/* roulang page: index */
:root {
            --bg-primary: #0a0f1a;
            --bg-secondary: #0d1321;
            --bg-card: rgba(15, 25, 45, 0.7);
            --bg-glass: rgba(255, 255, 255, 0.05);
            --border-glass: rgba(255, 255, 255, 0.1);
            --accent-cyan: #00f0ff;
            --accent-amber: #d4a853;
            --text-primary: #e0e6f0;
            --text-secondary: #8899b4;
            --text-white: #ffffff;
            --glow-cyan: 0 0 10px rgba(0, 240, 255, 0.5);
            --glow-cyan-strong: 0 0 25px rgba(0, 240, 255, 0.7);
            --glow-amber: 0 0 12px rgba(212, 168, 83, 0.5);
            --radius-sm: 0.75rem;
            --radius-md: 1rem;
            --radius-lg: 1.5rem;
            --radius-xl: 2rem;
            --radius-3xl: 2.5rem;
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.3);
            --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            overflow-x: hidden;
            min-height: 100vh;
        }

        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(ellipse at 50% 30%, rgba(0, 240, 255, 0.04) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 70%, rgba(212, 168, 83, 0.03) 0%, transparent 50%),
                radial-gradient(ellipse at 20% 60%, rgba(0, 180, 200, 0.03) 0%, transparent 50%);
            pointer-events: none;
            z-index: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-base);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
            transition: var(--transition-base);
        }

        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 1.5rem;
            position: relative;
            z-index: 1;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 1rem;
            }
        }

        .glass-card {
            background: var(--bg-card);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            transition: var(--transition-base);
        }

        .glass-card:hover {
            border-color: rgba(0, 240, 255, 0.3);
            box-shadow: var(--shadow-card), var(--glow-cyan);
        }

        .glass-card-light {
            background: var(--bg-glass);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-glass);
            border-radius: var(--radius-lg);
            transition: var(--transition-base);
        }

        .glass-card-light:hover {
            border-color: rgba(0, 240, 255, 0.35);
            box-shadow: var(--glow-cyan);
        }

        .btn-cyan {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            background: rgba(0, 240, 255, 0.08);
            border: 1.5px solid rgba(0, 240, 255, 0.5);
            color: var(--accent-cyan);
            border-radius: var(--radius-md);
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.2);
            letter-spacing: 0.02em;
        }

        .btn-cyan:hover {
            background: rgba(0, 240, 255, 0.18);
            border-color: var(--accent-cyan);
            box-shadow: var(--glow-cyan-strong);
            transform: translateY(-2px);
            color: #ffffff;
        }

        .btn-cyan:active {
            transform: translateY(0);
            box-shadow: var(--glow-cyan);
        }

        .btn-amber {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            padding: 0.85rem 2rem;
            background: rgba(212, 168, 83, 0.1);
            border: 1.5px solid rgba(212, 168, 83, 0.6);
            color: var(--accent-amber);
            border-radius: var(--radius-md);
            font-weight: 700;
            cursor: pointer;
            transition: var(--transition-base);
            box-shadow: 0 0 10px rgba(212, 168, 83, 0.25);
            letter-spacing: 0.03em;
            font-size: 1.05rem;
        }

        .btn-amber:hover {
            background: rgba(212, 168, 83, 0.2);
            border-color: var(--accent-amber);
            box-shadow: var(--glow-amber);
            transform: translateY(-2px);
            color: #ffffff;
        }

        .btn-amber:active {
            transform: translateY(0);
        }

        .glow-text-cyan {
            color: var(--accent-cyan);
            text-shadow: 0 0 15px rgba(0, 240, 255, 0.6), 0 0 30px rgba(0, 240, 255, 0.3);
        }

        .glow-text-amber {
            color: var(--accent-amber);
            text-shadow: 0 0 12px rgba(212, 168, 83, 0.5);
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 800;
            color: var(--text-white);
            text-align: center;
            margin-bottom: 0.75rem;
            letter-spacing: 0.03em;
            position: relative;
            display: inline-block;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--accent-cyan);
            border-radius: 2px;
            box-shadow: 0 0 12px rgba(0, 240, 255, 0.7);
        }

        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-secondary);
            text-align: center;
            max-width: 650px;
            margin: 1rem auto 2.5rem;
            line-height: 1.7;
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 1.7rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 1.8rem;
            }
            .btn-cyan,
            .btn-amber {
                padding: 0.65rem 1.4rem;
                font-size: 0.95rem;
            }
        }

        @keyframes floatUp {
            0%,
            100% {
                transform: translateY(0);
            }
            50% {
                transform: translateY(-8px);
            }
        }

        @keyframes pulseGlow {
            0%,
            100% {
                box-shadow: 0 0 10px rgba(0, 240, 255, 0.4);
            }
            50% {
                box-shadow: 0 0 28px rgba(0, 240, 255, 0.75);
            }
        }

        @keyframes scrollIndicator {
            0%,
            100% {
                opacity: 0.6;
                transform: translateY(0);
            }
            50% {
                opacity: 1;
                transform: translateY(10px);
            }
        }

        @keyframes shimmer {
            0% {
                background-position: -200% 0;
            }
            100% {
                background-position: 200% 0;
            }
        }

        .animate-float {
            animation: floatUp 4s ease-in-out infinite;
        }

        .animate-pulse-glow {
            animation: pulseGlow 2.5s ease-in-out infinite;
        }

        .animate-scroll {
            animation: scrollIndicator 2s ease-in-out infinite;
        }

        .shimmer-border {
            position: relative;
            overflow: hidden;
        }

        .shimmer-border::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(0, 240, 255, 0.15), transparent);
            animation: shimmer 3s infinite;
        }

        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-primary);
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(0, 240, 255, 0.3);
            border-radius: 3px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(0, 240, 255, 0.55);
        }

        input:focus,
        textarea:focus,
        select:focus {
            outline: 2px solid rgba(0, 240, 255, 0.5);
            outline-offset: 2px;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.35);
        }

        @media (max-width: 1024px) {
            html {
                font-size: 15px;
            }
        }
        @media (max-width: 640px) {
            html {
                font-size: 14px;
            }
        }