/* roulang page: index */
:root {
            --primary: #1F3A34;
            --secondary: #A9845A;
            --bg-main: #F5F2EC;
            --bg-dark: #121410;
            --bg-card: #FFFFFF;
            --text-main: #2B2A27;
            --text-muted: #6C6A64;
            --border-color: rgba(31, 58, 52, 0.14);
            --radius-btn: 0px;
            --radius-tag: 2px;
            --shadow-nav: 0 8px 30px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            font-size: 1rem;
            line-height: 1.8;
            letter-spacing: 0.01em;
            color: var(--text-main);
            background: var(--bg-main);
            overflow-x: hidden;
        }

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

        a:hover {
            color: var(--secondary);
        }

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

        .container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }

        section {
            padding: 96px 0;
        }

        .bg-dark-section {
            background: var(--bg-dark);
            color: #fff;
        }

        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.8125rem;
            font-weight: 600;
            letter-spacing: 0.14em;
            color: var(--secondary);
            text-transform: uppercase;
            margin-bottom: 12px;
        }

        .section-label::before {
            content: '';
            display: inline-block;
            width: 28px;
            height: 1px;
            background: var(--secondary);
        }

        .section-title {
            font-size: 2.25rem;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: 0.02em;
            color: var(--text-main);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 1rem;
            line-height: 1.8;
            color: var(--text-muted);
            max-width: 360px;
        }

        .section-title-bar {
            width: 56px;
            height: 1px;
            background: var(--secondary);
            margin: 20px 0 0;
        }

        /* ========== Buttons ========== */
        .btn {
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            font-weight: 600;
            font-size: 0.9375rem;
            line-height: 1.4;
            transition: var(--transition);
            border: 1px solid transparent;
            letter-spacing: 0.02em;
        }

        .btn:focus {
            box-shadow: none;
            outline: 2px solid var(--secondary);
            outline-offset: 2px;
        }

        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--secondary);
            border-color: var(--secondary);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
        }

        .btn-primary:active {
            background: var(--primary);
            border-color: var(--primary);
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-outline-primary {
            background: transparent;
            border: 1px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline-primary:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
        }

        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, 0.7);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: #fff;
            border-color: #fff;
            color: var(--primary);
            transform: translateY(-1px);
        }

        .btn-lg {
            padding: 16px 40px;
            font-size: 1rem;
        }

        /* ========== Navbar ========== */
        .navbar {
            padding: 0;
            min-height: 76px;
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            transition: var(--transition);
            z-index: 1000;
        }

        .navbar.scrolled {
            background: rgba(245, 242, 236, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(31, 58, 52, 0.08);
            box-shadow: var(--shadow-nav);
        }

        .navbar-brand {
            font-size: 1.375rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            color: #ffffff;
            display: inline-flex;
            align-items: center;
            gap: 0.05em;
            line-height: 1;
            padding: 0;
            margin-right: 2rem;
        }

        .navbar-brand .brand-num {
            font-family: 'Courier New', 'Consolas', monospace;
            letter-spacing: 0.08em;
            font-weight: 700;
        }

        .navbar.scrolled .navbar-brand {
            color: var(--text-main);
        }

        .navbar-brand:hover {
            color: #fff;
        }

        .navbar.scrolled .navbar-brand:hover {
            color: var(--primary);
        }

        .navbar .nav-link {
            color: rgba(255, 255, 255, 0.85);
            font-size: 0.9375rem;
            font-weight: 500;
            padding: 0.75rem 0.9rem !important;
            transition: var(--transition);
            line-height: 1.2;
        }

        .navbar.scrolled .nav-link {
            color: rgba(43, 42, 39, 0.8);
        }

        .navbar .nav-link:hover,
        .navbar .nav-link.active {
            color: #fff;
        }

        .navbar.scrolled .nav-link:hover,
        .navbar.scrolled .nav-link.active {
            color: var(--primary);
        }

        .navbar .nav-link-category {
            border-left: 1px solid rgba(255, 255, 255, 0.2);
            padding-left: 1rem !important;
            margin-left: 0.25rem;
            font-size: 0.875rem;
        }

        .navbar.scrolled .nav-link-category {
            border-left-color: rgba(31, 58, 52, 0.15);
        }

        .navbar-toggler {
            border: none;
            padding: 0.5rem 0.6rem;
        }

        .navbar-toggler:focus {
            box-shadow: none;
            outline: none;
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.85)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar.scrolled .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(31,58,52,0.85)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ========== Hero ========== */
        .hero {
            position: relative;
            height: 90vh;
            min-height: 640px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            overflow: hidden;
        }

        .hero-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            z-index: 1;
        }

        .hero-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: linear-gradient(120deg, rgba(0, 0, 0, 0.55) 0%, rgba(0, 0, 0, 0.35) 50%, rgba(0, 0, 0, 0.15) 100%);
            z-index: 2;
        }

        .hero-content {
            position: relative;
            z-index: 3;
            padding-top: 80px;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8125rem;
            font-weight: 600;
            letter-spacing: 0.2em;
            color: rgba(255, 255, 255, 0.7);
            text-transform: uppercase;
            margin-bottom: 24px;
        }

        .hero-tag .tag-line {
            display: inline-block;
            width: 32px;
            height: 1px;
            background: var(--secondary);
        }

        .hero-title {
            font-size: clamp(2.2rem, 5vw, 4rem);
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: 0.02em;
            color: #fff;
            margin-bottom: 24px;
            max-width: 680px;
        }

        .hero-subtitle {
            font-size: 1.0625rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.85);
            max-width: 480px;
            margin-bottom: 36px;
        }

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

        .hero-scroll {
            position: absolute;
            bottom: 36px;
            left: 50%;
            transform: translateX(-50%);
            z-index: 3;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .hero-scroll .scroll-line {
            display: block;
            width: 1px;
            height: 48px;
            background: linear-gradient(to bottom, var(--secondary) 0%, transparent 100%);
            animation: scrollPulse 2s ease-in-out infinite;
        }

        @keyframes scrollPulse {
            0%,
            100% {
                opacity: 1;
                transform: scaleY(1);
            }
            50% {
                opacity: 0.5;
                transform: scaleY(0.7);
            }
        }

        /* ========== Services ========== */
        .section-services {
            background: var(--bg-main);
        }

        .service-list {
            border-top: 1px solid var(--border-color);
        }

        .service-item {
            display: flex;
            align-items: center;
            gap: 40px;
            padding: 32px 0;
            border-bottom: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .service-item:hover {
            padding-left: 12px;
        }

        .service-item:hover .service-num {
            color: var(--secondary);
        }

        .service-num {
            font-size: 1.25rem;
            font-weight: 700;
            color: rgba(31, 58, 52, 0.3);
            min-width: 56px;
            transition: var(--transition);
            font-family: 'Courier New', monospace;
            letter-spacing: 0.04em;
        }

        .service-content {
            flex: 1;
        }

        .service-content h3 {
            font-size: 1.375rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--text-main);
        }

        .service-content p {
            font-size: 0.9375rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.7;
            max-width: 560px;
        }

        .service-link {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border: 1px solid var(--border-color);
            border-radius: 50%;
            color: var(--primary);
            font-size: 0.875rem;
            flex-shrink: 0;
            transition: var(--transition);
        }

        .service-link:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        /* ========== Data ========== */
        .section-data {
            background: var(--bg-dark);
            color: #fff;
        }

        .section-data .section-title {
            color: #fff;
        }

        .section-data .section-desc {
            color: rgba(255, 255, 255, 0.6);
        }

        .data-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 48px 32px;
        }

        .data-item {
            padding: 24px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .data-number {
            display: block;
            font-size: 3.5rem;
            font-weight: 700;
            line-height: 1.1;
            color: var(--secondary);
            font-family: 'Courier New', monospace;
            letter-spacing: 0.02em;
            margin-bottom: 8px;
        }

        .data-label {
            font-size: 0.9375rem;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.5;
        }

        /* ========== Cases ========== */
        .section-cases {
            background: var(--bg-main);
        }

        .case-row {
            margin-bottom: 80px;
        }

        .case-row:last-child {
            margin-bottom: 0;
        }

        .case-image {
            overflow: hidden;
            background: #fff;
            aspect-ratio: 4 / 3;
            position: relative;
        }

        .case-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .case-image:hover img {
            transform: scale(1.03);
        }

        .case-content {
            padding: 20px 0;
        }

        .case-tag {
            display: inline-block;
            background: rgba(169, 132, 90, 0.12);
            color: var(--primary);
            font-size: 0.8125rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: var(--radius-tag);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        .case-content h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 12px;
            line-height: 1.4;
        }

        .case-content p {
            color: var(--text-muted);
            font-size: 0.9375rem;
            line-height: 1.7;
            margin-bottom: 24px;
            max-width: 480px;
        }

        /* ========== Solution ========== */
        .section-solution {
            background: var(--bg-main);
            border-top: 1px solid var(--border-color);
        }

        .solution-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .solution-item {
            padding: 28px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .solution-item:hover {
            border-color: rgba(31, 58, 52, 0.3);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }

        .solution-item h4 {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .solution-item h4::before {
            content: '';
            display: inline-block;
            width: 8px;
            height: 8px;
            background: var(--secondary);
            border-radius: 1px;
        }

