/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #0F766E;
            --primary-dark: #0D5953;
            --accent: #B45309;
            --accent-bright: #F59E0B;
            --bg: #FAFAF7;
            --bg-alt: #F3F1EC;
            --bg-deep: #EFECE6;
            --ink: #1C1917;
            --ink-sub: #57534E;
            --line: #E7E0D9;
            --success: #059669;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 6px;
            --shadow-soft: 0 8px 24px rgba(28,25,23,0.06);
            --shadow-hover: 0 16px 36px rgba(28,25,23,0.10);
            --transition: all 0.3s ease;
            --container-max: 1200px;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            background: var(--bg);
            color: var(--ink);
            line-height: 1.8;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

        a {
            color: inherit;
            text-decoration: none;
        }

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

        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
            border: none;
            outline: none;
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        /* ===== Typography ===== */
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 0.8em;
            letter-spacing: 0.01em;
        }

        h1 {
            font-size: clamp(34px, 5vw, 56px);
            line-height: 1.3;
        }

        h2 {
            font-size: clamp(26px, 3vw, 38px);
            line-height: 1.4;
        }

        h3 {
            font-size: clamp(20px, 2vw, 26px);
            line-height: 1.5;
        }

        p {
            margin-bottom: 1em;
            color: var(--ink-sub);
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 500;
            color: var(--accent);
            background: rgba(180, 83, 9, 0.08);
            padding: 4px 14px;
            border-radius: var(--radius-sm);
            margin-bottom: 16px;
            letter-spacing: 0.04em;
            text-transform: uppercase;
        }

        .section-heading {
            font-size: clamp(26px, 3vw, 38px);
            font-weight: 600;
            line-height: 1.4;
            margin-bottom: 12px;
            color: var(--ink);
        }

        .section-sub {
            font-size: 16px;
            color: var(--ink-sub);
            max-width: 640px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .text-center {
            text-align: center;
        }

        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 500;
            line-height: 1.2;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            border: 1px solid transparent;
            background: none;
            text-decoration: none;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

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

        .btn-outline:hover {
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 10px 20px;
            font-size: 14px;
        }

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

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

        .btn-white:hover {
            background: var(--bg-alt);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 72px;
            background: rgba(250, 250, 247, 0.92);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            z-index: 900;
            transition: box-shadow 0.3s ease;
        }

        .site-header.scrolled {
            box-shadow: 0 4px 24px rgba(28, 25, 23, 0.06);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }

        .logo-main {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            letter-spacing: 0.01em;
            line-height: 1.2;
        }

        .logo-badge {
            font-size: 11px;
            font-weight: 500;
            background: var(--ink);
            color: #fff;
            padding: 3px 8px;
            border-radius: var(--radius-sm);
            letter-spacing: 0.05em;
            white-space: nowrap;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 40px;
        }

        .main-nav a {
            font-size: 14px;
            color: var(--ink-sub);
            text-decoration: none;
            position: relative;
            padding: 6px 0;
            transition: color 0.3s ease;
            line-height: 1.4;
        }

        .main-nav a:hover {
            color: var(--ink);
        }

        .main-nav a.active {
            color: var(--ink);
            font-weight: 500;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px;
        }

        .header-cta {
            margin-left: 8px;
        }

        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 40px;
            height: 40px;
            background: transparent;
            border: none;
            cursor: pointer;
            gap: 5px;
            border-radius: var(--radius-sm);
            transition: background 0.3s ease;
        }

        .hamburger:hover {
            background: rgba(0, 0, 0, 0.04);
        }

        .hamburger span {
            display: block;
            width: 20px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: all 0.3s ease;
        }

        .hamburger.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }

        .hamburger.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* Mobile nav panel */
        .mobile-nav {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            background: rgba(250, 250, 247, 0.98);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
            padding: 16px 24px 24px;
            z-index: 890;
            box-shadow: 0 16px 36px rgba(28, 25, 23, 0.08);
        }

        .mobile-nav.open {
            display: block;
        }

        .mobile-nav a {
            display: block;
            font-size: 16px;
            color: var(--ink-sub);
            padding: 14px 0;
            border-bottom: 1px solid rgba(231, 224, 217, 0.5);
            text-decoration: none;
        }

        .mobile-nav a:last-child {
            border-bottom: none;
        }

        .mobile-nav a.active {
            color: var(--primary);
            font-weight: 500;
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 65vh;
            display: flex;
            align-items: center;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            padding: 140px 0 100px;
            margin-top: 72px;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: linear-gradient(to bottom, rgba(250, 250, 247, 0.2) 0%, rgba(250, 250, 247, 0.6) 50%, rgba(250, 250, 247, 1) 100%);
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
        }

        .hero h1 {
            font-size: clamp(34px, 5vw, 56px);
            line-height: 1.3;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 20px;
        }

        .hero-sub {
            font-size: 18px;
            line-height: 1.8;
            color: var(--ink-sub);
            max-width: 560px;
            margin-bottom: 32px;
        }

        .hero-ctas {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 8px;
        }

        .trust-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(255, 255, 255, 0.85);
            border: 1px solid var(--line);
            border-radius: 6px;
            padding: 8px 14px;
            font-size: 13px;
            color: var(--ink-sub);
            backdrop-filter: blur(4px);
        }

        .trust-badge svg {
            width: 14px;
            height: 14px;
            fill: var(--primary);
        }

        /* ===== Sections ===== */
        .section {
            padding: 96px 0;
        }

        .section-alt {
            background: var(--bg-alt);
        }

        .section-deep {
            background: var(--bg-deep);
        }

        .section-white {
            background: var(--bg);
        }

        /* ===== Features Z-layout ===== */
        .feature-row {
            display: flex;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

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

        .feature-row.reverse {
            flex-direction: row-reverse;
        }

        .feature-media {
            flex: 1;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-soft);
            background: var(--bg-alt);
        }

        .feature-media img {
            width: 100%;
            height: 320px;
            object-fit: cover;
            border-radius: var(--radius-lg);
            transition: transform 0.5s ease;
        }

        .feature-media:hover img {
            transform: scale(1.02);
        }

        .feature-content {
            flex: 1;
        }

        .feature-content h3 {
            margin-bottom: 16px;
        }

        .feature-content p {
            line-height: 1.9;
            margin-bottom: 16px;
        }

        .feature-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
        }

        .feature-tag {
            display: inline-block;
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary);
            font-size: 12px;
            padding: 4px 12px;
            border-radius: 999px;
            font-weight: 500;
        }

        /* ===== Demo Section ===== */
        .demo-grid {
            display: flex;
            gap: 64px;
            align-items: center;
        }

        .demo-list {
            flex: 1;
        }

        .demo-list-item {
            display: flex;
            gap: 16px;
            padding: 20px 0;
            border-bottom: 1px solid var(--line);
        }

        .demo-list-item:last-child {
            border-bottom: none;
        }

        .demo-icon {
            flex-shrink: 0;
            width: 44px;
            height: 44px;
            background: rgba(15, 118, 110, 0.1);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
        }

        .demo-icon svg {
            width: 22px;
            height: 22px;
        }

        .demo-text h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--ink);
        }

        .demo-text p {
            font-size: 14px;
            color: var(--ink-sub);
            margin-bottom: 0;
            line-height: 1.6;
        }

