/* roulang page: index */
:root {
            --bg-primary: #080d1f;
            --bg-secondary: #0c1330;
            --glass-bg: rgba(14, 20, 48, 0.65);
            --glass-border: rgba(255, 255, 255, 0.06);
            --glass-border-hover: rgba(255, 255, 255, 0.14);
            --accent-primary: #3b82f6;
            --accent-gold: #f59e0b;
            --glow-color: rgba(59, 130, 246, 0.5);
            --glow-color-strong: rgba(59, 130, 246, 0.7);
            --text-primary: #e2e8f0;
            --text-secondary: #94a3b8;
            --text-dark: #0f172a;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-sm: 8px;
            --transition-smooth: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --transition-bounce: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --safe-green: #10b981;
            --nav-height: 64px;
            --nav-height-mobile: 56px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
        }

        body {
            font-family: system-ui, -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background-color: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
        }
        input {
            font-family: inherit;
        }

        /* ===== 导航 ===== */
        #main-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            display: flex;
            align-items: center;
            transition: background 0.35s ease, backdrop-filter 0.35s ease, box-shadow 0.35s ease;
            background: rgba(8, 13, 31, 0.55);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border-bottom: 1px solid transparent;
            padding: 0 24px;
        }
        #main-nav.scrolled {
            background: rgba(8, 13, 31, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            box-shadow: 0 1px 30px rgba(0, 0, 0, 0.4);
        }
        #main-nav .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: #fff;
            letter-spacing: 0.02em;
            white-space: nowrap;
            flex-shrink: 0;
        }
        .nav-logo .logo-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
        }
        .nav-links-desktop {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
        }
        .nav-links-desktop a {
            display: block;
            padding: 8px 16px;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: color 0.2s, background 0.2s;
            position: relative;
            white-space: nowrap;
        }
        .nav-links-desktop a:hover,
        .nav-links-desktop a.active {
            color: #fff;
        }
        .nav-links-desktop a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 18px;
            height: 2px;
            background: var(--accent-primary);
            border-radius: 1px;
            box-shadow: 0 0 8px var(--glow-color);
        }
        .nav-cta-btn {
            display: inline-block;
            padding: 9px 20px;
            border-radius: var(--radius-btn);
            background: var(--accent-primary);
            color: #fff !important;
            font-weight: 600;
            font-size: 0.85rem;
            box-shadow: 0 0 18px var(--glow-color), 0 0 40px rgba(59, 130, 246, 0.18);
            transition: all var(--transition-smooth);
            white-space: nowrap;
            text-align: center;
        }
        .nav-cta-btn:hover {
            box-shadow: 0 0 28px var(--glow-color-strong), 0 0 56px rgba(59, 130, 246, 0.3);
            transform: scale(1.03);
            background: #4f92f7;
        }
        .nav-cta-btn:active {
            transform: scale(0.97);
        }

        /* 汉堡按钮 */
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            width: 40px;
            height: 40px;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 6px;
            cursor: pointer;
            z-index: 1001;
            padding: 0;
        }
        .hamburger-btn span {
            display: block;
            width: 26px;
            height: 2px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.3s ease;
            transform-origin: center;
        }
        .hamburger-btn.open span:nth-child(1) {
            transform: translateY(8px) rotate(45deg);
        }
        .hamburger-btn.open span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger-btn.open span:nth-child(3) {
            transform: translateY(-8px) rotate(-45deg);
        }

        /* 移动端覆盖菜单 */
        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            z-index: 999;
            background: rgba(6, 10, 24, 0.96);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 8px;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-menu-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu-overlay a {
            display: block;
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text-primary);
            padding: 14px 28px;
            border-radius: 10px;
            transition: all 0.25s;
            text-align: center;
        }
        .mobile-menu-overlay a:hover,
        .mobile-menu-overlay a.active {
            color: #fff;
            background: rgba(59, 130, 246, 0.15);
        }
        .mobile-menu-overlay .mobile-cta {
            margin-top: 16px;
            padding: 14px 36px;
            background: var(--accent-primary);
            color: #fff;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 1.1rem;
            box-shadow: 0 0 24px var(--glow-color);
        }