        .solution-item p {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin: 0;
        }

        .solution-cta {
            margin-top: 40px;
        }

        /* ========== News Cards ========== */
        .section-news {
            background: var(--bg-main);
        }

        .post-card {
            display: block;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            height: 100%;
            transition: var(--transition);
        }

        .post-card:hover {
            border-color: rgba(31, 58, 52, 0.28);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
        }

        .post-cover {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            background: #f0ede8;
        }

        .post-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }

        .post-card:hover .post-cover img {
            transform: scale(1.03);
        }

        .post-body {
            padding: 24px;
        }

        .post-cat {
            display: inline-block;
            background: rgba(169, 132, 90, 0.12);
            color: var(--primary);
            font-size: 0.75rem;
            font-weight: 600;
            padding: 3px 10px;
            border-radius: var(--radius-tag);
            margin-bottom: 12px;
            letter-spacing: 0.04em;
        }

        .post-title {
            font-size: 1.125rem;
            font-weight: 600;
            line-height: 1.45;
            color: var(--text-main);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: var(--transition);
        }

        .post-card:hover .post-title {
            color: var(--primary);
        }

        .post-excerpt {
            font-size: 0.875rem;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 16px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .post-date {
            font-size: 0.8125rem;
            color: var(--text-muted);
            display: block;
        }

        .empty-state {
            grid-column: 1 / -1;
            border: 2px dashed rgba(31, 58, 52, 0.2);
            padding: 64px 24px;
            text-align: center;
            background: rgba(255, 255, 255, 0.4);
        }

        .empty-state i {
            font-size: 2.5rem;
            color: rgba(31, 58, 52, 0.3);
            margin-bottom: 16px;
        }

        .empty-state p {
            font-size: 1rem;
            color: var(--text-muted);
            margin: 0;
        }

        .news-more {
            margin-top: 48px;
            text-align: center;
        }

        /* ========== FAQ ========== */
        .section-faq {
            background: var(--bg-main);
            border-top: 1px solid var(--border-color);
        }

        .accordion {
            --bs-accordion-bg: transparent;
            --bs-accordion-border-width: 0;
            --bs-accordion-btn-bg: transparent;
            --bs-accordion-active-bg: transparent;
            --bs-accordion-btn-focus-box-shadow: none;
        }

        .accordion-item {
            background: transparent;
            border: none;
            border-bottom: 1px solid var(--border-color);
            border-radius: 0 !important;
        }

        .accordion-button {
            background: transparent !important;
            padding: 22px 48px 22px 0;
            font-size: 1.0625rem;
            font-weight: 600;
            color: var(--text-main);
            box-shadow: none !important;
            transition: var(--transition);
            line-height: 1.4;
        }

        .accordion-button:not(.collapsed) {
            color: var(--primary);
        }

        .accordion-button::after {
            content: '+';
            background: none;
            width: 24px;
            height: 24px;
            display: flex;
            align-items: center;
            justify-content: center;
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 1.375rem;
            font-weight: 300;
            color: var(--primary);
            transition: transform 0.3s ease;
        }

        .accordion-button:not(.collapsed)::after {
            content: '−';
            background: none;
            transform: translateY(-50%);
        }

        .accordion-body {
            padding: 0 48px 24px 0;
            color: var(--text-muted);
            font-size: 0.9375rem;
            line-height: 1.7;
        }

        .faq-contact {
            margin-top: 32px;
            padding: 24px;
            border-left: 3px solid var(--secondary);
            background: rgba(169, 132, 90, 0.06);
        }

        .faq-contact p {
            font-size: 0.9375rem;
            color: var(--text-muted);
            margin-bottom: 12px;
        }

        .faq-contact .btn {
            padding: 10px 24px;
            font-size: 0.875rem;
        }

        /* ========== Contact ========== */
        .section-contact {
            background: var(--bg-main);
            border-top: 1px solid var(--border-color);
        }

        .contact-info-item {
            display: flex;
            gap: 16px;
            margin-bottom: 28px;
        }

        .contact-info-icon {
            width: 44px;
            height: 44px;
            border: 1px solid var(--border-color);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-size: 1rem;
            background: var(--bg-card);
            flex-shrink: 0;
        }

        .contact-info-item h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 4px;
        }

        .contact-info-item p {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.6;
        }

        .contact-form-wrap {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            padding: 40px;
        }

        .form-label {
            font-size: 0.875rem;
            font-weight: 500;
            color: var(--text-muted);
            margin-bottom: 6px;
        }

        .form-control {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-btn);
            padding: 12px 16px;
            font-size: 0.9375rem;
            color: var(--text-main);
            transition: var(--transition);
            line-height: 1.5;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(31, 58, 52, 0.08);
            color: var(--text-main);
            background: #fff;
        }

        .form-control::placeholder {
            color: #b5b0a8;
            font-size: 0.875rem;
        }

        textarea.form-control {
            resize: vertical;
            min-height: 120px;
        }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.6);
            padding: 80px 0 32px;
            font-size: 0.875rem;
            line-height: 1.7;
        }

        .site-footer h5 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: 0.03em;
        }

        .footer-brand {
            font-size: 1.375rem;
            font-weight: 600;
            color: #fff;
            letter-spacing: 0.02em;
            display: inline-flex;
            align-items: center;
            gap: 0.05em;
            margin-bottom: 12px;
            line-height: 1.2;
        }

        .footer-brand .brand-num {
            font-family: 'Courier New', monospace;
            letter-spacing: 0.08em;
            font-weight: 700;
        }

        .footer-desc {
            margin-bottom: 24px;
            max-width: 280px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.55);
            transition: var(--transition);
        }

        .footer-links a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }

        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 12px;
            color: rgba(255, 255, 255, 0.55);
        }

        .footer-contact-item i {
            margin-top: 4px;
            font-size: 0.875rem;
            color: var(--secondary);
            width: 16px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            margin-top: 56px;
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer-bottom p {
            margin: 0;
            font-size: 0.8125rem;
            color: rgba(255, 255, 255, 0.35);
        }

        /* ========== Back to Top ========== */
        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 44px;
            height: 44px;
            background: var(--primary);
            border: none;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 0.875rem;
            z-index: 999;
            transition: var(--transition);
            opacity: 0;
            visibility: hidden;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
        }

        .back-to-top.show {
            opacity: 1;
            visibility: visible;
        }

        .back-to-top:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }

        /* ========== Responsive ========== */
        @media (max-width: 991.98px) {
            section {
                padding: 80px 0;
            }

            .navbar-collapse {
                background: var(--primary);
                padding: 20px;
                margin-top: 10px;
                border-radius: 0;
                max-height: calc(100vh - 100px);
                overflow-y: auto;
            }

            .navbar-collapse .nav-link {
                color: #fff !important;
                padding: 12px 0 !important;
                font-size: 1rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            }

            .navbar-collapse .nav-link-category {
                border-left: none;
                padding-left: 0 !important;
                margin-left: 0;
            }

            .navbar-collapse .nav-link-category::before {
                content: '· ';
                color: var(--secondary);
            }

            .navbar-toggler {
                color: #fff;
            }

            .navbar.scrolled .navbar-toggler {
                color: var(--primary);
            }

            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px 16px;
            }

            .data-number {
                font-size: 2.75rem;
            }

            .case-row {
                margin-bottom: 56px;
            }

            .case-content {
                padding: 24px 0 0;
            }

            .solution-grid {
                gap: 20px;
            }

            .contact-form-wrap {
                margin-top: 32px;
                padding: 28px;
            }
        }

        @media (max-width: 767.98px) {
            section {
                padding: 64px 0;
            }

            .hero {
                height: 80vh;
                min-height: 560px;
            }

            .hero-title {
                font-size: clamp(1.9rem, 6vw, 2.6rem);
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .section-title {
                font-size: 1.75rem;
            }

            .service-item {
                gap: 20px;
                padding: 24px 0;
            }

            .service-num {
                min-width: 40px;
                font-size: 1rem;
            }

            .service-content h3 {
                font-size: 1.125rem;
            }

            .service-link {
                width: 36px;
                height: 36px;
            }

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

            .data-number {
                font-size: 2.25rem;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 575.98px) {
            .container {
                padding-left: 20px;
                padding-right: 20px;
            }

            .hero {
                min-height: 520px;
            }

            .hero-actions {
                flex-direction: column;
                gap: 12px;
            }

            .hero-actions .btn {
                width: 100%;
                text-align: center;
            }

            .data-grid {
                grid-template-columns: 1fr;
                gap: 12px;
            }

            .data-item {
                padding: 16px 0;
            }

            .data-number {
                font-size: 2.5rem;
            }

            .service-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }

            .service-link {
                display: none;
            }

            .case-image {
                aspect-ratio: 16 / 12;
            }

            .back-to-top {
                bottom: 20px;
                right: 20px;
            }

            .contact-form-wrap {
                padding: 20px;
            }

            .faq-contact {
                padding: 18px;
            }
        }

        /* Bootstrap overrides */
        .accordion-button:not(.collapsed)::before {
            background: none;
        }

        .dropdown-menu {
            border-radius: 0;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-nav);
            padding: 8px 0;
        }

        .dropdown-item {
            padding: 10px 20px;
            font-size: 0.875rem;
            color: var(--text-main);
            transition: var(--transition);
        }

