/* roulang page: index */
:root {
            --bg-primary: #06060d;
            --bg-secondary: #0d0d1a;
            --bg-card: #111122;
            --bg-card-hover: #161630;
            --text-primary: #f0f0f5;
            --text-secondary: #b0b0c0;
            --text-muted: #707088;
            --accent-cyan: #00e5ff;
            --accent-magenta: #e040fb;
            --accent-purple: #7c3aed;
            --accent-gold: #ffb300;
            --glow-cyan: rgba(0, 229, 255, 0.6);
            --glow-magenta: rgba(224, 64, 251, 0.5);
            --glow-purple: rgba(124, 58, 237, 0.5);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-glow: rgba(0, 229, 255, 0.35);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.5);
            --shadow-glow-cyan: 0 0 20px rgba(0, 229, 255, 0.25), 0 0 50px rgba(0, 229, 255, 0.08);
            --shadow-glow-magenta: 0 0 20px rgba(224, 64, 251, 0.25), 0 0 50px rgba(224, 64, 251, 0.08);
            --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-primary);
            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;
            font-family: inherit;
            border: none;
            outline: none;
        }
        input {
            font-family: inherit;
            outline: none;
        }

        /* 导航栏 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(6, 6, 13, 0.85);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
        }
        .site-header.scrolled {
            background: rgba(6, 6, 13, 0.95);
            box-shadow: 0 2px 30px rgba(0, 0, 0, 0.7);
            border-bottom-color: var(--border-glow);
        }
        .header-inner {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        .logo-link {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            color: #fff;
            position: relative;
            z-index: 1001;
            transition: text-shadow var(--transition-fast);
        }
        .logo-link:hover {
            text-shadow: 0 0 18px var(--glow-cyan), 0 0 36px var(--glow-cyan);
        }
        .logo-icon {
            width: 38px;
            height: 38px;
            border-radius: var(--radius-sm);
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            box-shadow: 0 0 16px var(--glow-cyan);
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            display: inline-block;
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition-fast);
            position: relative;
            white-space: nowrap;
        }
        .nav-links a:hover,
        .nav-links a:focus-visible {
            color: #fff;
            background: rgba(255, 255, 255, 0.06);
        }
        .nav-links a.nav-cta {
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            color: #fff;
            font-weight: 600;
            padding: 9px 20px;
            border-radius: 22px;
            box-shadow: 0 0 14px var(--glow-cyan);
            transition: all var(--transition-smooth);
        }
        .nav-links a.nav-cta:hover {
            box-shadow: 0 0 28px var(--glow-cyan), 0 0 50px var(--glow-purple);
            transform: translateY(-1px);
        }
        .mobile-toggle {
            display: none;
            background: none;
            color: #fff;
            font-size: 1.6rem;
            z-index: 1001;
            padding: 8px;
            border-radius: 8px;
            transition: background var(--transition-fast);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        /* 容器 */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-padding {
            padding: 90px 0;
        }

        /* Hero */
        .hero-section {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            background-attachment: fixed;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(6, 6, 13, 0.75) 0%, rgba(6, 6, 13, 0.55) 40%, rgba(6, 6, 13, 0.85) 100%);
            z-index: 1;
        }
        .hero-gridlines {
            position: absolute;
            inset: 0;
            z-index: 0;
            background:
                repeating-linear-gradient(0deg, transparent, transparent 59px, rgba(0, 229, 255, 0.03) 59px, rgba(0, 229, 255, 0.03) 60px),
                repeating-linear-gradient(90deg, transparent, transparent 59px, rgba(0, 229, 255, 0.03) 59px, rgba(0, 229, 255, 0.03) 60px);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 800px;
            padding: 40px 20px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 20px;
            background: rgba(0, 229, 255, 0.1);
            border: 1px solid rgba(0, 229, 255, 0.3);
            color: var(--accent-cyan);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            margin-bottom: 20px;
            animation: badgePulse 3s ease-in-out infinite;
        }
        @keyframes badgePulse {
            0%,
            100% {
                box-shadow: 0 0 8px rgba(0, 229, 255, 0.2);
            }
            50% {
                box-shadow: 0 0 22px rgba(0, 229, 255, 0.5);
            }
        }
        .hero-title {
            font-size: clamp(2.6rem, 6vw, 4.5rem);
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: 0.01em;
            color: #fff;
            margin: 0 0 18px;
            text-shadow: 0 0 30px rgba(0, 229, 255, 0.5), 0 0 70px rgba(0, 229, 255, 0.2), 0 0 120px rgba(124, 58, 237, 0.25);
            animation: titleGlow 4s ease-in-out infinite;
        }
        @keyframes titleGlow {
            0%,
            100% {
                text-shadow: 0 0 30px rgba(0, 229, 255, 0.5), 0 0 70px rgba(0, 229, 255, 0.2), 0 0 120px rgba(124, 58, 237, 0.25);
            }
            50% {
                text-shadow: 0 0 40px rgba(0, 229, 255, 0.7), 0 0 90px rgba(0, 229, 255, 0.35), 0 0 150px rgba(224, 64, 251, 0.4);
            }
        }
        .hero-subtitle {
            font-size: clamp(1.05rem, 2vw, 1.3rem);
            color: var(--text-secondary);
            max-width: 580px;
            margin: 0 auto 36px;
            line-height: 1.6;
            letter-spacing: 0.02em;
        }
        .hero-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 30px;
            border-radius: 28px;
            font-size: 1rem;
            font-weight: 600;
            letter-spacing: 0.03em;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent-cyan), #009faf);
            color: #000;
            box-shadow: 0 0 22px var(--glow-cyan), 0 4px 20px rgba(0, 0, 0, 0.4);
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .btn-primary:hover {
            box-shadow: 0 0 38px var(--glow-cyan), 0 0 70px var(--glow-purple), 0 6px 28px rgba(0, 0, 0, 0.5);
            transform: translateY(-2px);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 1.5px solid rgba(255, 255, 255, 0.3);
            backdrop-filter: blur(6px);
        }
        .btn-outline:hover {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.3);
            background: rgba(0, 229, 255, 0.06);
            transform: translateY(-2px);
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
        }

