/* roulang page: index */
:root {
            --lemon: #E9FF5B;
            --lemon-hover: #D4F020;
            --deep-black: #1A1A1A;
            --dark-bg: #2B2B2B;
            --eggshell: #F4F4F0;
            --grass-green: #2D6A4F;
            --white: #FFFFFF;
            --gray-light: #E5E5E0;
            --gray-mid: #9CA3A0;
            --gray-text: #4B4B4B;
            --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
            --card-shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.08);
            --radius-card: 12px;
            --radius-btn: 8px;
            --radius-full: 50px;
            --transition: 0.25s ease;
            --max-width: 1280px;
            --nav-height: 64px;
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
            background-color: var(--eggshell);
            color: var(--deep-black);
            line-height: 1.6;
            margin: 0;
            -webkit-font-smoothing: antialiased;
            font-weight: 400;
            overflow-x: hidden;
        }

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

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

        button, input, select {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }

        .container {
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: 1.5rem;
            padding-right: 1.5rem;
        }

        /* 导航 – 分屏联动 */
        .navbar {
            position: fixed;
            top: 0;
            right: 0;
            width: 60%;
            height: var(--nav-height);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            z-index: 999;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 2.5rem;
            border-bottom: 1px solid rgba(0, 0, 0, 0.03);
            transition: var(--transition);
        }

        .logo {
            font-weight: 800;
            font-size: 1.4rem;
            letter-spacing: -0.3px;
            color: var(--deep-black);
            white-space: nowrap;
        }

        .logo i {
            color: var(--lemon);
            margin-right: 4px;
            font-size: 1.5rem;
            vertical-align: -1px;
            text-shadow: 0 0 6px rgba(233, 255, 91, 0.3);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
            align-items: center;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--gray-text);
            position: relative;
            padding: 4px 0;
        }

        .nav-links a:hover, .nav-links a.active {
            color: var(--deep-black);
        }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--lemon);
            transition: width var(--transition);
        }

        .nav-links a:hover::after {
            width: 100%;
        }

        .btn-nav {
            background: var(--lemon);
            color: var(--deep-black) !important;
            padding: 0.5rem 1.5rem !important;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 0.9rem;
            transition: all var(--transition);
            box-shadow: 0 2px 10px rgba(233, 255, 91, 0.25);
            white-space: nowrap;
        }

        .btn-nav:hover {
            background: var(--lemon-hover);
            box-shadow: 0 0 20px rgba(233, 255, 91, 0.5);
        }

        .burger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            z-index: 1001;
        }

        .burger span {
            width: 24px;
            height: 2px;
            background: var(--deep-black);
            transition: var(--transition);
        }

        /* Hero 分屏 */
        .hero-split {
            display: flex;
            min-height: 100vh;
            background: var(--deep-black);
            position: relative;
            overflow: hidden;
        }

        .hero-visual {
            width: 40%;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            position: relative;
            display: flex;
            align-items: flex-end;
            justify-content: center;
        }

        .hero-visual::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(180deg, rgba(26, 26, 26, 0.1) 0%, rgba(26, 26, 26, 0.8) 100%);
        }

        .hero-data-badge {
            position: relative;
            z-index: 2;
            margin-bottom: 6rem;
            text-align: center;
            color: var(--lemon);
        }

        .hero-data-badge .big-number {
            font-size: 5rem;
            font-weight: 800;
            letter-spacing: -2px;
            line-height: 1;
            font-feature-settings: "tnum";
            text-shadow: 0 0 30px rgba(233, 255, 91, 0.6);
        }

        .hero-data-badge .small-label {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.8);
            margin-top: 0.5rem;
            letter-spacing: 1px;
        }

        .hero-content {
            width: 60%;
            display: flex;
            flex-direction: column;
            justify-content: center;
            padding: 0 4rem;
            padding-top: var(--nav-height);
            color: white;
        }

        .hero-title {
            font-size: 4.5rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 1.5rem;
            letter-spacing: -1px;
            color: white;
        }

        .hero-title span {
            color: var(--lemon);
            text-shadow: 0 0 15px rgba(233, 255, 91, 0.4);
        }

        .hero-sub {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 480px;
            margin-bottom: 2rem;
        }

