:root {
    --gold: #D4AF37;
    --dark-gold: #B4941E;
    --black: #000000;
    --white: #ffffff;
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background-color: var(--black);
    color: var(--white);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 3rem;
    font-weight: 900;
    margin-bottom: 1rem;
    letter-spacing: 2px;
}

.gold-band {
    background-color: var(--gold);
    padding: 1rem;
    margin: 1rem 0;
}

.gold-band h2 {
    color: var(--black);
    font-size: 1.5rem;
    font-weight: 700;
}

main {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 2rem;
}

.hero-section {
    position: relative;
}

.featured-video {
    position: relative;
    background: #111;
    border-radius: 15px;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.instructor-silhouette {
    position: absolute;
    width: 100%;
    height: 100%;
    opacity: 0.3;
}

.play-button {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: var(--gold);
    border: none;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}

.play-button:hover {
    background-color: var(--dark-gold);
    transform: translate(-50%, -50%) scale(1.1);
}

.play-button svg {
    width: 40px;
    height: 40px;
    color: var(--black);
}

.lesson-info {
    margin-top: 1.5rem;
}

.lesson-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
}

.lesson-subtitle {
    color: var(--gold);
    font-size: 1.5rem;
    font-weight: 700;
}

.lessons-sidebar {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.lesson-item {
    background-color: #111;
    border-radius: 10px;
    padding: 1rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.lesson-item:hover {
    background-color: #222;
}

.lesson-item.active {
    background-color: #222;
    border: 1px solid var(--gold);
}

.lesson-thumbnail {
    width: 60px;
    height: 60px;
    background-color: #333;
    border-radius: 5px;
    overflow: hidden;
}

.lesson-details h4 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.duration {
    color: var(--gold);
    font-size: 0.875rem;
}

@media (max-width: 768px) {
    main {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .lesson-title {
        font-size: 2rem;
    }
}

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

.hero-section, .lesson-item {
    animation: fadeIn 0.6s ease-out forwards;
}