/* roulang page: index */
:root {
            --primary: #0f3d2b;
            --primary-light: #1a5e3e;
            --accent: #f04a2a;
            --accent-dark: #c93a1e;
            --bg: #faf8f3;
            --bg-alt: #f0ede4;
            --text: #1e1e1e;
            --text-muted: #5c5c5c;
            --text-inverse: #faf8f3;
            --success: #2d8a56;
            --card: #ffffff;
            --card-border: #e8e3d6;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.10), 0 2px 6px rgba(0, 0, 0, 0.06);
            --shadow-nav: 0 2px 16px rgba(0, 0, 0, 0.08);
            --shadow-btn: 0 2px 8px rgba(240, 74, 42, 0.25);
            --shadow-btn-hover: 0 6px 18px rgba(240, 74, 42, 0.35);
            --radius-lg: 12px;
            --radius-md: 8px;
            --radius-full: 999px;
            --font-stack-zh: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
            --font-stack-num: system-ui, "Inter", -apple-system, sans-serif;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.25s ease;
            --transition-slow: 0.35s ease-out;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-stack-zh);
            color: var(--text);
            background-color: var(--bg);
            line-height: 1.75;
            -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-fast);
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        input {
            font-family: inherit;
        }

        .container-custom {
            max-width: 1200px;
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (min-width: 768px) {
            .container-custom {
                padding-left: 40px;
                padding-right: 40px;
            }
        }
        @media (min-width: 1200px) {
            .container-custom {
                padding-left: 0;
                padding-right: 0;
            }
        }

        .section-padding {
            padding-top: 80px;
            padding-bottom: 80px;
        }
        @media (min-width: 1025px) {
            .section-padding {
                padding-top: 110px;
                padding-bottom: 110px;
            }
        }
        @media (max-width: 640px) {
            .section-padding {
                padding-top: 60px;
                padding-bottom: 60px;
            }
        }

        /* ========== 导航 ========== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            transition: background-color var(--transition-smooth), box-shadow var(--transition-smooth), padding var(--transition-smooth);
            padding: 16px 0;
            background-color: transparent;
        }
        .site-nav.scrolled {
            background-color: #ffffff;
            box-shadow: var(--shadow-nav);
            padding: 10px 0;
        }
        .site-nav .nav-logo {
            font-weight: 700;
            font-size: 1.35rem;
            letter-spacing: 0.02em;
            color: #ffffff;
            transition: color var(--transition-smooth);
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .site-nav.scrolled .nav-logo {
            color: var(--primary);
        }
        .nav-logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background-color: var(--accent);
            flex-shrink: 0;
            transition: background-color var(--transition-smooth);
        }
        .site-nav .nav-link {
            color: rgba(255, 255, 255, 0.92);
            font-weight: 500;
            font-size: 0.95rem;
            position: relative;
            padding: 6px 2px;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .site-nav.scrolled .nav-link {
            color: var(--text);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent);
            transition: width var(--transition-fast);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--accent) !important;
        }
        .site-nav.scrolled .nav-link:hover,
        .site-nav.scrolled .nav-link.active {
            color: var(--accent) !important;
        }

        .nav-cta-btn {
            background-color: var(--accent);
            color: #ffffff;
            font-weight: 600;
            padding: 10px 22px;
            border-radius: var(--radius-full);
            font-size: 0.9rem;
            border: none;
            transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            white-space: nowrap;
            box-shadow: var(--shadow-btn);
        }
        .nav-cta-btn:hover {
            background-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn-hover);
        }

        /* 汉堡菜单 */
        .hamburger-btn {
            display: none;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
            z-index: 1100;
            position: relative;
            width: 36px;
            height: 30px;
        }
        .hamburger-btn span {
            display: block;
            width: 28px;
            height: 2.5px;
            background-color: #ffffff;
            border-radius: 2px;
            position: absolute;
            left: 4px;
            transition: all var(--transition-smooth);
        }
        .site-nav.scrolled .hamburger-btn span {
            background-color: var(--primary);
        }
        .hamburger-btn span:nth-child(1) {
            top: 6px;
        }
        .hamburger-btn span:nth-child(2) {
            top: 14px;
        }
        .hamburger-btn span:nth-child(3) {
            top: 22px;
        }
        .hamburger-btn.open span:nth-child(1) {
            top: 14px;
            transform: rotate(45deg);
            background-color: #ffffff !important;
        }
        .hamburger-btn.open span:nth-child(2) {
            opacity: 0;
        }
        .hamburger-btn.open span:nth-child(3) {
            top: 14px;
            transform: rotate(-45deg);
            background-color: #ffffff !important;
        }