        .demo-media {
            flex: 1;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-hover);
            background: var(--bg);
        }

        .demo-media img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }

        /* ===== Testimonials ===== */
        .testimonials-grid {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
        }

        .testimonial-card {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 28px;
            flex: 1;
            min-width: 0;
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
            margin-top: 0;
        }

        .testimonial-card:nth-child(1) {
            margin-top: 16px;
        }

        .testimonial-card:nth-child(2) {
            margin-top: 40px;
        }

        .testimonial-card:nth-child(3) {
            margin-top: 64px;
        }

        .testimonial-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
        }

        .testimonial-stars {
            color: var(--accent-bright);
            font-size: 14px;
            letter-spacing: 2px;
            margin-bottom: 16px;
        }

        .testimonial-text {
            font-size: 15px;
            line-height: 1.8;
            color: var(--ink-sub);
            margin-bottom: 20px;
        }

        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .testimonial-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(15, 118, 110, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-weight: 600;
            font-size: 14px;
        }

        .testimonial-name {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
        }

        .testimonial-role {
            font-size: 12px;
            color: var(--ink-sub);
        }

        /* ===== Pricing ===== */
        .pricing-grid {
            display: flex;
            gap: 24px;
            align-items: center;
            flex-wrap: wrap;
        }

        .pricing-card {
            flex: 1;
            min-width: 0;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 36px 28px;
            text-align: center;
            transition: var(--transition);
            box-shadow: var(--shadow-soft);
        }

        .pricing-card:hover {
            box-shadow: var(--shadow-hover);
            transform: translateY(-4px);
            border-color: var(--line);
        }

        .pricing-card.featured {
            border: 2px solid var(--primary);
            box-shadow: 0 16px 48px rgba(15, 118, 110, 0.12);
            transform: scale(1.03);
            position: relative;
            z-index: 2;
        }

        .pricing-card.featured:hover {
            transform: scale(1.03) translateY(-4px);
        }

        .pricing-badge {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: 11px;
            font-weight: 500;
            padding: 3px 12px;
            border-radius: 999px;
            margin-bottom: 12px;
        }

        .pricing-name {
            font-size: 18px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
        }

        .pricing-price {
            font-size: 40px;
            font-weight: 600;
            color: var(--ink);
            line-height: 1.2;
            margin-bottom: 4px;
        }

        .pricing-price span {
            font-size: 16px;
            font-weight: 400;
            color: var(--ink-sub);
        }

        .pricing-desc {
            font-size: 14px;
            color: var(--ink-sub);
            margin-bottom: 24px;
        }

        .pricing-features {
            text-align: left;
            margin-bottom: 28px;
        }

        .pricing-features li {
            font-size: 14px;
            color: var(--ink-sub);
            padding: 8px 0;
            border-bottom: 1px solid rgba(231, 224, 217, 0.4);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .pricing-features li:last-child {
            border-bottom: none;
        }

        .pricing-features li::before {
            content: '✓';
            color: var(--success);
            font-weight: 600;
        }

        .pricing-card .btn {
            width: 100%;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
        }

        .accordion-item {
            background: transparent;
            border-bottom: 1px solid var(--line);
        }

        .accordion-item:first-child {
            border-top: 1px solid var(--line);
        }

        .accordion-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            padding: 0;
            line-height: 54px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            background: transparent;
            border: none;
            text-decoration: none;
            transition: color 0.3s ease;
        }

        .accordion-title:hover,
        .accordion-title:focus {
            background: transparent;
            color: var(--primary);
        }

        .accordion-title::after {
            content: '+';
            font-size: 22px;
            color: var(--primary);
            transition: transform 0.3s ease;
            order: 2;
            margin-left: 16px;
        }

        .accordion-item.is-active .accordion-title::after {
            transform: rotate(45deg);
        }

        .accordion-content {
            background: transparent;
            color: var(--ink-sub);
            font-size: 15px;
            line-height: 1.8;
            padding: 4px 24px 24px 0;
            border: none;
        }

        .accordion-content p {
            margin-bottom: 0;
        }

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

        .news-header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 40px;
            flex-wrap: wrap;
            gap: 12px;
        }

        .news-header .section-heading {
            margin-bottom: 4px;
        }

        .news-all-link {
            font-size: 14px;
            color: var(--primary);
            text-decoration: none;
            padding: 8px 0;
            border-bottom: 1px solid transparent;
            transition: border-color 0.3s ease;
        }

        .news-all-link:hover {
            border-bottom-color: var(--primary);
        }

        .news-list {
            display: flex;
            flex-direction: column;
        }

        .news-item {
            display: flex;
            align-items: center;
            gap: 20px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 16px 20px;
            margin-bottom: 12px;
            transition: var(--transition);
            text-decoration: none;
        }

        .news-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-soft);
            transform: translateX(4px);
        }

        .news-date {
            flex-shrink: 0;
            text-align: center;
            min-width: 56px;
            padding-right: 20px;
            border-right: 1px solid var(--line);
        }

        .news-day {
            font-size: 24px;
            font-weight: 600;
            color: var(--accent);
            line-height: 1.1;
            display: block;
        }

        .news-month {
            font-size: 12px;
            color: var(--ink-sub);
            text-transform: uppercase;
            letter-spacing: 0.03em;
        }

        .news-info {
            flex: 1;
            min-width: 0;
        }

        .news-info h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .news-info p {
            font-size: 14px;
            color: var(--ink-sub);
            line-height: 1.6;
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .news-cat {
            flex-shrink: 0;
            display: inline-block;
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary);
            font-size: 12px;
            font-weight: 500;
            padding: 4px 10px;
            border-radius: var(--radius-sm);
            white-space: nowrap;
        }

        .news-arrow {
            flex-shrink: 0;
            color: var(--ink-sub);
            font-size: 18px;
            transition: color 0.3s ease, transform 0.3s ease;
        }

        .news-item:hover .news-arrow {
            color: var(--primary);
            transform: translateX(4px);
        }

        /* Empty state */
        .news-empty {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            border: 1px dashed #D6CEC5;
            background: #F5F2EE;
            border-radius: 16px;
            padding: 48px 24px;
            text-align: center;
            color: var(--ink-sub);
            font-size: 15px;
        }

        .news-empty svg {
            width: 48px;
            height: 48px;
            margin-bottom: 16px;
            color: var(--ink-sub);
            opacity: 0.5;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary);
            color: #fff;
            padding: 96px 0;
        }

        .cta-section h2 {
            color: #fff;
            font-size: clamp(26px, 3vw, 38px);
            margin-bottom: 12px;
        }

        .cta-section p {
            color: rgba(255, 255, 255, 0.9);
            font-size: 16px;
            max-width: 560px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .cta-btns {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1C1917;
            color: #A8A29E;
            padding: 64px 0 24px;
        }

        .footer-grid {
            display: flex;
            gap: 64px;
            flex-wrap: wrap;
            margin-bottom: 48px;
        }

        .footer-brand {
            flex: 2;
            min-width: 240px;
        }

        .footer-logo {
            font-size: 20px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-logo .logo-badge {
            background: #fff;
            color: #1C1917;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #A8A29E;
            max-width: 300px;
        }

        .footer-links {
            flex: 3;
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
        }

        .footer-link-group {
            flex: 1;
            min-width: 120px;
        }

