/* roulang page: index */
:root {
            --flame: #F04E23;
            --midnight: #0B0C10;
            --neon: #C0FB50;
            --deep: #1A1D23;
            --soft: #F5F5F7;
            --card-border: #E5E7EB;
            --text-body: #2D2F36;
            --text-muted: #6B7280;
            --radius-btn: 8px;
            --radius-card: 12px;
            --radius-pill: 999px;
            --nav-height: 72px;
            --nav-height-mobile: 60px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s ease;
        }

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

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

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", system-ui, sans-serif;
            line-height: 1.6;
            color: var(--text-body);
            background-color: var(--soft);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: var(--transition-fast);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }

        input,
        textarea {
            font-family: inherit;
            outline: none;
            transition: border-color var(--transition-fast);
        }

        input:focus,
        textarea:focus {
            border-color: var(--flame) !important;
            box-shadow: none !important;
            outline: none !important;
        }

        /* 导航 */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--nav-height);
            background: rgba(11, 12, 16, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            display: flex;
            align-items: center;
            transition: var(--transition-smooth);
        }

        .nav-container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.25rem;
            color: #fff;
            white-space: nowrap;
            letter-spacing: 0.02em;
            flex-shrink: 0;
        }

        .nav-logo .logo-icon {
            width: 34px;
            height: 34px;
            flex-shrink: 0;
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 40px;
            list-style: none;
        }

        .nav-links a {
            color: #ccc;
            font-size: 0.95rem;
            font-weight: 500;
            position: relative;
            padding: 6px 0;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }

        .nav-links a:hover {
            color: var(--neon);
            text-shadow: 0 0 18px rgba(192, 251, 80, 0.35);
        }

        .nav-links a.active {
            color: #fff;
        }

        .nav-links a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 3px;
            background: var(--flame);
            border-radius: 3px 3px 0 0;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            z-index: 1100;
        }

        .hamburger span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: #fff;
            border-radius: 2px;
            transition: var(--transition-fast);
        }

        .hamburger.open span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.open span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100vh;
            background: rgba(11, 12, 16, 0.97);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1050;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 28px;
            opacity: 0;
            pointer-events: none;
            transition: opacity var(--transition-smooth);
        }

        .mobile-menu.open {
            opacity: 1;
            pointer-events: all;
        }

        .mobile-menu a {
            font-size: 1.35rem;
            font-weight: 600;
            color: #fff;
            letter-spacing: 0.04em;
            transition: color var(--transition-fast);
        }
        .mobile-menu a:hover {
            color: var(--neon);
        }

        /* Hero */
        #hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
            background: linear-gradient(15deg, rgba(11, 12, 16, 0.88) 0%, rgba(240, 78, 35, 0.18) 65%, rgba(11, 12, 16, 0.82) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            background-blend-mode: overlay;
        }

        #hero::after {
            content: '';
            position: absolute;
            right: -5%;
            top: 10%;
            width: 55%;
            height: 90%;
            background: url('/assets/images/backpic/back-1.webp') right center/contain no-repeat;
            opacity: 0.22;
            pointer-events: none;
            filter: brightness(0.6) contrast(1.3);
            mask-image: linear-gradient(to left, rgba(0, 0, 0, 0.7) 30%, rgba(0, 0, 0, 0) 100%);
            -webkit-mask-image: linear-gradient(to left, rgba(0, 0, 0, 0.7) 30%, rgba(0, 0, 0, 0) 100%);
        }

        .hero-container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            min-height: 100vh;
        }

        .hero-content {
            max-width: 620px;
            padding-top: 60px;
        }

        .hero-content h1 {
            font-size: 56px;
            font-weight: 800;
            line-height: 1.15;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: -0.01em;
        }
        .hero-content h1 .highlight {
            color: var(--flame);
            position: relative;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.78);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 500px;
        }

        .hero-buttons {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: var(--flame);
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-btn);
            border: 2px solid var(--flame);
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: transparent;
            border-color: var(--neon);
            color: var(--neon);
            box-shadow: 0 0 28px rgba(192, 251, 80, 0.22);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 32px;
            background: transparent;
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            border-radius: var(--radius-btn);
            border: 2px solid rgba(255, 255, 255, 0.55);
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .btn-ghost:hover {
            background: var(--flame);
            border-color: var(--flame);
            color: #fff;
        }

