/* roulang page: index */
:root {
            --bg-deep: #0F0A1E;
            --bg-card: #F7F4EF;
            --accent: #FF5F1F;
            --accent-glow: rgba(255, 95, 31, 0.5);
            --purple: #A855F7;
            --purple-glow: rgba(168, 85, 247, 0.35);
            --text-light: #D1D5DB;
            --text-dark: #1F1B2D;
            --text-muted: #9CA3AF;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.12);
            --radius-lg: 12px;
            --radius-sm: 8px;
            --radius-pill: 40px;
            --shadow-card: 0px 4px 20px rgba(0, 0, 0, 0.08);
            --max-width: 1200px;
            --transition: 0.25s 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', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', 'SF Pro Display', system-ui, -apple-system, sans-serif;
            font-size: 16px;
            line-height: 1.625;
            color: var(--text-light);
            background-color: var(--bg-deep);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

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

        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ========== 导航 ========== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(15, 10, 30, 0.82);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            transition: background var(--transition);
        }
        .site-header.scrolled {
            background: rgba(15, 10, 30, 0.94);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: baseline;
            gap: 4px;
            font-weight: 700;
            color: #F7F4EF;
            letter-spacing: 0.5px;
            position: relative;
            white-space: nowrap;
        }
        .logo-main {
            font-size: 22px;
            letter-spacing: 1px;
        }
        .logo-sub {
            font-size: 13px;
            font-weight: 500;
            color: var(--accent);
            letter-spacing: 0;
            margin-left: 2px;
        }
        .logo-dot {
            position: absolute;
            width: 5px;
            height: 5px;
            background: var(--purple);
            border-radius: 50%;
            top: -2px;
            right: -10px;
            animation: logoGlow 2s ease-in-out infinite;
            box-shadow: 0 0 8px var(--purple-glow);
        }
        @keyframes logoGlow {
            0%,
            100% {
                opacity: 0.5;
                transform: scale(1);
            }
            50% {
                opacity: 1;
                transform: scale(1.6);
            }
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }
        .nav-links a {
            font-size: 15px;
            font-weight: 600;
            color: #D1D5DB;
            position: relative;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
            transition: width var(--transition);
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--accent);
        }
        .nav-links a:hover::after,
        .nav-links a.active::after {
            width: 100%;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            z-index: 1001;
            background: none;
            border: none;
        }
        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #F7F4EF;
            border-radius: 2px;
            transition: all var(--transition);
            transform-origin: center;
        }
        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 64px;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(15, 10, 30, 0.97);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            z-index: 999;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 40px;
            opacity: 0;
            pointer-events: none;
            transition: opacity 0.35s ease;
        }
        .mobile-menu.open {
            display: flex;
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-menu a {
            font-size: 20px;
            font-weight: 700;
            color: #F7F4EF;
            letter-spacing: 1px;
            transition: color var(--transition);
        }
        .mobile-menu a:hover,
        .mobile-menu a.active {
            color: var(--accent);
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--bg-deep);
            overflow: hidden;
            padding: 100px 24px 80px;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(15, 10, 30, 0.55) 0%, rgba(15, 10, 30, 0.85) 60%, rgba(15, 10, 30, 0.95) 100%);
            z-index: 1;
        }
        .hero-stars {
            position: absolute;
            inset: 0;
            z-index: 2;
            pointer-events: none;
        }
        .star-cluster {
            position: absolute;
            width: 3px;
            height: 3px;
            background: #fff;
            border-radius: 50%;
            animation: twinkle var(--dur) ease-in-out infinite;
            animation-delay: var(--delay);
        }
        @keyframes twinkle {
            0%,
            100% {
                opacity: 0.3;
                box-shadow: none;
            }
            50% {
                opacity: 1;
                box-shadow: 0 0 6px 2px rgba(255, 255, 255, 0.7);
            }
        }
        .hero-content {
            position: relative;
            z-index: 3;
            max-width: 780px;
            margin: 0 auto;
        }
        .hero h1 {
            font-size: 48px;
            line-height: 1.25;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #FFFFFF;
            margin-bottom: 20px;
        }
        .hero h1 .accent-word {
            color: var(--accent);
            position: relative;
        }
        .hero-subtitle {
            font-size: 18px;
            line-height: 1.7;
            color: #D1D5DB;
            max-width: 600px;
            margin: 0 auto 36px;
            letter-spacing: 0.3px;
        }
        .hero-cta-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
            margin-bottom: 60px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            height: 48px;
            padding: 0 32px;
            border-radius: var(--radius-pill);
            font-weight: 700;
            font-size: 16px;
            letter-spacing: 0.5px;
            transition: all var(--transition);
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent);
            color: #FFFFFF;
            box-shadow: 0 0 0 0 rgba(255, 95, 31, 0.4);
        }
        .btn-primary:hover {
            background: #FF7733;
            box-shadow: 0 0 20px 4px rgba(255, 95, 31, 0.45);
            transform: scale(1.03);
        }
        .btn-secondary {
            background: transparent;
            color: var(--accent);
            border: 2px solid var(--accent);
        }
        .btn-secondary:hover {
            background: rgba(255, 95, 31, 0.08);
            box-shadow: 0 0 14px 2px rgba(255, 95, 31, 0.2);
            transform: scale(1.03);
        }