        .dropdown-item:hover {
            background: var(--bg-main);
            color: var(--primary);
        }

/* roulang page: category1 */
:root {
            --primary: #1F3A34;
            --primary-dark: #162A25;
            --accent: #A9845A;
            --accent-light: rgba(169, 132, 90, 0.12);
            --bg-warm: #F5F2EC;
            --bg-dark: #121410;
            --card-bg: #FFFFFF;
            --text-main: #2B2A27;
            --text-muted: #6C6A64;
            --border-color: rgba(31, 58, 52, 0.14);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --radius: 0;
            --radius-sm: 2px;
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --transition: 200ms ease-out;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background-color: var(--bg-warm);
            color: var(--text-main);
            line-height: 1.8;
            letter-spacing: 0.01em;
            overflow-x: hidden;
        }

        .container {
            max-width: 1200px;
        }

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

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

        a:hover {
            color: var(--primary);
        }

        button,
        input,
        textarea {
            font-family: inherit;
        }

        button:focus-visible,
        input:focus-visible,
        textarea:focus-visible,
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }

        /* ======= 导航 ======= */
        .navbar {
            padding: 0;
            min-height: 76px;
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.12);
            transition: background 300ms ease, box-shadow 300ms ease, min-height 300ms ease;
        }

        .navbar.scrolled {
            background: rgba(245, 242, 236, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(31, 58, 52, 0.08);
            box-shadow: var(--shadow-md);
            min-height: 76px;
        }

        .navbar.scrolled .navbar-brand,
        .navbar.scrolled .nav-link {
            color: var(--text-main);
        }

        .navbar-brand {
            display: inline-flex;
            align-items: center;
            font-weight: 600;
            font-size: 1.25rem;
            letter-spacing: 0.02em;
            color: #fff;
            padding: 0;
            margin-right: 2rem;
            white-space: nowrap;
        }

        .brand-num {
            font-family: 'SF Mono', 'Consolas', 'Menlo', monospace;
            letter-spacing: 0.08em;
            font-size: 1.05em;
            margin-right: 0.1rem;
        }

        .navbar-nav {
            gap: 0.25rem;
        }

        .nav-item {
            margin: 0 0.125rem;
        }

        .nav-link {
            font-weight: 400;
            font-size: 0.9375rem;
            color: rgba(255, 255, 255, 0.9);
            padding: 0.5rem 1rem !important;
            border-radius: var(--radius);
            transition: color 200ms ease, background-color 200ms ease, opacity 200ms ease;
            position: relative;
        }

        .nav-link:hover {
            color: #fff;
            opacity: 0.8;
        }

        .navbar.scrolled .nav-link:hover {
            color: var(--primary);
            opacity: 1;
        }

        .nav-link.active {
            font-weight: 600;
            color: var(--accent) !important;
        }

        .navbar.scrolled .nav-link.active {
            color: var(--primary) !important;
        }

        .navbar-toggler {
            border: 1px solid rgba(255, 255, 255, 0.4);
            border-radius: 0;
            padding: 0.375rem 0.75rem;
            background: transparent;
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.85)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        .navbar.scrolled .navbar-toggler {
            border-color: var(--primary);
        }

        .navbar.scrolled .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%231F3A34' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        @media (max-width: 991.98px) {
            .navbar {
                min-height: 62px;
            }

            .navbar.scrolled {
                min-height: 62px;
            }

            .navbar-collapse {
                background: rgba(18, 20, 16, 0.97);
                backdrop-filter: blur(20px);
                border-bottom: 1px solid rgba(169, 132, 90, 0.3);
                padding: 1.25rem;
                position: absolute;
                top: 100%;
                left: 0;
                width: 100%;
            }

            .navbar.scrolled .navbar-collapse {
                background: rgba(245, 242, 236, 0.98);
                border-bottom: 1px solid var(--border-color);
            }

            .nav-link {
                font-size: 1.05rem;
                padding: 0.8rem 0 !important;
                color: rgba(255, 255, 255, 0.9);
                border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            }

            .navbar.scrolled .nav-link {
                color: var(--text-main);
                border-bottom: 1px solid var(--border-color);
            }

            .nav-link.active {
                color: var(--accent) !important;
            }
        }

        /* ======= Hero 矮版 ======= */
        .category-hero {
            min-height: 420px;
            display: flex;
            align-items: center;
            margin-top: 76px;
            background: linear-gradient(135deg, rgba(18, 20, 16, 0.88), rgba(31, 58, 52, 0.72)), url('/assets/images/backpic/back-2.webp') center / cover;
            color: #f5f2ec;
            padding: 70px 0 80px;
        }

        .category-hero .breadcrumb {
            background: transparent;
            padding: 0;
            margin-bottom: 1rem;
            font-size: 0.875rem;
            --bs-breadcrumb-divider-color: rgba(255, 255, 255, 0.5);
        }

        .category-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
            transition: color 200ms;
        }

        .category-hero .breadcrumb a:hover {
            color: var(--accent);
        }

        .category-hero .breadcrumb-item.active {
            color: rgba(255, 255, 255, 0.92);
        }

        .category-hero .breadcrumb-item+.breadcrumb-item::before {
            color: rgba(255, 255, 255, 0.5);
        }

        .category-hero h1 {
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: 0.02em;
            margin-bottom: 1rem;
            color: #fff;
        }

        .category-hero h1 .accent-text {
            color: var(--accent);
        }

        .category-hero .hero-lead {
            font-size: 1.125rem;
            line-height: 1.8;
            max-width: 680px;
            color: rgba(245, 242, 236, 0.85);
            margin-bottom: 2rem;
        }

        .hero-tag {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            font-size: 0.8125rem;
            letter-spacing: 0.15em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 1.25rem;
        }

        .hero-tag::before {
            content: '';
            width: 36px;
            height: 1px;
            background: var(--accent);
            display: inline-block;
        }

        .category-hero .btn-outline-light {
            border-radius: var(--radius);
        }

        /* ======= 面包屑 ======= */
        .page-breadcrumb {
            padding: 16px 0;
            font-size: 0.875rem;
            background: transparent;
        }

        .page-breadcrumb a {
            color: var(--text-muted);
        }

        .page-breadcrumb a:hover {
            color: var(--primary);
        }

        .page-breadcrumb .breadcrumb-item.active {
            color: var(--text-main);
        }

        /* ======= 通用区块标题 ======= */
        .section-block {
            padding: 96px 0;
        }

        .section-heading {
            margin-bottom: 3rem;
        }

        .section-heading .tag-label {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.8125rem;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--accent);
            margin-bottom: 0.75rem;
        }

        .section-heading .tag-label::before {
            content: '';
            width: 32px;
            height: 1px;
            background: var(--accent);
        }

        .section-heading h2 {
            font-size: clamp(1.875rem, 3vw, 2.375rem);
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-main);
            margin-bottom: 0.75rem;
        }

        .section-heading .line-bar {
            width: 64px;
            height: 2px;
            background: var(--accent);
            margin-bottom: 1rem;
        }

        .section-heading .heading-desc {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 520px;
            line-height: 1.8;
        }

        .section-dark {
            background: var(--bg-dark);
            color: #e8e6e1;
        }

        .section-dark .section-heading h2 {
            color: #f5f2ec;
        }

        .section-dark .section-heading .heading-desc {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ======= 概述区 ======= */
        .category-about {
            background: var(--bg-warm);
        }

        .about-inner {
            display: grid;
            grid-template-columns: 1fr 1.2fr;
            gap: 64px;
            align-items: start;
        }

        .about-media {
            position: relative;
            overflow: hidden;
            background: var(--primary);
            min-height: 360px;
        }

        .about-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: scale 0.4s ease-out;
        }

        .about-media:hover img {
            scale: 1.03;
        }

        .about-text h3 {
            font-size: 1.375rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 1rem;
        }

        .about-text p {
            color: var(--text-muted);
            font-size: 1rem;
            line-height: 1.8;
            margin-bottom: 1rem;
        }

        .about-list {
            margin-top: 1.5rem;
        }

        .about-list-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 0.875rem 0;
            border-bottom: 1px solid var(--border-color);
        }

        .about-list-item i {
            color: var(--accent);
            font-size: 1rem;
            width: 20px;
            text-align: center;
            margin-top: 6px;
        }

        .about-list-item p {
            margin-bottom: 0;
            font-size: 0.9375rem;
            color: var(--text-main);
        }

        @media (max-width: 991.98px) {
            .about-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .about-media {
                min-height: 260px;
            }
        }

        /* ======= 特色模块一：服务清单 ======= */
        .feature-module {
            padding: 96px 0;
        }

        .feature-list {
            border-top: 1px solid var(--primary);
        }

        .feature-item {
            display: grid;
            grid-template-columns: 72px 1fr 1.4fr;
            gap: 24px;
            padding: 32px 0;
            border-bottom: 1px solid rgba(31, 58, 52, 0.14);
            transition: background 0.3s ease;
        }

        .feature-item .num {
            font-size: 1.375rem;
            font-weight: 700;
            color: var(--accent);
            line-height: 1.4;
        }

        .feature-item .feature-title {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--text-main);
            margin-bottom: 0.25rem;
        }