        .footer-link-group h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-link-group a {
            display: block;
            font-size: 14px;
            color: #A8A29E;
            text-decoration: none;
            padding: 6px 0;
            transition: color 0.3s ease;
        }

        .footer-link-group a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #3F3B38;
            padding-top: 24px;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 13px;
            color: #A8A29E;
            margin-bottom: 0;
        }

        /* ===== Floating CTA ===== */
        .float-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 800;
            background: var(--primary);
            color: #fff;
            padding: 14px 28px;
            border-radius: 999px;
            font-size: 15px;
            font-weight: 500;
            box-shadow: 0 12px 32px rgba(15, 118, 110, 0.35);
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            opacity: 0;
            transform: translateY(16px);
            pointer-events: none;
            transition: opacity 0.4s ease, transform 0.4s ease, background 0.3s ease;
        }

        .float-cta.visible {
            opacity: 1;
            transform: translateY(0);
            pointer-events: auto;
        }

        .float-cta:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
        }

        .float-cta svg {
            width: 18px;
            height: 18px;
            fill: currentColor;
        }

        /* ===== Responsive ===== */
        @media screen and (max-width: 1023px) {
            .section {
                padding: 72px 0;
            }

            .feature-row {
                gap: 40px;
            }

            .demo-grid {
                gap: 40px;
            }

            .pricing-card.featured {
                transform: scale(1);
            }

            .pricing-card.featured:hover {
                transform: translateY(-4px);
            }
        }

        @media screen and (max-width: 767px) {
            body {
                font-size: 15px;
            }

            .section {
                padding: 64px 0;
            }

            .main-nav {
                display: none;
            }

            .header-cta {
                display: none;
            }

            .hamburger {
                display: flex;
            }

            .hero {
                min-height: auto;
                padding: 120px 0 80px;
            }

            .hero-sub {
                font-size: 16px;
            }

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

            .hero-ctas .btn {
                width: 100%;
            }

            .hero-trust {
                gap: 8px;
            }

            .trust-badge {
                padding: 6px 10px;
                font-size: 12px;
            }

            .feature-row,
            .feature-row.reverse {
                flex-direction: column;
                gap: 32px;
                margin-bottom: 64px;
            }

            .feature-media img {
                height: 220px;
            }

            .demo-grid {
                flex-direction: column-reverse;
                gap: 32px;
            }

            .demo-media img {
                height: 260px;
            }

            .testimonials-grid {
                flex-direction: column;
                gap: 20px;
            }

            .testimonial-card {
                margin-top: 0 !important;
            }

            .pricing-grid {
                flex-direction: column;
            }

            .pricing-card.featured {
                order: -1;
            }

            .news-item {
                flex-wrap: wrap;
                gap: 12px;
            }

            .news-date {
                border-right: none;
                padding-right: 0;
                min-width: auto;
                display: flex;
                align-items: baseline;
                gap: 4px;
                width: 100%;
            }

            .news-day {
                font-size: 18px;
            }

            .news-cat {
                margin-left: auto;
            }

            .cta-btns {
                flex-direction: column;
            }

            .cta-btns .btn {
                width: 100%;
            }

            .footer-grid {
                gap: 40px;
                flex-direction: column;
            }

            .float-cta {
                bottom: 20px;
                right: 20px;
                width: 56px;
                height: 56px;
                padding: 0;
                border-radius: 50%;
                justify-content: center;
                font-size: 0;
            }

            .float-cta svg {
                width: 20px;
                height: 20px;
            }
        }

        @media screen and (max-width: 520px) {
            .row {
                padding-left: 16px;
                padding-right: 16px;
            }

            .container {
                padding-left: 16px;
                padding-right: 16px;
            }

            .header-inner {
                padding: 0 16px;
            }

            .logo-main {
                font-size: 18px;
            }

            .section {
                padding: 48px 0;
            }

            .section-heading {
                font-size: 24px;
            }

            .news-item {
                padding: 14px;
            }

            .news-info h4 {
                font-size: 15px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #0F766E;
            --primary-dark: #0D5953;
            --accent: #B45309;
            --accent-bright: #F59E0B;
            --bg: #FAFAF7;
            --bg-alt: #F3F1EC;
            --bg-deep: #EFECE6;
            --ink: #1C1917;
            --ink-sub: #57534E;
            --line: #E7E0D9;
            --success: #059669;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 6px;
            --shadow-soft: 0 8px 24px rgba(28,25,23,0.06);
            --shadow-hover: 0 16px 36px rgba(28,25,23,0.10);
            --transition: all 0.3s ease;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", "Helvetica Neue", sans-serif;
            background: var(--bg);
            color: var(--ink);
            font-size: 16px;
            line-height: 1.8;
            -webkit-font-smoothing: antialiased;
        }

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

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

        ul,
        ol {
            list-style: none;
        }

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

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 500;
            border: 1px solid transparent;
            transition: var(--transition);
            cursor: pointer;
            line-height: 1.4;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
            color: #fff;
        }

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

        .btn-outline:hover {
            background: rgba(15, 118, 110, 0.08);
            transform: translateY(-2px);
            box-shadow: var(--shadow-soft);
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 14px;
            border-radius: var(--radius-md);
        }

        .btn:focus-visible {
            outline: 2px solid var(--accent-bright);
            outline-offset: 2px;
        }

        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            height: 72px;
            background: rgba(250, 250, 247, 0.92);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
        }

        .site-header .container {
            height: 100%;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            gap: 24px;
        }

        .brand-logo {
            display: inline-flex;
            align-items: center;
            gap: 2px;
            flex-shrink: 0;
        }

        .logo-main {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            letter-spacing: 0.02em;
        }

        .logo-badge {
            font-size: 11px;
            font-weight: 500;
            background: #1C1917;
            color: #fff;
            padding: 2px 6px;
            border-radius: 4px;
            line-height: 1.3;
            margin-left: 2px;
            margin-top: -14px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
            margin-left: auto;
        }

        .main-nav a {
            font-size: 14px;
            color: var(--ink-sub);
            font-weight: 400;
            position: relative;
            padding: 6px 2px;
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--ink);
        }

        .main-nav a.active {
            color: var(--ink);
            font-weight: 500;
        }

        .main-nav a.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            background: var(--accent-bright);
            border-radius: 2px;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }

        .menu-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
            flex-direction: column;
            gap: 5px;
        }

        .menu-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: var(--transition);
        }

        .menu-toggle.open span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .menu-toggle.open span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.open span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .page-hero {
            background: linear-gradient(to bottom, rgba(250, 250, 247, 0.88), rgba(250, 250, 247, 0.97)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            padding: 140px 0 64px;
            border-bottom: 1px solid var(--line);
        }

        .breadcrumb {
            font-size: 13px;
            color: var(--ink-sub);
            margin-bottom: 16px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .breadcrumb a {
            color: var(--ink-sub);
        }

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

        .breadcrumb .sep {
            color: var(--line);
        }

        .page-hero h1 {
            font-size: clamp(34px, 4vw, 46px);
            line-height: 1.3;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 16px;
        }

        .page-hero .lead {
            font-size: 17px;
            color: var(--ink-sub);
            max-width: 660px;
            line-height: 1.8;
        }

        .guide-section {
            padding: 96px 0 48px;
        }

        .guide-layout {
            display: flex;
            gap: 48px;
            align-items: flex-start;
        }