        .hero-badge {
            position: absolute;
            right: 40px;
            bottom: 50px;
            z-index: 3;
            background: rgba(11, 12, 16, 0.75);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid rgba(255, 255, 255, 0.2);
            border-radius: var(--radius-pill);
            padding: 10px 22px;
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: #ccc;
            white-space: nowrap;
        }
        .hero-badge .badge-num {
            color: var(--neon);
            font-weight: 700;
            font-family: "Inter", "SF Mono", "DIN", "Helvetica Neue", monospace;
            font-size: 1.2rem;
        }

        /* 区块通用 */
        .section-block {
            padding: 80px 24px;
            position: relative;
        }
        .section-block.dark {
            background: var(--deep);
            color: #ddd;
        }
        .section-block.light {
            background: var(--soft);
            color: var(--text-body);
        }
        .section-block.warm-light {
            background: #f0ede8;
            color: var(--text-body);
        }
        .section-container {
            max-width: 1280px;
            margin: 0 auto;
        }
        .section-title {
            font-size: 40px;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 1rem;
            color: var(--text-muted);
            margin-bottom: 48px;
            max-width: 600px;
        }
        .dark .section-subtitle {
            color: #aaa;
        }

        /* Metrics */
        #metrics .metrics-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 0.9fr;
            gap: 32px;
            margin-bottom: 20px;
        }
        .metric-card {
            text-align: center;
            padding: 28px 20px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: var(--radius-card);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .metric-number {
            font-family: "Inter", "SF Mono", "DIN", "Helvetica Neue", monospace;
            font-size: 3.2rem;
            font-weight: 700;
            color: var(--neon);
            line-height: 1;
            margin-bottom: 8px;
            letter-spacing: -0.02em;
        }
        .metric-label {
            font-size: 0.9rem;
            color: #aaa;
            letter-spacing: 0.03em;
        }
        .metric-bars {
            display: flex;
            align-items: flex-end;
            justify-content: center;
            gap: 5px;
            height: 42px;
            margin-top: 14px;
        }
        .metric-bars .bar {
            width: 10px;
            background: var(--flame);
            border-radius: 3px 3px 0 0;
            animation: barRise 0.8s ease-out forwards;
            transform-origin: bottom;
        }
        .bar:nth-child(1) {
            height: 60%;
            animation-delay: 0.1s;
        }
        .bar:nth-child(2) {
            height: 85%;
            animation-delay: 0.2s;
        }
        .bar:nth-child(3) {
            height: 45%;
            animation-delay: 0.3s;
        }
        .bar:nth-child(4) {
            height: 95%;
            animation-delay: 0.4s;
        }
        .bar:nth-child(5) {
            height: 70%;
            animation-delay: 0.5s;
        }
        .bar:nth-child(6) {
            height: 55%;
            animation-delay: 0.6s;
        }

        @keyframes barRise {
            from {
                transform: scaleY(0);
            }
            to {
                transform: scaleY(1);
            }
        }

        .metrics-note {
            text-align: center;
            font-size: 0.8rem;
            color: #777;
            letter-spacing: 0.04em;
        }

        /* Services */
        #services .services-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            align-items: start;
        }
        .service-card {
            background: #fff;
            border: 1px solid var(--card-border);
            border-radius: var(--radius-card);
            padding: 28px 24px 24px 20px;
            display: flex;
            gap: 16px;
            transition: all var(--transition-smooth);
            position: relative;
            overflow: hidden;
            align-items: flex-start;
        }
        .service-card::before {
            content: '';
            position: absolute;
            left: 0;
            top: 16px;
            bottom: 16px;
            width: 4px;
            background: var(--flame);
            border-radius: 0 3px 3px 0;
        }
        .service-card:hover {
            box-shadow: 0 8px 20px rgba(192, 251, 80, 0.08);
            transform: translateX(4px);
            border-color: #d1d5db;
        }
        .service-icon-wrap {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--flame);
            margin-top: 4px;
        }
        .service-icon-wrap svg {
            width: 36px;
            height: 36px;
            stroke: var(--flame);
            fill: none;
            stroke-width: 1.8;
        }
        .service-info h3 {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-body);
            margin-bottom: 6px;
        }
        .service-info p {
            font-size: 0.9rem;
            color: var(--text-muted);
            line-height: 1.55;
            margin-bottom: 10px;
        }
        .service-info .detail-link {
            font-size: 0.85rem;
            color: var(--flame);
            font-weight: 600;
            cursor: pointer;
            transition: color var(--transition-fast);
            display: inline-block;
        }
        .service-info .detail-link:hover {
            color: #d0401a;
            text-decoration: underline;
        }