        .feature-item .feature-sub {
            font-size: 0.875rem;
            color: var(--accent);
            margin-bottom: 0.75rem;
        }

        .feature-item .feature-desc {
            color: var(--text-muted);
            font-size: 0.9375rem;
            line-height: 1.8;
        }

        @media (max-width: 767.98px) {
            .feature-item {
                grid-template-columns: 1fr;
                gap: 12px;
                padding: 24px 0;
            }

            .feature-item .num {
                margin-bottom: 4px;
            }
        }

        /* ======= 双栏内页模块 ======= */
        .split-module {
            background: var(--bg-warm);
            padding: 96px 0;
        }

        .split-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 64px;
            align-items: center;
            margin-bottom: 96px;
        }

        .split-row:last-child {
            margin-bottom: 0;
        }

        .split-row.reverse .split-media {
            order: 2;
        }

        .split-media {
            overflow: hidden;
            background: var(--primary);
            min-height: 320px;
        }

        .split-media img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: scale 0.4s ease-out;
        }

        .split-media:hover img {
            scale: 1.03;
        }

        .split-content h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-main);
            margin-bottom: 1rem;
            line-height: 1.4;
        }

        .split-content p {
            color: var(--text-muted);
            margin-bottom: 1rem;
            font-size: 1rem;
        }

        .split-list {
            margin-top: 1.5rem;
        }

        .split-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 0.6rem 0;
            color: var(--text-main);
            font-size: 0.9375rem;
            border-bottom: 1px dashed rgba(31, 58, 52, 0.1);
        }

        .split-list li i {
            color: var(--accent);
            margin-top: 5px;
            font-size: 0.875rem;
        }

        @media (max-width: 991.98px) {
            .split-row,
            .split-row.reverse {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .split-row.reverse .split-media {
                order: 1;
            }

            .split-row.reverse .split-content {
                order: 2;
            }

            .split-media {
                min-height: 240px;
            }
        }

        /* ======= 引用块 ======= */
        .highlight-quote {
            background: var(--primary);
            padding: 80px 0;
            color: #fff;
        }

        .highlight-quote .quote-inner {
            max-width: 960px;
            margin: 0 auto;
            text-align: left;
        }

        .highlight-quote .quote-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 1.5rem;
        }

        .highlight-quote blockquote {
            font-size: clamp(1.25rem, 2vw, 1.75rem);
            line-height: 1.6;
            font-weight: 600;
            margin-bottom: 1.5rem;
            letter-spacing: 0.01em;
        }

        .highlight-quote .quote-author {
            color: var(--accent);
            font-size: 0.9375rem;
            letter-spacing: 0.08em;
        }

        /* ======= 流程模块 ======= */
        .process-module {
            padding: 96px 0;
            background: var(--bg-warm);
        }

        .process-step {
            display: grid;
            grid-template-columns: 60px 1fr;
            gap: 20px;
            padding: 32px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .process-step:last-child {
            border-bottom: none;
        }

        .process-step .step-num {
            font-size: 2.25rem;
            font-weight: 700;
            color: transparent;
            -webkit-text-stroke: 1px var(--accent);
            line-height: 1;
        }

        .process-step h4 {
            font-size: 1.125rem;
            font-weight: 600;
            margin-bottom: 0.5rem;
            color: var(--text-main);
        }

        .process-step p {
            color: var(--text-muted);
            font-size: 0.9375rem;
            line-height: 1.7;
            max-width: 640px;
            margin-bottom: 0;
        }

        /* ======= CTA 块 ======= */
        .cta-section {
            background: var(--primary);
            padding: 80px 0;
            color: #fff;
        }

        .cta-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 32px;
        }

        .cta-text h2 {
            font-size: clamp(1.875rem, 3vw, 2.5rem);
            font-weight: 700;
            margin-bottom: 0.75rem;
        }

        .cta-text p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.0625rem;
            max-width: 560px;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .btn {
            border-radius: var(--radius);
            padding: 14px 32px;
            font-weight: 600;
            font-size: 1rem;
            line-height: 1.4;
            transition: all 260ms ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .btn-primary {
            background-color: var(--primary);
            border: 1px solid var(--primary);
            color: #fff;
        }

        .btn-primary:hover {
            background-color: var(--accent);
            border-color: var(--accent);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
        }

        .btn-outline-primary {
            background: transparent;
            border: 1px solid var(--primary);
            color: var(--primary);
        }

        .btn-outline-primary:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: var(--shadow-sm);
        }

        .btn-light {
            background: #fff;
            border: 1px solid #fff;
            color: var(--primary);
        }

        .btn-light:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: #fff;
        }

        .btn-outline-light {
            border: 1px solid rgba(255, 255, 255, 0.8);
            color: #fff;
        }

        .btn-outline-light:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: #fff;
            color: #fff;
        }

        .btn-accent {
            background: var(--accent);
            border: 1px solid var(--accent);
            color: #fff;
        }

        .btn-accent:hover {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        @media (max-width: 767.98px) {
            .cta-inner {
                flex-direction: column;
                text-align: left;
            }

            .section-block,
            .feature-module,
            .split-module,
            .process-module {
                padding: 64px 0;
            }
        }

        /* ======= FAQ ======= */
        .faq-module {
            background: var(--bg-warm);
            padding: 96px 0;
        }

        .faq-layout {
            display: grid;
            grid-template-columns: 1fr 1.4fr;
            gap: 56px;
        }

        .faq-left {
            position: sticky;
            top: 120px;
            align-self: start;
        }

        .faq-left h2 {
            font-size: clamp(1.875rem, 2.5vw, 2.375rem);
            font-weight: 700;
            line-height: 1.3;
            margin-bottom: 1rem;
            color: var(--text-main);
        }

        .faq-left .line-bar {
            width: 64px;
            height: 2px;
            background: var(--accent);
            margin-bottom: 1rem;
        }

        .faq-left p {
            color: var(--text-muted);
            font-size: 1rem;
            margin-bottom: 1.5rem;
        }

        .faq-list .accordion-item {
            background: transparent;
            border: none;
            border-bottom: 1px solid var(--border-color);
            border-radius: 0;
        }

        .faq-list .accordion-button {
            background: transparent;
            padding: 1.25rem 0.5rem;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-main);
            border-radius: 0;
            box-shadow: none;
            transition: color 200ms ease;
        }

        .faq-list .accordion-button:not(.collapsed) {
            background: transparent;
            color: var(--primary);
            box-shadow: none;
        }

        .faq-list .accordion-button:focus {
            box-shadow: none;
            outline: 2px solid rgba(31, 58, 52, 0.12);
        }

        .faq-list .accordion-button::after {
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            content: "\f078";
            background: none;
            width: 1rem;
            height: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.875rem;
            color: var(--primary);
            transition: transform 300ms ease;
        }

        .faq-list .accordion-button:not(.collapsed)::after {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-list .accordion-body {
            padding: 0 0.5rem 1.25rem;
            color: var(--text-muted);
            font-size: 0.9375rem;
            line-height: 1.7;
        }

        @media (max-width: 991.98px) {
            .faq-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }

            .faq-left {
                position: static;
            }
        }

        /* ======= 页脚 ======= */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 72px 0 0;
        }

        .footer-brand {
            font-size: 1.375rem;
            font-weight: 600;
            color: #fff;
            letter-spacing: 0.02em;
            display: inline-block;
            margin-bottom: 1rem;
        }

        .footer-brand .brand-num {
            font-size: 1.05em;
            letter-spacing: 0.08em;
        }

        .footer-brand:hover {
            color: var(--accent);
        }

        .footer-desc {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9375rem;
            line-height: 1.7;
            max-width: 320px;
        }

        .site-footer h5 {
            font-size: 1rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 1.25rem;
            letter-spacing: 0.05em;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .footer-links li {
            margin-bottom: 0.75rem;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9375rem;
            transition: color 200ms, padding-left 200ms;
        }

        .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 0.875rem;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9375rem;
        }

        .footer-contact-item i {
            color: var(--accent);
            width: 16px;
            text-align: center;
            margin-top: 4px;
            font-size: 0.875rem;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 24px 0;
            margin-top: 48px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 12px;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.8125rem;
        }

        .footer-bottom p {
            margin: 0;
        }

        @media (max-width: 991.98px) {
            .site-footer {
                padding-top: 56px;
            }
        }

        /* ======= 滚动出现动画 ======= */
        .fade-up {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 600ms ease-out, transform 600ms ease-out;
        }

        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

        /* ======= 顶部返回 ======= */
        .back-top {
            position: fixed;
            right: 24px;
            bottom: 24px;
            width: 44px;
            height: 44px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: 0;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            z-index: 99;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
            transition: background 200ms ease, transform 200ms ease;
        }

        .back-top:hover {
            background: var(--accent);
            color: #fff;
        }

        @media (max-width: 576px) {
            .back-top {
                right: 14px;
                bottom: 14px;
                width: 38px;
                height: 38px;
                font-size: 0.875rem;
            }
        }

        /* Bootstrap 覆盖 */
        .form-control {
            border-radius: var(--radius);
            border: 1px solid var(--border-color);
            padding: 12px 16px;
            background: #fff;
            font-size: 1rem;
            color: var(--text-main);
            transition: border-color 200ms ease, box-shadow 200ms ease;
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(31, 58, 52, 0.08);
            outline: none;
        }

