/* roulang page: index */
:root {
            --deep-blue: #0A0E27;
            --dark-base: #0B0D17;
            --electric-purple: #6C3BFC;
            --cyan-glow: #00E5FF;
            --cyber-orange: #FF6B35;
            --cold-green: #00F0B4;
            --card-bg: rgba(15, 18, 40, 0.8);
            --text-primary: #F0F0F5;
            --text-secondary: #B0B5CD;
            --text-muted: #6E7290;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(108, 59, 252, 0.35);
            --shadow-card: 0 8px 32px rgba(108, 59, 252, 0.18);
            --shadow-glow: 0 0 48px rgba(108, 59, 252, 0.35);
            --shadow-cyan: 0 0 40px rgba(0, 229, 255, 0.25);
            --radius-card: 24px;
            --radius-pill: 40px;
            --radius-badge: 8px;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 80px;
        }

        body {
            font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            background-color: var(--dark-base);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition-smooth);
        }
        a:hover {
            color: var(--cyan-glow);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        input,
        textarea,
        select {
            font-family: inherit;
            outline: none;
        }
        button:focus-visible,
        a:focus-visible,
        input:focus-visible,
        textarea:focus-visible {
            outline: 2px solid var(--cyan-glow);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* 噪声纹理背景 */
        body::before {
            content: '';
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 0;
            opacity: 0.035;
            background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(/%23noise)' opacity='1'/%3E%3C/svg%3E");
            background-size: 256px 256px;
        }

        .container-custom {
            max-width: 1260px;
            margin: 0 auto;
            padding: 0 28px;
        }

        /* 导航 */
        .nav-glass {
            background: rgba(10, 14, 27, 0.78);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid transparent;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: all var(--transition-smooth);
        }
        .nav-glass.scrolled {
            border-bottom-color: rgba(108, 59, 252, 0.3);
            box-shadow: 0 4px 24px rgba(108, 59, 252, 0.12);
        }
        .nav-link {
            position: relative;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            padding: 6px 2px;
            transition: color var(--transition-smooth);
            white-space: nowrap;
        }
        .nav-link:hover,
        .nav-link.active {
            color: #fff;
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--electric-purple), var(--cyan-glow));
            border-radius: 2px;
            transition: width var(--transition-smooth);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        /* 按钮 */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-pill);
            font-weight: 700;
            font-size: 15px;
            color: #fff;
            background: linear-gradient(135deg, var(--electric-purple), #8B5CF6, var(--cyan-glow));
            background-size: 200% 200%;
            animation: gradientShift 4s ease infinite;
            box-shadow: 0 4px 20px rgba(108, 59, 252, 0.35);
            transition: all var(--transition-smooth);
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .btn-primary:hover {
            box-shadow: 0 6px 32px rgba(108, 59, 252, 0.55), 0 0 60px rgba(0, 229, 255, 0.2);
            transform: translateY(-2px);
            color: #fff;
            filter: brightness(1.1);
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 12px rgba(108, 59, 252, 0.3);
            transition: all 0.1s;
        }
        .btn-primary.loading {
            pointer-events: none;
            opacity: 0.75;
        }
        @keyframes gradientShift {
            0%,
            100% {
                background-position: 0% 50%;
            }
            25% {
                background-position: 100% 0%;
            }
            50% {
                background-position: 100% 100%;
            }
            75% {
                background-position: 0% 100%;
            }
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 13px 30px;
            border-radius: var(--radius-pill);
            font-weight: 600;
            font-size: 15px;
            color: #fff;
            background: transparent;
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            transition: all var(--transition-smooth);
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .btn-secondary:hover {
            background: rgba(108, 59, 252, 0.2);
            border-color: var(--electric-purple);
            box-shadow: 0 0 24px rgba(108, 59, 252, 0.2);
            color: #fff;
        }

        .btn-cta-nav {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 22px;
            border-radius: var(--radius-pill);
            font-weight: 700;
            font-size: 14px;
            color: #fff;
            background: var(--cyber-orange);
            box-shadow: 0 4px 16px rgba(255, 107, 53, 0.3);
            transition: all var(--transition-smooth);
            white-space: nowrap;
        }
        .btn-cta-nav:hover {
            box-shadow: 0 6px 24px rgba(255, 107, 53, 0.5);
            transform: translateY(-1px);
            color: #fff;
            filter: brightness(1.08);
        }
        .btn-cta-nav:active {
            transform: translateY(0);
        }