        .guide-sidebar {
            flex: 0 0 260px;
            position: sticky;
            top: 112px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-soft);
        }

        .guide-sidebar-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 16px;
            letter-spacing: 0.02em;
        }

        .guide-sidebar ul {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .guide-sidebar ul a {
            display: block;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            font-size: 14px;
            color: var(--ink-sub);
            border-left: 2px solid transparent;
            transition: var(--transition);
        }

        .guide-sidebar ul a:hover {
            color: var(--primary);
            background: rgba(15, 118, 110, 0.04);
            border-left-color: var(--primary);
        }

        .guide-sidebar ul a.active {
            color: var(--primary);
            background: rgba(15, 118, 110, 0.06);
            border-left-color: var(--primary);
            font-weight: 500;
        }

        .guide-main {
            flex: 1;
            min-width: 0;
        }

        .guide-block {
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 40px;
            margin-bottom: 48px;
            box-shadow: var(--shadow-soft);
            transition: var(--transition);
        }

        .guide-block:hover {
            box-shadow: var(--shadow-hover);
        }

        .guide-block h2 {
            font-size: clamp(22px, 2vw, 28px);
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .guide-block .subtitle {
            font-size: 15px;
            color: var(--ink-sub);
            margin-bottom: 28px;
            line-height: 1.7;
        }

        .guide-block h3 {
            font-size: 17px;
            font-weight: 600;
            color: var(--ink);
            margin-top: 28px;
            margin-bottom: 12px;
            line-height: 1.5;
        }

        .guide-block p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--ink-sub);
            margin-bottom: 16px;
        }

        .guide-block ul {
            list-style: none;
            margin-bottom: 16px;
        }

        .guide-block ul li {
            position: relative;
            padding-left: 20px;
            font-size: 15px;
            line-height: 1.8;
            color: var(--ink-sub);
            margin-bottom: 8px;
        }

        .guide-block ul li::before {
            content: "";
            position: absolute;
            left: 0;
            top: 12px;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
        }

        .step-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
            margin: 24px 0;
        }

        .step-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
        }

        .step-num {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: rgba(15, 118, 110, 0.1);
            color: var(--primary);
            font-size: 14px;
            font-weight: 600;
            flex-shrink: 0;
            margin-top: 2px;
        }

        .step-body h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
        }

        .step-body p {
            font-size: 14px;
            color: var(--ink-sub);
            margin-bottom: 0;
            line-height: 1.7;
        }

        .guide-img {
            border-radius: 12px;
            overflow: hidden;
            margin: 28px 0 8px;
            border: 1px solid var(--line);
        }

        .guide-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .guide-img-caption {
            font-size: 13px;
            color: var(--ink-sub);
            text-align: center;
            padding: 12px;
            background: var(--bg-alt);
            border-radius: 0 0 12px 12px;
        }

        .tip-box {
            background: rgba(15, 118, 110, 0.04);
            border-left: 3px solid var(--primary);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            padding: 16px 20px;
            margin: 24px 0;
            font-size: 14px;
            line-height: 1.7;
            color: var(--ink-sub);
        }

        .tip-box strong {
            color: var(--primary);
            font-weight: 600;
        }

        .device-cards {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 24px 0 8px;
        }

        .device-card {
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 12px;
            padding: 24px 20px;
            text-align: center;
            transition: var(--transition);
        }

        .device-card:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-soft);
            transform: translateY(-2px);
        }

        .device-card i {
            font-size: 28px;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }

        .device-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }

        .device-card p {
            font-size: 13px;
            color: var(--ink-sub);
            margin-bottom: 0;
            line-height: 1.6;
        }

        .security-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin: 24px 0 8px;
        }

        .security-item {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            padding: 16px;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 12px;
        }

        .security-item i {
            font-size: 20px;
            color: var(--success);
            flex-shrink: 0;
            margin-top: 2px;
        }

        .security-item h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 4px;
        }

        .security-item p {
            font-size: 14px;
            color: var(--ink-sub);
            margin-bottom: 0;
        }

        .troubleshoot-item {
            display: flex;
            gap: 16px;
            align-items: center;
            padding: 16px 20px;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 12px;
            margin-bottom: 12px;
            transition: var(--transition);
        }

        .troubleshoot-item:hover {
            border-color: var(--primary);
        }

        .troubleshoot-item i {
            font-size: 18px;
            color: var(--accent);
            flex-shrink: 0;
        }

        .troubleshoot-item h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 2px;
        }

        .troubleshoot-item p {
            font-size: 13px;
            color: var(--ink-sub);
            margin-bottom: 0;
        }

        .support-channels {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 24px 0 8px;
        }

        .support-channel {
            text-align: center;
            padding: 28px 20px;
            background: var(--bg);
            border: 1px solid var(--line);
            border-radius: 12px;
            transition: var(--transition);
        }

        .support-channel:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-soft);
            border-color: var(--primary);
        }

        .support-channel i {
            font-size: 26px;
            color: var(--primary);
            margin-bottom: 12px;
            display: block;
        }

        .support-channel h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }

        .support-channel p {
            font-size: 13px;
            color: var(--ink-sub);
            margin-bottom: 0;
            line-height: 1.6;
        }

        .faq-section {
            padding: 96px 0 64px;
            background: var(--bg-alt);
        }

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }

        .section-header .tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 500;
            color: var(--primary);
            background: rgba(15, 118, 110, 0.08);
            border-radius: 6px;
            padding: 4px 14px;
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        .section-header h2 {
            font-size: clamp(26px, 3vw, 38px);
            font-weight: 600;
            color: var(--ink);
            line-height: 1.4;
            margin-bottom: 12px;
        }

        .section-header p {
            font-size: 16px;
            color: var(--ink-sub);
            max-width: 560px;
            margin: 0 auto;
        }

        .faq-wrap {
            max-width: 800px;
            margin: 0 auto;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            padding: 16px 32px;
            box-shadow: var(--shadow-soft);
        }

        .accordion {
            background: transparent;
        }

        .accordion-item {
            border-bottom: 1px solid var(--line);
        }

        .accordion-item:last-child {
            border-bottom: none;
        }

        .accordion-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--ink);
            line-height: 54px;
            position: relative;
            display: block;
            padding: 0 40px 0 0;
            transition: var(--transition);
        }

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

        .accordion-title::before,
        .accordion-title::after {
            content: "";
            position: absolute;
            right: 4px;
            top: 50%;
            width: 14px;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: var(--transition);
        }

        .accordion-title::after {
            transform: rotate(90deg);
        }

        .accordion-item.is-active .accordion-title::after {
            transform: rotate(0deg);
        }

        .accordion-content {
            padding: 0 24px 24px;
            color: var(--ink-sub);
            font-size: 14px;
            line-height: 1.8;
        }

        .faq-wrap .accordion-item {
            background: transparent;
        }

        .cta-section {
            padding: 96px 0;
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            text-align: center;
        }

        .cta-inner {
            max-width: 680px;
            margin: 0 auto;
        }

        .cta-section h2 {
            font-size: clamp(26px, 3vw, 38px);
            font-weight: 600;
            color: #fff;
            line-height: 1.4;
            margin-bottom: 16px;
        }

        .cta-section p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 32px;
            line-height: 1.8;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

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

        .cta-buttons .btn-white:hover {
            background: rgba(255, 255, 255, 0.9);
            transform: translateY(-2px);
            box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
        }