        @media (max-width: 1024px) {
            .hamburger-btn {
                display: block;
            }
            .desktop-nav-links {
                display: none !important;
            }
            .site-nav .nav-logo {
                font-size: 1.2rem;
            }
        }
        @media (min-width: 1025px) {
            .hamburger-btn {
                display: none;
            }
            .desktop-nav-links {
                display: flex !important;
                align-items: center;
                gap: 28px;
            }
        }

        /* 移动端全屏菜单 */
        .mobile-menu-overlay {
            position: fixed;
            inset: 0;
            background-color: rgba(15, 61, 43, 0.95);
            z-index: 1050;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 28px;
            transform: translateX(100%);
            transition: transform var(--transition-smooth);
            pointer-events: none;
        }
        .mobile-menu-overlay.open {
            transform: translateX(0);
            pointer-events: auto;
        }
        .mobile-menu-overlay a {
            color: #ffffff;
            font-size: 1.3rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            transition: color var(--transition-fast);
        }
        .mobile-menu-overlay a:hover {
            color: var(--accent);
        }
        .mobile-menu-overlay .mobile-cta {
            margin-top: 8px;
            background-color: var(--accent);
            color: #fff;
            padding: 14px 36px;
            border-radius: var(--radius-full);
            font-weight: 600;
            font-size: 1.05rem;
            border: none;
            transition: background-color var(--transition-fast), transform var(--transition-fast);
        }
        .mobile-menu-overlay .mobile-cta:hover {
            background-color: var(--accent-dark);
            transform: translateY(-2px);
        }

        /* ========== Hero ========== */
        .hero-section {
            min-height: 90vh;
            display: flex;
            align-items: center;
            position: relative;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center 30%;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        @media (max-width: 640px) {
            .hero-section {
                min-height: 80vh;
            }
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 61, 43, 0.84) 0%, rgba(15, 61, 43, 0.48) 100%);
            z-index: 1;
        }
        .hero-decor-circle {
            position: absolute;
            border-radius: 50%;
            border: 2px solid rgba(240, 74, 42, 0.12);
            z-index: 0;
            pointer-events: none;
        }
        .hero-decor-circle.c1 {
            width: 380px;
            height: 380px;
            top: -120px;
            right: -100px;
        }
        .hero-decor-circle.c2 {
            width: 200px;
            height: 200px;
            bottom: 60px;
            left: -60px;
            border-color: rgba(240, 74, 42, 0.08);
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .hero-content h1 {
            font-size: clamp(1.75rem, 4.5vw, 3.5rem);
            font-weight: 800;
            color: #ffffff;
            line-height: 1.2;
            margin: 0 0 16px 0;
            letter-spacing: 0.01em;
        }
        .hero-content .hero-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.9);
            margin: 0 0 32px 0;
            font-weight: 400;
            line-height: 1.5;
        }
        @media (max-width: 640px) {
            .hero-content .hero-subtitle {
                font-size: 1rem;
            }
        }
        .hero-btns {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 40px;
        }
        .btn-primary {
            background-color: var(--accent);
            color: #ffffff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-size: 1.05rem;
            border: none;
            display: inline-block;
            transition: background-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
            box-shadow: var(--shadow-btn);
            text-align: center;
        }
        .btn-primary:hover {
            background-color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-btn-hover);
        }
        .btn-outline {
            background: transparent;
            color: #ffffff;
            font-weight: 600;
            padding: 14px 32px;
            border-radius: var(--radius-full);
            font-size: 1.05rem;
            border: 1.5px solid rgba(255, 255, 255, 0.7);
            display: inline-block;
            transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
            text-align: center;
        }
        .btn-outline:hover {
            background-color: rgba(255, 255, 255, 0.1);
            border-color: #ffffff;
            transform: translateY(-2px);
        }
        .hero-trust-row {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            align-items: center;
            color: rgba(255, 255, 255, 0.75);
            font-size: 0.85rem;
        }
        .hero-trust-row span {
            white-space: nowrap;
        }
        .hero-trust-divider {
            width: 1px;
            height: 18px;
            background-color: rgba(255, 255, 255, 0.3);
            flex-shrink: 0;
        }