        .form-label {
            font-size: 0.875rem;
            color: var(--text-muted);
            margin-bottom: 6px;
            font-weight: 500;
        }

/* roulang page: category2 */
:root{
  --primary:#1F3A34;
  --accent:#A9845A;
  --bg:#F5F2EC;
  --dark:#121410;
  --card:#FFFFFF;
  --text:#2B2A27;
  --text-light:#6C6A64;
  --border:rgba(31,58,52,0.14);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.08);
  --shadow-md:0 8px 30px rgba(0,0,0,0.08);
  --shadow-lg:0 10px 40px rgba(0,0,0,0.12);
  --radius:0px;
  --radius-sm:2px;
  --transition:0.3s ease;
  --font-sans:"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--text);
  line-height:1.8;
  font-size:1rem;
  letter-spacing:0.01em;
  overflow-x:hidden;
}
img{max-width:100%;height:auto;display:block}
a{text-decoration:none;color:inherit;transition:color var(--transition)}
a:hover{color:var(--accent)}
.container{max-width:1200px}
section{padding:96px 0}
.section-header{
  border-bottom:1px solid var(--border);
  padding-bottom:32px;
  margin-bottom:56px;
}
.section-tag{
  display:inline-flex;
  align-items:center;
  font-size:0.875rem;
  letter-spacing:0.18em;
  color:var(--accent);
  font-weight:600;
  margin-bottom:12px;
  text-transform:uppercase;
}
.section-tag::before{
  content:"";
  width:32px;
  height:1px;
  background:var(--accent);
  display:inline-block;
  margin-right:12px;
}
.section-title{
  font-size:clamp(2rem,3vw,2.375rem);
  font-weight:700;
  line-height:1.3;
  letter-spacing:0.02em;
  color:var(--primary);
  margin:0;
}
.section-desc{
  font-size:1rem;
  color:var(--text-light);
  margin-top:16px;
  max-width:480px;
}
/* ========== NAV ========== */
#mainNav{
  min-height:76px;
  padding-top:0;
  padding-bottom:0;
  background:rgba(255,255,255,0.06);
  backdrop-filter:blur(12px);
  -webkit-backdrop-filter:blur(12px);
  border-bottom:1px solid rgba(255,255,255,0.12);
  transition:background 0.4s ease,border-color 0.4s ease,box-shadow 0.4s ease;
  z-index:1080;
}
#mainNav .navbar-brand{
  font-size:1.25rem;
  font-weight:600;
  color:#fff;
  letter-spacing:0.02em;
  display:flex;
  align-items:center;
  gap:2px;
}
.brand-num{
  font-family:ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  letter-spacing:0.08em;
  font-size:1.125rem;
}
#mainNav .nav-link{
  color:#fff;
  font-size:0.9375rem;
  font-weight:500;
  padding:10px 14px;
  margin:0 2px;
  position:relative;
  transition:color 0.3s ease;
}
#mainNav .nav-link::after{
  content:"";
  position:absolute;
  left:14px;
  right:14px;
  bottom:4px;
  height:2px;
  background:var(--accent);
  transform:scaleX(0);
  transform-origin:left;
  transition:transform 0.3s ease;
}
#mainNav .nav-link:hover::after,
#mainNav .nav-link.active::after{
  transform:scaleX(1);
}
#mainNav .nav-link:hover{
  color:rgba(255,255,255,0.9);
}
#mainNav .nav-item:last-child .nav-link{
  margin-right:0;
}
#mainNav .nav-link.nav-link-category{
  border:1px solid rgba(255,255,255,0.3);
  padding:8px 16px;
  margin-left:10px;
  border-radius:0;
  font-size:0.875rem;
}
#mainNav .nav-link.nav-link-category:hover{
  background:rgba(255,255,255,0.12);
  border-color:rgba(255,255,255,0.5);
  color:#fff;
}
#mainNav .nav-link.nav-link-category:hover::after,
#mainNav .nav-link.nav-link-category.active::after{
  display:none;
}
#mainNav.navbar-scrolled{
  background:rgba(245,242,236,0.92);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-bottom:1px solid var(--border);
  box-shadow:var(--shadow-md);
}
#mainNav.navbar-scrolled .navbar-brand{
  color:var(--primary);
}
#mainNav.navbar-scrolled .nav-link{
  color:var(--text);
}
#mainNav.navbar-scrolled .nav-link:hover{
  color:var(--accent);
}
#mainNav.navbar-scrolled .nav-link.nav-link-category{
  border-color:rgba(31,58,52,0.3);
}
#mainNav.navbar-scrolled .nav-link.nav-link-category:hover{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
}
.navbar-toggler{
  border:none;
  padding:10px;
  outline:none;
  color:#fff;
}
#mainNav.navbar-scrolled .navbar-toggler{
  color:var(--primary);
}
.navbar-toggler-icon{
  background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='white' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 8h22M4 15h22M4 22h22'/%3e%3c/svg%3e");
}
#mainNav.navbar-scrolled .navbar-toggler-icon{
  background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%231F3A34' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 8h22M4 15h22M4 22h22'/%3e%3c/svg%3e");
}
@media(max-width:991.98px){
  #mainNav{
    min-height:62px;
    background:rgba(18,20,16,0.9);
  }
  #mainNav .navbar-collapse{
    background:var(--primary);
    padding:20px 16px;
    border-radius:0;
    margin-top:10px;
    border-top:1px solid rgba(255,255,255,0.1);
  }
  #mainNav .nav-link{
    color:#fff !important;
    padding:12px 8px;
    border-bottom:1px solid rgba(255,255,255,0.1);
  }
  #mainNav .nav-link.nav-link-category{
    border:1px solid rgba(255,255,255,0.25);
    margin-left:0;
    display:inline-block;
    margin-top:10px;
  }
  #mainNav.navbar-scrolled{
    background:rgba(18,20,16,0.95);
  }
  .navbar-toggler-icon{
    background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='white' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 8h22M4 15h22M4 22h22'/%3e%3c/svg%3e");
  }
}
/* ========== PAGE HERO ========== */
.page-hero{
  position:relative;
  min-height:420px;
  display:flex;
  align-items:flex-end;
  padding-top:180px;
  padding-bottom:72px;
  background:url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
  color:#fff;
}
.page-hero::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(90deg,rgba(0,0,0,0.65) 0%,rgba(0,0,0,0.35) 60%,rgba(0,0,0,0.2) 100%);
}
.page-hero .container{
  position:relative;
  z-index:2;
}
.breadcrumb{
  display:flex;
  align-items:center;
  gap:8px;
  font-size:0.875rem;
  color:rgba(255,255,255,0.75);
  margin-bottom:20px;
  padding:0;
  background:transparent;
}
.breadcrumb a{
  color:rgba(255,255,255,0.85);
  transition:color 0.2s;
}
.breadcrumb a:hover{
  color:#fff;
}
.breadcrumb .sep{
  color:rgba(255,255,255,0.5);
}
.page-hero h1{
  font-size:clamp(2.2rem,5vw,3.5rem);
  font-weight:700;
  line-height:1.2;
  letter-spacing:0.02em;
  margin-bottom:16px;
  max-width:780px;
}
.page-hero h1 .hl{
  color:var(--accent);
}
.page-hero .hero-sub{
  font-size:1.0625rem;
  color:rgba(255,255,255,0.88);
  max-width:640px;
  line-height:1.8;
  margin:0;
}
/* ========== OVERVIEW ========== */
.overview-section{
  background:var(--bg);
}
.overview-left{
  padding-right:40px;
}
.overview-right{
  font-size:1.0625rem;
  line-height:1.9;
  color:var(--text-light);
}
.overview-right p{
  margin-bottom:20px;
}
.overview-right .lead-text{
  font-size:1.1875rem;
  font-weight:600;
  color:var(--primary);
  line-height:1.7;
  border-left:3px solid var(--accent);
  padding-left:20px;
}
/* ========== MODULES ========== */
.modules-section{
  background:var(--card);
}
.module-row{
  display:flex;
  align-items:center;
  gap:0;
  margin-bottom:80px;
}
.module-row:last-child{
  margin-bottom:0;
}
.module-image{
  flex:0 0 46%;
  position:relative;
  overflow:hidden;
}
.module-image img{
  width:100%;
  aspect-ratio:4/3;
  object-fit:cover;
  transition:transform 0.5s ease;
}
.module-image:hover img{
  transform:scale(1.03);
}
.module-image .img-badge{
  position:absolute;
  top:16px;
  left:16px;
  background:rgba(18,20,16,0.72);
  color:#fff;
  font-size:0.8125rem;
  padding:6px 14px;
  border-radius:2px;
  letter-spacing:0.06em;
  backdrop-filter:blur(6px);
}
.module-content{
  padding:48px 56px;
}
.module-row:nth-child(even) .module-content{
  order:-1;
}
.module-content .module-num{
  font-size:0.9375rem;
  font-weight:600;
  color:var(--accent);
  letter-spacing:0.15em;
  margin-bottom:10px;
  display:block;
}
.module-content h3{
  font-size:1.75rem;
  font-weight:700;
  color:var(--primary);
  margin-bottom:16px;
  line-height:1.35;
}
.module-content p{
  font-size:0.987rem;
  color:var(--text-light);
  line-height:1.85;
  margin-bottom:20px;
}
.module-list{
  list-style:none;
  padding:0;
  margin:0 0 24px;
}
.module-list li{
  position:relative;
  padding-left:24px;
  font-size:0.9375rem;
  color:var(--text);
  margin-bottom:10px;
  line-height:1.6;
}
.module-list li::before{
  content:"✓";
  position:absolute;
  left:0;
  color:var(--accent);
  font-weight:700;
}
.module-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:0.9375rem;
  font-weight:600;
  color:var(--primary);
  cursor:pointer;
}
.module-link i{
  font-size:0.8125rem;
  transition:transform 0.2s ease;
}
.module-link:hover i{
  transform:translateX(4px);
}
/* ========== PROCESS ========== */
.process-section{
  background:var(--bg);
}
.process-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  margin-top:20px;
}
.process-step{
  padding:32px 24px;
  border:1px solid var(--border);
  background:#fff;
  position:relative;
  min-height:220px;
  transition:border-color 0.3s ease,transform 0.3s ease;
}
.process-step + .process-step{
