/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #FF6B35;
            --color-primary-light: #FF8A5C;
            --color-secondary: #FFD23F;
            --color-accent: #06D6A0;
            --color-dark: #2B2D42;
            --color-dark-light: #3D405B;
            --color-bg: #F7F7F9;
            --color-white: #FFFFFF;
            --color-text: #333333;
            --color-text-light: #666666;
            --color-text-lighter: #999999;
            --color-border: #E8E8EC;
            --font-cn: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --font-en: "Inter", "Helvetica", sans-serif;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-input: 8px;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.14);
            --shadow-nav: 0 2px 16px rgba(0,0,0,0.06);
            --transition: all 0.3s ease;
            --max-width: 1200px;
            --header-height: 72px;
            --space-section: 80px;
            --space-section-mobile: 40px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-cn);
            color: var(--color-text);
            background: var(--color-bg);
            line-height: 1.6;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--color-primary); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.3; color: var(--color-dark); }
        p { margin-bottom: 1rem; }

        /* ===== Container ===== */
        .container-custom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media screen and (max-width: 40em) {
            .container-custom { padding: 0 16px; }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: var(--color-white);
            box-shadow: var(--shadow-nav);
            z-index: 1000;
            display: flex;
            align-items: center;
        }
        .site-header .container-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .header-left {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-white);
            font-size: 22px;
            font-weight: 800;
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 24px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: 1px;
            white-space: nowrap;
        }
        .header-center {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--color-dark);
            padding: 6px 0;
            position: relative;
            transition: var(--transition);
        }
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--color-primary);
            transition: var(--transition);
            border-radius: 2px;
        }
        .nav-link:hover { color: var(--color-primary); }
        .nav-link:hover::after { width: 100%; }
        .nav-link.active { color: var(--color-primary); }
        .nav-link.active::after { width: 100%; }
        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .badge-hot {
            background: #FF3B30;
            color: var(--color-white);
            font-size: 11px;
            font-weight: 700;
            padding: 2px 10px;
            border-radius: 20px;
            margin-left: 4px;
            vertical-align: super;
            display: inline-block;
            line-height: 1.4;
        }
        .btn-nav-cta {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: var(--color-white);
            padding: 10px 28px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            box-shadow: 0 4px 14px rgba(255,107,53,0.3);
            white-space: nowrap;
        }
        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255,107,53,0.4);
            color: var(--color-white);
        }
        .hamburger {
            display: none;
            font-size: 28px;
            color: var(--color-dark);
            cursor: pointer;
            padding: 4px;
            background: none;
            border: none;
        }
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            height: calc(100vh - var(--header-height));
            background: rgba(0,0,0,0.4);
            z-index: 999;
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        .mobile-menu-overlay.open { display: block; opacity: 1; }
        .mobile-menu-panel {
            position: fixed;
            top: var(--header-height);
            left: 0;
            width: 100%;
            background: var(--color-white);
            padding: 24px 20px;
            z-index: 1000;
            transform: translateY(-20px);
            opacity: 0;
            transition: var(--transition);
            pointer-events: none;
            box-shadow: 0 8px 30px rgba(0,0,0,0.1);
            border-top: 1px solid var(--color-border);
        }
        .mobile-menu-panel.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }
        .mobile-nav-link {
            display: block;
            font-size: 18px;
            font-weight: 500;
            color: var(--color-dark);
            padding: 14px 0;
            border-bottom: 1px solid var(--color-border);
        }
        .mobile-nav-link.active { color: var(--color-primary); }
        .mobile-nav-link:last-child { border-bottom: none; }
        .mobile-cta {
            margin-top: 20px;
            display: block;
            text-align: center;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: var(--color-white);
            padding: 14px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 17px;
        }

        @media screen and (max-width: 64em) {
            .header-center { display: none; }
            .header-right .btn-nav-cta { display: none; }
            .hamburger { display: block; }
        }
        @media screen and (min-width: 64.0625em) {
            .hamburger { display: none; }
            .header-center { display: flex; }
            .header-right .btn-nav-cta { display: inline-block; }
        }

        /* ===== Hero ===== */
        .hero-section {
            margin-top: var(--header-height);
            min-height: 92vh;
            display: flex;
            align-items: center;
            position: relative;
            background: linear-gradient(135deg, var(--color-primary) 0%, #FF8A5C 40%, var(--color-secondary) 100%);
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to right, rgba(43,45,66,0.7) 0%, rgba(43,45,66,0.3) 70%, transparent 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 60px 0;
        }
        .hero-text {
            max-width: 640px;
        }
        .hero-badge {
            display: inline-block;
            background: rgba(255,255,255,0.2);
            backdrop-filter: blur(6px);
            color: var(--color-white);
            padding: 6px 20px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 500;
            margin-bottom: 24px;
            border: 1px solid rgba(255,255,255,0.25);
        }
        .hero-title {
            font-size: 52px;
            font-weight: 800;
            color: var(--color-white);
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-title span {
            background: linear-gradient(to right, var(--color-secondary), #FFE066);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-subtitle {
            font-size: 20px;
            color: rgba(255,255,255,0.9);
            line-height: 1.7;
            margin-bottom: 36px;
            max-width: 520px;
        }
        .hero-actions {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
        }
        .btn-hero-primary {
            background: var(--color-white);
            color: var(--color-primary);
            padding: 16px 40px;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 18px;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
        }
        .btn-hero-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.2);
            color: var(--color-primary);
        }
        .btn-hero-secondary {
            color: var(--color-white);
            padding: 16px 32px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 17px;
            border: 2px solid rgba(255,255,255,0.5);
            transition: var(--transition);
        }
        .btn-hero-secondary:hover {
            background: rgba(255,255,255,0.15);
            border-color: var(--color-white);
            color: var(--color-white);
        }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            flex-wrap: wrap;
        }
        .hero-stat-item {
            color: var(--color-white);
        }
        .hero-stat-number {
            font-size: 32px;
            font-weight: 800;
            line-height: 1.2;
        }
        .hero-stat-label {
            font-size: 14px;
            opacity: 0.8;
            margin-top: 2px;
        }