        /* Results */
        #results .results-wrapper {
            display: flex;
            align-items: stretch;
            gap: 0;
            position: relative;
        }
        .results-col {
            flex: 1;
            background: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            border: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
        .results-col h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #ccc;
            margin-bottom: 4px;
            text-align: center;
        }
        .results-col.right-col h3 {
            color: var(--neon);
        }
        .result-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 14px 16px;
            background: rgba(0, 0, 0, 0.25);
            border-radius: 8px;
            font-size: 0.95rem;
        }
        .result-item .metric-name {
            color: #bbb;
            flex-shrink: 0;
        }
        .result-item .metric-val {
            font-family: "Inter", "SF Mono", "DIN", "Helvetica Neue", monospace;
            font-weight: 700;
            font-size: 1.15rem;
            color: #ddd;
        }
        .right-col .result-item .metric-val {
            color: var(--neon);
        }
        .vs-badge {
            position: absolute;
            left: 50%;
            top: 50%;
            transform: translate(-50%, -50%);
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--flame);
            color: #fff;
            font-weight: 800;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 5;
            box-shadow: 0 0 30px rgba(240, 78, 35, 0.5);
            letter-spacing: 0.04em;
        }
        .boost-tag {
            display: inline-block;
            background: var(--flame);
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            padding: 6px 16px;
            border-radius: var(--radius-pill);
            letter-spacing: 0.03em;
            margin-top: 6px;
            align-self: center;
            animation: pulseTag 2s ease-in-out infinite;
        }
        @keyframes pulseTag {
            0%,
            100% {
                box-shadow: 0 0 0 rgba(240, 78, 35, 0);
            }
            50% {
                box-shadow: 0 0 22px rgba(240, 78, 35, 0.55);
            }
        }
        .client-logos {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }
        .client-logos img {
            height: 38px;
            width: auto;
            filter: grayscale(100%) brightness(1.6);
            opacity: 0.6;
            transition: all var(--transition-fast);
            border-radius: 4px;
        }
        .client-logos img:hover {
            filter: grayscale(0%) brightness(1);
            opacity: 1;
        }

        /* FAQ */
        #faq .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            border: 1px solid #e0e0e0;
            border-radius: var(--radius-card);
            overflow: hidden;
            background: #fff;
            transition: all var(--transition-smooth);
        }
        .faq-question {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 18px 20px;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-body);
            user-select: none;
            transition: color var(--transition-fast);
        }
        .faq-question:hover {
            color: var(--flame);
        }
        .faq-icon {
            flex-shrink: 0;
            width: 26px;
            height: 26px;
            border-radius: 50%;
            background: var(--flame);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 1.1rem;
            transition: transform var(--transition-smooth);
            line-height: 1;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: #c0401a;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-smooth), padding var(--transition-smooth);
            background: #F0F2F5;
            padding: 0 20px 0 60px;
            font-size: 0.9rem;
            color: #555;
            line-height: 1.65;
        }
        .faq-item.open .faq-answer {
            max-height: 220px;
            padding: 16px 20px 18px 60px;
        }

        /* CTA */
        #cta .cta-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr;
            gap: 40px;
            align-items: start;
        }
        .cta-form {
            background: #fff;
            border-radius: var(--radius-card);
            padding: 32px 28px;
            border: 1px solid var(--card-border);
        }
        .cta-form .form-group {
            margin-bottom: 16px;
        }
        .cta-form label {
            display: block;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-body);
            margin-bottom: 5px;
        }
        .cta-form input,
        .cta-form textarea {
            width: 100%;
            padding: 12px 14px;
            border: 1.5px solid #d1d5db;
            border-radius: 6px;
            font-size: 0.95rem;
            background: #fafafa;
            resize: vertical;
            transition: border-color var(--transition-fast);
        }
        .cta-form textarea {
            min-height: 90px;
        }
        .btn-submit {
            width: 100%;
            padding: 15px;
            background: var(--flame);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: var(--radius-btn);
            border: none;
            cursor: pointer;
            letter-spacing: 0.03em;
            transition: background var(--transition-fast), box-shadow var(--transition-fast);
        }
        .btn-submit:hover {
            background: #d9441a;
            box-shadow: 0 6px 24px rgba(240, 78, 35, 0.3);
        }
        .cta-assurance {
            display: flex;
            flex-direction: column;
            gap: 20px;
            padding-top: 8px;
        }
        .assurance-item {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 0.9rem;
            color: #555;
        }
        .assurance-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #e8e6e0;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            font-size: 1.2rem;
        }