        /* 指标看板 */
        .hero-metrics {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            max-width: 720px;
            margin: 0 auto;
        }
        .metric-card {
            flex: 1 1 160px;
            min-width: 140px;
            max-width: 220px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 24px 16px 20px;
            text-align: center;
            transition: all var(--transition);
        }
        .metric-card:hover {
            border-color: rgba(255, 95, 31, 0.3);
            transform: translateY(-2px);
        }
        .metric-number {
            font-size: 56px;
            line-height: 1.15;
            font-weight: 800;
            color: var(--accent);
            font-variant-numeric: tabular-nums;
            font-feature-settings: "tnum";
            letter-spacing: -1px;
        }
        .metric-unit {
            font-size: 20px;
            font-weight: 700;
            color: var(--accent);
            margin-left: 2px;
        }
        .metric-label {
            font-size: 14px;
            color: #9CA3AF;
            margin-top: 6px;
            letter-spacing: 0.5px;
        }

        /* ========== 板块通用 ========== */
        .section {
            padding: 100px 24px;
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-header h2 {
            font-size: 36px;
            line-height: 1.3;
            font-weight: 700;
            color: #FFFFFF;
            letter-spacing: -0.3px;
            margin-bottom: 12px;
        }
        .section-header .section-subtitle {
            font-size: 16px;
            color: #9CA3AF;
            max-width: 560px;
            margin: 0 auto;
        }
        .fade-up {
            opacity: 0;
            transform: translateY(32px);
            transition: opacity 0.7s ease, transform 0.7s ease;
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ========== 服务矩阵 ========== */
        .services-section {
            background: #0d0818;
        }
        .service-row {
            display: grid;
            gap: 24px;
            margin-bottom: 28px;
        }
        .service-row:last-child {
            margin-bottom: 0;
        }
        .service-row.row-a {
            grid-template-columns: 1fr 1.5fr;
        }
        .service-row.row-b {
            grid-template-columns: 1.5fr 1fr;
        }
        .service-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 32px 28px;
            display: flex;
            align-items: center;
            gap: 28px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }
        .service-card:hover {
            border-color: rgba(255, 95, 31, 0.35);
            transform: translateY(-4px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }
        .service-card .service-img-wrap {
            flex-shrink: 0;
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.1);
            position: relative;
        }
        .service-card .service-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .service-card.card-sm .service-img-wrap {
            width: 100px;
            height: 100px;
        }
        .service-card.card-lg .service-img-wrap {
            width: 180px;
            height: 130px;
        }
        .service-card .service-info h3 {
            font-size: 20px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 6px;
            letter-spacing: 0.2px;
        }
        .service-card .service-info p {
            font-size: 15px;
            color: #9CA3AF;
            line-height: 1.6;
            margin-bottom: 8px;
        }
        .service-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 4px;
        }
        .service-tag {
            font-size: 12px;
            font-weight: 600;
            color: var(--accent);
            background: rgba(255, 95, 31, 0.1);
            padding: 4px 10px;
            border-radius: 20px;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }
        .service-icon-accent {
            color: var(--accent);
            font-size: 28px;
            margin-bottom: 8px;
            display: inline-block;
        }

