/* roulang page: index */
:root {
            --primary: #F4511E;
            --primary-dark: #E0430A;
            --accent: #FFB300;
            --brand-grad: linear-gradient(150deg, #F4511E, #FFB300);
            --ink: #1E2A32;
            --ink-deep: #14212B;
            --bg-soft: #F8F6F3;
            --card-bg: #FFFFFF;
            --text-primary: #1E2A32;
            --text-secondary: #5B6B7C;
            --border: #EFE9E2;
            --success: #00BFA5;
            --radius-lg: 20px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 16px rgba(30, 42, 50, 0.06);
            --shadow-hover: 0 12px 36px rgba(30, 42, 50, 0.12);
            --transition-base: all 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--text-primary);
            background-color: #fff;
            -webkit-font-smoothing: antialiased;
        }

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

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

        .container {
            max-width: 1140px;
        }

        .btn {
            border-radius: var(--radius-md);
            font-weight: 700;
            padding: 14px 32px;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 16px;
            border: none;
        }

        .btn:focus,
        .btn-ghost:focus,
        .btn-outline:focus {
            outline: 3px solid rgba(244, 81, 30, 0.4);
            box-shadow: none;
        }

        /* Header */
        .site-header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            height: 72px;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 8px rgba(30, 42, 50, 0.04);
        }

        .site-header .navbar {
            padding: 0;
            height: 72px;
        }

        .site-header .navbar-brand {
            display: flex;
            align-items: center;
            font-size: 0;
            line-height: 1;
        }

        .site-header .brand-hth {
            font-size: 28px;
            font-weight: 800;
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            letter-spacing: -0.02em;
        }

        .site-header .brand-official {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            margin-left: 2px;
            letter-spacing: -0.01em;
        }

        .site-header .brand-dot {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-size: 11px;
            font-weight: 700;
            margin-left: 6px;
            line-height: 1;
        }

        .site-header .navbar-nav .nav-link {
            font-size: 16px;
            font-weight: 500;
            color: var(--text-primary);
            padding: 8px 18px;
            position: relative;
            transition: var(--transition-base);
        }

        .site-header .navbar-nav .nav-link::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            border-radius: 3px;
            background: var(--brand-grad);
            transition: width 0.3s ease;
        }

        .site-header .navbar-nav .nav-link:hover {
            color: var(--primary);
        }

        .site-header .navbar-nav .nav-link:hover::after {
            width: 60%;
        }

        .site-header .navbar-nav .nav-link.active {
            color: var(--primary);
        }

        .site-header .navbar-nav .nav-link.active::after {
            width: 60%;
        }

        .btn-brand-nav {
            background: var(--brand-grad);
            color: #fff;
            font-weight: 700;
            font-size: 14px;
            padding: 10px 24px;
            border-radius: var(--radius-md);
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-brand-nav:hover {
            filter: brightness(1.1);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(244, 81, 30, 0.35);
            color: #fff;
        }

        .btn-brand-nav:active {
            transform: translateY(0);
            filter: brightness(0.9);
        }

        .navbar-toggler {
            border: none;
            padding: 4px;
        }

        .navbar-toggler:focus {
            box-shadow: none;
            outline: 3px solid rgba(244, 81, 30, 0.4);
            border-radius: 8px;
        }

        .navbar-toggler-icon {
            width: 28px;
            height: 28px;
            background-image: none;
            position: relative;
        }

        .navbar-toggler-icon::before,
        .navbar-toggler-icon::after {
            content: '';
            position: absolute;
            left: 4px;
            right: 4px;
            height: 3px;
            background: var(--primary);
            border-radius: 3px;
        }

        .navbar-toggler-icon::before {
            top: 8px;
            box-shadow: 0 8px 0 var(--primary);
        }

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

        /* Hero */
        .hero {
            background: var(--ink-deep);
            position: relative;
            padding: 80px 0 72px;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            right: -10%;
            top: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.5), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 40px;
            background: repeating-linear-gradient(90deg, transparent, transparent calc(100%/6 - 1px), rgba(255, 179, 0, 0.05) calc(100%/6 - 1px), rgba(255, 179, 0, 0.05) calc(100%/6));
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            color: #fff;
            line-height: 1.3;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
        }

        .hero h1 .text-gradient {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .hero-subtitle {
            color: rgba(255, 255, 255, 0.7);
            font-size: 18px;
            line-height: 1.7;
            margin-bottom: 0;
            max-width: 480px;
        }

        .hero-btns {
            display: flex;
            gap: 16px;
            margin-top: 32px;
            flex-wrap: wrap;
        }

        .btn-hero-primary {
            background: var(--brand-grad);
            color: #fff;
            border-radius: var(--radius-md);
            padding: 14px 32px;
            font-weight: 700;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-hero-primary:hover {
            filter: brightness(1.1);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(244, 81, 30, 0.35);
            color: #fff;
        }

        .btn-hero-primary:active {
            transform: translateY(0);
            filter: brightness(0.9);
        }

        .btn-hero-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.6);
            border-radius: var(--radius-md);
            padding: 12px 30px;
            font-weight: 700;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

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

        .hero-badges {
            display: flex;
            gap: 12px;
            margin-top: 28px;
            flex-wrap: wrap;
        }

        .badge-card {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            padding: 10px 18px;
            display: flex;
            align-items: center;
            gap: 12px;
            backdrop-filter: blur(4px);
        }

        .badge-card .badge-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            background: rgba(255, 179, 0, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 16px;
            flex-shrink: 0;
        }

        .badge-card .badge-info {
            display: flex;
            flex-direction: column;
        }

        .badge-card .badge-number {
            font-size: 20px;
            font-weight: 700;
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-variant-numeric: tabular-nums;
            letter-spacing: -0.01em;
            line-height: 1.2;
        }