        @media screen and (max-width: 64em) {
            .hero-title { font-size: 38px; }
            .hero-subtitle { font-size: 18px; }
            .hero-stats { gap: 24px; }
            .hero-stat-number { font-size: 26px; }
        }
        @media screen and (max-width: 40em) {
            .hero-section { min-height: 80vh; }
            .hero-title { font-size: 30px; }
            .hero-subtitle { font-size: 16px; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .btn-hero-primary, .btn-hero-secondary { text-align: center; }
            .hero-stats { gap: 16px; justify-content: space-between; }
            .hero-stat-number { font-size: 22px; }
        }

        /* ===== Section通用 ===== */
        .section-block {
            padding: var(--space-section) 0;
        }
        .section-block-alt {
            padding: var(--space-section) 0;
            background: var(--color-white);
        }
        .section-title {
            font-size: 36px;
            font-weight: 800;
            color: var(--color-dark);
            margin-bottom: 12px;
            text-align: center;
        }
        .section-subtitle {
            font-size: 18px;
            color: var(--color-text-light);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px auto;
            line-height: 1.6;
        }
        @media screen and (max-width: 40em) {
            .section-block { padding: var(--space-section-mobile) 0; }
            .section-block-alt { padding: var(--space-section-mobile) 0; }
            .section-title { font-size: 28px; }
            .section-subtitle { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== 产品卡片 ===== */
        .product-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .product-card {
            background: var(--color-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .product-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-6px);
        }
        .product-img-wrap {
            width: 100%;
            aspect-ratio: 1 / 1;
            overflow: hidden;
            background: var(--color-bg);
        }
        .product-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .product-card:hover .product-img-wrap img {
            transform: scale(1.05);
        }
        .product-info {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .product-name {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-dark);
            margin-bottom: 6px;
        }
        .product-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 10px;
            font-size: 13px;
            color: var(--color-text-lighter);
        }
        .product-rating {
            color: #FFB800;
        }
        .product-price {
            font-size: 22px;
            font-weight: 800;
            color: var(--color-primary);
            margin-top: auto;
            margin-bottom: 12px;
        }
        .product-price small {
            font-size: 14px;
            font-weight: 400;
            color: var(--color-text-lighter);
            text-decoration: line-through;
            margin-left: 8px;
        }
        .btn-add-cart {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: var(--color-white);
            padding: 12px;
            border-radius: var(--radius-btn);
            font-weight: 600;
            font-size: 15px;
            transition: var(--transition);
            text-align: center;
        }
        .btn-add-cart:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(255,107,53,0.3);
            color: var(--color-white);
        }

        @media screen and (max-width: 64em) {
            .product-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media screen and (max-width: 40em) {
            .product-grid { grid-template-columns: 1fr; gap: 16px; }
        }

        /* ===== 评价轮播 ===== */
        .testimonials-wrapper {
            display: flex;
            gap: 24px;
            overflow-x: auto;
            padding: 8px 0 16px 0;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
        }
        .testimonials-wrapper::-webkit-scrollbar { height: 6px; }
        .testimonials-wrapper::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 10px; }
        .testimonial-card {
            flex: 0 0 320px;
            background: var(--color-white);
            border-radius: var(--radius-card);
            padding: 28px 24px;
            box-shadow: var(--shadow-card);
            scroll-snap-align: start;
            border: 1px solid var(--color-border);
            transition: var(--transition);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-card-hover);
        }
        .testimonial-header {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 16px;
        }
        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            object-fit: cover;
            background: var(--color-bg);
            flex-shrink: 0;
        }
        .testimonial-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-dark);
        }
        .testimonial-stars {
            color: #FFB800;
            font-size: 14px;
            margin-top: 2px;
        }
        .testimonial-text {
            font-size: 15px;
            line-height: 1.7;
            color: var(--color-text-light);
            font-style: italic;
        }
        .testimonial-date {
            font-size: 12px;
            color: var(--color-text-lighter);
            margin-top: 12px;
        }

        @media screen and (max-width: 40em) {
            .testimonial-card { flex: 0 0 280px; padding: 20px 16px; }
        }

        /* ===== 保障条 ===== */
        .assurance-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .assurance-item {
            text-align: center;
            padding: 32px 16px;
            background: var(--color-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            transition: var(--transition);
        }
        .assurance-item:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .assurance-icon {
            font-size: 36px;
            margin-bottom: 16px;
            color: var(--color-primary);
        }
        .assurance-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-dark);
            margin-bottom: 6px;
        }
        .assurance-desc {
            font-size: 14px;
            color: var(--color-text-light);
        }

        @media screen and (max-width: 64em) {
            .assurance-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media screen and (max-width: 40em) {
            .assurance-grid { grid-template-columns: 1fr; gap: 16px; }
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            border-radius: 24px;
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-content {
            position: relative;
            z-index: 2;
        }
        .cta-title {
            font-size: 38px;
            font-weight: 800;
            color: var(--color-white);
            margin-bottom: 12px;
        }
        .cta-desc {
            font-size: 18px;
            color: rgba(255,255,255,0.9);
            margin-bottom: 32px;
            max-width: 560px;
            margin-left: auto;
            margin-right: auto;
        }
        .btn-cta-big {
            background: var(--color-white);
            color: var(--color-primary);
            padding: 18px 52px;
            border-radius: var(--radius-btn);
            font-weight: 700;
            font-size: 20px;
            transition: var(--transition);
            display: inline-block;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
        }
        .btn-cta-big:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 30px rgba(0,0,0,0.2);
            color: var(--color-primary);
        }

        @media screen and (max-width: 40em) {
            .cta-block { padding: 40px 20px; border-radius: 16px; }
            .cta-title { font-size: 28px; }
            .cta-desc { font-size: 16px; }
            .btn-cta-big { padding: 14px 36px; font-size: 17px; width: 100%; }
        }

        /* ===== 资讯列表/CMS ===== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .news-card {
            background: var(--color-white);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
        }
        .news-img-wrap {
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: var(--color-bg);
        }
        .news-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .news-card:hover .news-img-wrap img {
            transform: scale(1.04);
        }
        .news-body {
            padding: 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-tag {
            display: inline-block;
            background: rgba(255,107,53,0.12);
            color: var(--color-primary);
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .news-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--color-dark);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .news-excerpt {
            font-size: 14px;
            color: var(--color-text-light);
            line-height: 1.6;
            flex: 1;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 12px;
        }
        .news-meta {
            font-size: 13px;
            color: var(--color-text-lighter);
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: auto;
        }
        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--color-text-lighter);
        }
        .news-empty i {
            font-size: 48px;
            margin-bottom: 16px;
            color: var(--color-border);
        }
        .news-empty p {
            font-size: 16px;
        }