        /* 页脚 */
        .site-footer {
            background: var(--midnight);
            color: #888;
            padding: 28px 24px;
            text-align: center;
            font-size: 0.85rem;
            letter-spacing: 0.03em;
        }
        .footer-inner {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-logo-text {
            font-weight: 700;
            color: #ccc;
            font-size: 0.95rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 28px;
            right: 28px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--flame);
            color: #fff;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 900;
            cursor: pointer;
            box-shadow: 0 4px 16px rgba(240, 78, 35, 0.35);
            transition: all var(--transition-fast);
            border: none;
        }
        .back-to-top:hover {
            background: #d9441a;
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(240, 78, 35, 0.45);
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            #services .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-content h1 {
                font-size: 42px;
            }
            .section-title {
                font-size: 34px;
            }
            #metrics .metrics-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            #metrics .metrics-grid .metric-card:last-child {
                grid-column: span 2;
                max-width: 400px;
                justify-self: center;
            }
            .results-wrapper {
                flex-direction: column;
                gap: 20px;
            }
            .vs-badge {
                position: relative;
                left: auto;
                top: auto;
                transform: none;
                margin: -10px auto;
                z-index: 3;
            }
            #cta .cta-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        @media (max-width: 768px) {
            .site-nav {
                height: var(--nav-height-mobile);
            }
            html {
                scroll-padding-top: var(--nav-height-mobile);
            }
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .mobile-menu {
                display: flex;
            }
            #hero {
                min-height: 100vh;
                background-position: 55% center;
            }
            #hero::after {
                width: 80%;
                right: -20%;
                opacity: 0.14;
            }
            .hero-content h1 {
                font-size: 36px;
            }
            .hero-subtitle {
                font-size: 1rem;
            }
            .hero-badge {
                right: 16px;
                bottom: 28px;
                font-size: 0.78rem;
                padding: 8px 16px;
            }
            .hero-badge .badge-num {
                font-size: 1rem;
            }
            .section-block {
                padding: 56px 16px;
            }
            .section-title {
                font-size: 30px;
            }
            #services .services-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            #metrics .metrics-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            #metrics .metrics-grid .metric-card:last-child {
                grid-column: span 1;
                max-width: none;
            }
            .metric-number {
                font-size: 2.4rem;
            }
            .results-wrapper {
                flex-direction: column;
                gap: 8px;
            }
            .results-col {
                padding: 20px 16px;
            }
            .vs-badge {
                width: 44px;
                height: 44px;
                font-size: 0.9rem;
                margin: 4px auto;
            }
            .client-logos img {
                height: 28px;
            }
            #cta .cta-grid {
                grid-template-columns: 1fr;
            }
            .btn-primary,
            .btn-ghost {
                padding: 12px 24px;
                font-size: 0.9rem;
            }
            .faq-answer {
                padding: 0 16px 0 50px;
            }
            .faq-item.open .faq-answer {
                padding: 14px 16px 16px 50px;
            }
            .footer-inner {
                flex-direction: column;
                text-align: center;
            }
            .back-to-top {
                bottom: 18px;
                right: 16px;
                width: 38px;
                height: 38px;
                font-size: 1.1rem;
            }
        }

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 30px;
            }
            .hero-subtitle {
                font-size: 0.9rem;
            }
            .hero-buttons {
                flex-direction: column;
                gap: 10px;
            }
            .btn-primary,
            .btn-ghost {
                width: 100%;
                text-align: center;
                justify-content: center;
            }
            .section-title {
                font-size: 26px;
            }
            .metric-number {
                font-size: 2rem;
            }
            .service-card {
                flex-direction: column;
                gap: 10px;
                padding: 20px 16px 18px 16px;
            }
            .service-card::before {
                left: 16px;
                top: auto;
                bottom: 0;
                width: 40px;
                height: 4px;
                border-radius: 3px 3px 0 0;
            }
            .service-icon-wrap {
                margin-top: 0;
            }
        }