        /* 板块标题 */
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 10px;
            padding: 4px 14px;
            border-radius: 12px;
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .section-heading {
            font-size: clamp(1.8rem, 3.5vw, 2.6rem);
            font-weight: 800;
            color: #fff;
            margin: 0 0 14px;
            letter-spacing: 0.01em;
        }
        .section-desc {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto 50px;
            line-height: 1.65;
        }
        .text-center {
            text-align: center;
        }

        /* 卡片 */
        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 28px 24px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, transparent, var(--accent-cyan), transparent);
            opacity: 0;
            transition: opacity var(--transition-smooth);
        }
        .card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow-cyan);
            transform: translateY(-4px);
        }
        .card:hover::before {
            opacity: 1;
        }
        .card-icon {
            width: 50px;
            height: 50px;
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            margin-bottom: 16px;
            flex-shrink: 0;
        }
        .card-icon.cyan {
            background: rgba(0, 229, 255, 0.12);
            color: var(--accent-cyan);
        }
        .card-icon.magenta {
            background: rgba(224, 64, 251, 0.12);
            color: var(--accent-magenta);
        }
        .card-icon.gold {
            background: rgba(255, 179, 0, 0.12);
            color: var(--accent-gold);
        }
        .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 8px;
        }
        .card-text {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
            margin: 0;
            flex-grow: 1;
        }

        /* 服务卡片（带图片） */
        .service-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-smooth);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .service-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-glow-cyan);
            transform: translateY(-5px);
        }
        .service-card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
        }
        .service-card-body {
            padding: 22px 20px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .service-card-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: #fff;
            margin: 0 0 8px;
        }
        .service-card-text {
            color: var(--text-secondary);
            font-size: 0.88rem;
            line-height: 1.55;
            margin: 0;
            flex-grow: 1;
        }
        .service-card-tag {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: 10px;
            background: rgba(0, 229, 255, 0.1);
            color: var(--accent-cyan);
            margin-top: 12px;
            align-self: flex-start;
            letter-spacing: 0.04em;
        }

        /* 流程 */
        .process-step {
            display: flex;
            align-items: flex-start;
            gap: 18px;
            position: relative;
            padding: 20px 0;
        }
        .process-step:not(:last-child)::after {
            content: '';
            position: absolute;
            left: 22px;
            top: 56px;
            bottom: 0;
            width: 2px;
            background: linear-gradient(180deg, var(--accent-cyan), transparent);
            opacity: 0.5;
        }
        .process-num {
            width: 46px;
            height: 46px;
            border-radius: 50%;
            flex-shrink: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.1rem;
            color: #fff;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
            box-shadow: 0 0 18px var(--glow-cyan);
            z-index: 1;
        }
        .process-body h4 {
            margin: 0 0 4px;
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
        }
        .process-body p {
            margin: 0;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.5;
        }

        /* 数据统计 */
        .stat-block {
            text-align: center;
            padding: 20px;
        }
        .stat-number {
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 900;
            color: #fff;
            letter-spacing: 0.02em;
            text-shadow: 0 0 20px var(--glow-cyan);
        }
        .stat-label {
            color: var(--text-secondary);
            font-size: 0.9rem;
            margin-top: 4px;
            letter-spacing: 0.04em;
        }

