/* roulang page: index */
:root {
            --bg-primary: #080C1A;
            --bg-secondary: #0E1328;
            --accent-cyan: #00D9FF;
            --accent-purple: #7C3AED;
            --cta-warm: #FF6A2C;
            --text-primary: #E8ECF4;
            --text-secondary: #8892B0;
            --success: #10E479;
            --glass-bg: rgba(14, 19, 40, 0.65);
            --glass-border: rgba(0, 217, 255, 0.15);
            --glass-border-hover: rgba(0, 217, 255, 0.45);
            --glow-cyan: rgba(0, 217, 255, 0.45);
            --glow-purple: rgba(124, 58, 237, 0.4);
            --radius-card: 16px;
            --radius-inner: 12px;
            --radius-btn: 8px;
            --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 24px rgba(0, 217, 255, 0.25);
            --shadow-glow-warm: 0 0 32px rgba(255, 106, 44, 0.5);
            --font-display: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --font-mono: 'Inter', 'SF Mono', 'JetBrains Mono', monospace;
            --transition-fast: 0.25s ease-out;
            --transition-smooth: 0.3s ease-out;
            --transition-slow: 0.35s ease-out;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            scroll-padding-top: 80px;
        }

        body {
            font-family: var(--font-body);
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
            min-height: 100vh;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            text-decoration: none;
            color: inherit;
            transition: color var(--transition-fast);
        }
        button {
            cursor: pointer;
            border: none;
            font-family: inherit;
            transition: all var(--transition-fast);
        }
        input {
            font-family: inherit;
            outline: none;
        }

        /* 玻璃拟态卡片 */
        .glass-card {
            background: var(--glass-bg);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
        }
        .glass-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url("data:image/svg+xml,%3Csvg width='60' height='60' xmlns='http://www.w3.org/2000/svg'%3E%3Cdefs%3E%3Cpattern id='grid' width='4' height='4' patternUnits='userSpaceOnUse'%3E%3Ccircle cx='2' cy='2' r='0.6' fill='rgba(255,255,255,0.03)'/%3E%3C/pattern%3E%3C/defs%3E%3Crect width='60' height='60' fill='url(/%23grid)'/%3E%3C/svg%3E");
            pointer-events: none;
            opacity: 0.5;
            z-index: 0;
        }
        .glass-card>* {
            position: relative;
            z-index: 1;
        }
        .glass-card:hover {
            border-color: var(--glass-border-hover);
            box-shadow: var(--shadow-card), var(--shadow-glow);
            transform: translateY(-6px);
        }

        /* 主按钮发光 */
        .btn-primary {
            background: var(--accent-cyan);
            color: #080C1A;
            border-radius: var(--radius-btn);
            padding: 14px 28px;
            font-weight: 700;
            font-size: 16px;
            letter-spacing: 0.5px;
            transition: all var(--transition-fast);
            box-shadow: 0 0 0 rgba(0, 217, 255, 0);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-primary:hover {
            box-shadow: 0 0 32px rgba(0, 217, 255, 0.6);
            transform: scale(1.03);
        }
        .btn-primary:active {
            transform: scale(0.97);
            transition: transform 0.1s;
        }

        .btn-cta {
            background: var(--cta-warm);
            color: #FFFFFF;
            border-radius: var(--radius-btn);
            padding: 14px 28px;
            font-weight: 700;
            font-size: 16px;
            letter-spacing: 0.5px;
            transition: all var(--transition-fast);
            box-shadow: 0 0 0 rgba(255, 106, 44, 0);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            white-space: nowrap;
        }
        .btn-cta:hover {
            box-shadow: 0 0 36px rgba(255, 106, 44, 0.55);
            transform: scale(1.03);
        }
        .btn-cta:active {
            transform: scale(0.97);
            transition: transform 0.1s;
        }

        .btn-outline {
            background: transparent;
            border: 1.5px solid rgba(0, 217, 255, 0.4);
            color: var(--accent-cyan);
            border-radius: var(--radius-btn);
            padding: 12px 24px;
            font-weight: 600;
            font-size: 15px;
            letter-spacing: 0.4px;
            transition: all var(--transition-fast);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
            white-space: nowrap;
        }
        .btn-outline:hover {
            border-color: var(--accent-cyan);
            background: rgba(0, 217, 255, 0.08);
            box-shadow: 0 0 18px rgba(0, 217, 255, 0.2);
        }

        .text-link {
            color: var(--accent-cyan);
            transition: all var(--transition-fast);
            cursor: pointer;
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }
        .text-link:hover {
            text-decoration: underline;
            text-underline-offset: 4px;
        }
        .text-link .arrow {
            display: inline-block;
            transition: transform var(--transition-fast);
        }
        .text-link:hover .arrow {
            transform: translateX(4px);
        }