        .badge-card .badge-label {
            font-size: 12px;
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.4;
        }

        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .visual-frame {
            position: relative;
            border-radius: 24px;
            padding: 3px;
            background: var(--brand-grad);
            box-shadow: 0 12px 36px rgba(30, 42, 50, 0.3);
            max-width: 480px;
            width: 100%;
        }

        .visual-frame img {
            border-radius: 21px;
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

        .visual-frame .version-badge {
            position: absolute;
            bottom: 16px;
            left: 16px;
            background: rgba(20, 33, 43, 0.85);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 999px;
            backdrop-filter: blur(4px);
            letter-spacing: 0.02em;
        }

        /* Section base */
        .section {
            padding: 100px 0;
        }

        .section-heading {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-heading h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            margin-bottom: 12px;
        }

        .section-heading h2 .text-gradient {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .section-heading .section-subtitle {
            font-size: 15px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
        }

        .section-heading.text-start {
            text-align: left;
        }

        .section-heading.text-start .section-subtitle {
            margin: 0;
        }

        /* Features */
        .features-section {
            background: var(--bg-soft);
        }

        .feature-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
            height: 100%;
            position: relative;
            overflow: hidden;
            border: 1px solid var(--border);
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: var(--brand-grad);
            border-radius: 3px 3px 0 0;
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.35s ease;
        }

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

        .feature-card:hover::before {
            transform: scaleX(1);
        }

        .feature-card .feature-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--brand-grad);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 24px;
            margin-bottom: 18px;
            transition: transform 0.3s ease;
        }

        .feature-card:hover .feature-icon {
            transform: scale(1.05);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-primary);
        }

        .feature-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }

        .feature-img {
            height: 160px;
            border-radius: var(--radius-md);
            background: #F1EDE8;
            overflow: hidden;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        .feature-links {
            display: flex;
            gap: 24px;
            justify-content: center;
            margin-top: 40px;
        }

        .feature-links a {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .feature-links a:hover {
            text-decoration: underline;
        }

        /* System requirements */
        .sysreq-section {
            background: var(--ink);
            position: relative;
            overflow: hidden;
        }

        .sysreq-section::before {
            content: '';
            position: absolute;
            left: -10%;
            bottom: -30%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.2), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .sysreq-section .section-heading h2 {
            color: #fff;
        }

        .sysreq-section .section-heading .section-subtitle {
            color: rgba(255, 255, 255, 0.6);
        }

        .sysreq-card {
            background: rgba(255, 255, 255, 0.05);
            border-radius: 24px;
            padding: 32px;
            backdrop-filter: blur(8px);
        }

        .sysreq-row {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .sysreq-row:last-child {
            border-bottom: none;
        }

        .sysreq-label {
            color: rgba(255, 255, 255, 0.6);
            font-size: 14px;
        }

        .sysreq-value {
            color: #fff;
            font-weight: 600;
            font-variant-numeric: tabular-nums;
            font-size: 14px;
            text-align: right;
        }

        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            height: 100%;
            align-content: center;
        }

        .platform-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 10px;
            text-align: center;
            padding: 16px 8px;
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.03);
            transition: var(--transition-base);
        }

        .platform-item:hover {
            background: rgba(255, 255, 255, 0.08);
            transform: translateY(-2px);
        }

        .platform-item .platform-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent);
            font-size: 26px;
        }

        .platform-item span {
            color: rgba(255, 255, 255, 0.7);
            font-size: 14px;
            font-weight: 500;
        }

        .sysreq-note {
            margin-top: 32px;
            color: rgba(255, 255, 255, 0.4);
            font-size: 13px;
            text-align: center;
        }

        /* Testimonials */
        .testimonials-section {
            background: var(--bg-soft);
        }

        .testimonial-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 28px;
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
            height: 100%;
            border: 1px solid var(--border);
        }

        .testimonial-card:hover {
            box-shadow: var(--shadow-hover);
        }

        .testimonial-head {
            display: flex;
            align-items: center;
            gap: 14px;
            margin-bottom: 18px;
        }

        .testimonial-avatar {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--brand-grad);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 18px;
            font-weight: 700;
            flex-shrink: 0;
        }

        .testimonial-name {
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.3;
        }

        .testimonial-role {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.3;
        }

        .testimonial-body {
            border-left: 4px solid transparent;
            padding-left: 16px;
            position: relative;
            font-size: 15px;
            line-height: 1.8;
            color: var(--text-primary);
            margin-bottom: 16px;
            background: linear-gradient(180deg, #F4511E, #FFB300);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            border-left-color: var(--primary);
        }

        .testimonial-body p {
            background: none;
            -webkit-background-clip: initial;
            background-clip: initial;
            color: var(--text-primary);
            font-size: 15px;
            line-height: 1.8;
        }

        .testimonial-body::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            bottom: 0;
            width: 4px;
            border-radius: 4px;
            background: var(--brand-grad);
        }

        .testimonial-body p {
            margin: 0;
        }

        .testimonial-foot {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 8px;
        }

        .stars {
            color: var(--accent);
            font-size: 14px;
            letter-spacing: 2px;
        }

        .stars .far {
            color: #D5CEC4;
        }

        .tag-pill {
            background: #FFF1EC;
            color: var(--primary);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
        }

        /* News section */
        .news-section {
            background: #fff;
        }

        .news-heading-row {
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
            margin-bottom: 40px;
            flex-wrap: wrap;
            gap: 16px;
        }

        .news-heading-row h2 {
            font-size: 34px;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-primary);
            margin: 0;
        }

        .view-all-link {
            font-size: 15px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .view-all-link i {
            transition: transform 0.3s ease;
        }