        /* ========== 区块标题 ========== */
        .section-title {
            font-size: clamp(1.4rem, 2.5vw, 2rem);
            font-weight: 700;
            color: var(--primary);
            margin: 0 0 8px 0;
            letter-spacing: 0.01em;
        }
        .section-lead {
            font-size: 1rem;
            color: var(--text-muted);
            margin: 0 0 40px 0;
            line-height: 1.6;
            max-width: 600px;
        }
        @media (min-width: 768px) {
            .section-lead {
                margin-bottom: 52px;
            }
        }

        /* ========== 服务卡片 ========== */
        .service-card {
            background: var(--card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--card-border);
            padding: 24px;
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
            display: flex;
            flex-direction: column;
            height: 100%;
        }
        .service-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--primary-light);
        }
        .service-card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: var(--radius-md);
            margin-bottom: 16px;
            background-color: var(--bg-alt);
        }
        .service-card h3 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--primary);
            margin: 0 0 8px 0;
        }
        .service-card p {
            font-size: 0.93rem;
            color: var(--text-muted);
            margin: 0 0 16px 0;
            line-height: 1.6;
            flex-grow: 1;
        }
        .service-card .card-link {
            color: var(--accent);
            font-weight: 500;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition-fast);
            align-self: flex-start;
        }
        .service-card .card-link:hover {
            gap: 8px;
        }
        .card-link-arrow {
            display: inline-block;
            transition: transform var(--transition-fast);
        }
        .service-card:hover .card-link-arrow {
            transform: translateX(4px);
        }

        /* ========== 数据指标 ========== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        @media (max-width: 768px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        .stat-item .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--accent);
            font-family: var(--font-stack-num);
            font-variant-numeric: tabular-nums;
            line-height: 1.1;
            margin-bottom: 4px;
        }
        @media (max-width: 640px) {
            .stat-item .stat-number {
                font-size: 2.2rem;
            }
        }
        .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            font-weight: 400;
        }

        /* ========== 案例卡片 ========== */
        .case-card {
            background: var(--card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--card-border);
            transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .case-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
        }
        .case-card-img-wrap {
            overflow: hidden;
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            flex-shrink: 0;
        }
        .case-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .case-card:hover .case-card-img {
            transform: scale(1.03);
        }
        .case-card-body {
            padding: 18px 20px 20px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }
        .case-card-body h3 {
            font-size: 1.08rem;
            font-weight: 600;
            color: var(--text);
            margin: 0 0 8px 0;
        }
        .case-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
            margin-bottom: 8px;
        }
        .case-tag {
            font-size: 0.75rem;
            background-color: #e6f0e8;
            color: var(--primary);
            padding: 3px 10px;
            border-radius: 20px;
            font-weight: 500;
            white-space: nowrap;
        }
        .case-card-body .case-summary {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.5;
            flex-grow: 1;
        }

        /* ========== 解决方案交替布局 ========== */
        .solution-row {
            display: flex;
            align-items: center;
            gap: 40px;
            margin-bottom: 60px;
        }
        @media (min-width: 1025px) {
            .solution-row {
                gap: 60px;
            }
        }
        @media (max-width: 768px) {
            .solution-row {
                flex-direction: column;
                gap: 24px;
                margin-bottom: 40px;
            }
        }
        .solution-row:last-child {
            margin-bottom: 0;
        }
        .solution-row.reverse {
            flex-direction: row-reverse;
        }
        @media (max-width: 768px) {
            .solution-row.reverse {
                flex-direction: column;
            }
        }
        .solution-img-wrap {
            flex: 0 0 48%;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
        }
        @media (max-width: 768px) {
            .solution-img-wrap {
                flex: 0 0 auto;
                width: 100%;
            }
        }
        .solution-img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }
        .solution-text {
            flex: 1;
        }
        .solution-text h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--primary);
            margin: 0 0 12px 0;
        }
        .solution-text p {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin: 0 0 14px 0;
            line-height: 1.7;
        }
        .solution-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .solution-list li {
            font-size: 0.93rem;
            color: var(--text);
            padding-left: 20px;
            position: relative;
            margin-bottom: 6px;
            line-height: 1.6;
        }
        .solution-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10px;
            width: 7px;
            height: 7px;
            border-radius: 50%;
            background-color: var(--accent);
        }