  border-left:none;
}
.process-step:hover{
  border-color:var(--accent);
  transform:translateY(-3px);
  box-shadow:var(--shadow-sm);
  z-index:1;
}
.process-step .step-num{
  font-size:2.75rem;
  font-weight:700;
  color:rgba(31,58,52,0.1);
  line-height:1;
  display:block;
  margin-bottom:20px;
}
.process-step h4{
  font-size:1.125rem;
  font-weight:600;
  color:var(--primary);
  margin-bottom:10px;
}
.process-step p{
  font-size:0.875rem;
  color:var(--text-light);
  line-height:1.7;
  margin:0;
}
/* ========== QUOTE ========== */
.quote-section{
  background:var(--dark);
  padding:88px 0;
  color:#fff;
}
.quote-section .quote-content{
  max-width:760px;
  margin:0 auto;
  text-align:center;
}
.quote-section .quote-mark{
  font-size:3rem;
  color:var(--accent);
  line-height:1;
  margin-bottom:16px;
}
.quote-section blockquote{
  font-size:1.375rem;
  font-weight:600;
  line-height:1.7;
  letter-spacing:0.02em;
  margin-bottom:28px;
  color:rgba(255,255,255,0.92);
}
.quote-section .quote-source{
  font-size:0.9375rem;
  color:rgba(255,255,255,0.6);
  letter-spacing:0.08em;
}
/* ========== FAQ ========== */
.faq-section{
  background:var(--card);
}
.faq-left .faq-contact{
  margin-top:32px;
  padding-top:24px;
  border-top:1px solid var(--border);
}
.faq-left .faq-contact p{
  font-size:0.9375rem;
  color:var(--text-light);
  margin-bottom:12px;
}
.faq-list .faq-item{
  border:none;
  border-bottom:1px solid var(--border);
  border-radius:0;
  background:transparent;
}
.faq-list .faq-item:last-child{
  border-bottom:none;
}
.faq-list .faq-item .faq-btn{
  background:transparent;
  border:none;
  padding:20px 0;
  font-size:1.0625rem;
  font-weight:600;
  color:var(--text);
  text-align:left;
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:16px;
  text-decoration:none;
  cursor:pointer;
  transition:color 0.2s;
}
.faq-list .faq-item .faq-btn:hover{
  color:var(--primary);
}
.faq-list .faq-item .faq-btn:focus{
  box-shadow:none;
}
.faq-list .faq-item .faq-btn[aria-expanded="true"]{
  color:var(--primary);
}
.faq-list .faq-item .faq-btn .faq-icon{
  flex-shrink:0;
  width:28px;
  height:28px;
  display:flex;
  align-items:center;
  justify-content:center;
  border:1px solid var(--border);
  color:var(--accent);
  transition:all 0.3s ease;
}
.faq-list .faq-item .faq-btn[aria-expanded="true"] .faq-icon{
  background:var(--primary);
  color:#fff;
  border-color:var(--primary);
  transform:rotate(180deg);
}
.faq-list .faq-item .faq-body{
  padding:0 0 20px;
  font-size:0.9375rem;
  color:var(--text-light);
  line-height:1.8;
  border-bottom:1px solid rgba(169,132,90,0.35);
}
.faq-contact-btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:16px;
}
/* ========== CTA ========== */
.cta-section{
  background:var(--primary);
  padding:88px 0;
  color:#fff;
  position:relative;
  overflow:hidden;
}
.cta-section::before{
  content:"";
  position:absolute;
  top:-80px;
  right:-80px;
  width:300px;
  height:300px;
  border:1px solid rgba(169,132,90,0.4);
  border-radius:50%;
}
.cta-section::after{
  content:"";
  position:absolute;
  bottom:-120px;
  left:-60px;
  width:240px;
  height:240px;
  border:1px solid rgba(169,132,90,0.25);
  border-radius:50%;
}
.cta-section .container{
  position:relative;
  z-index:2;
}
.cta-title{
  font-size:clamp(1.75rem,3.5vw,2.5rem);
  font-weight:700;
  line-height:1.3;
  margin-bottom:16px;
}
.cta-desc{
  font-size:1.0625rem;
  color:rgba(255,255,255,0.75);
  max-width:560px;
  margin-bottom:32px;
  line-height:1.7;
}
.btn-cta-light{
  display:inline-flex;
  align-items:center;
  gap:10px;
  background:#fff;
  color:var(--primary);
  padding:14px 36px;
  font-weight:600;
  font-size:1rem;
  border:1px solid #fff;
  border-radius:0;
  transition:all 0.3s ease;
}
.btn-cta-light:hover{
  background:var(--accent);
  color:#fff;
  border-color:var(--accent);
  transform:translateY(-1px);
  box-shadow:0 2px 8px rgba(0,0,0,0.2);
}
.btn-cta-outline{
  display:inline-flex;
  align-items:center;
  gap:10px;
  background:transparent;
  color:#fff;
  padding:14px 36px;
  font-weight:600;
  font-size:1rem;
  border:1px solid rgba(255,255,255,0.6);
  border-radius:0;
  transition:all 0.3s ease;
}
.btn-cta-outline:hover{
  background:rgba(255,255,255,0.1);
  border-color:#fff;
  color:#fff;
}
/* ========== FOOTER ========== */
.site-footer{
  background:var(--dark);
  color:rgba(255,255,255,0.75);
  padding:72px 0 0;
  font-size:0.9375rem;
}
.site-footer .row{
  padding-bottom:48px;
}
.site-footer .footer-brand{
  font-size:1.375rem;
  font-weight:600;
  color:#fff;
  display:inline-block;
  margin-bottom:18px;
}
.site-footer .footer-desc{
  font-size:0.9375rem;
  color:rgba(255,255,255,0.65);
  line-height:1.7;
  max-width:300px;
}
.site-footer h5{
  font-size:1.0625rem;
  font-weight:600;
  color:#fff;
  margin-bottom:20px;
  letter-spacing:0.03em;
}
.site-footer .footer-links{
  list-style:none;
  padding:0;
  margin:0;
}
.site-footer .footer-links li{
  margin-bottom:10px;
}
.site-footer .footer-links a{
  color:rgba(255,255,255,0.65);
  font-size:0.9375rem;
  transition:color 0.2s ease,padding-left 0.2s ease;
}
.site-footer .footer-links a:hover{
  color:var(--accent);
  padding-left:4px;
}
.footer-contact-item{
  display:flex;
  align-items:flex-start;
  gap:12px;
  margin-bottom:12px;
  font-size:0.9375rem;
  color:rgba(255,255,255,0.65);
}
.footer-contact-item i{
  color:var(--accent);
  font-size:0.875rem;
  margin-top:5px;
}
.site-footer .footer-bottom{
  border-top:1px solid rgba(255,255,255,0.1);
  padding:20px 0;
  display:flex;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:8px;
}
.site-footer .footer-bottom p{
  font-size:0.8125rem;
  color:rgba(255,255,255,0.45);
  margin:0;
}
/* ========== BACK TOP ========== */
.back-top{
  position:fixed;
  right:30px;
  bottom:30px;
  width:48px;
  height:48px;
  background:var(--primary);
  color:#fff;
  border:none;
  border-radius:0;
  display:flex;
  align-items:center;
  justify-content:center;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transition:opacity 0.3s ease,visibility 0.3s ease,background 0.3s ease;
  z-index:1000;
}
.back-top.show{
  opacity:1;
  visibility:visible;
}
.back-top:hover{
  background:var(--accent);
  color:#fff;
}
.back-top:focus{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
/* ========== ANIMATION ========== */
@keyframes fadeUp{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}
.fade-up{
  opacity:0;
  transform:translateY(30px);
  transition:opacity 0.6s ease,transform 0.6s ease;
}
.fade-up.revealed{
  opacity:1;
  transform:translateY(0);
}
/* ========== BUTTONS ========== */
.btn-main{
  display:inline-flex;
  align-items:center;
  gap:10px;
  background:var(--primary);
  color:#fff;
  padding:14px 32px;
  font-size:1rem;
  font-weight:600;
  border:1px solid var(--primary);
  border-radius:0;
  cursor:pointer;
  transition:all 0.3s ease;
}
.btn-main:hover{
  background:var(--accent);
  border-color:var(--accent);
  color:#fff;
  transform:translateY(-1px);
  box-shadow:0 2px 8px rgba(0,0,0,0.12);
}
.btn-main:focus{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.btn-outline{
  display:inline-flex;
  align-items:center;
  gap:10px;
  background:transparent;
  color:var(--primary);
  padding:14px 32px;
  font-size:1rem;
  font-weight:600;
  border:1px solid var(--primary);
  border-radius:0;
  cursor:pointer;
  transition:all 0.3s ease;
}
.btn-outline:hover{
  background:var(--primary);
  color:#fff;
  transform:translateY(-1px);
  box-shadow:0 2px 8px rgba(0,0,0,0.12);
}
/* ========== RESPONSIVE ========== */
@media(max-width:991.98px){
  section{padding:80px 0}
  .module-row{
    flex-direction:column;
  }
  .module-row:nth-child(even) .module-content{
    order:0;
  }
  .module-image{
    flex:0 0 100%;
    width:100%;
  }
  .module-content{
    padding:40px 24px;
  }
  .process-grid{
    grid-template-columns:repeat(2,1fr);
  }
  .process-step + .process-step{
    border-left:1px solid var(--border);
    border-top:none;
  }
  .process-step:nth-child(3),
  .process-step:nth-child(4){
    border-top:1px solid var(--border);
  }
  .process-step:nth-child(odd){
    border-left:none;
  }
  .page-hero{
    min-height:380px;
    padding-top:160px;
  }
}
@media(max-width:767.98px){
  section{padding:64px 0}
  .page-hero{
    min-height:340px;
    padding-top:140px;
  }
  .page-hero h1{
    font-size:2rem;
  }
  .process-grid{
    grid-template-columns:1fr;
  }
  .process-step + .process-step{
    border-left:none;
    border-top:1px solid var(--border);
  }
  .section-title{
    font-size:1.75rem;
  }
  .site-footer .footer-bottom{
    flex-direction:column;
    align-items:center;
    text-align:center;
  }
}
@media(max-width:575.98px){
  .overview-left{
    padding-right:0;
  }
  .btn-cta-light,
  .btn-cta-outline{
    display:block;
    width:100%;
    text-align:center;
    margin-bottom:12px;
  }
  .back-top{
    right:16px;
    bottom:16px;
  }
}