        .view-all-link:hover {
            color: var(--primary-dark);
        }

        .view-all-link:hover i {
            transform: translateX(4px);
        }

        .news-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
            height: 100%;
            overflow: hidden;
            border: 1px solid var(--border);
        }

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

        .news-card a {
            display: block;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .news-thumb {
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background: #F1EDE8;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
        }

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

        .news-card:hover .news-thumb img {
            transform: scale(1.03);
        }

        .news-thumb .thumb-placeholder {
            font-size: 40px;
            font-weight: 800;
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .news-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .news-body .tag-pill {
            align-self: flex-start;
            margin-bottom: 12px;
        }

        .news-body h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            line-height: 1.4;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            transition: color 0.3s ease;
        }

        .news-card:hover .news-body h3 {
            color: var(--primary);
        }

        .news-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 14px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex: 1;
        }

        .news-meta {
            display: flex;
            gap: 16px;
            font-size: 13px;
            color: var(--text-secondary);
            border-top: 1px solid var(--border);
            padding-top: 14px;
            margin-top: auto;
        }

        .news-meta span {
            display: inline-flex;
            align-items: center;
            gap: 4px;
        }

        .news-meta i {
            color: var(--text-secondary);
            opacity: 0.7;
            font-size: 12px;
        }

        .empty-state {
            border: 1px dashed #D5CEC4;
            border-radius: var(--radius-lg);
            padding: 48px 24px;
            text-align: center;
            background: #FAF8F6;
        }

        .empty-state .empty-icon {
            font-size: 48px;
            color: var(--text-secondary);
            opacity: 0.3;
            margin-bottom: 12px;
            display: inline-block;
            animation: spin 6s linear infinite;
        }

        @keyframes spin {
            from {
                transform: rotate(0deg);
            }
            to {
                transform: rotate(360deg);
            }
        }

        .empty-state p {
            font-size: 15px;
            color: var(--text-secondary);
            margin: 0;
        }

        /* FAQ */
        .faq-section {
            background: var(--bg-soft);
        }

        .faq-container {
            max-width: 760px;
            margin: 0 auto;
        }

        .accordion-item {
            border: 1px solid var(--border) !important;
            border-radius: 16px !important;
            margin-bottom: 16px;
            overflow: hidden;
            background: #fff;
            box-shadow: var(--shadow-sm);
            transition: var(--transition-base);
        }

        .accordion-item:has(.accordion-button:not(.collapsed)) {
            border-color: rgba(244, 81, 30, 0.3) !important;
            box-shadow: var(--shadow-hover);
        }

        .accordion-button {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            background: #fff;
            padding: 24px;
            border: none;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: var(--transition-base);
            box-shadow: none !important;
        }

        .accordion-button::after {
            display: none;
        }

        .accordion-button:not(.collapsed) {
            color: var(--primary);
            background: #fff;
            box-shadow: none !important;
        }

        .accordion-button:focus {
            box-shadow: none;
            outline: 3px solid rgba(244, 81, 30, 0.3);
            outline-offset: -3px;
            border-radius: 16px;
        }

        .accordion-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: #FFF1EC;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: 700;
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }

        .accordion-button:not(.collapsed) .accordion-icon {
            transform: rotate(45deg);
            background: var(--brand-grad);
            color: #fff;
        }

        .accordion-body {
            padding: 0 24px 24px;
            font-size: 14px;
            line-height: 1.8;
            color: var(--text-secondary);
            background: #fff;
        }

        /* Footer */
        .site-footer {
            background: var(--ink);
            position: relative;
            padding-top: 0;
        }

        .footer-gradient-bar {
            height: 4px;
            background: var(--brand-grad);
            width: 100%;
        }

        .footer-content {
            padding: 56px 0 32px;
        }

        .footer-brand .brand-hth {
            font-size: 26px;
            font-weight: 800;
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .footer-brand .brand-official {
            font-size: 18px;
            font-weight: 600;
            color: #fff;
        }

        .footer-brand .brand-dot {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-size: 10px;
            font-weight: 700;
            margin-left: 4px;
            line-height: 1;
        }

        .footer-desc {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            line-height: 1.7;
            margin-top: 16px;
            margin-bottom: 0;
            max-width: 320px;
        }

        .footer-title {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }

        .footer-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 24px;
            height: 3px;
            border-radius: 3px;
            background: var(--brand-grad);
        }

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

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

        .footer-links a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            transition: var(--transition-base);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

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

        .footer-links a i {
            font-size: 12px;
            opacity: 0.6;
        }

        .footer-contact {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .footer-contact i {
            color: var(--accent);
            font-size: 14px;
            width: 18px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.45);
            font-size: 13px;
        }

        /* Responsive */
        @media (max-width: 991.98px) {
            .section {
                padding: 64px 0;
            }

            .hero h1 {
                font-size: 40px;
            }

            .hero-visual {
                margin-top: 40px;
            }

            .platform-grid {
                margin-top: 32px;
            }

            .site-header .navbar-collapse {
                background: #fff;
                padding: 16px;
                border-radius: 16px;
                margin-top: 8px;
                box-shadow: var(--shadow-hover);
                border: 1px solid var(--border);
            }

            .site-header .navbar-nav .nav-link {
                padding: 12px 16px;
            }

            .btn-brand-nav {
                margin-top: 12px;
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 767.98px) {
            .hero {
                padding: 56px 0 48px;
            }

            .hero h1 {
                font-size: 32px;
            }

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

            .hero-btns {
                flex-direction: column;
                align-items: stretch;
            }

            .btn-hero-primary,
            .btn-hero-outline {
                justify-content: center;
                width: 100%;
                min-height: 44px;
            }