        .cta-buttons .btn-ghost {
            background: transparent;
            color: #fff;
            border-color: rgba(255, 255, 255, 0.5);
        }

        .cta-buttons .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            transform: translateY(-2px);
        }

        .site-footer {
            background: #1C1917;
            color: #A8A29E;
            padding: 64px 0 0;
        }

        .footer-grid {
            display: flex;
            justify-content: space-between;
            gap: 48px;
            padding-bottom: 40px;
            flex-wrap: wrap;
        }

        .footer-brand {
            max-width: 320px;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 4px;
            margin-bottom: 16px;
        }

        .footer-logo .logo-main {
            font-size: 20px;
            font-weight: 600;
            color: #fff;
            letter-spacing: 0.02em;
        }

        .footer-logo .logo-badge {
            font-size: 11px;
            background: #fff;
            color: #1C1917;
            padding: 2px 6px;
            border-radius: 4px;
            margin-top: -12px;
            font-weight: 500;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: #A8A29E;
            margin-bottom: 0;
        }

        .footer-links {
            display: flex;
            gap: 48px;
            flex-wrap: wrap;
        }

        .footer-link-group h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.04em;
        }

        .footer-link-group a {
            display: block;
            font-size: 14px;
            color: #A8A29E;
            padding: 4px 0;
            line-height: 1.6;
        }

        .footer-link-group a:hover {
            color: #fff;
        }

        .footer-bottom {
            border-top: 1px solid #3F3B38;
            padding: 20px 0;
            text-align: center;
        }

        .footer-bottom p {
            font-size: 13px;
            color: #A8A29E;
            margin-bottom: 0;
        }

        .floating-cta {
            position: fixed;
            bottom: 32px;
            right: 32px;
            z-index: 90;
            background: var(--primary);
            color: #fff;
            padding: 14px 24px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 500;
            border: none;
            cursor: pointer;
            box-shadow: 0 8px 24px rgba(15, 118, 110, 0.35);
            opacity: 0;
            visibility: hidden;
            transform: translateY(12px);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .floating-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 16px 36px rgba(15, 118, 110, 0.4);
            color: #fff;
        }

        .floating-cta.show {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .back-to-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--ink);
            color: #fff;
            border: none;
            cursor: pointer;
            display: none;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-hover);
            z-index: 89;
            transition: var(--transition);
        }

        .back-to-top.show {
            display: flex;
        }

        .back-to-top:hover {
            background: var(--primary);
        }

        @media (max-width: 1023px) {
            .guide-layout {
                flex-direction: column;
                gap: 32px;
            }

            .guide-sidebar {
                position: static;
                flex: none;
                width: 100%;
                overflow-x: auto;
            }

            .guide-sidebar ul {
                flex-direction: row;
                gap: 8px;
                overflow-x: auto;
                padding-bottom: 8px;
            }

            .guide-sidebar ul a {
                border-left: none;
                border-bottom: 2px solid transparent;
                white-space: nowrap;
                padding: 8px 14px;
            }

            .guide-sidebar ul a:hover,
            .guide-sidebar ul a.active {
                border-left-color: transparent;
                border-bottom-color: var(--primary);
                background: rgba(15, 118, 110, 0.04);
            }

            .device-cards,
            .support-channels {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 767px) {
            .site-header {
                height: 64px;
            }

            .main-nav {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--bg);
                flex-direction: column;
                align-items: stretch;
                gap: 0;
                padding: 0 24px 24px;
                box-shadow: 0 16px 24px rgba(28, 25, 23, 0.08);
                border-bottom: 1px solid var(--line);
                display: none;
            }

            .main-nav.open {
                display: flex;
            }

            .main-nav a {
                line-height: 64px;
                border-bottom: 1px solid var(--line);
                font-size: 15px;
            }

            .main-nav a.active {
                border-bottom: none;
            }

            .main-nav a.active::after {
                display: none;
            }

            .main-nav a.active {
                color: var(--primary);
                font-weight: 500;
            }

            .header-right .btn {
                display: none;
            }

            .menu-toggle {
                display: flex;
            }

            .page-hero {
                padding: 120px 0 48px;
            }

            .guide-section {
                padding: 64px 0 32px;
            }

            .guide-block {
                padding: 24px;
                margin-bottom: 32px;
            }

            .device-cards,
            .support-channels {
                grid-template-columns: 1fr;
            }

            .faq-section {
                padding: 64px 0 48px;
            }

            .faq-wrap {
                padding: 8px 16px;
            }

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

            .cta-buttons .btn {
                width: 100%;
            }

            .footer-grid {
                flex-direction: column;
                gap: 32px;
            }

            .footer-links {
                gap: 24px;
                flex-direction: column;
            }

            .floating-cta {
                bottom: 20px;
                right: 20px;
                width: 56px;
                height: 56px;
                padding: 0;
                border-radius: 50%;
                justify-content: center;
                font-size: 13px;
            }

            .floating-cta span {
                display: none;
            }

            .floating-cta i {
                font-size: 20px;
            }

            .back-to-top {
                bottom: 88px;
                right: 20px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-hero h1 {
                font-size: 30px;
            }

            .guide-block {
                padding: 20px;
            }

            .step-item {
                gap: 12px;
            }

            .security-item {
                flex-direction: column;
                gap: 8px;
                padding: 14px;
            }

            .troubleshoot-item {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
                padding: 14px;
            }
        }