/* roulang page: article */
/* ========== 设计变量 ========== */
        :root {
            --primary: #1F3A34;
            --primary-dark: #162B27;
            --accent: #A9845A;
            --accent-light: rgba(169, 132, 90, 0.12);
            --bg: #F5F2EC;
            --dark-bg: #121410;
            --card-bg: #FFFFFF;
            --text: #2B2A27;
            --text-muted: #6C6A64;
            --border: rgba(31, 58, 52, 0.14);
            --border-light: rgba(255, 255, 255, 0.12);
            --shadow-nav: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-btn: 0 2px 8px rgba(0, 0, 0, 0.12);
            --font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
            --transition: all .3s ease;
        }

        /* ========== Reset & Base ========== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-family);
            background: var(--bg);
            color: var(--text);
            line-height: 1.8;
            letter-spacing: .01em;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color .2s ease;
        }

        a:hover {
            color: var(--accent);
        }

        .container {
            max-width: 1200px;
        }

        /* ========== 按钮 ========== */
        .btn {
            border-radius: 0;
            padding: 14px 32px;
            font-weight: 600;
            transition: var(--transition);
            border: 1px solid transparent;
            letter-spacing: .02em;
        }

        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            color: #fff;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--accent);
            border-color: var(--accent);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-btn);
        }

        .btn-light {
            background: #fff;
            border-color: #fff;
            color: var(--primary);
        }

        .btn-light:hover,
        .btn-light:focus {
            background: var(--accent);
            border-color: var(--accent);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-btn);
        }

        .btn-outline-light {
            background: transparent;
            border: 1px solid rgba(255, 255, 255, .85);
            color: #fff;
        }

        .btn-outline-light:hover,
        .btn-outline-light:focus {
            background: #fff;
            border-color: #fff;
            color: var(--primary);
        }

        .btn:focus,
        .btn:active:focus {
            box-shadow: 0 0 0 3px rgba(31, 58, 52, 0.15);
            outline: none;
        }

        /* ========== 导航 ========== */
        #mainNav {
            padding-top: 1rem;
            padding-bottom: 1rem;
            background: rgba(255, 255, 255, 0.06);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
            min-height: 76px;
        }

        #mainNav .navbar-brand {
            font-size: 1.35rem;
            font-weight: 600;
            color: #fff;
            letter-spacing: .02em;
            display: flex;
            align-items: center;
        }

        #mainNav .navbar-brand .brand-num {
            font-family: 'SF Mono', 'Cascadia Code', Consolas, monospace;
            letter-spacing: .08em;
            margin-right: .1em;
            font-weight: 600;
        }

        #mainNav .nav-link {
            color: rgba(255, 255, 255, .92);
            font-weight: 500;
            font-size: .9375rem;
            padding: .75rem 1rem;
            border-radius: 0;
            transition: color .2s ease, border-color .2s ease;
            position: relative;
        }

        #mainNav .nav-link:hover,
        #mainNav .nav-link:focus {
            color: var(--accent);
        }

        #mainNav .nav-link.active {
            color: #fff;
        }

        #mainNav .nav-link.active::after {
            content: '';
            position: absolute;
            left: 1rem;
            right: 1rem;
            bottom: .4rem;
            height: 2px;
            background: var(--accent);
        }

        /* 滚动吸顶后的实底态 */
        #mainNav.scrolled {
            background: rgba(245, 242, 236, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(31, 58, 52, 0.08);
            box-shadow: var(--shadow-nav);
            padding-top: .625rem;
            padding-bottom: .625rem;
        }

        #mainNav.scrolled .navbar-brand,
        #mainNav.scrolled .nav-link {
            color: var(--text);
        }

        #mainNav.scrolled .nav-link.active {
            color: var(--primary);
        }

        #mainNav.scrolled .nav-link.active::after {
            background: var(--accent);
        }

        /* 内页文章页：导航初始即为实底暖白态 */
        body.article-page #mainNav {
            background: rgba(245, 242, 236, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(31, 58, 52, 0.08);
        }

        body.article-page #mainNav .navbar-brand,
        body.article-page #mainNav .nav-link {
            color: var(--text);
        }

        body.article-page #mainNav .nav-link.active {
            color: var(--primary);
        }

        body.article-page #mainNav .nav-link.active::after {
            background: var(--accent);
        }

        /* 导航折叠按钮 */
        .navbar-toggler {
            border: none;
            padding: .5rem .6rem;
            --bs-navbar-toggler-focus-width: 0;
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(31, 58, 52, 0.25);
            outline: none;
        }

        .navbar-toggler-icon {
            background-image: none !important;
            width: 26px;
            height: 2px;
            background: #fff;
            position: relative;
            display: inline-block;
            transition: var(--transition);
        }

        .navbar-toggler-icon::before,
        .navbar-toggler-icon::after {
            content: '';
            position: absolute;
            left: 0;
            width: 100%;
            height: 2px;
            background: inherit;
            transition: var(--transition);
        }

        .navbar-toggler-icon::before {
            top: -8px;
        }

        .navbar-toggler-icon::after {
            top: 8px;
        }

        body.article-page .navbar-toggler-icon,
        #mainNav.scrolled .navbar-toggler-icon {
            background: var(--text);
        }

        /* ========== 文章 Hero ========== */
        .article-hero {
            padding: calc(76px + 44px) 0 44px;
            background: var(--bg);
            border-bottom: 1px solid var(--border);
        }

        .breadcrumb-nav {
            margin-bottom: 18px;
        }

        .breadcrumb-nav .breadcrumb {
            margin: 0;
            font-size: .875rem;
            --bs-breadcrumb-divider: '/';
        }

        .breadcrumb-nav .breadcrumb-item a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color .2s ease;
        }

        .breadcrumb-nav .breadcrumb-item a:hover {
            color: var(--primary);
        }

        .breadcrumb-nav .breadcrumb-item.active {
            color: var(--text-muted);
        }

        .article-hero h1 {
            font-size: clamp(1.85rem, 3.4vw, 2.6rem);
            font-weight: 700;
            line-height: 1.3;
            color: var(--primary);
            max-width: 900px;
            margin: 0 0 18px;
            word-break: break-word;
            letter-spacing: .02em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 24px;
            font-size: .875rem;
            color: var(--text-muted);
        }

        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 7px;
        }

        .article-meta .meta-item i {
            color: var(--accent);
            font-size: .8125rem;
        }

        /* ========== 文章正文 ========== */
        .article-content {
            background: var(--card-bg);
            padding: 72px 0 80px;
        }

        .article-col {
            max-width: 780px;
        }

        .article-body {
            font-size: 1.0625rem;
            line-height: 1.9;
            color: var(--text);
        }

        .article-body p {
            margin-bottom: 1.5em;
        }

        .article-body h2 {
            font-size: 1.75rem;
            font-weight: 700;
            color: var(--primary);
            margin: 2.2em 0 1em;
            line-height: 1.4;
        }

        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: var(--primary);
            margin: 2em 0 .8em;
            line-height: 1.4;
        }

