:root {
            --bg-color: #0f172a;
            --card-bg: #1e293b;
            --accent-color: #3b82f6;
            --accent-success: #10b981;
            --accent-warning: #f59e0b;
            --accent-danger: #ef4444;
            --text-main: #f8fafc;
            --text-muted: #94a3b8;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            background-color: var(--bg-color);
            color: var(--text-main);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }

        .container {
            max-width: 800px;
            width: 100%;
            background: var(--card-bg);
            padding: 40px;
            border-radius: 24px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            text-align: center;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        h1 {
            font-size: 2.5rem;
            margin-bottom: 10px;
            font-weight: 700;
            background: linear-gradient(to right, #3b82f6, #8b5cf6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        p.subtitle {
            color: var(--text-muted);
            margin-bottom: 40px;
            font-size: 1.1rem;
        }

        .dashboard {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 40px;
        }

        .card {
            background: rgba(15, 23, 42, 0.6);
            padding: 25px;
            border-radius: 16px;
            border: 1px solid rgba(255, 255, 255, 0.05);
            transition: transform 0.3s ease;
        }

        .card:hover {
            transform: translateY(-5px);
        }

        .card-title {
            font-size: 0.9rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-muted);
            margin-bottom: 10px;
        }

        .card-value {
            font-size: 2.5rem;
            font-weight: 700;
            color: var(--text-main);
        }

        .card-unit {
            font-size: 1rem;
            color: var(--text-muted);
            font-weight: 400;
            margin-left: 4px;
        }

        .status-good { color: var(--accent-success); }
        .status-warn { color: var(--accent-warning); }
        .status-bad { color: var(--accent-danger); }

        .btn {
            background: linear-gradient(135deg, #3b82f6, #1d4ed8);
            color: white;
            border: none;
            padding: 16px 40px;
            font-size: 1.2rem;
            font-weight: 600;
            border-radius: 50px;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 10px 20px rgba(59, 130, 246, 0.3);
            outline: none;
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 15px 25px rgba(59, 130, 246, 0.4);
            background: linear-gradient(135deg, #2563eb, #1e40af);
        }

        .btn:active {
            transform: translateY(1px);
        }

        .btn:disabled {
            background: #475569;
            color: #94a3b8;
            cursor: not-allowed;
            box-shadow: none;
            transform: none;
        }

        .chart-container {
            margin-top: 30px;
            height: 60px;
            display: flex;
            align-items: flex-end;
            justify-content: center;
            gap: 4px;
            padding: 0 10px;
        }

        .bar {
            flex: 1;
            background: rgba(59, 130, 246, 0.2);
            border-radius: 4px 4px 0 0;
            transition: height 0.3s ease, background 0.3s ease;
            height: 10%;
        }

        .bar.active {
            background: var(--accent-color);
        }