:root {
            --concrete-100: #f2f2f2;
            --concrete-200: #e0e0e0;
            --concrete-300: #b8b8b8;
            --concrete-400: #8c8c8c;
            --concrete-500: #666666;
            --concrete-700: #333333;
            --concrete-900: #1a1a1a;
            --accent: #ff4d00;
            --noise: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            -webkit-font-smoothing: antialiased;
        }

        body {
            background-color: var(--concrete-100);
            color: var(--concrete-900);
            font-family: 'Inter', sans-serif;
            line-height: 1.6;
            overflow-x: hidden;
        }

        body::before {
            content: "";
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: var(--noise);
            opacity: 0.04;
            pointer-events: none;
            z-index: 9999;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Navigation */
        nav {
            padding: 20px 0;
            border-bottom: 2px solid var(--concrete-400);
            background: var(--concrete-100);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .nav-inner {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            font-weight: 900;
            text-transform: uppercase;
            font-size: 1.2rem;
            letter-spacing: -0.05em;
            text-decoration: none;
            color: inherit;
        }

        .nav-back {
            font-weight: 700;
            text-decoration: none;
            color: var(--concrete-900);
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
        }

        .nav-back:hover {
            color: var(--accent);
        }

        /* Video Hero Section */
        .video-hero {
            background: var(--concrete-900);
            color: white;
            padding: 40px 0;
        }

        .video-title {
            font-family: 'Archivo Black', sans-serif;
            font-size: clamp(1.5rem, 3vw, 2.5rem);
            line-height: 1.1;
            margin-bottom: 20px;
            text-transform: uppercase;
        }

        .video-meta {
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.9rem;
            color: var(--concrete-300);
            margin-bottom: 20px;
            display: flex;
            gap: 20px;
        }

        /* Responsive Grid for Content */
        .content-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 40px;
            margin-top: 40px;
        }

        /* Video Container */
        .video-container {
            position: relative;
            padding-bottom: 56.25%;
            /* 16:9 */
            height: 0;
            background: #000;
            border: 2px solid var(--concrete-400);
            box-shadow: 8px 8px 0px var(--concrete-500);
            margin-bottom: 30px;
        }

        .video-container iframe {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
        }

        /* Transcript / Topics Section (Sidebar) */
        .transcript-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 15px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--concrete-900);
        }

        .transcript-title {
            font-family: 'Archivo Black', sans-serif;
            font-size: 1.2rem;
            text-transform: uppercase;
            color: var(--concrete-900);
        }

        .transcript-container {
            height: 600px;
            overflow-y: auto;
            background: #fff;
            border: 2px solid var(--concrete-300);
            /* Scrollbar styling */
            scrollbar-width: thin;
            scrollbar-color: var(--concrete-400) var(--concrete-200);
        }

        .transcript-container::-webkit-scrollbar {
            width: 8px;
        }

        .transcript-container::-webkit-scrollbar-track {
            background: var(--concrete-200);
        }

        .transcript-container::-webkit-scrollbar-thumb {
            background-color: var(--concrete-400);
        }

        .transcript-item,
        .transcript-segment {
            display: flex;
            gap: 15px;
            padding: 15px;
            border-bottom: 1px solid var(--concrete-200);
            cursor: pointer;
            transition: all 0.2s;
        }

        .transcript-item:hover,
        .transcript-segment:hover {
            background: var(--concrete-100);
            padding-left: 20px;
            /* Slide effect */
        }

        .ts-time,
        .timestamp {
            font-family: 'JetBrains Mono', monospace;
            color: var(--accent);
            font-size: 0.85rem;
            font-weight: 700;
            min-width: 50px;
            padding-top: 2px;
        }

        .ts-text,
        .segment-text {
            font-family: 'Inter', sans-serif;
            font-size: 0.9rem;
            color: var(--concrete-700);
            line-height: 1.4;
        }

        /* Description Styling */
        .video-description {
            font-size: 1.1rem;
            color: var(--concrete-700);
            margin-bottom: 40px;
            line-height: 1.7;
        }

        .section-title {
            font-family: 'Archivo Black', sans-serif;
            margin-bottom: 20px;
            text-transform: uppercase;
        }

        .video-prompt-wrap {
            margin: 48px 0 0;
            padding-top: 24px;
            border-top: 2px solid var(--concrete-300);
        }

        .video-prompt-details {
            background: #fff;
            border: 1px solid var(--concrete-300);
            box-shadow: 6px 6px 0px var(--concrete-200);
        }

        .video-prompt-summary {
            list-style: none;
            cursor: pointer;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--concrete-900);
            padding: 16px 18px;
        }

        .video-prompt-summary::-webkit-details-marker {
            display: none;
        }

        .prompt-note {
            color: var(--concrete-500);
            font-size: 0.95rem;
            margin: 0 18px 12px;
        }

        .prompt-box {
            background: var(--concrete-900);
            color: var(--concrete-100);
            border: 2px solid var(--concrete-400);
            box-shadow: 8px 8px 0px var(--concrete-300);
            padding: 20px;
            overflow-x: auto;
            white-space: pre-wrap;
            word-break: break-word;
            font-family: 'JetBrains Mono', monospace;
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 0 18px 18px;
        }

        /* CTA Button */
        .cta-btn {
            display: block;
            width: 100%;
            text-align: center;
            background: var(--accent);
            color: white;
            padding: 20px;
            font-weight: 900;
            text-transform: uppercase;
            text-decoration: none;
            font-size: 1.1rem;
            box-shadow: 6px 6px 0px var(--concrete-900);
            transition: transform 0.2s;
            margin-top: 30px;
        }

        .cta-btn:hover {
            transform: translate(-2px, -2px);
            box-shadow: 8px 8px 0px var(--concrete-900);
        }

        /* Footer */
        footer {
            background: var(--concrete-200);
            padding: 40px 0;
            border-top: 2px solid var(--concrete-300);
            text-align: center;
            font-size: 0.9rem;
            color: var(--concrete-500);
            margin-top: 60px;
        }

        /* Responsive */
        @media (max-width: 900px) {
            .content-grid {
                grid-template-columns: 1fr;
            }

            .transcript-container {
                height: 400px;
                /* Shorter on mobile */
            }

            .video-container {
                margin-bottom: 20px;
            }
        }