* {
    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;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    max-width: 800px;
    width: 100%;
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 40px 30px;
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.refresh-info {
    font-size: 1.1rem;
    opacity: 0.9;
    margin-bottom: 15px;
}

.countdown {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 10px 25px;
    border-radius: 50px;
    font-size: 1.5rem;
    font-weight: bold;
    backdrop-filter: blur(10px);
}

main {
    padding: 40px 30px;
}

section {
    margin-bottom: 40px;
}

section h2 {
    color: #333;
    font-size: 1.8rem;
    margin-bottom: 20px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

.ad-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.ad-container {
    background: #f8f9fa;
    border: 2px dashed #667eea;
    border-radius: 10px;
    padding: 40px;
    text-align: center;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.ad-button {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    text-decoration: none;
    padding: 20px 40px;
    border-radius: 50px;
    font-size: 1.3rem;
    font-weight: 600;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.ad-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.ad-button:active {
    transform: translateY(-1px);
}

.info-section p {
    color: #555;
    line-height: 1.8;
    font-size: 1.05rem;
    margin-bottom: 15px;
}

footer {
    background: #f8f9fa;
    text-align: center;
    padding: 20px;
    color: #666;
    border-top: 1px solid #e9ecef;
}

@media (max-width: 600px) {
    header h1 {
        font-size: 1.8rem;
    }
    
    .countdown {
        font-size: 1.2rem;
        padding: 8px 20px;
    }
    
    main {
        padding: 30px 20px;
    }
    
    section h2 {
        font-size: 1.5rem;
    }
    
    .ad-grid {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 601px) and (max-width: 900px) {
    .ad-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}