        /* 卡片 */
        .card-glass {
            background: var(--card-bg);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: all var(--transition-smooth);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
        .card-glass:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        /* 数据徽章 */
        .badge-data {
            display: inline-flex;
            align-items: center;
            gap: 5px;
            padding: 5px 12px;
            border-radius: var(--radius-badge);
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.4px;
            white-space: nowrap;
        }
        .badge-purple {
            background: rgba(108, 59, 252, 0.2);
            color: #B794F4;
            border: 1px solid rgba(108, 59, 252, 0.3);
        }
        .badge-cyan {
            background: rgba(0, 229, 255, 0.15);
            color: #67E8F9;
            border: 1px solid rgba(0, 229, 255, 0.25);
        }
        .badge-green {
            background: rgba(0, 240, 180, 0.15);
            color: #4ADE80;
            border: 1px solid rgba(0, 240, 180, 0.25);
        }
        .badge-orange {
            background: rgba(255, 107, 53, 0.18);
            color: #FB923C;
            border: 1px solid rgba(255, 107, 53, 0.3);
        }
        .badge-tag {
            position: absolute;
            top: 16px;
            right: 16px;
            padding: 4px 10px;
            border-radius: 20px;
            font-size: 11px;
            font-weight: 700;
            letter-spacing: 0.5px;
            z-index: 2;
        }
        .badge-tag.hot {
            background: rgba(255, 107, 53, 0.85);
            color: #fff;
            box-shadow: 0 2px 12px rgba(255, 107, 53, 0.4);
        }
        .badge-tag.core {
            background: rgba(108, 59, 252, 0.85);
            color: #fff;
            box-shadow: 0 2px 12px rgba(108, 59, 252, 0.4);
        }

        /* 指标数字 */
        .metric-number {
            font-size: clamp(36px, 5vw, 56px);
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(180deg, #F0F0F5 0%, #C4B5FD 50%, var(--cyan-glow) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.1;
        }

        /* Hero区域 */
        .hero-section {
            min-height: 100vh;
            position: relative;
            display: flex;
            align-items: center;
            background: var(--dark-base);
            overflow: hidden;
        }
        .hero-bg-img {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.3;
            pointer-events: none;
            z-index: 1;
        }
        .hero-grid-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 2;
            opacity: 0.06;
            background-image:
                linear-gradient(rgba(108, 59, 252, 0.4) 1px, transparent 1px),
                linear-gradient(90deg, rgba(108, 59, 252, 0.4) 1px, transparent 1px);
            background-size: 60px 60px;
        }
        .hero-content {
            position: relative;
            z-index: 3;
        }

        /* 浮动数据徽章 */
        .float-badge {
            animation: floatBadge 3.5s ease-in-out infinite;
        }
        .float-badge:nth-child(1) {
            animation-delay: 0s;
        }
        .float-badge:nth-child(2) {
            animation-delay: 0.7s;
        }
        .float-badge:nth-child(3) {
            animation-delay: 1.4s;
        }
        @keyframes floatBadge {
            0%,
            100% {
                transform: translateY(0);
            }
            30% {
                transform: translateY(-14px);
            }
            60% {
                transform: translateY(-5px);
            }
        }

        /* 指标动画 */
        @keyframes pulseGlow {
            0%,
            100% {
                filter: brightness(1);
            }
            50% {
                filter: brightness(1.3);
            }
        }
        .metric-animate {
            animation: pulseGlow 2.5s ease-in-out infinite;
        }

