copy-toast {
            position: fixed;
            bottom: 20px;
            right: 20px;
            z-index: 1090;
            background: #1e2a3a;
            color: white;
            padding: 8px 16px;
            border-radius: 40px;
            font-size: 0.85rem;
            opacity: 0;
            transition: opacity 0.3s;
            pointer-events: none;
        }
        .copy-toast.show {
            opacity: 1;
        }
        .stats-note {
            background: #f1f6fa;
            border-radius: 12px;
            padding: 1rem;
            margin-top: 1rem;
        }