            .hero-badges {
                flex-wrap: nowrap;
                overflow-x: auto;
                padding-bottom: 8px;
                -webkit-overflow-scrolling: touch;
            }

            .badge-card {
                flex-shrink: 0;
            }

            .section-heading h2 {
                font-size: 26px;
            }

            .news-heading-row h2 {
                font-size: 26px;
            }

            .feature-links {
                flex-direction: column;
                align-items: center;
            }

            .system-req-card {
                padding: 20px;
            }

            .sysreq-card {
                padding: 20px;
            }

            .platform-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }

            .accordion-button {
                font-size: 15px;
                padding: 18px 16px;
            }

            .accordion-body {
                padding: 0 16px 18px;
            }

            .footer-content [class^="col-"] {
                margin-bottom: 32px;
            }
        }

        @media (max-width: 576px) {
            .btn-hero-primary,
            .btn-hero-outline,
            .btn-brand-nav {
                font-size: 15px;
                padding: 12px 24px;
            }

            .visual-frame {
                max-width: 100%;
            }

            .news-body {
                padding: 16px;
            }

            .news-meta {
                flex-direction: column;
                gap: 8px;
            }
        }

/* roulang page: article */
:root {
            --brand-grad: linear-gradient(150deg, #F4511E, #FFB300);
            --primary: #F4511E;
            --primary-dark: #E0430A;
            --ink: #1E2A32;
            --ink-deep: #14212B;
            --bg-soft: #F8F6F3;
            --card-bg: #FFFFFF;
            --text-primary: #1E2A32;
            --text-secondary: #5B6B7C;
            --border: #EFE9E2;
            --success: #00BFA5;
            --radius: 20px;
            --radius-lg: 24px;
            --shadow-sm: 0 4px 16px rgba(30,42,50,0.06);
            --shadow-lg: 0 12px 36px rgba(30,42,50,0.12);
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            color: var(--text-primary);
            background: #fff;
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }

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

        ul,
        ol {
            list-style: none;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s ease;
        }

        button,
        input {
            font-family: inherit;
        }

        .container {
            max-width: 1140px;
        }

        /* ===== Header / Nav ===== */
        .site-header {
            background: #fff;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1050;
            transition: box-shadow 0.3s ease;
        }

        .site-header.header-scrolled {
            box-shadow: 0 6px 20px rgba(30, 42, 50, 0.08);
        }

        .site-header .navbar {
            min-height: 72px;
            padding: 0;
            background: transparent;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 4px;
            font-size: 22px;
            font-weight: 800;
            padding: 0;
            line-height: 1;
        }

        .navbar-brand .brand-hth {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
            font-weight: 800;
            letter-spacing: -0.02em;
        }

        .navbar-brand .brand-official {
            color: var(--ink);
            font-weight: 600;
            letter-spacing: -0.01em;
        }

        .navbar-brand .brand-dot {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-left: 4px;
            line-height: 1;
        }

        .navbar-nav {
            gap: 8px;
        }

        .nav-link {
            color: var(--text-primary);
            font-weight: 500;
            font-size: 16px;
            padding: 10px 16px !important;
            position: relative;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            left: 16px;
            right: 16px;
            bottom: 4px;
            height: 3px;
            border-radius: 3px 3px 0 0;
            background: var(--brand-grad);
            width: 0;
            transition: width 0.3s ease;
        }

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

        .nav-link:hover::after,
        .nav-link.active::after {
            width: calc(100% - 32px);
        }

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

        .btn-brand-nav {
            background: var(--brand-grad);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            padding: 10px 24px;
            border-radius: 12px;
            border: none;
            transition: all 0.3s ease;
            white-space: nowrap;
        }

        .btn-brand-nav:hover {
            filter: brightness(1.1);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(244, 81, 30, 0.35);
            color: #fff;
        }

        .btn-brand-nav:active {
            transform: translateY(0);
            filter: brightness(0.9);
        }

        .btn-brand-nav:focus {
            outline: 3px solid rgba(244, 81, 30, 0.4);
            box-shadow: none;
        }

        .navbar-toggler {
            border: none;
            padding: 6px 8px;
            color: var(--primary);
        }

        .navbar-toggler:focus {
            box-shadow: 0 0 0 3px rgba(244, 81, 30, 0.3);
        }

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23F4511E' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ===== Article Hero ===== */
        .article-hero {
            background: var(--bg-soft);
            padding: 48px 0 32px;
            position: relative;
            overflow: hidden;
        }

        .article-hero::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 420px;
            height: 280px;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.12), transparent 70%);
            pointer-events: none;
        }

        .article-hero-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 44px 48px 36px;
            position: relative;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }

        .article-hero-card::before {
            content: '';
            position: absolute;
            top: 0;
            right: 0;
            width: 360px;
            height: 100%;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            opacity: 0.06;
            border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
            pointer-events: none;
        }

        .breadcrumb-nav {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            font-size: 13px;
            color: var(--text-secondary);
            margin-bottom: 22px;
            position: relative;
            z-index: 1;
        }

        .breadcrumb-nav a {
            color: var(--text-secondary);
            transition: color 0.2s;
        }

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

        .breadcrumb-nav .separator {
            margin: 0 10px;
            color: #C9D2DB;
        }

        .breadcrumb-nav .current {
            color: var(--primary);
            font-weight: 600;
            max-width: 360px;
            overflow: hidden;
            text-overflow: ellipsis;
            white-space: nowrap;
        }

        .article-title {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: -0.01em;
            position: relative;
            z-index: 1;
        }

        .article-meta {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 13px;
            color: var(--text-secondary);
            position: relative;
            z-index: 1;
        }

        .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

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

        .meta-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(244, 81, 30, 0.08);
            color: var(--primary);
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 12px;
        }