        .btn-primary {
            background: var(--lemon);
            color: var(--deep-black);
            font-weight: 700;
            padding: 0.9rem 2.4rem;
            border-radius: var(--radius-btn);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            transition: all var(--transition);
            cursor: pointer;
            border: none;
            box-shadow: 0 4px 15px rgba(233, 255, 91, 0.3);
            font-size: 1.1rem;
            letter-spacing: 0.5px;
            align-self: flex-start;
        }

        .btn-primary:hover {
            background: var(--lemon-hover);
            box-shadow: 0 0 28px rgba(233, 255, 91, 0.6);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        /* 板块通用 */
        section {
            padding: 7rem 0;
        }

        .section-title {
            font-size: 2.5rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 1rem;
        }

        .section-title::after {
            content: '';
            flex: 1;
            height: 2px;
            background: var(--lemon);
            opacity: 0.8;
        }

        .section-sub {
            color: var(--gray-text);
            font-size: 1.1rem;
            margin-bottom: 3.5rem;
        }

        /* 数据看板 */
        .data-panel {
            background: linear-gradient(135deg, #1A1A1A 0%, #2B2B2B 100%);
            color: white;
            padding: 5rem 0;
        }

        .metrics-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
        }

        .metric-item {
            text-align: left;
            background: transparent;
            border: none;
            padding: 1rem 0;
        }

        .metric-number {
            font-size: 3.8rem;
            font-weight: 800;
            color: var(--lemon);
            line-height: 1;
            font-feature-settings: "tnum";
            text-shadow: 0 0 10px rgba(233, 255, 91, 0.3);
        }

        .metric-divider {
            width: 40px;
            height: 3px;
            background: var(--lemon);
            margin: 0.8rem 0;
        }

        .metric-label {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.75);
            font-weight: 500;
        }

        /* 服务矩阵 */
        .services-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
        }

        .service-card {
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 2rem;
            box-shadow: var(--card-shadow);
            border-left: 4px solid var(--lemon);
            transition: all var(--transition);
            position: relative;
            display: flex;
            flex-direction: column;
        }

        .service-card:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-5px);
        }

        .service-icon {
            font-size: 2.8rem;
            color: var(--grass-green);
            margin-bottom: 1.5rem;
        }

        .service-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 0.8rem;
        }

        .service-card p {
            color: var(--gray-text);
            font-size: 0.95rem;
            line-height: 1.7;
            margin-bottom: 1.5rem;
            flex: 1;
        }

        .service-link {
            color: var(--grass-green);
            font-weight: 700;
            font-size: 0.95rem;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: var(--transition);
            cursor: pointer;
        }

        .service-link:hover {
            transform: translateX(4px);
        }

        /* 对比区 */
        .compare-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
            background: var(--white);
            border-radius: var(--radius-card);
            padding: 2.5rem;
            box-shadow: var(--card-shadow);
        }

        .compare-col {
            padding: 1.5rem;
        }

        .compare-before {
            background: #F0F0EB;
            border-radius: var(--radius-card);
            color: var(--gray-text);
        }

        .compare-after {
            background: var(--white);
            border: 2px solid var(--lemon);
            border-radius: var(--radius-card);
            position: relative;
        }

        .compare-label {
            font-size: 0.9rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 1rem;
        }

        .compare-value {
            font-size: 3.5rem;
            font-weight: 800;
            color: var(--deep-black);
        }

        .compare-after .compare-value {
            color: var(--lemon);
            text-shadow: 0 0 6px rgba(233, 255, 91, 0.3);
        }

        .compare-unit {
            font-size: 1rem;
            color: var(--gray-mid);
        }

        .compare-arrow {
            color: var(--grass-green);
            font-size: 2rem;
            margin-left: 0.5rem;
            vertical-align: middle;
        }

        .compare-divider {
            width: 2px;
            background: repeating-linear-gradient(to bottom, var(--gray-light) 0px, var(--gray-light) 6px, transparent 6px, transparent 12px);
            height: 100%;
            margin: 0 1rem;
        }

        /* 流程 */
        .steps-line {
            display: flex;
            align-items: flex-start;
            justify-content: space-between;
            position: relative;
        }