        /* FAQ */
        .faq-item {
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            background: var(--bg-card);
            margin-bottom: 12px;
            overflow: hidden;
            transition: all var(--transition-fast);
        }
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        .faq-item summary {
            padding: 18px 22px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: #fff;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            transition: color var(--transition-fast);
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.75rem;
            color: var(--accent-cyan);
            transition: transform var(--transition-fast);
            flex-shrink: 0;
        }
        .faq-item[open] summary {
            color: var(--accent-cyan);
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 22px 18px;
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        /* CTA */
        .cta-section {
            position: relative;
            background: url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            background-attachment: fixed;
            overflow: hidden;
        }
        .cta-overlay {
            position: absolute;
            inset: 0;
            background: rgba(6, 6, 13, 0.8);
            z-index: 1;
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-input-group {
            display: flex;
            gap: 10px;
            max-width: 480px;
            margin: 0 auto;
            flex-wrap: wrap;
            justify-content: center;
        }
        .cta-input {
            flex: 1;
            min-width: 220px;
            padding: 14px 20px;
            border-radius: 28px;
            border: 1.5px solid rgba(255, 255, 255, 0.25);
            background: rgba(255, 255, 255, 0.05);
            color: #fff;
            font-size: 0.95rem;
            backdrop-filter: blur(6px);
            transition: all var(--transition-fast);
        }
        .cta-input:focus {
            border-color: var(--accent-cyan);
            box-shadow: 0 0 16px rgba(0, 229, 255, 0.3);
            background: rgba(255, 255, 255, 0.08);
            outline: none;
        }
        .cta-input::placeholder {
            color: rgba(255, 255, 255, 0.4);
        }

        /* 页脚 */
        .site-footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-subtle);
            padding: 50px 0 30px;
            color: var(--text-muted);
            font-size: 0.85rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            margin: 0 0 12px;
            letter-spacing: 0.03em;
        }
        .footer-col ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .footer-col ul li {
            margin-bottom: 7px;
        }
        .footer-col ul li a {
            color: var(--text-muted);
            transition: color var(--transition-fast);
            font-size: 0.85rem;
        }
        .footer-col ul li a:hover {
            color: var(--accent-cyan);
        }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            text-align: center;
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .section-padding {
                padding: 60px 0;
            }
            .hero-section {
                background-attachment: scroll;
            }
            .cta-section {
                background-attachment: scroll;
            }
            .header-inner {
                height: 56px;
            }
            .nav-links a {
                padding: 6px 10px;
                font-size: 0.82rem;
            }
            .nav-links a.nav-cta {
                padding: 7px 14px;
                font-size: 0.82rem;
            }
        }
        @media (max-width: 768px) {
            .mobile-toggle {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                width: 280px;
                height: 100vh;
                flex-direction: column;
                background: rgba(13, 13, 26, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                padding: 80px 28px 30px;
                gap: 4px;
                transition: right var(--transition-smooth);
                border-left: 1px solid var(--border-subtle);
                z-index: 1000;
                align-items: stretch;
            }
            .nav-links.active {
                right: 0;
            }
            .nav-links a {
                display: block;
                padding: 12px 16px;
                border-radius: 10px;
                font-size: 0.95rem;
                text-align: left;
            }
            .nav-links a.nav-cta {
                text-align: center;
                margin-top: 8px;
            }
            .hero-section {
                min-height: 90vh;
            }
            .hero-title {
                font-size: clamp(2rem, 7vw, 2.8rem);
            }
            .section-heading {
                font-size: 1.6rem;
            }
            .card {
                padding: 20px 16px;
            }
            .service-card-img {
                height: 160px;
            }
            .process-step {
                gap: 12px;
            }
            .process-num {
                width: 38px;
                height: 38px;
                font-size: 0.95rem;
            }
            .process-step:not(:last-child)::after {
                left: 18px;
                top: 48px;
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .header-inner {
                padding: 0 14px;
            }
            .container {
                padding: 0 14px;
            }
            .section-padding {
                padding: 40px 0;
            }
            .hero-content {
                padding: 30px 10px;
            }
            .hero-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 300px;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .section-heading {
                font-size: 1.4rem;
            }
            .section-desc {
                font-size: 0.9rem;
                margin-bottom: 30px;
            }
            .card {
                padding: 16px 12px;
            }
            .service-card-img {
                height: 140px;
            }
            .cta-input-group {
                flex-direction: column;
                align-items: center;
            }
            .cta-input {
                min-width: auto;
                width: 100%;
                max-width: 320px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .nav-links {
                width: 260px;
            }
            .stat-number {
                font-size: 1.6rem;
            }
        }
        @media (max-width: 380px) {
            .hero-title {
                font-size: 1.5rem;
            }
            .logo-link {
                font-size: 1.2rem;
            }
            .logo-icon {
                width: 30px;
                height: 30px;
                font-size: 0.9rem;
            }
            .btn {
                padding: 12px 20px;
                font-size: 0.9rem;
            }
        }