        /* 导航 */
        #global-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(8, 12, 26, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid transparent;
            transition: all var(--transition-smooth);
            height: 72px;
            display: flex;
            align-items: center;
        }
        #global-nav::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.27), transparent);
            transition: opacity var(--transition-smooth);
        }
        #global-nav.scrolled {
            background: rgba(8, 12, 26, 0.95);
        }
        #global-nav.scrolled::after {
            background: linear-gradient(90deg, transparent, rgba(0, 217, 255, 0.5), transparent);
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-family: var(--font-display);
            font-weight: 800;
            font-size: 22px;
            color: var(--text-primary);
            letter-spacing: 1px;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: conic-gradient(from 0deg, var(--accent-cyan), var(--accent-purple), var(--accent-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            color: #fff;
            box-shadow: 0 0 16px rgba(0, 217, 255, 0.35);
            flex-shrink: 0;
        }
        .nav-link {
            font-weight: 500;
            font-size: 15px;
            color: var(--text-secondary);
            padding: 8px 14px;
            border-radius: 6px;
            transition: all var(--transition-fast);
            white-space: nowrap;
            position: relative;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--accent-cyan);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--accent-cyan);
            box-shadow: 0 0 8px var(--accent-cyan);
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
            padding: 8px;
            background: transparent;
            border: none;
        }
        .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all var(--transition-fast);
            display: block;
        }
        .hamburger:hover span {
            background: var(--accent-cyan);
        }
        .hamburger.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        #mobile-menu {
            display: none;
            position: fixed;
            inset: 0;
            z-index: 999;
            background: rgba(8, 12, 26, 0.96);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 36px;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-smooth);
        }
        #mobile-menu.open {
            opacity: 1;
            pointer-events: auto;
        }
        #mobile-menu a {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            letter-spacing: 1px;
            transition: color var(--transition-fast);
            padding: 12px 24px;
        }
        #mobile-menu a:hover {
            color: var(--accent-cyan);
        }
        #mobile-menu .close-btn {
            position: absolute;
            top: 24px;
            right: 24px;
            font-size: 28px;
            color: var(--text-primary);
            background: transparent;
            border: none;
            cursor: pointer;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: all var(--transition-fast);
        }
        #mobile-menu .close-btn:hover {
            color: var(--accent-cyan);
            background: rgba(255, 255, 255, 0.05);
        }

        /* Hero光晕 */
        .hero-glow {
            position: absolute;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(0, 217, 255, 0.14) 0%, transparent 70%);
            pointer-events: none;
            animation: heroGlowFloat 10s ease-in-out infinite;
        }
        @keyframes heroGlowFloat {
            0%,
            100% {
                transform: translate(0, 0);
            }
            25% {
                transform: translate(30px, -20px);
            }
            50% {
                transform: translate(-10px, 25px);
            }
            75% {
                transform: translate(-25px, -10px);
            }
        }

        /* FAQ手风琴 */
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            cursor: pointer;
            transition: all var(--transition-smooth);
        }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 8px;
            font-weight: 600;
            font-size: 16px;
            color: var(--text-primary);
            transition: color var(--transition-fast);
            min-height: 48px;
            gap: 16px;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 18px;
            transition: transform var(--transition-smooth);
            font-weight: 700;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
            padding: 0 8px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-question {
            color: var(--accent-cyan);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 8px 18px 8px;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }
        .faq-item.open {
            background: rgba(0, 217, 255, 0.03);
            border-radius: 8px;
            border-bottom-color: transparent;
        }

        /* 输入框 */
        .input-dark {
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 8px;
            padding: 12px 16px;
            color: var(--text-primary);
            font-size: 15px;
            transition: all var(--transition-fast);
            width: 100%;
            outline: none;
        }
        .input-dark:focus {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 12px rgba(0, 217, 255, 0.2);
        }
        .input-dark::placeholder {
            color: var(--text-secondary);
            opacity: 0.6;
        }

        /* section标题下划线 */
        .section-badge {
            display: inline-block;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            background: rgba(0, 217, 255, 0.08);
            color: var(--accent-cyan);
            border: 1px solid rgba(0, 217, 255, 0.2);
            margin-bottom: 12px;
        }

        /* 响应式 */
        @media (max-width: 1023px) {
            .nav-links-desktop {
                display: none !important;
            }
            .nav-cta-desktop {
                display: none !important;
            }
            .hamburger {
                display: flex;
            }
            #mobile-menu {
                display: flex;
            }
            html {
                scroll-padding-top: 72px;
            }
        }

        @media (min-width: 1024px) {
            .hamburger {
                display: none;
            }
            #mobile-menu {
                display: none !important;
                opacity: 0;
                pointer-events: none;
            }
            .nav-links-desktop {
                display: flex;
            }
            .nav-cta-desktop {
                display: inline-flex;
            }
        }

        @media (max-width: 767px) {
            .btn-primary,
            .btn-cta,
            .btn-outline {
                padding: 12px 20px;
                font-size: 15px;
                min-height: 44px;
            }
            .glass-card:hover {
                transform: translateY(-3px);
            }
            #global-nav {
                height: 60px;
            }
            .nav-logo {
                font-size: 18px;
            }
            .nav-logo .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 14px;
            }
        }

        @media (max-width: 480px) {
            body {
                font-size: 14px;
            }
            .btn-primary,
            .btn-cta,
            .btn-outline {
                width: 100%;
                justify-content: center;
                padding: 13px 18px;
                font-size: 14px;
                min-height: 44px;
            }
            .faq-question {
                font-size: 14px;
                padding: 14px 6px;
            }
            .faq-answer {
                font-size: 13px;
            }
        }