        /* ========== 对比板块 ========== */
        .comparison-section {
            background: var(--bg-deep);
        }
        .comparison-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            max-width: 900px;
            margin: 0 auto;
        }
        .compare-card {
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            transition: all var(--transition);
        }
        .compare-card.weak {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.07);
            color: #9CA3AF;
        }
        .compare-card.strong {
            background: rgba(255, 95, 31, 0.04);
            border: 2px solid rgba(255, 95, 31, 0.35);
            color: #FFFFFF;
            box-shadow: 0 0 28px 6px rgba(255, 95, 31, 0.1), 0 0 60px 2px rgba(168, 85, 247, 0.06);
            position: relative;
        }
        .compare-card.strong::before {
            content: '';
            position: absolute;
            inset: -1px;
            border-radius: var(--radius-lg);
            padding: 1px;
            background: linear-gradient(135deg, rgba(255, 95, 31, 0.5), rgba(168, 85, 247, 0.4));
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
            z-index: 0;
        }
        .compare-card h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 20px;
            letter-spacing: 0.3px;
            text-align: center;
            position: relative;
            z-index: 1;
        }
        .compare-card.strong h3 {
            color: var(--accent);
        }
        .compare-card.weak h3 {
            color: #6B7280;
        }
        .compare-list {
            list-style: none;
            position: relative;
            z-index: 1;
        }
        .compare-list li {
            padding: 10px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 15px;
            line-height: 1.5;
        }
        .compare-list li:last-child {
            border-bottom: none;
        }
        .compare-list .icon-check {
            color: var(--accent);
            font-size: 16px;
            flex-shrink: 0;
        }
        .compare-list .icon-cross {
            color: #6B7280;
            font-size: 16px;
            flex-shrink: 0;
        }

        /* ========== FAQ ========== */
        .faq-section {
            background: #0d0818;
        }
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            overflow: hidden;
        }
        .faq-question {
            width: 100%;
            text-align: left;
            padding: 20px 0;
            font-size: 18px;
            font-weight: 600;
            color: #E5E7EB;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            background: none;
            border: none;
            letter-spacing: 0.2px;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--accent);
        }
        .faq-question .q-mark {
            color: var(--accent);
            font-weight: 700;
            flex-shrink: 0;
            font-size: 18px;
        }
        .faq-question .faq-icon {
            flex-shrink: 0;
            font-size: 14px;
            transition: transform 0.35s ease;
            color: #9CA3AF;
        }
        .faq-item.open .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }
        .faq-answer-wrap {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
        }
        .faq-item.open .faq-answer-wrap {
            max-height: 300px;
        }
        .faq-answer {
            padding: 0 0 20px 28px;
            font-size: 15px;
            line-height: 1.7;
            color: #9CA3AF;
            border-left: 2px solid var(--accent);
            margin-left: 8px;
        }