        @media screen and (max-width: 64em) {
            .news-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media screen and (max-width: 40em) {
            .news-grid { grid-template-columns: 1fr; gap: 16px; }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-white);
            border-radius: 12px;
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            overflow: hidden;
            border: 1px solid var(--color-border);
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 17px;
            font-weight: 600;
            color: var(--color-dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            transition: var(--transition);
            background: var(--color-white);
        }
        .faq-question:hover { background: var(--color-bg); }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--color-primary);
            font-size: 18px;
        }
        .faq-question.open i {
            transform: rotate(180deg);
        }
        .faq-answer {
            padding: 0 24px 20px 24px;
            font-size: 15px;
            color: var(--color-text-light);
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open { display: block; }

        @media screen and (max-width: 40em) {
            .faq-question { padding: 16px 18px; font-size: 15px; }
            .faq-answer { padding: 0 18px 16px 18px; font-size: 14px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--color-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .footer-brand .logo-text {
            font-size: 22px;
            display: inline-block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: rgba(255,255,255,0.6);
            max-width: 360px;
        }
        .footer-col-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-white);
            margin-bottom: 20px;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            transition: var(--transition);
        }
        .footer-links a:hover { color: var(--color-secondary); }
        .footer-contact li {
            font-size: 14px;
            margin-bottom: 12px;
            display: flex;
            align-items: flex-start;
            gap: 10px;
            color: rgba(255,255,255,0.6);
        }
        .footer-contact i {
            color: var(--color-primary);
            width: 18px;
            margin-top: 2px;
        }
        .footer-bottom {
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }

        @media screen and (max-width: 64em) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media screen and (max-width: 40em) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-brand p { max-width: 100%; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-16 { gap: 16px; }
        .gap-24 { gap: 24px; }

        /* ===== Scroll to top ===== */
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
            color: var(--color-white);
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(255,107,53,0.3);
            z-index: 999;
            transition: var(--transition);
            opacity: 0;
            pointer-events: none;
        }
        .scroll-top.visible {
            opacity: 1;
            pointer-events: auto;
        }
        .scroll-top:hover {
            transform: translateY(-4px);
            box-shadow: 0 6px 24px rgba(255,107,53,0.4);
            color: var(--color-white);
        }

        /* ===== 响应式微调 ===== */
        @media screen and (max-width: 40em) {
            .hero-title { font-size: 28px; }
            .hero-subtitle { font-size: 15px; }
            .section-title { font-size: 24px; }
            .product-name { font-size: 15px; }
            .product-price { font-size: 18px; }
            .assurance-item { padding: 24px 12px; }
            .assurance-icon { font-size: 28px; }
            .news-title { font-size: 15px; }
            .scroll-top { bottom: 20px; right: 20px; width: 40px; height: 40px; font-size: 16px; }
        }

/* roulang page: article */
/* ===== CSS 设计变量 ===== */
        :root {
            --primary: #FF6B35;
            --primary-light: #FF8A5C;
            --secondary: #FFD23F;
            --accent: #06D6A0;
            --dark: #2B2D42;
            --dark-alt: #1A1A2E;
            --white: #FFFFFF;
            --bg-light: #F7F7F9;
            --text-dark: #2B2D42;
            --text-body: #333333;
            --text-muted: #666666;
            --text-light: #999999;
            --border-color: #E8E8EC;
            --radius-card: 16px;
            --radius-btn: 10px;
            --radius-input: 8px;
            --shadow-card: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.14);
            --shadow-nav: 0 2px 12px rgba(0,0,0,0.06);
            --font-cn: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            --font-en: "Inter", "Helvetica", sans-serif;
            --nav-height: 68px;
            --container-max: 1200px;
            --section-gap: 72px;
            --section-gap-mobile: 40px;
            --transition: 0.25s ease;
        }

        /* ===== 基础 Reset ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-cn);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; border: none; }
        .container-custom {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--nav-height);
            background: var(--white);
            border-bottom: 1px solid var(--border-color);
            box-shadow: var(--shadow-nav);
            z-index: 1000;
            transition: background var(--transition);
        }
        .site-header .container-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-left {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 22px;
            font-weight: 700;
            display: flex;
            align-items: center;
            justify-content: center;
            font-family: var(--font-en);
            box-shadow: 0 4px 12px rgba(255,107,53,0.3);
        }
        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--dark);
            letter-spacing: 1px;
        }
        .header-center {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .nav-link {
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            position: relative;
            padding: 6px 0;
            transition: color var(--transition);
        }
        .nav-link:hover,
        .nav-link.active {
            color: var(--primary);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
        }
        .badge-hot {
            background: var(--primary);
            color: var(--white);
            font-size: 11px;
            font-weight: 600;
            padding: 2px 8px;
            border-radius: 20px;
            margin-left: 4px;
            vertical-align: super;
            letter-spacing: 0.5px;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-weight: 600;
            font-size: 15px;
            padding: 10px 28px;
            border-radius: var(--radius-btn);
            box-shadow: 0 4px 16px rgba(255,107,53,0.35);
            transition: all var(--transition);
        }
        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(255,107,53,0.45);
            color: var(--white);
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255,107,53,0.3);
        }
        .hamburger {
            display: none;
            background: transparent;
            font-size: 26px;
            color: var(--dark);
            cursor: pointer;
            padding: 6px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .hamburger:hover { background: var(--bg-light); }

        /* ===== 移动端导航菜单 ===== */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            width: 100%;
            height: calc(100vh - var(--nav-height));
            background: var(--white);
            z-index: 999;
            padding: 32px 24px;
            flex-direction: column;
            gap: 20px;
            overflow-y: auto;
            box-shadow: 0 12px 40px rgba(0,0,0,0.1);
        }
        .mobile-menu.open { display: flex; }
        .mobile-menu .nav-link {
            font-size: 18px;
            padding: 12px 0;
            border-bottom: 1px solid var(--border-color);
        }
        .mobile-menu .btn-nav-cta {
            justify-content: center;
            margin-top: 12px;
            font-size: 17px;
            padding: 14px 32px;
        }