        /* ===== Article Body ===== */
        .article-body {
            background: var(--bg-soft);
            padding-bottom: 40px;
        }

        .article-wrapper {
            max-width: 780px;
            margin: 0 auto;
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 48px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }

        .article-content {
            font-size: 16px;
            line-height: 1.9;
            color: var(--text-primary);
        }

        .article-content p {
            margin-bottom: 24px;
            text-align: left;
        }

        .article-content h2 {
            font-size: 22px;
            font-weight: 700;
            margin: 40px 0 16px;
            color: var(--text-primary);
            letter-spacing: -0.01em;
            line-height: 1.5;
        }

        .article-content h3 {
            font-size: 18px;
            font-weight: 700;
            margin: 32px 0 12px;
            color: var(--text-primary);
            line-height: 1.5;
        }

        .article-content h4 {
            font-size: 16px;
            font-weight: 700;
            margin: 28px 0 10px;
            color: var(--text-primary);
        }

        .article-content img {
            border-radius: 16px;
            margin: 24px 0;
            width: 100%;
            height: auto;
            object-fit: cover;
        }

        .article-content blockquote {
            border-left: 4px solid var(--primary);
            background: rgba(244, 81, 30, 0.05);
            padding: 16px 20px;
            border-radius: 8px;
            margin: 24px 0;
            color: var(--ink);
            font-size: 15px;
            line-height: 1.8;
        }

        .article-content code {
            background: #F1EDE8;
            border-radius: 8px;
            padding: 2px 8px;
            font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
            font-size: 14px;
            color: var(--primary-dark);
        }

        .article-content pre {
            background: var(--ink);
            color: #E8EDF2;
            padding: 20px;
            border-radius: 12px;
            overflow-x: auto;
            margin: 24px 0;
            font-size: 14px;
            line-height: 1.7;
        }

        .article-content pre code {
            background: transparent;
            color: inherit;
            padding: 0;
            font-size: inherit;
        }

        .article-content a {
            color: var(--primary);
            font-weight: 600;
            border-bottom: 1px solid rgba(244, 81, 30, 0.3);
        }

        .article-content a:hover {
            color: var(--primary-dark);
            border-bottom-color: var(--primary-dark);
        }

        .article-content ul,
        .article-content ol {
            padding-left: 20px;
            margin: 0 0 24px;
        }

        .article-content ul {
            list-style: disc;
        }

        .article-content ol {
            list-style: decimal;
        }

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

        .article-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 14px;
        }

        .article-content table th,
        .article-content table td {
            border: 1px solid var(--border);
            padding: 10px 14px;
            text-align: left;
        }

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

        .not-found-box {
            text-align: center;
            padding: 48px 24px;
        }

        .not-found-box i {
            font-size: 48px;
            color: #C9D2DB;
            margin-bottom: 20px;
        }

        .not-found-box h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }

        .not-found-box p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        /* ===== Related / Bottom ===== */
        .article-related {
            background: var(--bg-soft);
            padding: 24px 0 72px;
        }

        .article-related .container {
            max-width: 860px;
        }

        .btm-divider {
            height: 1px;
            background: var(--border);
            margin-bottom: 24px;
        }

        .btm-toolbar {
            display: flex;
            align-items: center;
            justify-content: flex-start;
            margin-bottom: 32px;
        }

        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            transition: all 0.3s ease;
        }

        .btn-back i {
            transition: transform 0.3s ease;
        }

        .btn-back:hover {
            color: var(--primary);
        }

        .btn-back:hover i {
            transform: translateX(-4px);
        }

        .related-title {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 24px;
            padding-left: 12px;
            border-left: 4px solid var(--primary);
            line-height: 1.4;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

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

        .related-card .card-thumb {
            height: 160px;
            border-radius: 12px;
            background: var(--bg-soft);
            overflow: hidden;
            margin-bottom: 16px;
        }

        .related-card .card-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .related-card .card-title {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.5;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-card .card-excerpt {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .related-empty {
            grid-column: 1 / -1;
            border: 1px dashed #D5CEC4;
            border-radius: var(--radius);
            padding: 48px 24px;
            text-align: center;
            background: rgba(255, 255, 255, 0.5);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 12px;
        }

        .related-empty .empty-icon {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            border: 2px solid rgba(30, 42, 50, 0.12);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            color: rgba(30, 42, 50, 0.25);
        }

        .related-empty p {
            font-size: 14px;
            color: var(--text-secondary);
        }

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

        .cta-section::before {
            content: '';
            position: absolute;
            top: -120px;
            right: -80px;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.45), transparent 70%);
            pointer-events: none;
        }

        .cta-section::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 100px;
            background: url('/assets/images/backpic/back-3.png') center top / cover no-repeat;
            opacity: 0.05;
            pointer-events: none;
        }

        .cta-inner {
            position: relative;
            z-index: 1;
            text-align: center;
            max-width: 640px;
            margin: 0 auto;
        }

        .cta-inner h2 {
            font-size: 34px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.01em;
        }

        .cta-inner h2 span {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }

        .cta-inner p {
            font-size: 16px;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 32px;
            line-height: 1.8;
        }

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

        .btn-brand {
            background: var(--brand-grad);
            color: #fff;
            font-weight: 700;
            font-size: 15px;
            padding: 14px 32px;
            border-radius: 12px;
            border: none;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        .btn-brand:hover {
            filter: brightness(1.1);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(244, 81, 30, 0.35);
            color: #fff;
        }

        .btn-brand:active {
            transform: translateY(0);
            filter: brightness(0.9);
        }

        .btn-brand:focus {
            outline: 3px solid rgba(244, 81, 30, 0.4);
        }