/* roulang page: category2 */
:root {
    --primary: #0F766E;
    --primary-dark: #0D5953;
    --accent: #B45309;
    --accent-bright: #F59E0B;
    --bg: #FAFAF7;
    --bg-alt: #F3F1EC;
    --bg-deep: #EFECE6;
    --ink: #1C1917;
    --ink-sub: #57534E;
    --line: #E7E0D9;
    --success: #059669;
    --radius-lg: 16px;
    --radius-md: 10px;
    --radius-sm: 6px;
    --shadow-soft: 0 8px 24px rgba(28,25,23,0.06);
    --shadow-hover: 0 16px 36px rgba(28,25,23,0.10);
    --transition: all 0.3s ease;
    --container-max: 1200px;
}
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, "Inter", sans-serif;
    background: var(--bg);
    color: var(--ink);
    font-size: 16px;
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul, ol { list-style: none; }
button, input { font-family: inherit; outline: none; }
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}
.main-nav-wrap {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(250, 250, 247, 0.92);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
    height: 72px;
}
.main-nav-wrap .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.brand-logo {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}
.brand-logo .logo-main {
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.02em;
    color: var(--ink);
    line-height: 1.2;
}
.brand-logo .logo-badge {
    font-size: 11px;
    background: #1C1917;
    color: #fff;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 500;
    line-height: 1.4;
    letter-spacing: 0.02em;
}
.main-nav {
    display: flex;
    align-items: center;
    gap: 40px;
}
.main-nav a {
    font-size: 14px;
    color: var(--ink-sub);
    line-height: 72px;
    position: relative;
    white-space: nowrap;
}
.main-nav a:hover {
    color: var(--ink);
}
.main-nav a.active {
    color: var(--ink);
}
.main-nav a.active::after {
    content: '';
    position: absolute;
    bottom: 18px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}
.header-actions {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-left: 24px;
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: #fff;
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    border: 1px solid var(--primary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
}
.btn-primary:hover {
    background: var(--primary-dark);
    border-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    color: #fff;
}
.btn-outline {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--primary);
    padding: 12px 28px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    border: 1px solid var(--primary);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
}
.btn-outline:hover {
    background: rgba(15, 118, 110, 0.08);
    color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-soft);
}
.btn:focus-visible, a:focus-visible {
    outline: 2px solid var(--accent-bright);
    outline-offset: 2px;
}
.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1100;
}
.hamburger-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--ink);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg);
    z-index: 1050;
    padding: 88px 24px 40px;
    flex-direction: column;
    overflow-y: auto;
}
.mobile-menu.open {
    display: flex;
}
.mobile-menu a {
    font-size: 17px;
    color: var(--ink);
    line-height: 64px;
    border-bottom: 1px solid var(--line);
    font-weight: 500;
}
.mobile-menu a.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}
.mobile-menu .menu-cta {
    margin-top: 32px;
    width: 100%;
    text-align: center;
}
.section {
    padding: 96px 0;
}
.page-hero {
    padding: 150px 0 80px;
    background: var(--bg-alt);
    position: relative;
    border-bottom: 1px solid var(--line);
}
.page-hero .container {
    position: relative;
    z-index: 2;
}
.page-hero-inner {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
}
.page-hero h1 {
    font-size: clamp(32px, 4vw, 44px);
    line-height: 1.3;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 16px;
}
.page-hero .hero-desc {
    max-width: 560px;
    font-size: 17px;
    line-height: 1.8;
    color: var(--ink-sub);
}
.breadcrumb-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--ink-sub);
    margin-bottom: 24px;
}
.breadcrumb-nav a {
    color: var(--ink-sub);
}
.breadcrumb-nav a:hover {
    color: var(--primary);
}
.breadcrumb-nav i {
    font-size: 10px;
    color: #A8A29E;
}
.card-masonry {
    column-count: 3;
    column-gap: 24px;
    margin-top: 56px;
}
.masonry-card {
    break-inside: avoid;
    margin-bottom: 24px;
    background: #FFFFFF;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    overflow: hidden;
    padding: 0;
    transition: var(--transition);
    display: inline-block;
    width: 100%;
}
.masonry-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}
.masonry-card .card-img-wrap {
    position: relative;
    overflow: hidden;
    background: var(--bg-alt);
    padding-top: 56%;
}
.masonry-card .card-img-wrap img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.masonry-card:hover .card-img-wrap img {
    transform: scale(1.04);
}
.masonry-card .card-content {
    padding: 24px 24px 28px;
}
.masonry-card .card-tag {
    display: inline-block;
    font-size: 12px;
    color: var(--primary);
    background: rgba(15, 118, 110, 0.08);
    border-radius: var(--radius-sm);
    padding: 3px 10px;
    font-weight: 500;
    margin-bottom: 12px;
    letter-spacing: 0.02em;
}
.masonry-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--ink);
    line-height: 1.5;
    margin-bottom: 8px;
}
.masonry-card .card-desc {
    font-size: 14px;
    line-height: 1.8;
    color: var(--ink-sub);
    margin-bottom: 16px;
}
.masonry-card .card-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.masonry-card .card-link i {
    transition: transform 0.3s ease;
    font-size: 12px;
}
.masonry-card .card-link:hover i {
    transform: translateX(4px);
}
.masonry-card.tall .card-img-wrap {
    padding-top: 72%;
}
.masonry-card.short .card-img-wrap {
    padding-top: 42%;
}
.masonry-card.medium .card-img-wrap {
    padding-top: 56%;
}
.process-section {
    background: var(--bg-alt);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.section-title {
    font-size: clamp(26px, 3vw, 38px);
    font-weight: 600;
    color: var(--ink);
    line-height: 1.4;
    margin-bottom: 12px;
}
.section-subtitle {
    font-size: 16px;
    color: var(--ink-sub);
    max-width: 640px;
    line-height: 1.8;
    margin-bottom: 56px;
}
.process-grid {
    display: flex;
    gap: 32px;
    flex-wrap: wrap;
}
.process-step {
    flex: 1;
    min-width: 210px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    position: relative;
    transition: var(--transition);
}
.process-step:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}
.process-num {
    font-size: 42px;
    font-weight: 700;
    color: rgba(15, 118, 110, 0.14);
    line-height: 1;
    margin-bottom: 20px;
    font-family: "Inter", sans-serif;
}
.process-step h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--ink);
}
.process-step p {
    font-size: 14px;
    color: var(--ink-sub);
    line-height: 1.8;
}
.step-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    background: rgba(15, 118, 110, 0.10);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--primary);
    font-size: 18px;
}
.promise-section {
    background: var(--bg);
}
.promise-grid {
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}
.promise-card {
    flex: 1;
    min-width: 220px;
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    background: #fff;
    border: 1px solid var(--line);
    text-align: center;
    transition: var(--transition);
}
.promise-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-soft);
    transform: translateY(-2px);
}
.promise-card .p-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(15, 118, 110, 0.10);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    color: var(--primary);
    font-size: 20px;
}
.promise-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--ink);
    margin-bottom: 8px;
}
.promise-card p {
    font-size: 14px;
    color: var(--ink-sub);
    line-height: 1.7;
}
.faq-section {
    background: var(--bg-alt);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}
.faq-list {
    max-width: 880px;
    margin: 0 auto;
}
.faq-item {
    border-bottom: 1px solid var(--line);
    background: transparent;
}
.faq-item:first-child {
    border-top: 1px solid var(--line);
}
.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    background: none;
    border: none;
    padding: 20px 0;
    font-size: 15px;
    font-weight: 600;
    color: var(--ink);
    cursor: pointer;
    text-align: left;
    line-height: 1.5;
}
.faq-question span {
    flex: 1;
    padding-right: 16px;
}
.faq-icon {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    font-size: 22px;
    font-weight: 300;
    transition: transform 0.3s ease;
    line-height: 1;
}
.faq-item.active .faq-icon {
    transform: rotate(45deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}
.faq-answer-inner {
    padding: 0 36px 24px 0;
    font-size: 15px;
    color: var(--ink-sub);
    line-height: 1.8;
}
.faq-item.active .faq-answer {
    max-height: 300px;
}
.cta-section {
    background: var(--primary);
    padding: 80px 0;
    position: relative;
    overflow: hidden;
}
.cta-section::before {
    content: '';
    position: absolute;
    top: -40%;
    right: -20%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}
.cta-section .container {
    position: relative;
    z-index: 2;
    text-align: center;
}
.cta-section h2 {
    font-size: clamp(28px, 3.4vw, 40px);
    color: #ffffff;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 16px;
}
.cta-section p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.8);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.8;
}
.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}
.btn-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #ffffff;
    color: var(--primary);
    padding: 14px 36px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    border: 1px solid #ffffff;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
}
.btn-white:hover {
    background: rgba(255, 255, 255, 0.88);
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
    color: var(--primary-dark);
}
.btn-ghost-white {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: #ffffff;
    padding: 14px 36px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    border: 1px solid rgba(255, 255, 255, 0.6);
    cursor: pointer;
    transition: var(--transition);
    line-height: 1.4;
}
.btn-ghost-white:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: #ffffff;
    transform: translateY(-2px);
}
.site-footer {
    background: #1C1917;
    padding: 64px 0 32px;
}
.footer-grid {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}
.footer-brand {
    max-width: 340px;
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
}
.footer-logo .logo-main {
    color: #fff;
    font-size: 20px;
    font-weight: 600;
    letter-spacing: 0.02em;
}
.footer-logo .logo-badge {
    background: #F59E0B;
    color: #1C1917;
    font-size: 11px;
    padding: 3px 8px;
    border-radius: 4px;
    font-weight: 600;
    line-height: 1.4;
}
.footer-brand p {
    color: #A8A29E;
    font-size: 14px;
    line-height: 1.8;
}
.footer-links {
    display: flex;
    gap: 64px;
    flex-wrap: wrap;
}
.footer-link-group h4 {
    color: #ffffff;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}
.footer-link-group a {
    display: block;
    color: #A8A29E;
    font-size: 14px;
    line-height: 2.4;
    transition: var(--transition);
}
.footer-link-group a:hover {
    color: #F59E0B;
}
.footer-bottom {
    border-top: 1px solid #3F3B38;
    padding-top: 24px;
    text-align: center;
}
.footer-bottom p {
    color: #A8A29E;
    font-size: 14px;
}
.floating-cta {
    position: fixed;
    bottom: 32px;
    right: 32px;
    z-index: 900;
    background: var(--primary);
    color: #ffffff;
    border-radius: 50px;
    padding: 14px 32px;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 12px 40px rgba(15, 118, 110, 0.35);
    font-size: 14px;
    font-weight: 500;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s ease;
    border: none;
    cursor: pointer;
    line-height: 1.4;
}
.floating-cta.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.floating-cta:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    color: #fff;
}
.floating-cta i {
    font-size: 14px;
}
@media (max-width: 1023.98px) {
    .main-nav, .header-actions .btn-primary {
        display: none;
    }
    .hamburger-btn {
        display: block;
    }
    .hero-section, .page-hero {
        padding-top: 120px;
    }
    .card-masonry {
        column-count: 2;
    }
}
@media (max-width: 767.98px) {
    .section {
        padding: 64px 0;
    }
    .page-hero {
        padding: 120px 0 48px;
    }
    .card-masonry {
        column-count: 1;
        gap: 16px;
    }
    .masonry-card {
        margin-bottom: 16px;
    }
    .process-grid, .promise-grid {
        flex-direction: column;
        gap: 16px;
    }
    .footer-grid {
        flex-direction: column;
        gap: 32px;
    }
    .footer-links {
        gap: 32px;
        flex-direction: column;
    }
    .floating-cta {
        bottom: 20px;
        right: 20px;
        width: 56px;
        height: 56px;
        border-radius: 50%;
        padding: 0;
        justify-content: center;
    }
    .floating-cta span {
        display: none;
    }
    .floating-cta i {
        font-size: 18px;
    }
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
    .btn-white, .btn-ghost-white {
        width: 100%;
        max-width: 260px;
    }
}
@media (max-width: 520px) {
    .container {
        padding: 0 16px;
    }
    .main-nav-wrap .container {
        height: 64px;
    }
    .brand-logo .logo-main {
        font-size: 18px;
    }
    .brand-logo .logo-badge {
        font-size: 10px;
        padding: 2px 6px;
    }
    .page-hero {
        padding: 112px 0 40px;
    }
    .page-hero h1 {
        font-size: 30px;
    }
    .page-hero .hero-desc {
        font-size: 15px;
    }
    .breadcrumb-nav {
        font-size: 12px;
        margin-bottom: 16px;
    }
    .masonry-card .card-content {
        padding: 20px;
    }
    .masonry-card h3 {
        font-size: 18px;
    }
    .section-title {
        font-size: 26px;
    }
    .section-subtitle {
        font-size: 15px;
        margin-bottom: 40px;
    }
}

