* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 20px;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
        }

        h1 {
            text-align: center;
            color: white;
            font-size: 42px;
            margin-bottom: 40px;
            text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
        }

        .countdown-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-bottom: 30px;
        }

        .countdown-card {
            background: rgba(255, 255, 255, 0.95);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
            text-align: center;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .countdown-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
        }

        .countdown-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 5px;
            background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
        }

        .countdown-icon {
            font-size: 48px;
            margin-bottom: 15px;
        }

        .countdown-title {
            font-size: 24px;
            color: #333;
            margin-bottom: 10px;
            font-weight: 600;
        }

        .countdown-date {
            font-size: 14px;
            color: #888;
            margin-bottom: 20px;
        }

        .countdown-display {
            display: flex;
            justify-content: space-around;
            gap: 10px;
            margin-bottom: 15px;
        }

        .time-unit {
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .time-value {
            font-size: 32px;
            font-weight: bold;
            color: #667eea;
            line-height: 1;
        }

        .time-label {
            font-size: 12px;
            color: #666;
            margin-top: 5px;
            text-transform: uppercase;
        }

        .countdown-message {
            font-size: 18px;
            color: #4ECDC4;
            font-weight: 600;
            padding: 10px;
            background: rgba(78, 205, 196, 0.1);
            border-radius: 8px;
        }

        .back-button {
            text-align: center;
            margin-top: 20px;
        }

        .btn {
            padding: 12px 30px;
            background: rgba(255, 255, 255, 0.95);
            color: #667eea;
            border: none;
            border-radius: 8px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
        }

        .btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.2);
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 32px;
                margin-bottom: 30px;
            }

            .countdown-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }

            .countdown-card {
                padding: 25px;
            }

            .countdown-icon {
                font-size: 40px;
            }

            .countdown-title {
                font-size: 20px;
            }

            .time-value {
                font-size: 28px;
            }
        }

        @media (max-width: 480px) {
            body {
                padding: 15px;
            }

            h1 {
                font-size: 26px;
            }

            .countdown-card {
                padding: 20px;
            }

            .time-value {
                font-size: 24px;
            }

            .countdown-display {
                gap: 5px;
            }
        }