        .btn-outline-light {
            background: transparent;
            border: 2px solid rgba(255, 255, 255, 0.6);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: 12px;
            transition: all 0.3s ease;
        }

        .btn-outline-light:hover {
            background: #fff;
            border-color: #fff;
            color: var(--text-primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(255, 255, 255, 0.15);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--ink);
            position: relative;
        }

        .footer-gradient-bar {
            height: 4px;
            background: var(--brand-grad);
        }

        .footer-content {
            padding: 56px 0 32px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 4px;
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .footer-brand .brand-hth {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
            font-weight: 800;
        }

        .footer-brand .brand-official {
            color: #fff;
            font-weight: 600;
        }

        .footer-brand .brand-dot {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-size: 12px;
            font-weight: 700;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-left: 4px;
            line-height: 1;
        }

        .footer-desc {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.5);
            line-height: 1.8;
            max-width: 320px;
        }

        .footer-title {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 20px;
        }

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

        .footer-links a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            transition: color 0.2s;
        }

        .footer-links a i {
            font-size: 10px;
            margin-right: 6px;
            color: rgba(255, 179, 0, 0.6);
            vertical-align: 1px;
        }

        .footer-links a:hover {
            color: #FFB300;
        }

        .footer-contact {
            display: flex;
            align-items: center;
            gap: 12px;
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            margin-bottom: 14px;
        }

        .footer-contact i {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            background: rgba(255, 255, 255, 0.08);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #FFB300;
            font-size: 14px;
            flex-shrink: 0;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 20px 0;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.45);
        }

        /* ===== Responsive ===== */
        @media (max-width: 991px) {
            .article-title {
                font-size: 30px;
            }

            .article-wrapper {
                padding: 36px;
            }

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

            .navbar-collapse {
                background: #fff;
                border-radius: 0 0 var(--radius) var(--radius);
                padding: 16px 20px 24px;
                box-shadow: var(--shadow-lg);
                border: 1px solid var(--border);
                border-top: none;
                margin-top: 8px;
            }

            .navbar-nav {
                gap: 4px;
                margin-bottom: 16px;
            }

            .nav-link::after {
                display: none;
            }

            .nav-link.active {
                background: rgba(244, 81, 30, 0.08);
                border-radius: 10px;
            }

            .btn-brand-nav {
                width: 100%;
                justify-content: center;
            }
        }

        @media (max-width: 767px) {
            .article-hero {
                padding: 32px 0 24px;
            }

            .article-hero-card {
                padding: 28px 24px 24px;
                border-radius: 16px;
            }

            .article-title {
                font-size: 24px;
                line-height: 1.45;
            }

            .article-meta {
                gap: 12px;
                font-size: 12px;
                flex-wrap: wrap;
            }

            .meta-badge {
                font-size: 11px;
            }

            .article-wrapper {
                padding: 24px 20px;
                border-radius: 16px;
            }

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

            .article-content h2 {
                font-size: 20px;
                margin-top: 32px;
            }

            .article-content h3 {
                font-size: 17px;
            }

            .breadcrumb-nav .current {
                max-width: 180px;
            }

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

            .cta-inner h2 {
                font-size: 26px;
            }

            .btn-brand,
            .btn-outline-light {
                width: 100%;
                justify-content: center;
            }

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

        @media (max-width: 575px) {
            .article-meta {
                flex-direction: row;
                overflow-x: auto;
                padding-bottom: 4px;
                -webkit-overflow-scrolling: touch;
            }

            .footer-content {
                padding: 40px 0 24px;
            }
        }

        @media (prefers-reduced-motion: reduce) {
            * {
                transition: none !important;
                animation: none !important;
            }
        }

/* roulang page: category1 */
:root {
            --brand-grad: linear-gradient(150deg, #F4511E, #FFB300);
            --primary: #F4511E;
            --primary-dark: #E0430A;
            --ink: #1E2A32;
            --ink-deep: #14212B;
            --bg-soft: #F8F6F3;
            --card-bg: #FFFFFF;
            --text-primary: #1E2A32;
            --text-secondary: #5B6B7C;
            --border: #EFE9E2;
            --success: #00BFA5;
            --shadow-sm: 0 4px 16px rgba(30, 42, 50, 0.06);
            --shadow-lg: 0 12px 36px rgba(30, 42, 50, 0.12);
            --radius-card: 20px;
            --radius-lg: 24px;
            --radius-sm: 12px;
        }

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

        html {
            scroll-behavior: smooth;
            scroll-padding-top: 96px;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            color: var(--text-primary);
            background: var(--bg-soft);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

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

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.25s ease;
        }

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

        .container {
            max-width: 1140px;
        }

        .section-padding {
            padding: 100px 0;
        }

        .grad-text {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }

        .btn-brand-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: var(--brand-grad);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 14px 32px;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s ease;
            box-shadow: 0 6px 18px rgba(244, 81, 30, 0.25);
        }

        .btn-brand-primary:hover {
            filter: brightness(1.1);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(244, 81, 30, 0.35);
            color: #fff;
        }

        .btn-brand-primary:active {
            transform: translateY(0);
            filter: brightness(0.9);
        }

        .btn-brand-primary:focus-visible {
            outline: 3px solid rgba(244, 81, 30, 0.4);
            outline-offset: 2px;
        }

        .btn-brand-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            border-radius: var(--radius-sm);
            padding: 12px 30px;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .btn-brand-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 10px 24px rgba(244, 81, 30, 0.25);
        }

        .btn-brand-outline-light {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.7);
            border-radius: var(--radius-sm);
            padding: 12px 30px;
            font-weight: 700;
            font-size: 16px;
            transition: all 0.3s ease;
        }

        .btn-brand-outline-light:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: #fff;
            color: #fff;
            transform: translateY(-2px);
        }