/* roulang page: article */
:root {
            --primary: #0F766E;
            --primary-dark: #0D5953;
            --accent: #B45309;
            --accent-bright: #F59E0B;
            --bg: #FAFAF7;
            --bg-alt: #F3F1EC;
            --bg-deep: #EFECE6;
            --ink: #1C1917;
            --ink-sub: #57534E;
            --line: #E7E0D9;
            --success: #059669;
            --radius-lg: 16px;
            --radius-md: 10px;
            --radius-sm: 6px;
            --shadow-soft: 0 8px 24px rgba(28,25,23,0.06);
            --shadow-hover: 0 16px 36px rgba(28,25,23,0.10);
            --transition: all 0.3s ease;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
            font-size: 16px;
            line-height: 1.8;
            color: var(--ink);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
        }

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

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

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

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

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

        .row {
            max-width: var(--container-max);
        }

        .btn {
            display: inline-block;
            padding: 14px 32px;
            border-radius: var(--radius-md);
            font-size: 15px;
            font-weight: 500;
            line-height: 1.4;
            border: 1px solid transparent;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            vertical-align: middle;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-soft);
        }

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

        .btn-outline:hover {
            background: rgba(15, 118, 110, 0.08);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 10px 24px;
            font-size: 14px;
        }

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

        .btn-white:hover {
            background: var(--bg);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }

        .btn:focus-visible {
            outline: 2px solid var(--accent-bright);
            outline-offset: 2px;
        }

        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 72px;
            background: rgba(250, 250, 247, 0.92);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--line);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        .site-logo {
            flex-shrink: 0;
        }

        .site-logo-link {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            text-decoration: none;
        }

        .logo-main {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            letter-spacing: 0.01em;
            line-height: 1.2;
        }

        .logo-badge {
            font-size: 10px;
            font-weight: 500;
            color: #fff;
            background: var(--ink);
            border-radius: 4px;
            padding: 2px 6px;
            line-height: 1.4;
            letter-spacing: 0.01em;
            position: relative;
            top: -6px;
            white-space: nowrap;
        }

        .header-right {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 32px;
        }

        .main-nav a {
            font-size: 14px;
            color: var(--ink-sub);
            line-height: 72px;
            position: relative;
            transition: color 0.3s ease;
            letter-spacing: 0.01em;
            white-space: nowrap;
        }

        .main-nav a:hover {
            color: var(--ink);
        }

        .main-nav a.active {
            color: var(--ink);
            font-weight: 500;
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 2px;
            background: var(--accent);
            border-radius: 2px 2px 0 0;
        }

        .header-cta {
            flex-shrink: 0;
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            gap: 5px;
            width: 44px;
            height: 44px;
            background: transparent;
            border: none;
            cursor: pointer;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }

        .menu-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--ink);
            border-radius: 2px;
            transition: transform 0.3s ease, opacity 0.3s ease;
        }

        .menu-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .menu-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .menu-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        .mobile-menu {
            display: none;
            position: fixed;
            top: 72px;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: 999;
            background: rgba(250, 250, 247, 0.98);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            padding: 24px 20px 40px;
            overflow-y: auto;
        }

        .mobile-menu.show {
            display: block;
        }

        .mobile-nav a {
            display: block;
            font-size: 18px;
            font-weight: 400;
            color: var(--ink);
            line-height: 64px;
            border-bottom: 1px solid var(--line);
            transition: var(--transition);
        }

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

        .mobile-nav a.active {
            color: var(--primary);
            font-weight: 600;
            border-bottom-color: var(--primary);
        }