        /* ===== 面包屑 ===== */
        .breadcrumb-section {
            padding-top: calc(var(--nav-height) + 24px);
            padding-bottom: 12px;
            background: var(--white);
            border-bottom: 1px solid var(--border-color);
        }
        .breadcrumb {
            font-size: 14px;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
        }
        .breadcrumb a { color: var(--text-muted); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb .sep { color: var(--text-light); margin: 0 4px; }
        .breadcrumb .current { color: var(--text-body); font-weight: 500; }

        /* ===== 文章正文区 ===== */
        .article-main {
            background: var(--white);
            padding: 48px 0 64px;
        }
        .article-wrapper {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .article-header {
            margin-bottom: 36px;
        }
        .article-category {
            display: inline-block;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 13px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 20px;
            margin-bottom: 16px;
        }
        .article-title {
            font-size: 32px;
            font-weight: 700;
            color: var(--dark);
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 24px;
            font-size: 14px;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .article-meta i { margin-right: 6px; color: var(--primary); }
        .article-body {
            font-size: 18px;
            line-height: 1.8;
            color: var(--text-body);
        }
        .article-body p {
            margin-bottom: 1.5em;
        }
        .article-body h2, .article-body h3, .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.8em;
            color: var(--dark);
            font-weight: 700;
        }
        .article-body h2 { font-size: 26px; }
        .article-body h3 { font-size: 22px; }
        .article-body blockquote {
            border-left: 4px solid var(--primary);
            padding: 16px 24px;
            margin: 1.5em 0;
            background: var(--bg-light);
            border-radius: 0 8px 8px 0;
            color: var(--text-muted);
            font-style: italic;
        }
        .article-body ul, .article-body ol {
            margin: 1.2em 0;
            padding-left: 24px;
        }
        .article-body ul li { list-style: disc; margin-bottom: 0.4em; }
        .article-body ol li { list-style: decimal; margin-bottom: 0.4em; }
        .article-body img {
            border-radius: var(--radius-card);
            margin: 1.5em auto;
            box-shadow: var(--shadow-card);
        }
        .article-body a { color: var(--primary); text-decoration: underline; }
        .article-body a:hover { color: var(--primary-light); }

        /* ===== 相关推荐 ===== */
        .related-section {
            background: var(--bg-light);
            padding: 56px 0 64px;
        }
        .related-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--dark);
            text-align: center;
            margin-bottom: 40px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--white);
            border-radius: var(--radius-card);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: all var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
        }
        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }
        .related-card-body {
            padding: 20px;
        }
        .related-card-body h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .related-card-body .meta {
            font-size: 13px;
            color: var(--text-light);
        }
        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            margin-top: 40px;
            background: var(--white);
            color: var(--primary);
            font-weight: 600;
            padding: 12px 32px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--primary);
            transition: all var(--transition);
        }
        .btn-back:hover {
            background: var(--primary);
            color: var(--white);
            border-color: var(--primary);
        }
        .back-wrap { text-align: center; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--dark-alt);
            color: #CCCCCC;
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1.5fr;
            gap: 48px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo-text {
            color: var(--white);
            font-size: 24px;
            display: block;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #AAAAAA;
        }
        .footer-col-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--white);
            margin-bottom: 20px;
        }
        .footer-links li,
        .footer-contact li {
            margin-bottom: 12px;
            font-size: 14px;
        }
        .footer-links a {
            color: #BBBBBB;
            transition: color var(--transition);
        }
        .footer-links a:hover { color: var(--primary); }
        .footer-contact li i {
            width: 20px;
            margin-right: 10px;
            color: var(--primary);
        }
        .footer-bottom {
            text-align: center;
            padding: 20px 0;
            font-size: 13px;
            color: #888888;
        }

        /* ===== 空状态 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 24px;
        }
        .not-found-box i {
            font-size: 56px;
            color: var(--text-light);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 24px;
            color: var(--dark);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .not-found-box .btn-back {
            margin-top: 0;
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .article-title { font-size: 28px; }
        }
        @media (max-width: 768px) {
            .header-center { display: none; }
            .header-right .btn-nav-cta { display: none; }
            .hamburger { display: block; }
            .article-wrapper { padding: 0 16px; }
            .article-title { font-size: 24px; }
            .article-body { font-size: 16px; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .breadcrumb-section { padding-top: calc(var(--nav-height) + 16px); }
            .article-main { padding: 32px 0 40px; }
            .related-section { padding: 40px 0 48px; }
            .related-title { font-size: 22px; }
            .container-custom { padding: 0 16px; }
            .site-footer { padding: 40px 0 0; }
        }
        @media (max-width: 520px) {
            .article-title { font-size: 20px; }
            .article-meta { flex-direction: column; gap: 8px; align-items: flex-start; }
            .article-header { margin-bottom: 24px; }
            .related-card img { height: 160px; }
            .btn-back { width: 100%; justify-content: center; }
        }
        @media (min-width: 769px) {
            .mobile-menu { display: none !important; }
        }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #FF6B35;
            --primary-dark: #E55A2B;
            --secondary: #FFD23F;
            --accent: #06D6A0;
            --dark: #2B2D42;
            --dark-light: #3A3D52;
            --bg-light: #F7F7F9;
            --white: #FFFFFF;
            --text-dark: #2B2D42;
            --text-body: #333333;
            --text-muted: #6B6B7B;
            --border-light: #E8E8EE;
            --shadow-sm: 0 2px 12px rgba(43, 45, 66, 0.06);
            --shadow-md: 0 4px 24px rgba(43, 45, 66, 0.10);
            --shadow-lg: 0 8px 40px rgba(43, 45, 66, 0.14);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Inter", sans-serif;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --header-height: 72px;
            --container-max: 1200px;
            --section-gap: 80px;
            --section-gap-mobile: 48px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.6;
            color: var(--text-body);
            background: var(--white);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary); }
        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; padding: 0; margin: 0; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; outline: none; border: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-dark); font-weight: 700; line-height: 1.3; }
        .container-custom {
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-gap { padding: var(--section-gap) 0; }
        @media (max-width: 768px) { .section-gap { padding: var(--section-gap-mobile) 0; } }