        /* ===== 玻璃拟态卡片 ===== */
        .glass-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            transition: all var(--transition-bounce);
            position: relative;
            overflow: hidden;
        }
        .glass-card::before {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: inherit;
            pointer-events: none;
            background: linear-gradient(135deg, rgba(255, 255, 255, 0.04) 0%, transparent 50%, rgba(255, 255, 255, 0.01) 100%);
            z-index: 1;
        }
        .glass-card:hover {
            border-color: var(--glass-border-hover);
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
            transform: translateY(-6px);
        }
        .glass-card>* {
            position: relative;
            z-index: 2;
        }

        /* ===== 发光按钮 ===== */
        .glow-btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            background: var(--accent-primary);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            box-shadow: 0 0 24px var(--glow-color), 0 0 60px rgba(59, 130, 246, 0.2);
            transition: all var(--transition-smooth);
            text-align: center;
            white-space: nowrap;
            position: relative;
            overflow: hidden;
        }
        .glow-btn::after {
            content: '';
            position: absolute;
            inset: 0;
            border-radius: inherit;
            pointer-events: none;
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, transparent 60%);
        }
        .glow-btn:hover {
            box-shadow: 0 0 36px var(--glow-color-strong), 0 0 80px rgba(59, 130, 246, 0.35), 0 0 120px rgba(59, 130, 246, 0.15);
            transform: scale(1.04);
            background: #5098f8;
        }
        .glow-btn:active {
            transform: scale(0.97);
        }
        .glow-btn:focus-visible {
            outline: 3px solid rgba(59, 130, 246, 0.6);
            outline-offset: 3px;
        }
        .glow-btn-gold {
            background: var(--accent-gold);
            box-shadow: 0 0 24px rgba(245, 158, 11, 0.45), 0 0 60px rgba(245, 158, 11, 0.18);
            color: #0f172a;
            font-weight: 700;
        }
        .glow-btn-gold:hover {
            box-shadow: 0 0 36px rgba(245, 158, 11, 0.65), 0 0 80px rgba(245, 158, 11, 0.3);
            background: #f6a823;
        }
        .glow-btn-gold::after {
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.2) 0%, transparent 60%);
        }

        /* 次按钮 */
        .btn-outline {
            display: inline-block;
            padding: 13px 30px;
            border-radius: var(--radius-sm);
            background: transparent;
            border: 1.5px solid rgba(255, 255, 255, 0.2);
            color: #fff;
            font-weight: 500;
            font-size: 1rem;
            cursor: pointer;
            transition: all var(--transition-smooth);
            white-space: nowrap;
            text-align: center;
        }
        .btn-outline:hover {
            border-color: rgba(255, 255, 255, 0.5);
            background: rgba(255, 255, 255, 0.04);
            box-shadow: 0 0 20px rgba(255, 255, 255, 0.06);
        }
        .btn-outline:focus-visible {
            outline: 3px solid rgba(255, 255, 255, 0.4);
            outline-offset: 3px;
        }

        /* ===== Hero粒子背景 ===== */
        .hero-particles {
            position: absolute;
            inset: 0;
            pointer-events: none;
            overflow: hidden;
            z-index: 1;
        }
        .hero-particle {
            position: absolute;
            border-radius: 50%;
            background: var(--accent-primary);
            opacity: 0;
            animation: floatUp linear infinite;
        }
        @keyframes floatUp {
            0% {
                opacity: 0;
                transform: translateY(0) scale(0.3);
            }
            10% {
                opacity: 0.7;
            }
            90% {
                opacity: 0.15;
            }
            100% {
                opacity: 0;
                transform: translateY(-100vh) scale(1.2);
            }
        }
        @keyframes pulseGlow {
            0%,
            100% {
                opacity: 0.4;
            }
            50% {
                opacity: 0.8;
            }
        }

        /* 赛道几何线 */
        .track-line {
            position: absolute;
            pointer-events: none;
            z-index: 0;
            opacity: 0.18;
        }
        .track-line svg {
            width: 100%;
            height: 100%;
        }

