/* ============================================
   Demo Video Section - Dark with Glow
   ============================================ */

.demo-section {
    padding: var(--spacing-4xl) 0;
    background: linear-gradient(180deg, var(--color-dark-bg) 0%, var(--color-dark-surface) 50%, var(--color-dark-bg) 100%);
    color: var(--color-text-on-primary);
    position: relative;
    overflow: hidden;
}

.demo-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 400px;
    background: radial-gradient(ellipse, rgba(59, 130, 246, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.demo-section .section-title {
    color: #FFFFFF;
}

.demo-section .section-subtitle {
    color: rgba(226, 232, 240, 0.75);
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
    position: relative;
}

/* Video Card */
.video-card {
    background: rgba(30, 41, 59, 0.6);
    border-radius: var(--border-radius-xl);
    overflow: hidden;
    transition: all var(--transition-base);
    border: 1px solid rgba(59, 130, 246, 0.12);
    backdrop-filter: blur(10px);
}

.video-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3), 0 0 30px rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
}

/* Video Embed Container */
.video-embed {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-dark-surface);
    overflow: hidden;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    height: 100%;
    cursor: pointer;
}

.video-thumbnail .placeholder-video {
    width: 100%;
    height: 100%;
    border-radius: 0;
    border: none;
}

/* Play Button */
.play-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: none;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 2;
}

.play-btn:hover {
    transform: translate(-50%, -50%) scale(1.1);
}

.play-btn svg circle {
    transition: fill var(--transition-base);
}

.play-btn:hover svg circle {
    fill: rgba(255, 255, 255, 1);
}

/* Video iframe (loaded dynamically) */
.video-embed iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Video Info */
.video-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: #FFFFFF;
    margin: var(--spacing-md) var(--spacing-md) var(--spacing-xs);
}

.video-description {
    font-size: var(--font-size-sm);
    color: rgba(226, 232, 240, 0.6);
    margin: 0 var(--spacing-md) var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

/* Responsive */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Show only 2 videos, hide 3rd on tablet */
    .video-card:nth-child(3) {
        display: none;
    }
}

@media (max-width: 768px) {
    .demo-section {
        padding: var(--spacing-3xl) 0;
    }

    .video-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    /* Show all videos on mobile, stacked */
    .video-card:nth-child(3) {
        display: block;
    }

    .video-title {
        font-size: var(--font-size-md);
    }
}

@media (max-width: 480px) {
    .demo-section {
        padding: var(--spacing-2xl) 0;
    }

    .play-btn svg {
        width: 48px;
        height: 48px;
    }
}