        /* ===== Header / Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--white);
            border-bottom: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: box-shadow var(--transition);
        }
        .site-header .container-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-left { display: flex; align-items: center; gap: 10px; }
        .logo-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            color: var(--white);
            flex-shrink: 0;
        }
        .logo-text {
            font-size: 22px;
            font-weight: 800;
            color: var(--text-dark);
            letter-spacing: 0.5px;
        }
        .logo-text:hover { color: var(--text-dark); }
        .header-center { display: flex; align-items: center; gap: 8px; }
        .nav-link {
            position: relative;
            padding: 8px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-muted);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .nav-link:hover { color: var(--primary); background: rgba(255, 107, 53, 0.06); }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
            background: rgba(255, 107, 53, 0.10);
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 18px;
            right: 18px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px 3px 0 0;
        }
        .badge-hot {
            display: inline-block;
            background: linear-gradient(135deg, #FF4747, #FF6B35);
            color: var(--white);
            font-size: 10px;
            font-weight: 700;
            padding: 2px 8px;
            border-radius: 20px;
            margin-left: 4px;
            vertical-align: super;
            letter-spacing: 0.3px;
        }
        .header-right { display: flex; align-items: center; gap: 16px; }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            padding: 10px 24px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 14px;
            font-weight: 600;
            border-radius: 40px;
            transition: all var(--transition);
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.30);
        }
        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(255, 107, 53, 0.40);
            color: var(--white);
        }
        .hamburger {
            display: none;
            width: 40px;
            height: 40px;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: var(--text-dark);
            border-radius: var(--radius-sm);
            background: var(--bg-light);
            transition: background var(--transition);
        }
        .hamburger:hover { background: var(--border-light); }
        @media (max-width: 768px) {
            .header-center { display: none; }
            .hamburger { display: flex; }
            .btn-nav-cta { padding: 10px 18px; font-size: 13px; }
            .logo-text { font-size: 18px; }
        }
        /* 移动端菜单 overlay */
        .mobile-menu-overlay {
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--white);
            z-index: 999;
            display: none;
            flex-direction: column;
            padding: 32px 24px 24px;
            gap: 8px;
            overflow-y: auto;
            box-shadow: inset 0 8px 20px rgba(0,0,0,0.04);
        }
        .mobile-menu-overlay.open { display: flex; }
        .mobile-menu-overlay .nav-link {
            font-size: 18px;
            padding: 16px 12px;
            border-radius: var(--radius-md);
            display: block;
        }
        .mobile-menu-overlay .nav-link.active { background: rgba(255, 107, 53, 0.10); }
        .mobile-menu-overlay .btn-nav-cta {
            margin-top: 20px;
            text-align: center;
            justify-content: center;
            padding: 14px 24px;
            font-size: 16px;
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 88vh;
            display: flex;
            align-items: center;
            margin-top: var(--header-height);
            background: linear-gradient(135deg, #1A1A2E 0%, #2B2D42 50%, #1A1A2E 100%);
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 40%, rgba(255, 107, 53, 0.18) 0%, transparent 70%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            width: 100%;
            padding: 60px 24px;
        }
        .hero-content .hero-badge {
            display: inline-block;
            background: rgba(255, 107, 53, 0.18);
            backdrop-filter: blur(4px);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 40px;
            border: 1px solid rgba(255, 210, 63, 0.20);
            margin-bottom: 24px;
            letter-spacing: 1px;
        }
        .hero-content h1 {
            font-size: 52px;
            font-weight: 800;
            color: var(--white);
            line-height: 1.15;
            margin-bottom: 20px;
            max-width: 720px;
        }
        .hero-content h1 .highlight { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero-content .hero-sub {
            font-size: 20px;
            color: rgba(255, 255, 255, 0.78);
            line-height: 1.6;
            max-width: 580px;
            margin-bottom: 36px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 36px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 16px;
            font-weight: 700;
            border-radius: 40px;
            transition: all var(--transition);
            box-shadow: 0 4px 20px rgba(255, 107, 53, 0.35);
            border: none;
        }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 8px 32px rgba(255, 107, 53, 0.45); color: var(--white); }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            background: transparent;
            color: var(--white);
            font-size: 16px;
            font-weight: 600;
            border-radius: 40px;
            border: 2px solid rgba(255, 255, 255, 0.30);
            transition: all var(--transition);
        }
        .btn-secondary:hover { background: rgba(255, 255, 255, 0.08); border-color: rgba(255, 255, 255, 0.55); color: var(--white); }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            gap: 32px 48px;
            margin-top: 48px;
            padding-top: 36px;
            border-top: 1px solid rgba(255, 255, 255, 0.10);
        }
        .hero-stats .stat-item { text-align: left; }
        .hero-stats .stat-num { font-size: 32px; font-weight: 800; color: var(--white); line-height: 1.2; }
        .hero-stats .stat-num .accent { color: var(--secondary); }
        .hero-stats .stat-label { font-size: 14px; color: rgba(255, 255, 255, 0.55); margin-top: 2px; }
        @media (max-width: 768px) {
            .hero-content h1 { font-size: 32px; }
            .hero-content .hero-sub { font-size: 17px; }
            .hero-stats { gap: 24px; }
            .hero-stats .stat-num { font-size: 26px; }
            .btn-primary, .btn-secondary { padding: 14px 28px; font-size: 15px; }
        }
        @media (max-width: 520px) {
            .hero-content h1 { font-size: 26px; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .btn-primary, .btn-secondary { justify-content: center; }
        }

        /* ===== Section Titles ===== */
        .section-title {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 12px;
        }
        .section-subtitle {
            font-size: 17px;
            color: var(--text-muted);
            text-align: center;
            max-width: 600px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .section-title { font-size: 26px; }
            .section-subtitle { font-size: 15px; margin-bottom: 32px; }
        }

        /* ===== Feature / Category Cards ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .cat-card {
            background: var(--white);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border-light);
        }
        .cat-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .cat-card .card-img {
            width: 100%;
            aspect-ratio: 4 / 3;
            object-fit: cover;
            display: block;
            background: var(--bg-light);
        }
        .cat-card .card-body { padding: 20px 20px 22px; }
        .cat-card .card-body h3 { font-size: 18px; font-weight: 700; margin-bottom: 6px; color: var(--text-dark); }
        .cat-card .card-body p { font-size: 14px; color: var(--text-muted); line-height: 1.5; }
        .cat-card .card-tag {
            display: inline-block;
            background: rgba(255, 107, 53, 0.08);
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 2px 12px;
            border-radius: 20px;
            margin-bottom: 10px;
        }
        @media (max-width: 1024px) { .category-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 520px) { .category-grid { grid-template-columns: 1fr; } }