        .article-body h4 {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--primary);
            margin: 1.8em 0 .7em;
        }

        .article-body blockquote {
            border-left: 3px solid var(--accent);
            background: rgba(169, 132, 90, 0.07);
            padding: 1.25rem 1.5rem;
            margin: 1.75rem 0;
            color: var(--text-muted);
            font-style: normal;
        }

        .article-body img {
            display: block;
            max-width: 100%;
            height: auto;
            margin: 1.75rem auto;
        }

        .article-body figure {
            margin: 1.75rem 0;
        }

        .article-body figure figcaption {
            font-size: .875rem;
            color: var(--text-muted);
            text-align: center;
            margin-top: -.75rem;
        }

        .article-body ul,
        .article-body ol {
            margin-bottom: 1.5em;
            padding-left: 1.5em;
        }

        .article-body li {
            margin-bottom: .45em;
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: .9375rem;
        }

        .article-body table th,
        .article-body table td {
            border: 1px solid var(--border);
            padding: 12px 16px;
            text-align: left;
        }

        .article-body table th {
            background: var(--bg);
            font-weight: 600;
        }

        .article-body code {
            background: rgba(31, 58, 52, 0.06);
            padding: 2px 6px;
            font-size: .9em;
            border-radius: 2px;
        }

        .article-body pre {
            background: var(--dark-bg);
            color: #fff;
            padding: 1.25rem;
            overflow-x: auto;
            margin: 1.5rem 0;
            border-radius: 0;
        }

        .article-body pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        .article-body a {
            color: var(--primary);
            border-bottom: 1px solid rgba(31, 58, 52, .3);
            transition: border-color .2s ease, color .2s ease;
        }

        .article-body a:hover {
            color: var(--accent);
            border-bottom-color: var(--accent);
        }

        /* ========== 空状态 ========== */
        .article-empty {
            text-align: center;
            padding: 64px 24px;
            border: 1px dashed var(--border);
            background: var(--bg);
        }

        .article-empty .empty-icon {
            font-size: 2.5rem;
            color: var(--accent);
            display: block;
            margin-bottom: 16px;
        }

        .article-empty h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
        }

        .article-empty p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }

        /* ========== 文章底部导航 ========== */
        .article-footer-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 32px;
            margin-top: 56px;
            border-top: 1px solid var(--border);
        }

        .article-footer-nav a {
            color: var(--text-muted);
            font-size: .9375rem;
            transition: color .2s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .article-footer-nav a:hover {
            color: var(--primary);
        }

        .article-footer-nav .back-home {
            color: var(--primary);
            font-weight: 500;
        }

        /* ========== 相关推荐 ========== */
        .related-section {
            padding: 88px 0;
            background: var(--bg);
        }

        .section-heading {
            margin-bottom: 40px;
        }

        .section-tag {
            display: inline-block;
            font-size: .8125rem;
            font-weight: 600;
            letter-spacing: .12em;
            text-transform: uppercase;
            color: var(--accent);
            background: var(--accent-light);
            padding: 4px 12px;
            border-radius: 2px;
            margin-bottom: 12px;
        }

        .section-heading h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin: 0;
            padding-bottom: 16px;
            position: relative;
        }

        .section-heading h2::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: 0;
            width: 64px;
            height: 2px;
            background: var(--accent);
        }

        .related-card {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: 0;
            overflow: hidden;
            transition: var(--transition);
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .related-card:hover {
            box-shadow: var(--shadow-nav);
            transform: translateY(-2px);
        }

        .card-img-wrap {
            display: block;
            overflow: hidden;
            aspect-ratio: 4 / 3;
            background: var(--bg);
        }

        .card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform .4s ease;
        }

        .related-card:hover .card-img-wrap img {
            transform: scale(1.03);
        }

        .card-content {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .badge-tag {
            display: inline-block;
            font-size: .8125rem;
            color: var(--primary);
            background: var(--accent-light);
            padding: 3px 10px;
            border-radius: 2px;
            margin-bottom: 12px;
            align-self: flex-start;
            font-weight: 500;
        }

        .card-content h3 {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--text);
            margin-bottom: 10px;
            line-height: 1.5;
        }

        .card-content h3 a {
            color: inherit;
        }

        .card-content h3 a:hover {
            color: var(--primary);
        }

        .card-content p {
            font-size: .9375rem;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
            flex: 1;
        }

        .read-more {
            font-size: .875rem;
            font-weight: 500;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: gap .2s ease, color .2s ease;
        }

        .read-more:hover {
            color: var(--accent);
            gap: 10px;
        }

        /* ========== CTA ========== */
        .article-cta {
            background: var(--primary);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }

        .article-cta::before {
            content: '';
            position: absolute;
            top: -40px;
            right: -80px;
            width: 260px;
            height: 260px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transform: rotate(45deg);
        }

        .cta-inner {
            position: relative;
            z-index: 1;
        }

        .article-cta h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: .02em;
        }

        .article-cta p {
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.85);
            margin: 0;
            line-height: 1.8;
            max-width: 560px;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--dark-bg);
            color: rgba(255, 255, 255, 0.8);
            padding: 64px 0 0;
            font-size: .9375rem;
        }

        .site-footer .footer-brand {
            font-size: 1.25rem;
            font-weight: 600;
            color: #fff;
            display: inline-flex;
            align-items: center;
            margin-bottom: 14px;
            letter-spacing: .02em;
            text-decoration: none;
        }

        .site-footer .footer-brand .brand-num {
            font-family: 'SF Mono', 'Cascadia Code', Consolas, monospace;
            letter-spacing: .08em;
            margin-right: .1em;
        }

        .site-footer .footer-desc {
            font-size: .875rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.55);
            margin-bottom: 0;
            max-width: 320px;
        }

        .site-footer h5 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: .04em;
        }

        .site-footer .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        .site-footer .footer-links li {
            margin-bottom: 10px;
        }

        .site-footer .footer-links a {
            color: rgba(255, 255, 255, 0.6);
            font-size: .875rem;
            text-decoration: none;
            transition: color .2s ease, padding-left .2s ease;
        }

        .site-footer .footer-links a:hover {
            color: var(--accent);
            padding-left: 4px;
        }

        .footer-contact-item {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            margin-bottom: 12px;
            color: rgba(255, 255, 255, 0.6);
            font-size: .875rem;
        }

        .footer-contact-item i {
            color: var(--accent);
            margin-top: 5px;
            width: 16px;
            text-align: center;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 22px 0;
            margin-top: 40px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 8px;
            font-size: .8125rem;
            color: rgba(255, 255, 255, 0.45);
        }

        .footer-bottom p {
            margin: 0;
            line-height: 1.6;
        }

        /* ========== 动效 ========== */
        .js .fade-up {
            opacity: 0;
            transform: translateY(16px);
            transition: opacity .6s ease, transform .6s ease;
        }

        .js .fade-up.visible {
            opacity: 1;
            transform: none;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 991.98px) {
            #mainNav {
                min-height: 62px;
                padding-top: .625rem;
                padding-bottom: .625rem;
            }

            #mainNav .navbar-collapse {
                background: var(--dark-bg);
                padding: 16px 20px;
                margin-top: 12px;
                border: 1px solid rgba(255, 255, 255, 0.08);
                max-height: calc(100vh - 90px);
                overflow-y: auto;
            }

            #mainNav .navbar-collapse .nav-link {
                color: #fff !important;
                padding: .8rem 0;
                font-size: 1.0625rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.07);
            }

            #mainNav .navbar-collapse .nav-link:last-child {
                border-bottom: none;
            }

            #mainNav .navbar-collapse .nav-link.active::after {
                display: none;
            }

            #mainNav .navbar-collapse .nav-link.active {
                color: var(--accent) !important;
                font-weight: 600;
            }

            .article-hero {
                padding-top: calc(62px + 32px);
                padding-bottom: 32px;
            }

            .article-content {
                padding: 56px 0 64px;
            }

            .related-section {
                padding: 64px 0;
            }

            .article-cta {
                padding: 56px 0;
            }

            .article-cta h2 {
                font-size: 1.625rem;
            }
        }

        @media (max-width: 767.98px) {
            .article-hero h1 {
                font-size: 1.6rem;
                line-height: 1.4;
            }

            .article-body {
                font-size: 1rem;
                line-height: 1.85;
            }

            .article-body h2 {
                font-size: 1.45rem;
            }

            .article-body h3 {
                font-size: 1.2rem;
            }

            .related-card .card-content {
                padding: 20px;
            }

            .article-footer-nav {
                flex-direction: column;
                justify-content: center;
                text-align: center;
            }
        }

        @media (max-width: 575.98px) {
            .article-hero h1 {
                font-size: 1.45rem;
            }

            .article-meta {
                gap: 8px 16px;
                font-size: .8125rem;
            }

            .article-content {
                padding: 40px 0 48px;
            }

            .section-heading h2 {
                font-size: 1.5rem;
            }

            .article-cta h2 {
                font-size: 1.375rem;
            }

            .btn {
                padding: 12px 24px;
                font-size: .9375rem;
            }

            .site-footer {
                padding-top: 48px;
            }

            .footer-bottom {
                flex-direction: column;
                text-align: center;
                justify-content: center;
            }
        }