/* roulang page: index */
:root {
            --bg-pitch-dark: #0A0D14;
            --bg-pitch-card: #121722;
            --border-pitch: #1F2937;
            --grass-primary: #10B981;
            --grass-neon: #00F59B;
            --accent-gold: #FBBF24;
            --accent-fire: #F97316;
            --text-main: #F9FAFB;
            --text-muted: #D1D5DB;
            --text-dim: #6B7280;
        }

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

        body {
            background-color: var(--bg-pitch-dark);
            color: var(--text-muted);
            font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }

        h1, h2, h3, h4, h5, h6 {
            color: var(--text-main);
            font-weight: 700;
            line-height: 1.25;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: all 0.2s ease-in-out;
        }

        /* Glassmorphism Navigation */
        .glass-nav {
            background: rgba(10, 13, 20, 0.75);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .glass-nav.scrolled {
            background: rgba(10, 13, 20, 0.95);
            border-bottom: 1px solid rgba(16, 185, 129, 0.2);
            box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.8);
        }

        /* Bento & Card Styles */
        .card-surface {
            background: rgba(18, 23, 34, 0.75);
            backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 1rem;
            transition: transform 0.25s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.25s ease, box-shadow 0.25s ease;
        }
        .card-surface:hover {
            border-color: rgba(16, 185, 129, 0.4);
            box-shadow: 0 10px 25px -5px rgba(16, 185, 129, 0.15);
            transform: translateY(-2px);
        }

        /* Primary Action Buttons */
        .btn-primary {
            background: linear-gradient(135deg, #00F59B 0%, #10B981 100%);
            color: #061A14;
            font-weight: 700;
            padding: 0.75rem 1.75rem;
            border-radius: 0.75rem;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            box-shadow: 0 4px 14px rgba(0, 245, 155, 0.25);
            transition: transform 0.15s ease, filter 0.2s ease, box-shadow 0.2s ease;
        }
        .btn-primary:hover {
            filter: brightness(1.1);
            box-shadow: 0 6px 20px rgba(0, 245, 155, 0.4);
        }
        .btn-primary:active {
            transform: scale(0.97);
        }

        /* Secondary Action Buttons */
        .btn-secondary {
            background: rgba(255, 255, 255, 0.05);
            color: #F9FAFB;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            border-radius: 0.75rem;
            border: 1px solid rgba(255, 255, 255, 0.15);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            transition: all 0.2s ease;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(0, 245, 155, 0.5);
            color: #00F59B;
        }

        /* Live Indicator */
        .live-ping {
            position: relative;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 0.75rem;
            height: 0.75rem;
        }
        .live-ping::before {
            content: '';
            position: absolute;
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #EF4444;
            animation: ping 1.5s cubic-bezier(0, 0, 0.2, 1) infinite;
        }
        .live-ping::after {
            content: '';
            position: relative;
            width: 0.5rem;
            height: 0.5rem;
            border-radius: 50%;
            background-color: #EF4444;
        }
        @keyframes ping {
            75%, 100% {
                transform: scale(2.2);
                opacity: 0;
            }
        }

        /* Code/Data Pill */
        .badge-pill {
            background: rgba(16, 185, 129, 0.12);
            color: #00F59B;
            border: 1px solid rgba(0, 245, 155, 0.25);
            padding: 0.25rem 0.75rem;
            border-radius: 9999px;
            font-size: 0.8125rem;
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 0.375rem;
        }

        /* Section Layouts */
        .section-wrapper {
            padding-top: 5rem;
            padding-bottom: 5rem;
            position: relative;
        }
        .section-divider {
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* Video Stage Mask Simulation */
        .hero-video-bg {
            background: radial-gradient(circle at 50% 30%, rgba(16, 185, 129, 0.18) 0%, rgba(10, 13, 20, 0.95) 70%),
                        linear-gradient(180deg, rgba(10, 13, 20, 0.3) 0%, #0A0D14 100%);
        }
        .grid-pattern {
            background-image: linear-gradient(to right, rgba(255,255,255,0.03) 1px, transparent 1px),
                              linear-gradient(to bottom, rgba(255,255,255,0.03) 1px, transparent 1px);
            background-size: 32px 32px;
        }

        /* Accordion Details */
        details summary::-webkit-details-marker {
            display: none;
        }
        details summary {
            list-style: none;
        }
        details[open] summary svg {
            transform: rotate(180deg);
        }