        /* ===== Features / Selling Points ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .feature-card {
            background: var(--white);
            padding: 36px 28px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            text-align: center;
        }
        .feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .feature-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 18px;
            background: linear-gradient(135deg, rgba(255, 107, 53, 0.10), rgba(255, 210, 63, 0.10));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--primary);
        }
        .feature-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
        .feature-card p { font-size: 15px; color: var(--text-muted); line-height: 1.6; }
        @media (max-width: 768px) { .features-grid { grid-template-columns: 1fr 1fr; gap: 20px; } }
        @media (max-width: 520px) { .features-grid { grid-template-columns: 1fr; } }

        /* ===== Scenarios ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }
        .scenario-card {
            position: relative;
            border-radius: var(--radius-lg);
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .scenario-card:hover { transform: scale(1.01); box-shadow: var(--shadow-md); }
        .scenario-card img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .scenario-card .overlay {
            position: relative;
            z-index: 2;
            padding: 32px 28px;
            background: linear-gradient(transparent, rgba(26, 26, 46, 0.82));
            width: 100%;
        }
        .scenario-card .overlay h3 { font-size: 20px; font-weight: 700; color: var(--white); margin-bottom: 4px; }
        .scenario-card .overlay p { font-size: 14px; color: rgba(255, 255, 255, 0.75); }
        @media (max-width: 640px) { .scenarios-grid { grid-template-columns: 1fr; } }

        /* ===== Data / Trust Bar ===== */
        .trust-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 40px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
        }
        .trust-item { text-align: center; }
        .trust-item .trust-icon { font-size: 32px; color: var(--accent); margin-bottom: 12px; }
        .trust-item h4 { font-size: 18px; font-weight: 700; color: var(--text-dark); margin-bottom: 4px; }
        .trust-item p { font-size: 14px; color: var(--text-muted); }
        @media (max-width: 768px) { .trust-bar { grid-template-columns: repeat(2, 1fr); gap: 20px; } }
        @media (max-width: 520px) { .trust-bar { grid-template-columns: 1fr 1fr; gap: 16px; padding: 24px 16px; } }

        /* ===== FAQ (Accordion) ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--white);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-md);
            margin-bottom: 12px;
            overflow: hidden;
            transition: box-shadow var(--transition);
        }
        .faq-item:hover { box-shadow: var(--shadow-sm); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 22px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            background: var(--white);
            transition: background var(--transition);
            gap: 12px;
        }
        .faq-question:hover { background: var(--bg-light); }
        .faq-question .faq-arrow { font-size: 14px; color: var(--text-muted); transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-arrow { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
            padding: 0 22px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 22px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, #1A1A2E 0%, #2B2D42 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
        }
        .cta-section .container-custom { position: relative; z-index: 2; }
        .cta-section h2 { font-size: 34px; font-weight: 800; color: var(--white); margin-bottom: 14px; }
        .cta-section p { font-size: 18px; color: rgba(255, 255, 255, 0.70); max-width: 560px; margin: 0 auto 32px; }
        .cta-section .btn-primary { font-size: 18px; padding: 18px 48px; }
        @media (max-width: 768px) {
            .cta-section { padding: 56px 0; }
            .cta-section h2 { font-size: 26px; }
            .cta-section p { font-size: 16px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1A2E;
            color: rgba(255, 255, 255, 0.70);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1.2fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .footer-brand .logo-text { color: var(--white); font-size: 22px; display: block; margin-bottom: 14px; }
        .footer-brand p { font-size: 14px; line-height: 1.7; color: rgba(255, 255, 255, 0.55); max-width: 340px; }
        .footer-col-title { font-size: 16px; font-weight: 700; color: var(--white); margin-bottom: 16px; }
        .footer-links li { margin-bottom: 10px; }
        .footer-links a { font-size: 14px; color: rgba(255, 255, 255, 0.55); transition: color var(--transition); }
        .footer-links a:hover { color: var(--primary); }
        .footer-contact li { display: flex; align-items: center; gap: 10px; font-size: 14px; color: rgba(255, 255, 255, 0.55); margin-bottom: 12px; }
        .footer-contact li i { width: 20px; color: var(--primary); font-size: 14px; }
        .footer-bottom {
            text-align: center;
            padding: 24px 0;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-brand p { max-width: 100%; }
        }

        /* ===== Utility ===== */
        .bg-light-section { background: var(--bg-light); }
        .text-center { text-align: center; }
        .mb-0 { margin-bottom: 0; }
        .mt-16 { margin-top: 16px; }

        /* ===== Responsive fine-tune ===== */
        @media (max-width: 1024px) {
            .container-custom { padding: 0 20px; }
        }
        @media (max-width: 768px) {
            :root { --section-gap: 48px; }
            .container-custom { padding: 0 16px; }
        }
        @media (max-width: 520px) {
            .container-custom { padding: 0 12px; }
        }

