* {
    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;
    color: #333;
}

.container {
    max-width: 1200px;
    width: 100%;
    background: white;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    overflow: hidden;
    animation: fadeIn 0.8s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    font-weight: 700;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.2em;
    opacity: 0.95;
    font-weight: 300;
}

main {
    padding: 40px 30px;
}

.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%; /* 16:9 비율 */
    height: 0;
    overflow: hidden;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    background: #000;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-container video {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
    background: #000;
}

.video-overlay {
    position: absolute;
    inset: auto;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    padding: 12px 18px;
    border-radius: 999px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    backdrop-filter: blur(6px);
}

.video-overlay:hover {
    background: rgba(0, 0, 0, 0.7);
}

.video-overlay[hidden] {
    display: none;
}

footer {
    background: #f8f9fa;
    padding: 20px 30px;
    text-align: center;
    color: #666;
    font-size: 0.9em;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }
    
    .subtitle {
        font-size: 1em;
    }
    
    main {
        padding: 20px 15px;
    }
    
    footer {
        padding: 15px;
        font-size: 0.8em;
    }
}

@media (max-width: 480px) {
    header {
        padding: 30px 20px;
    }
    
    header h1 {
        font-size: 1.5em;
    }
    
    .subtitle {
        font-size: 0.9em;
    }
}