        .main-content {
            min-height: 62vh;
        }

        .article-page {
            padding-bottom: 0;
        }

        .breadcrumb {
            padding: 32px 0 4px;
            font-size: 14px;
            color: var(--ink-sub);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0;
        }

        .breadcrumb a {
            color: var(--ink-sub);
            transition: var(--transition);
        }

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

        .breadcrumb-sep {
            margin: 0 10px;
            color: #a8a29e;
            font-size: 13px;
        }

        .breadcrumb-current {
            color: var(--ink);
            max-width: 320px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .article-wrap {
            max-width: 880px;
            margin: 0 auto;
        }

        .article-header {
            padding: 40px 0 32px;
        }

        .article-title {
            font-size: clamp(28px, 4vw, 40px);
            font-weight: 600;
            line-height: 1.35;
            margin-bottom: 20px;
            color: var(--ink);
            word-break: break-word;
            letter-spacing: 0.01em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 28px;
            font-size: 14px;
            color: var(--ink-sub);
            padding-bottom: 20px;
            border-bottom: 1px solid var(--line);
        }

        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .article-meta i {
            color: var(--accent);
            font-size: 14px;
        }

        .article-body {
            max-width: 760px;
            margin: 0 auto;
            font-size: 16px;
            line-height: 1.9;
            color: #292524;
            padding-top: 8px;
        }

        .article-body h2 {
            font-size: 24px;
            font-weight: 600;
            color: var(--ink);
            margin: 48px 0 20px;
            line-height: 1.4;
            letter-spacing: 0.01em;
        }

        .article-body h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            margin: 32px 0 16px;
            line-height: 1.5;
        }

        .article-body p {
            margin-bottom: 24px;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 24px 24px;
        }

        .article-body li {
            margin-bottom: 8px;
        }

        .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--bg-alt);
            padding: 16px 24px;
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            margin: 24px 0;
            color: var(--ink-sub);
        }

        .article-body img {
            border-radius: var(--radius-lg);
            margin: 24px 0;
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .article-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body a:hover {
            color: var(--primary-dark);
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 15px;
        }

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

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

        .article-tags {
            max-width: 760px;
            margin: 40px auto 0;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
            border-top: 1px solid var(--line);
            padding-top: 28px;
        }

        .tag {
            display: inline-block;
            background: var(--bg-alt);
            color: var(--ink-sub);
            font-size: 13px;
            border-radius: var(--radius-sm);
            padding: 6px 14px;
            transition: var(--transition);
        }

        .tag:hover {
            background: rgba(15, 118, 110, 0.1);
            color: var(--primary);
        }

        .tag-label {
            font-size: 14px;
            color: var(--ink-sub);
            margin-right: 4px;
            font-weight: 500;
        }

        .article-not-found {
            max-width: 760px;
            margin: 64px auto;
            text-align: center;
            padding: 64px 40px;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-soft);
        }

        .article-not-found i {
            font-size: 48px;
            color: #d6cec5;
            margin-bottom: 20px;
            display: block;
        }

        .article-not-found h1 {
            font-size: 28px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 12px;
        }

        .article-not-found p {
            color: var(--ink-sub);
            margin-bottom: 32px;
        }

        .related-section {
            background: var(--bg-alt);
            padding: 64px 0;
            margin-top: 64px;
        }

        .related-section .row {
            max-width: var(--container-max);
            margin: 0 auto;
        }

        .section-title {
            font-size: clamp(24px, 3vw, 32px);
            font-weight: 600;
            text-align: center;
            margin-bottom: 40px;
            color: var(--ink);
            letter-spacing: 0.01em;
        }

        .related-col {
            margin-bottom: 24px;
        }

        .related-card {
            display: block;
            background: #fff;
            border: 1px solid var(--line);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-soft);
            transition: var(--transition);
            height: 100%;
        }

        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: var(--primary);
        }

        .related-offset {
            transform: translateY(16px);
        }

        .related-offset:hover {
            transform: translateY(12px);
        }

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            display: block;
        }

        .related-card-body {
            padding: 24px;
        }

        .related-card-body h3 {
            font-size: 17px;
            font-weight: 600;
            line-height: 1.5;
            margin-bottom: 10px;
            color: var(--ink);
        }

        .related-card-body p {
            font-size: 14px;
            color: var(--ink-sub);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .related-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-actions {
            text-align: center;
            margin-top: 48px;
        }

        .article-cta {
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            padding: 72px 0;
            margin-top: 0;
            text-align: center;
        }

        .article-cta h2 {
            color: #fff;
            font-size: clamp(24px, 3vw, 34px);
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.01em;
        }

        .article-cta p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            margin-bottom: 36px;
        }

        .site-footer {
            background: var(--ink);
            color: #a8a29e;
            padding: 56px 0 24px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1fr 2fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid #3f3b38;
        }

        .footer-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 16px;
        }

        .footer-logo .logo-main {
            color: #fff;
            font-size: 20px;
            font-weight: 600;
            letter-spacing: 0.01em;
        }

        .footer-logo .logo-badge {
            background: #fff;
            color: var(--ink);
            font-size: 10px;
            font-weight: 500;
            padding: 2px 6px;
            border-radius: 4px;
            letter-spacing: 0.01em;
        }

        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: #a8a29e;
            max-width: 340px;
        }

        .footer-links {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .footer-link-group h4 {
            color: #fff;
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .footer-link-group a {
            display: block;
            color: #a8a29e;
            font-size: 14px;
            margin-bottom: 10px;
            line-height: 1.6;
            transition: var(--transition);
        }

        .footer-link-group a:hover {
            color: #fff;
        }

        .footer-bottom {
            padding-top: 24px;
            text-align: center;
            font-size: 14px;
            color: #78716c;
        }

        @media (max-width: 1023px) {
            .main-nav {
                display: none;
            }

            .header-cta {
                display: none;
            }

            .header-right {
                gap: 16px;
            }

            .menu-toggle {
                display: flex;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
        }

        @media (max-width: 767px) {
            body {
                font-size: 15px;
            }

            .container {
                padding: 0 20px;
            }

            .header-inner {
                padding: 0 16px;
            }

            .breadcrumb {
                padding-top: 20px;
            }

            .article-header {
                padding: 28px 0 24px;
            }

            .article-title {
                font-size: 26px;
                line-height: 1.4;
            }

            .article-meta {
                gap: 8px 16px;
                font-size: 13px;
            }

            .article-body {
                font-size: 15px;
                line-height: 1.85;
            }

            .article-body h2 {
                font-size: 22px;
                margin-top: 36px;
            }

            .article-body h3 {
                font-size: 19px;
                margin-top: 28px;
            }

            .related-section {
                padding: 48px 0;
            }

            .related-offset {
                transform: none;
            }

            .related-offset:hover {
                transform: translateY(-4px);
            }

            .related-col {
                margin-bottom: 20px;
            }

            .article-cta {
                padding: 56px 20px;
            }

            .footer-links {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer-grid {
                gap: 32px;
            }
        }

        @media (max-width: 520px) {
            .logo-main {
                font-size: 18px;
            }

            .logo-badge {
                font-size: 9px;
                padding: 2px 5px;
            }

            .breadcrumb-current {
                max-width: 200px;
            }

            .article-meta {
                flex-direction: column;
                gap: 6px;
            }

            .article-title {
                font-size: 24px;
            }

            .related-card img {
                height: 160px;
            }
        }