/* roulang page: category2 */
/* ===== Design Variables ===== */
        :root {
            --primary: #FF6B35;
            --primary-light: #FF8A5C;
            --secondary: #FFD23F;
            --accent-green: #06D6A0;
            --dark: #2B2D42;
            --dark-soft: #3A3D4E;
            --white: #FFFFFF;
            --bg-light: #F7F7F9;
            --bg-card: #FFFFFF;
            --text-dark: #2B2D42;
            --text-body: #3D3F4E;
            --text-muted: #6B6D7B;
            --border-light: #E8E8EE;
            --shadow-sm: 0 2px 12px rgba(43,45,66,0.06);
            --shadow-md: 0 4px 24px rgba(43,45,66,0.08);
            --shadow-lg: 0 8px 40px rgba(43,45,66,0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            --max-width: 1200px;
            --nav-height: 68px;
            --transition: all 0.25s ease;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font-family);
            color: var(--text-body);
            background: var(--bg-light);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary); }
        img { max-width: 100%; height: auto; display: block; }
        ul { list-style: none; padding: 0; margin: 0; }
        .container-custom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .section-block {
            padding: 80px 0;
        }
        .section-title {
            font-size: 36px;
            font-weight: 700;
            color: var(--text-dark);
            text-align: center;
            margin-bottom: 16px;
            line-height: 1.25;
        }
        .section-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px auto;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .section-block { padding: 48px 0; }
            .section-title { font-size: 28px; }
            .section-subtitle { font-size: 16px; margin-bottom: 32px; }
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: var(--white);
            border-bottom: 1px solid var(--border-light);
            z-index: 1000;
            box-shadow: 0 1px 6px rgba(0,0,0,0.04);
        }
        .site-header .container-custom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-left {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            color: var(--white);
        }
        .logo-text {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            letter-spacing: 1px;
        }
        .header-center {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-link {
            padding: 8px 18px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-body);
            border-radius: var(--radius-sm);
            transition: var(--transition);
            position: relative;
        }
        .nav-link:hover {
            color: var(--primary);
            background: rgba(255,107,53,0.06);
        }
        .nav-link.active {
            color: var(--primary);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 18px;
            right: 18px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 2px;
        }
        .badge-hot {
            display: inline-block;
            background: var(--primary);
            color: var(--white);
            font-size: 10px;
            font-weight: 700;
            padding: 2px 8px;
            border-radius: 20px;
            margin-left: 4px;
            vertical-align: super;
            letter-spacing: 0.3px;
        }
        .header-right {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-shrink: 0;
        }
        .btn-nav-cta {
            display: inline-flex;
            align-items: center;
            padding: 10px 28px;
            background: linear-gradient(135deg, var(--primary), #FF8C42);
            color: var(--white);
            font-size: 15px;
            font-weight: 600;
            border-radius: 50px;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(255,107,53,0.3);
            border: none;
            cursor: pointer;
        }
        .btn-nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(255,107,53,0.4);
            color: var(--white);
        }
        .btn-nav-cta:active {
            transform: translateY(0);
            box-shadow: 0 2px 8px rgba(255,107,53,0.3);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 24px;
            color: var(--text-dark);
            cursor: pointer;
            padding: 4px 8px;
        }
        @media (max-width: 768px) {
            .header-center { display: none; }
            .hamburger { display: block; }
            .btn-nav-cta { padding: 8px 20px; font-size: 14px; }
            .logo-text { font-size: 18px; }
            .logo-icon { width: 34px; height: 34px; font-size: 18px; }
        }
        /* Mobile overlay menu */
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(43,45,66,0.96);
            z-index: 999;
            padding: 32px 24px;
            flex-direction: column;
            align-items: center;
            gap: 20px;
            overflow-y: auto;
        }
        .mobile-menu-overlay.open { display: flex; }
        .mobile-menu-overlay .nav-link {
            color: var(--white);
            font-size: 20px;
            padding: 12px 24px;
            width: 100%;
            text-align: center;
            border-radius: var(--radius-sm);
        }
        .mobile-menu-overlay .nav-link:hover { background: rgba(255,255,255,0.1); color: var(--secondary); }
        .mobile-menu-overlay .nav-link.active { color: var(--secondary); }
        .mobile-menu-overlay .nav-link.active::after { display: none; }
        .mobile-menu-overlay .btn-nav-cta {
            width: 100%;
            justify-content: center;
            margin-top: 12px;
            font-size: 18px;
            padding: 14px 28px;
        }

        /* ===== Hero ===== */
        .hero-solutions {
            padding-top: var(--nav-height);
            min-height: 85vh;
            display: flex;
            align-items: center;
            position: relative;
            background: linear-gradient(135deg, #1a1a2e 0%, #2B2D42 40%, #3A3D4E 100%);
            overflow: hidden;
        }
        .hero-solutions::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.15;
            mix-blend-mode: overlay;
        }
        .hero-solutions::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 160px;
            background: linear-gradient(to top, var(--bg-light), transparent);
        }
        .hero-solutions .container-custom {
            position: relative;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 48px;
            width: 100%;
        }
        .hero-content {
            flex: 1;
            max-width: 640px;
        }
        .hero-content .hero-badge {
            display: inline-block;
            background: rgba(255,210,63,0.18);
            color: var(--secondary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 18px;
            border-radius: 50px;
            margin-bottom: 20px;
            letter-spacing: 0.5px;
            border: 1px solid rgba(255,210,63,0.2);
        }
        .hero-content h1 {
            font-size: 52px;
            font-weight: 800;
            color: var(--white);
            line-height: 1.15;
            margin-bottom: 20px;
        }
        .hero-content h1 span {
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero-content .hero-desc {
            font-size: 18px;
            color: rgba(255,255,255,0.8);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 540px;
        }
        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 40px;
            background: linear-gradient(135deg, var(--primary), #FF8C42);
            color: var(--white);
            font-size: 18px;
            font-weight: 700;
            border-radius: 50px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 24px rgba(255,107,53,0.35);
        }
        .btn-primary-lg:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(255,107,53,0.45);
            color: var(--white);
        }
        .btn-primary-lg:active { transform: translateY(0); }
        .btn-outline-lg {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 16px 36px;
            background: transparent;
            color: var(--white);
            font-size: 18px;
            font-weight: 600;
            border-radius: 50px;
            border: 2px solid rgba(255,255,255,0.4);
            cursor: pointer;
            transition: var(--transition);
        }
        .btn-outline-lg:hover {
            border-color: var(--white);
            background: rgba(255,255,255,0.08);
            color: var(--white);
        }
        .hero-visual {
            flex: 1;
            max-width: 480px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            width: 100%;
            height: auto;
            object-fit: cover;
            aspect-ratio: 4/3;
        }
        @media (max-width: 900px) {
            .hero-solutions { min-height: 70vh; }
            .hero-solutions .container-custom { flex-direction: column; text-align: center; }
            .hero-content { max-width: 100%; }
            .hero-content .hero-desc { max-width: 100%; }
            .hero-actions { justify-content: center; }
            .hero-visual { max-width: 360px; margin-top: 24px; }
            .hero-content h1 { font-size: 36px; }
        }
        @media (max-width: 520px) {
            .hero-content h1 { font-size: 28px; }
            .btn-primary-lg, .btn-outline-lg { width: 100%; justify-content: center; padding: 14px 24px; font-size: 16px; }
            .hero-actions { flex-direction: column; }
        }