        /* ========== FAQ ========== */
        .faq-list {
            max-width: 760px;
            margin: 0 auto;
        }
        .faq-item {
            border-bottom: 1px solid var(--card-border);
        }
        .faq-item summary {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 18px 0;
            cursor: pointer;
            list-style: none;
            font-weight: 600;
            font-size: 1.02rem;
            color: var(--text);
            gap: 12px;
            user-select: none;
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::marker {
            display: none;
        }
        .faq-icon {
            flex-shrink: 0;
            width: 22px;
            height: 22px;
            position: relative;
            transition: transform var(--transition-smooth);
            color: var(--accent);
            font-size: 1.3rem;
            line-height: 1;
            text-align: center;
            font-weight: 400;
        }
        .faq-item[open] .faq-icon {
            transform: rotate(45deg);
        }
        .faq-answer {
            padding: 0 0 18px 0;
            color: var(--text-muted);
            line-height: 1.7;
            font-size: 0.93rem;
            max-width: 680px;
            animation: faq-fade-in var(--transition-slow);
        }
        @keyframes faq-fade-in {
            from {
                opacity: 0;
                transform: translateY(-6px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .faq-item[open] .faq-answer {
            animation: faq-fade-in var(--transition-slow);
        }

        /* ========== CTA联系区 ========== */
        .cta-section {
            background-color: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.18;
            z-index: 0;
        }
        .cta-section .container-custom {
            position: relative;
            z-index: 1;
        }
        .cta-section .section-title {
            color: #ffffff;
        }
        .cta-section .section-lead {
            color: rgba(255, 255, 255, 0.85);
            margin-left: auto;
            margin-right: auto;
            text-align: center;
        }
        .cta-form-row {
            display: flex;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto 24px;
            flex-wrap: wrap;
        }
        @media (max-width: 640px) {
            .cta-form-row {
                flex-direction: column;
                gap: 10px;
            }
        }
        .cta-form-row input {
            flex: 1;
            min-width: 140px;
            padding: 13px 16px;
            border-radius: var(--radius-md);
            border: none;
            font-size: 0.95rem;
            background: #ffffff;
            color: var(--text);
            outline: none;
            transition: outline var(--transition-fast);
        }
        .cta-form-row input::placeholder {
            color: #aaa;
        }
        .cta-form-row input:focus {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        .cta-form-row .btn-primary {
            flex-shrink: 0;
            white-space: nowrap;
            border-radius: var(--radius-md);
            padding: 13px 28px;
            font-size: 0.95rem;
        }
        .cta-contact-info {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            color: rgba(255, 255, 255, 0.8);
            font-size: 0.88rem;
        }
        .cta-contact-info span {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background-color: #0c2e1f;
            color: var(--text-inverse);
            padding: 50px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.3fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        .footer-brand .footer-logo {
            font-weight: 700;
            font-size: 1.2rem;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            opacity: 0.7;
            margin: 0;
            line-height: 1.5;
        }
        .footer-links h4,
        .footer-contact h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin: 0 0 12px 0;
            opacity: 0.9;
        }
        .footer-links a {
            display: block;
            font-size: 0.88rem;
            opacity: 0.7;
            margin-bottom: 6px;
            transition: color var(--transition-fast), opacity var(--transition-fast);
            color: var(--text-inverse);
        }
        .footer-links a:hover {
            color: var(--accent);
            opacity: 1;
        }
        .footer-contact p {
            font-size: 0.86rem;
            opacity: 0.7;
            margin: 0 0 5px 0;
            line-height: 1.5;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 16px;
            text-align: center;
            font-size: 0.8rem;
            opacity: 0.5;
        }

        /* ========== 装饰与辅助 ========== */
        .bg-alt-section {
            background-color: var(--bg-alt);
        }
        .text-center {
            text-align: center;
        }
        @media (max-width: 640px) {
            .text-center-mobile {
                text-align: center;
            }
            .hero-content {
                text-align: center;
            }
            .hero-btns {
                justify-content: center;
            }
            .hero-trust-row {
                justify-content: center;
            }
        }
        @media (min-width: 641px) {
            .hero-content {
                text-align: left;
            }
            .hero-btns {
                justify-content: flex-start;
            }
            .hero-trust-row {
                justify-content: flex-start;
            }
        }

        /* focus-visible全局 */
        a:focus-visible,
        button:focus-visible,
        input:focus-visible,
        summary:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
        }

        /* 数字滚动动画相关 */
        .stat-number.counting {
            transition: none;
        }