        /* ===== Header ===== */
        .site-header {
            background: #fff;
            box-shadow: none;
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
        }

        .site-header .navbar {
            min-height: 72px;
            padding: 0;
            background: #fff;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 2px;
            padding: 0;
            margin: 0;
        }

        .brand-hth {
            background: var(--brand-grad);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            font-weight: 800;
            font-size: 26px;
            letter-spacing: -0.01em;
        }

        .brand-official {
            color: var(--ink);
            font-weight: 600;
            font-size: 18px;
            margin-left: 2px;
        }

        .brand-dot {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 22px;
            height: 22px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-size: 13px;
            font-weight: 700;
            margin-left: 6px;
        }

        .navbar-nav {
            gap: 8px;
        }

        .navbar-nav .nav-link {
            color: var(--text-primary);
            font-weight: 500;
            font-size: 15px;
            padding: 10px 18px !important;
            position: relative;
            border-radius: 0;
        }

        .navbar-nav .nav-link::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 0;
            height: 3px;
            border-radius: 3px;
            background: var(--brand-grad);
            transition: width 0.3s ease;
        }

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

        .navbar-nav .nav-link:hover::after {
            width: 60%;
        }

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

        .navbar-nav .nav-link.active::after {
            width: 60%;
        }

        .btn-brand-nav {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: var(--brand-grad);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            padding: 10px 24px;
            font-weight: 700;
            font-size: 14px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 14px rgba(244, 81, 30, 0.25);
        }

        .btn-brand-nav:hover {
            filter: brightness(1.08);
            transform: translateY(-2px);
            color: #fff;
            box-shadow: 0 8px 20px rgba(244, 81, 30, 0.32);
        }

        .navbar-toggler {
            border: none;
            padding: 6px 10px;
        }

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

        .navbar-toggler-icon {
            background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%23F4511E' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2.5' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
        }

        /* ===== Category Hero ===== */
        .category-hero {
            background: var(--bg-soft);
            padding: 72px 0 56px;
            position: relative;
            overflow: hidden;
        }

        .category-hero::before {
            content: "";
            position: absolute;
            top: -120px;
            right: -120px;
            width: 420px;
            height: 420px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.12), transparent 70%);
            pointer-events: none;
        }

        .category-hero::after {
            content: "";
            position: absolute;
            bottom: -80px;
            left: 20%;
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(255, 179, 0, 0.10), transparent 70%);
            pointer-events: none;
        }

        .category-hero .container {
            position: relative;
            z-index: 1;
        }

        .category-hero-card {
            background: var(--card-bg);
            border-radius: var(--radius-lg);
            padding: 48px 52px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            position: relative;
            overflow: hidden;
        }

        .category-hero-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 4px;
            background: var(--brand-grad);
        }

        .category-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(244, 81, 30, 0.08);
            color: var(--primary);
            font-size: 13px;
            font-weight: 700;
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 20px;
            letter-spacing: 0.02em;
        }

        .category-hero-title {
            font-size: 40px;
            font-weight: 800;
            color: var(--ink);
            margin-bottom: 16px;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }

        .category-hero-title .grad-text {
            font-size: 1em;
        }

        .category-hero-subtitle {
            font-size: 16px;
            color: var(--text-secondary);
            max-width: 640px;
            margin-bottom: 28px;
            line-height: 1.8;
        }

        .category-hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* ===== Feature Strip ===== */
        .feature-strip {
            padding: 48px 0 0;
        }

        .feature-strip-card {
            background: var(--card-bg);
            border-radius: var(--radius-card);
            padding: 28px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
            height: 100%;
        }

        .feature-strip-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: rgba(244, 81, 30, 0.25);
        }

        .feature-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: var(--brand-grad);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 22px;
            margin-bottom: 18px;
            box-shadow: 0 6px 16px rgba(244, 81, 30, 0.25);
        }

        .feature-strip-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }

        .feature-strip-card p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.75;
            margin: 0;
        }

        /* ===== Main Content ===== */
        .category-main {
            padding: 64px 0 80px;
        }

        .category-article {
            background: #fff;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border);
            padding: 44px 44px 52px;
            box-shadow: var(--shadow-sm);
        }

        .category-section {
            margin-bottom: 52px;
            scroll-margin-top: 100px;
        }

        .category-section:last-child {
            margin-bottom: 0;
        }

        .section-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--brand-grad);
            color: #fff;
            font-weight: 800;
            font-size: 16px;
            margin-bottom: 14px;
            box-shadow: 0 4px 12px rgba(244, 81, 30, 0.25);
        }

        .category-section h2 {
            font-size: 26px;
            font-weight: 800;
            color: var(--ink);
            margin-bottom: 14px;
            letter-spacing: -0.015em;
            line-height: 1.35;
        }

        .category-section h2::after {
            content: "";
            display: block;
            width: 44px;
            height: 3px;
            background: var(--brand-grad);
            border-radius: 3px;
            margin-top: 10px;
        }

        .category-section p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.85;
            margin-bottom: 14px;
        }

        .section-img {
            width: 100%;
            border-radius: 16px;
            margin-top: 18px;
            object-fit: cover;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }

        /* Steps */
        .step-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            margin: 20px 0 8px;
        }

        .step-item {
            display: flex;
            gap: 16px;
            background: var(--bg-soft);
            border-radius: 16px;
            padding: 20px 24px;
            border: 1px solid var(--border);
            transition: all 0.25s ease;
        }

        .step-item:hover {
            border-color: rgba(244, 81, 30, 0.3);
            box-shadow: var(--shadow-sm);
        }