        /* ===== Solutions Grid ===== */
        .solutions-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        .solution-card {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .solution-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }
        .solution-card .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .solution-card .card-body {
            padding: 28px 24px 32px;
        }
        .solution-card .card-icon {
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: linear-gradient(135deg, rgba(255,107,53,0.12), rgba(255,210,63,0.12));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: var(--primary);
            margin-bottom: 16px;
        }
        .solution-card h3 {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 12px;
        }
        .solution-card p {
            font-size: 15px;
            color: var(--text-muted);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .solution-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 4px;
        }
        .solution-card .tag-list span {
            background: var(--bg-light);
            color: var(--text-muted);
            font-size: 12px;
            padding: 4px 14px;
            border-radius: 50px;
            font-weight: 500;
        }
        @media (max-width: 900px) {
            .solutions-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 600px) {
            .solutions-grid { grid-template-columns: 1fr; }
            .solution-card .card-body { padding: 20px 18px 24px; }
            .solution-card h3 { font-size: 20px; }
        }

        /* ===== Scenarios ===== */
        .scenarios-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .scenario-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 20px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .scenario-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .scenario-item .scenario-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(255,107,53,0.1), rgba(255,210,63,0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--primary);
            margin: 0 auto 16px;
        }
        .scenario-item h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .scenario-item p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .scenarios-grid { grid-template-columns: 1fr; }
        }

        /* ===== Process ===== */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 20px 28px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            position: relative;
            transition: var(--transition);
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: var(--white);
            font-size: 20px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 16px rgba(255,107,53,0.25);
        }
        .step-card h4 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-dark);
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
        }
        .step-card::after {
            content: '→';
            position: absolute;
            right: -18px;
            top: 50%;
            transform: translateY(-50%);
            font-size: 24px;
            color: var(--primary);
            font-weight: 300;
            opacity: 0.5;
        }
        .step-card:last-child::after { display: none; }
        @media (max-width: 900px) {
            .process-steps { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .step-card::after { display: none; }
        }
        @media (max-width: 520px) {
            .process-steps { grid-template-columns: 1fr; }
        }

        /* ===== Stats ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            background: linear-gradient(135deg, var(--dark), var(--dark-soft));
            border-radius: var(--radius-xl);
            padding: 48px 32px;
            box-shadow: var(--shadow-lg);
        }
        .stat-item {
            text-align: center;
            color: var(--white);
        }
        .stat-item .stat-number {
            font-size: 42px;
            font-weight: 800;
            background: linear-gradient(135deg, var(--secondary), var(--primary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .stat-label {
            font-size: 15px;
            color: rgba(255,255,255,0.65);
            margin-top: 6px;
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .stats-row { grid-template-columns: repeat(2, 1fr); gap: 20px; padding: 32px 20px; }
            .stat-item .stat-number { font-size: 32px; }
        }
        @media (max-width: 520px) {
            .stats-row { grid-template-columns: 1fr 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            box-shadow: var(--shadow-sm);
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
            user-select: none;
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            transition: transform 0.3s ease;
            color: var(--text-muted);
            font-size: 14px;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 15px;
            line-height: 1.7;
            border-top: 0 solid var(--border-light);
        }
        .faq-item.active .faq-answer {
            max-height: 280px;
            padding: 16px 24px 24px;
            border-top-width: 1px;
        }
        @media (max-width: 520px) {
            .faq-question { font-size: 15px; padding: 16px 18px; }
            .faq-answer { font-size: 14px; }
            .faq-item.active .faq-answer { padding: 12px 18px 20px; }
        }

        /* ===== CTA Banner ===== */
        .cta-banner {
            background: linear-gradient(135deg, var(--primary), #FF8C42);
            border-radius: var(--radius-xl);
            padding: 64px 48px;
            text-align: center;
            color: var(--white);
            box-shadow: 0 12px 48px rgba(255,107,53,0.3);
            position: relative;
            overflow: hidden;
        }
        .cta-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.06;
            mix-blend-mode: overlay;
        }
        .cta-banner h2 {
            font-size: 36px;
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
        }
        .cta-banner p {
            font-size: 18px;
            opacity: 0.9;
            max-width: 560px;
            margin: 0 auto 32px;
            position: relative;
        }
        .cta-banner .btn-white-lg {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 44px;
            background: var(--white);
            color: var(--primary);
            font-size: 18px;
            font-weight: 700;
            border-radius: 50px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 24px rgba(0,0,0,0.15);
            position: relative;
        }
        .cta-banner .btn-white-lg:hover {
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(0,0,0,0.2);
            color: var(--primary);
        }
        @media (max-width: 768px) {
            .cta-banner { padding: 40px 24px; }
            .cta-banner h2 { font-size: 28px; }
            .cta-banner p { font-size: 16px; }
            .cta-banner .btn-white-lg { width: 100%; justify-content: center; padding: 14px 24px; font-size: 16px; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1A2E;
            color: rgba(255,255,255,0.75);
            padding: 64px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1.2fr;
            gap: 40px;
        }
        .footer-brand .logo-text {
            color: var(--white);
            font-size: 24px;
        }
        .footer-brand p {
            font-size: 14px;
            color: rgba(255,255,255,0.55);
            line-height: 1.7;
            margin-top: 16px;
            max-width: 320px;
        }
        .footer-col-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--white);
            margin-bottom: 18px;
        }
        .footer-links li, .footer-contact li {
            margin-bottom: 10px;
            font-size: 14px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.6);
            transition: var(--transition);
        }
        .footer-links a:hover {
            color: var(--secondary);
        }
        .footer-contact li i {
            width: 20px;
            margin-right: 8px;
            color: var(--secondary);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 24px 0;
            margin-top: 48px;
            text-align: center;
            font-size: 13px;
            color: rgba(255,255,255,0.4);
        }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr; gap: 32px; }
            .footer-brand p { max-width: 100%; }
            .site-footer { padding: 40px 0 0; }
            .footer-bottom { margin-top: 32px; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mb-16 { margin-bottom: 16px; }
        .gap-8 { gap: 8px; }
        .gap-12 { gap: 12px; }

        /* ===== Background variants ===== */
        .bg-white { background: var(--white); }
        .bg-light { background: var(--bg-light); }

        /* ===== Focus & Accessibility ===== */
        a:focus-visible, button:focus-visible, .nav-link:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Responsive navigation hamburger ===== */
        @media (max-width: 768px) {
            .header-center { display: none; }
            .hamburger { display: block; }
        }
        @media (min-width: 769px) {
            .mobile-menu-overlay { display: none !important; }
            .hamburger { display: none; }
        }