        .step-item {
            text-align: center;
            flex: 1;
            position: relative;
        }

        .step-circle {
            width: 56px;
            height: 56px;
            background: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--lemon);
            margin: 0 auto 1rem;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            border: 2px solid var(--lemon);
        }

        .step-connector {
            position: absolute;
            top: 28px;
            left: 50%;
            width: 100%;
            height: 2px;
            background: var(--gray-light);
            z-index: 0;
        }

        .step-item:last-child .step-connector {
            display: none;
        }

        /* FAQ */
        .faq-item {
            border-bottom: 1px solid var(--gray-light);
            padding: 1.5rem 0;
            cursor: pointer;
        }

        .faq-question {
            font-weight: 700;
            font-size: 1.15rem;
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .faq-dot {
            width: 8px;
            height: 8px;
            background: var(--lemon);
            border-radius: 50%;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            background: #F9F9F6;
            margin-top: 0.8rem;
            border-radius: 8px;
            padding: 0 1.5rem;
            color: var(--gray-text);
        }

        .faq-item.open .faq-answer {
            max-height: 180px;
            padding: 1.5rem;
        }

        .faq-icon {
            margin-left: auto;
            transition: transform var(--transition);
            font-size: 1.3rem;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        /* 表单 */
        .form-wrap {
            background: #F4F4F0;
            padding: 4rem 0;
        }

        .form-inner {
            max-width: 600px;
            margin: 0 auto;
            text-align: center;
        }

        .form-lead {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 2.5rem;
            color: var(--deep-black);
        }

        .input-group {
            margin-bottom: 1.8rem;
            text-align: left;
        }

        .input-field {
            width: 100%;
            padding: 1rem 0.75rem;
            background: var(--white);
            border: none;
            border-bottom: 2px solid #D1D5DB;
            border-radius: 4px 4px 0 0;
            font-size: 1rem;
            transition: var(--transition);
        }

        .input-field:focus {
            border-bottom: 2px solid var(--lemon);
            outline: none;
        }

        .btn-submit {
            background: var(--lemon);
            color: var(--deep-black);
            font-weight: 700;
            padding: 1rem 2rem;
            width: 100%;
            border: none;
            border-radius: var(--radius-btn);
            font-size: 1.15rem;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 4px 15px rgba(233, 255, 91, 0.25);
        }

        .btn-submit:hover {
            background: var(--lemon-hover);
            box-shadow: 0 0 24px rgba(233, 255, 91, 0.5);
        }

        /* 页脚 */
        .site-footer {
            background: var(--deep-black);
            color: rgba(255, 255, 255, 0.7);
            padding: 2rem 0;
            text-align: center;
            font-size: 0.9rem;
        }

        /* 响应式 */
        @media (max-width: 1024px) {
            .hero-title {
                font-size: 3.2rem;
            }

            .metrics-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .services-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .navbar {
                width: 100%;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                padding: 0 1.5rem;
            }

            .nav-links {
                display: none;
                flex-direction: column;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                width: 100%;
                background: white;
                padding: 2rem;
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
            }

            .nav-links.show {
                display: flex;
            }

            .burger {
                display: flex;
            }

            .hero-split {
                flex-direction: column;
            }

            .hero-visual {
                width: 100%;
                height: 40vh;
            }

            .hero-content {
                width: 100%;
                padding: 2rem 1.5rem;
                text-align: center;
            }

            .hero-title {
                font-size: 2.8rem;
            }

            .btn-primary {
                align-self: center;
            }

            .metrics-grid {
                grid-template-columns: 1fr 1fr;
            }

            .services-grid {
                grid-template-columns: 1fr;
            }

            .compare-wrapper {
                grid-template-columns: 1fr;
            }

            .steps-line {
                flex-direction: column;
                gap: 2rem;
            }

            .step-connector {
                display: none;
            }
        }

        @media (max-width: 520px) {
            .hero-data-badge .big-number {
                font-size: 3.5rem;
            }

            .metric-number {
                font-size: 2.8rem;
            }

            .section-title {
                font-size: 2rem;
            }

            .container {
                padding-left: 1rem;
                padding-right: 1rem;
            }
        }