        /* ========== CTA 表单 ========== */
        .cta-section {
            background: #0b0616;
            padding: 100px 24px;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at center, rgba(168, 85, 247, 0.08) 0%, transparent 70%);
            pointer-events: none;
            z-index: 0;
        }
        .cta-card {
            position: relative;
            z-index: 1;
            background: #FFFFFF;
            border-radius: var(--radius-lg);
            padding: 44px 36px;
            max-width: 480px;
            margin: 0 auto;
            box-shadow: 0 8px 40px rgba(0, 0, 0, 0.25);
        }
        .cta-card h2 {
            font-size: 28px;
            font-weight: 700;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 8px;
            letter-spacing: 0.3px;
        }
        .cta-card .cta-sub {
            text-align: center;
            font-size: 14px;
            color: #6B7280;
            margin-bottom: 28px;
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: #4B5563;
            margin-bottom: 6px;
            letter-spacing: 0.3px;
        }
        .form-group input {
            width: 100%;
            height: 44px;
            border-bottom: 2px solid #E5E7EB;
            font-size: 15px;
            color: var(--text-dark);
            padding: 0 4px;
            transition: border-color var(--transition), box-shadow var(--transition);
            background: transparent;
            border-radius: 0;
        }
        .form-group input:focus {
            border-bottom-color: var(--accent);
            box-shadow: 0 4px 12px -4px rgba(255, 95, 31, 0.3);
        }
        .form-group input::placeholder {
            color: #C4C4C4;
        }
        .btn-submit {
            width: 100%;
            height: 48px;
            background: var(--accent);
            color: #FFFFFF;
            font-size: 18px;
            font-weight: 700;
            border-radius: var(--radius-pill);
            letter-spacing: 1px;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            margin-top: 8px;
            box-shadow: 0 0 0 0 rgba(255, 95, 31, 0.4);
        }
        .btn-submit:hover {
            background: #FF7733;
            box-shadow: 0 0 22px 5px rgba(255, 95, 31, 0.5);
            transform: scale(1.02);
        }
        .privacy-note {
            text-align: center;
            font-size: 12px;
            color: #9CA3AF;
            margin-top: 16px;
        }
        .privacy-note a {
            color: var(--accent);
            cursor: pointer;
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .form-success {
            display: none;
            text-align: center;
            padding: 20px;
            color: #16a34a;
            font-weight: 600;
            font-size: 16px;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: #080412;
            padding: 48px 24px 32px;
            text-align: center;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand {
            font-size: 20px;
            font-weight: 700;
            color: #F7F4EF;
            letter-spacing: 1px;
            margin-bottom: 4px;
        }
        .footer-slogan {
            font-size: 14px;
            color: #9CA3AF;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
        }
        .footer-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
            margin-bottom: 24px;
            list-style: none;
        }
        .footer-nav a {
            font-size: 14px;
            color: #9CA3AF;
            transition: color var(--transition);
            letter-spacing: 0.3px;
        }
        .footer-nav a:hover {
            color: var(--accent);
        }
        .footer-divider {
            width: 60px;
            height: 1px;
            background: rgba(255, 255, 255, 0.12);
            margin: 0 auto 20px;
        }
        .footer-copy {
            font-size: 13px;
            color: #6B7280;
            letter-spacing: 0.3px;
        }
        .footer-copy .domain-info {
            color: #9CA3AF;
            font-weight: 500;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 38px;
            }
            .metric-number {
                font-size: 44px;
            }
            .service-row.row-a,
            .service-row.row-b {
                grid-template-columns: 1fr 1fr;
            }
            .service-card {
                flex-direction: column;
                text-align: center;
                gap: 16px;
                padding: 24px 20px;
            }
            .service-card.card-lg .service-img-wrap {
                width: 120px;
                height: 90px;
            }
            .service-card.card-sm .service-img-wrap {
                width: 80px;
                height: 80px;
            }
            .comparison-grid {
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .hero {
                min-height: auto;
                padding: 80px 16px 60px;
            }
            .hero h1 {
                font-size: 30px;
                line-height: 1.3;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .hero-metrics {
                flex-direction: column;
                align-items: center;
                gap: 14px;
            }
            .metric-card {
                max-width: 100%;
                width: 100%;
                flex: none;
                display: flex;
                align-items: center;
                justify-content: space-between;
                padding: 16px 20px;
                text-align: left;
                gap: 12px;
            }
            .metric-number {
                font-size: 38px;
            }
            .metric-label {
                margin-top: 0;
                font-size: 13px;
            }
            .section {
                padding: 70px 16px;
            }
            .section-header h2 {
                font-size: 28px;
            }
            .service-row.row-a,
            .service-row.row-b {
                grid-template-columns: 1fr;
            }
            .service-card {
                flex-direction: row;
                text-align: left;
                gap: 20px;
                padding: 20px 16px;
            }
            .service-card.card-lg .service-img-wrap {
                width: 90px;
                height: 70px;
                flex-shrink: 0;
            }
            .service-card.card-sm .service-img-wrap {
                width: 70px;
                height: 70px;
                flex-shrink: 0;
            }
            .comparison-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .compare-card {
                padding: 24px 18px;
            }
            .cta-card {
                padding: 30px 20px;
            }
            .btn {
                height: 44px;
                padding: 0 24px;
                font-size: 15px;
            }
            .hero-cta-group {
                gap: 12px;
                margin-bottom: 40px;
            }
            .faq-question {
                font-size: 16px;
                padding: 16px 0;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 26px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .metric-number {
                font-size: 32px;
            }
            .metric-unit {
                font-size: 16px;
            }
            .section-header h2 {
                font-size: 24px;
            }
            .service-card {
                flex-direction: column;
                text-align: center;
                gap: 12px;
                padding: 18px 14px;
            }
            .service-card.card-lg .service-img-wrap,
            .service-card.card-sm .service-img-wrap {
                width: 70px;
                height: 70px;
            }
            .compare-card h3 {
                font-size: 18px;
            }
            .compare-list li {
                font-size: 13px;
                padding: 8px 0;
            }
            .cta-card h2 {
                font-size: 22px;
            }
            .btn-submit {
                font-size: 16px;
                height: 44px;
            }
            .footer-nav {
                gap: 14px;
            }
        }