        /* ===== FAQ手风琴 ===== */
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            overflow: hidden;
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 0;
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.05rem;
            font-weight: 600;
            cursor: pointer;
            text-align: left;
            gap: 16px;
            transition: color 0.25s;
            line-height: 1.4;
        }
        .faq-question:hover {
            color: var(--accent-primary);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1.5px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.35s ease;
            font-size: 1.1rem;
            color: var(--text-secondary);
            position: relative;
        }
        .faq-item.open .faq-icon {
            border-color: var(--accent-primary);
            color: var(--accent-primary);
            box-shadow: 0 0 12px var(--glow-color);
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94), padding 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            padding: 0 0;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 0 18px 0;
        }
        .faq-answer p {
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
            margin: 0;
        }

        /* ===== 数字滚动 ===== */
        .count-number {
            font-family: 'DIN Alternate', 'Helvetica Neue', system-ui, sans-serif;
            font-weight: 700;
            font-size: 3.2rem;
            line-height: 1;
            font-feature-settings: "tnum";
        }
        @media (max-width: 767px) {
            .count-number {
                font-size: 2.4rem;
            }
        }

        /* ===== 区块通用 ===== */
        .section-block {
            padding: 100px 24px;
            position: relative;
        }
        @media (max-width: 1023px) {
            .section-block {
                padding: 70px 20px;
            }
        }
        @media (max-width: 767px) {
            .section-block {
                padding: 50px 16px;
            }
            :root {
                --nav-height: 56px;
            }
            html {
                scroll-padding-top: var(--nav-height);
            }
        }
        .container-custom {
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
        }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent-primary);
            margin-bottom: 8px;
        }
        .section-title {
            font-size: 2.3rem;
            font-weight: 700;
            color: #fff;
            line-height: 1.25;
            margin-bottom: 16px;
        }
        @media (max-width: 767px) {
            .section-title {
                font-size: 1.7rem;
            }
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
            line-height: 1.7;
            max-width: 600px;
        }

        /* 背景条纹纹理 */
        .bg-striped {
            background-image: repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(255, 255, 255, 0.015) 2px, rgba(255, 255, 255, 0.015) 4px);
        }

        /* 径向发光 */
        .radial-glow {
            position: relative;
        }
        .radial-glow::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(59, 130, 246, 0.12) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .radial-glow>* {
            position: relative;
            z-index: 1;
        }

        /* 页脚顶部分隔线 */
        .footer-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.35), transparent);
            margin-bottom: 40px;
        }

        /* 标签 */
        .tag-pill {
            display: inline-block;
            padding: 5px 12px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 500;
            border: 1px solid rgba(245, 158, 11, 0.5);
            color: var(--accent-gold);
            background: rgba(245, 158, 11, 0.06);
            letter-spacing: 0.03em;
        }
        .tag-blue {
            border-color: rgba(59, 130, 246, 0.5);
            color: var(--accent-primary);
            background: rgba(59, 130, 246, 0.06);
        }

        /* 滚动指示器 */
        .scroll-indicator {
            position: absolute;
            bottom: 32px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 3;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            animation: bounceDown 2s ease-in-out infinite;
            cursor: pointer;
        }
        .scroll-indicator span {
            display: block;
            width: 8px;
            height: 8px;
            border-right: 2px solid rgba(255, 255, 255, 0.5);
            border-bottom: 2px solid rgba(255, 255, 255, 0.5);
            transform: rotate(45deg);
        }
        @keyframes bounceDown {
            0%,
            100% {
                transform: translateX(-50%) translateY(0);
            }
            50% {
                transform: translateX(-50%) translateY(14px);
            }
        }

        /* 优势数据背景 */
        .advantages-bg {
            background: var(--bg-secondary);
            background-image: repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(255, 255, 255, 0.02) 3px, rgba(255, 255, 255, 0.02) 6px),
                repeating-linear-gradient(90deg, transparent, transparent 3px, rgba(255, 255, 255, 0.015) 3px, rgba(255, 255, 255, 0.015) 6px);
        }

        @media (max-width: 767px) {
            .hamburger-btn {
                display: flex;
            }
            .nav-links-desktop {
                display: none;
            }
            .nav-cta-desktop {
                display: none;
            }
        }
        @media (min-width: 768px) {
            .mobile-menu-overlay {
                display: none !important;
            }
        }