        /* FAQ手风琴 */
        .faq-item {
            border-bottom: 1px solid var(--border-subtle);
            overflow: hidden;
        }
        .faq-trigger {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 20px 8px;
            background: transparent;
            color: var(--text-primary);
            font-size: 17px;
            font-weight: 600;
            text-align: left;
            cursor: pointer;
            transition: all var(--transition-smooth);
            gap: 16px;
        }
        .faq-trigger:hover {
            color: var(--cyan-glow);
        }
        .faq-trigger .faq-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.06);
            transition: all var(--transition-smooth);
            font-size: 16px;
            color: var(--cyan-glow);
            font-weight: 700;
        }
        .faq-item.open .faq-trigger .faq-icon {
            transform: rotate(45deg);
            background: rgba(0, 229, 255, 0.15);
        }
        .faq-panel {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 8px;
        }
        .faq-item.open .faq-panel {
            max-height: 300px;
            padding: 0 8px 20px 8px;
        }
        .faq-panel p {
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1100;
            padding: 8px;
            background: transparent;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: all 0.35s ease;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }
        .mobile-drawer {
            position: fixed;
            top: 0;
            right: -100%;
            width: 100%;
            max-width: 380px;
            height: 100vh;
            background: rgba(10, 14, 27, 0.95);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            z-index: 1050;
            transition: right 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 100px 36px 40px;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .mobile-drawer.open {
            right: 0;
        }
        .mobile-drawer .nav-link {
            font-size: 18px;
            padding: 14px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            display: block;
        }
        .mobile-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.55);
            z-index: 1040;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.4s ease;
        }
        .mobile-overlay.show {
            opacity: 1;
            pointer-events: auto;
        }

        /* 对比滑块 */
        .comparison-bar {
            height: 8px;
            border-radius: 4px;
            overflow: hidden;
            background: rgba(255, 255, 255, 0.08);
        }
        .comparison-bar-fill {
            height: 100%;
            border-radius: 4px;
            transition: width 1.2s ease;
        }
        .comparison-bar-fill.old {
            background: #6B7280;
        }
        .comparison-bar-fill.new {
            background: linear-gradient(90deg, var(--electric-purple), var(--cyan-glow));
        }

        /* 分区标题下划线 */
        .section-underline {
            width: 60px;
            height: 4px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--electric-purple), var(--cyan-glow));
            margin: 0 auto;
        }

        /* 联系人表单 */
        .contact-card {
            background: rgba(15, 18, 40, 0.85);
            border: 1px solid var(--border-subtle);
            border-radius: 32px;
            box-shadow: var(--shadow-glow);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            overflow: hidden;
        }
        .input-field {
            width: 100%;
            padding: 14px 18px;
            border-radius: 12px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #fff;
            font-size: 15px;
            transition: all var(--transition-smooth);
        }
        .input-field:focus {
            border-color: var(--electric-purple);
            box-shadow: 0 0 20px rgba(108, 59, 252, 0.2);
            background: rgba(255, 255, 255, 0.08);
        }
        .input-field::placeholder {
            color: var(--text-muted);
        }

        /* 页脚 */
        .footer-divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
            width: 100%;
        }
        .back-to-top {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: #fff;
            cursor: pointer;
            transition: all var(--transition-smooth);
            font-size: 20px;
        }
        .back-to-top:hover {
            background: rgba(108, 59, 252, 0.25);
            border-color: var(--electric-purple);
            box-shadow: 0 0 20px rgba(108, 59, 252, 0.3);
            transform: translateY(-3px);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .container-custom {
                padding: 0 20px;
            }
            .hero-section {
                min-height: auto;
                padding: 140px 0 80px;
            }
        }
        @media (max-width: 768px) {
            .hamburger {
                display: flex;
            }
            .nav-desktop-links,
            .nav-desktop-cta {
                display: none !important;
            }
            .nav-glass {
                padding: 10px 0;
            }
            .container-custom {
                padding: 0 16px;
            }
            .hero-section {
                padding: 120px 0 60px;
                text-align: center;
            }
            .hero-buttons {
                justify-content: center;
                flex-wrap: wrap;
            }
            .float-badges-wrap {
                justify-content: center;
                margin-top: 32px;
            }
            .section-spacing {
                padding: 60px 0;
            }
            .metric-number {
                font-size: 40px;
            }
            .card-glass {
                border-radius: 18px;
            }
            .contact-card {
                border-radius: 20px;
            }
        }
        @media (max-width: 520px) {
            .btn-primary,
            .btn-secondary {
                padding: 12px 22px;
                font-size: 14px;
                width: 100%;
                justify-content: center;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 12px;
            }
            h1 {
                font-size: 30px !important;
            }
            h2 {
                font-size: 24px !important;
            }
            h3 {
                font-size: 18px !important;
            }
            .metric-number {
                font-size: 32px;
            }
            .section-spacing {
                padding: 40px 0;
            }
            .mobile-drawer {
                max-width: 100%;
            }
        }

        .section-spacing {
            padding: 100px 0;
        }
        @media (min-width: 769px) {
            .mobile-drawer,
            .mobile-overlay {
                display: none !important;
            }
        }