        .step-badge {
            flex-shrink: 0;
            width: 36px;
            height: 36px;
            border-radius: 12px;
            background: var(--brand-grad);
            color: #fff;
            font-weight: 800;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .step-item h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 4px;
        }

        .step-item p {
            font-size: 14px;
            color: var(--text-secondary);
            margin: 0;
            line-height: 1.7;
        }

        /* Advice List */
        .advice-list {
            list-style: none;
            padding: 0;
            margin: 18px 0 0;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .advice-list li {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            background: var(--bg-soft);
            border-radius: 14px;
            padding: 16px 20px;
            font-size: 14px;
            color: var(--text-primary);
            line-height: 1.7;
            border: 1px solid var(--border);
        }

        .advice-list li i {
            color: var(--primary);
            margin-top: 4px;
        }

        /* Scene Grid */
        .scene-grid {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 18px;
            margin-top: 20px;
        }

        .scene-card {
            background: var(--bg-soft);
            border-radius: 16px;
            padding: 22px 20px;
            border: 1px solid var(--border);
            transition: all 0.25s ease;
        }

        .scene-card:hover {
            border-color: rgba(244, 81, 30, 0.3);
            box-shadow: var(--shadow-sm);
        }

        .scene-card .scene-icon {
            font-size: 26px;
            margin-bottom: 10px;
        }

        .scene-card h3 {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 6px;
        }

        .scene-card p {
            font-size: 13px;
            color: var(--text-secondary);
            line-height: 1.65;
            margin: 0;
        }

        /* FAQ */
        .faq-block {
            background: var(--bg-soft);
            border-radius: var(--radius-lg);
            padding: 32px;
        }

        .faq-block .accordion-item {
            border: 1px solid var(--border);
            border-radius: 16px !important;
            margin-bottom: 14px;
            background: #fff;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all 0.3s ease;
        }

        .faq-block .accordion-item:last-child {
            margin-bottom: 0;
        }

        .faq-block .accordion-item:has(.accordion-button:not(.collapsed)) {
            border-color: rgba(244, 81, 30, 0.3);
            box-shadow: var(--shadow-lg);
        }

        .faq-block .accordion-button {
            font-size: 16px;
            font-weight: 700;
            color: var(--ink);
            background: #fff;
            padding: 20px 24px;
            padding-right: 60px;
            box-shadow: none;
            position: relative;
            border-radius: 16px !important;
        }

        .faq-block .accordion-button:not(.collapsed) {
            background: #fff;
            color: var(--ink);
        }

        .faq-block .accordion-button:hover {
            color: var(--primary);
        }

        .faq-block .accordion-button::after {
            content: "+";
            display: flex;
            align-items: center;
            justify-content: center;
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: rgba(244, 81, 30, 0.1);
            color: var(--primary);
            font-size: 18px;
            font-weight: 700;
            line-height: 1;
            background-image: none;
            position: absolute;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            transition: transform 0.3s ease, background 0.3s ease;
        }

        .faq-block .accordion-button:not(.collapsed)::after {
            transform: translateY(-50%) rotate(45deg);
            background: var(--brand-grad);
            color: #fff;
        }

        .faq-block .accordion-body {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.8;
            border-top: 1px solid var(--border);
            padding-top: 16px;
        }

        /* ===== Sidebar ===== */
        .side-card {
            background: #fff;
            border-radius: var(--radius-card);
            border: 1px solid var(--border);
            padding: 26px;
            box-shadow: var(--shadow-sm);
            margin-bottom: 24px;
        }

        .side-card h3 {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            margin-bottom: 20px;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--border);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .side-card h3 i {
            color: var(--primary);
        }

        .toc-list {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .toc-list a {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 9px 12px;
            border-radius: 10px;
            font-size: 14px;
            color: var(--text-secondary);
            transition: all 0.2s ease;
            border-left: 3px solid transparent;
        }

        .toc-list a::before {
            content: "\f105";
            font-family: "Font Awesome 6 Free";
            font-weight: 900;
            font-size: 12px;
            color: var(--primary);
        }

        .toc-list a:hover {
            color: var(--primary);
            background: rgba(244, 81, 30, 0.04);
            border-left-color: var(--primary);
        }

        .recommend-item {
            display: flex;
            gap: 14px;
            padding: 14px 0;
            border-bottom: 1px solid var(--border);
            transition: all 0.2s ease;
            align-items: center;
        }

        .recommend-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .recommend-item:hover .recommend-info h4 {
            color: var(--primary);
        }

        .recommend-thumb {
            flex-shrink: 0;
            width: 80px;
            height: 60px;
            border-radius: 10px;
            overflow: hidden;
            background: var(--bg-soft);
        }

        .recommend-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .recommend-info h4 {
            font-size: 14px;
            font-weight: 700;
            color: var(--ink);
            line-height: 1.5;
            margin-bottom: 4px;
            transition: color 0.2s ease;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .recommend-info p {
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
            display: -webkit-box;
            -webkit-line-clamp: 1;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* Sticky Sidebar */
        .sidebar-sticky {
            position: sticky;
            top: 96px;
        }

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

        .category-cta::before {
            content: "";
            position: absolute;
            top: -100px;
            right: 10%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(244, 81, 30, 0.4), transparent 70%);
            pointer-events: none;
        }

        .category-cta .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .category-cta h2 {
            color: #fff;
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 14px;
            letter-spacing: -0.015em;
        }

        .category-cta p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            max-width: 580px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }

        .cta-buttons {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 14px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--ink);
            position: relative;
        }

        .footer-gradient-bar {
            height: 4px;
            background: var(--brand-grad);
        }

        .footer-content {
            padding: 56px 0 36px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 2px;
            margin-bottom: 16px;
        }

        .footer-brand .brand-hth {
            font-size: 28px;
        }

        .footer-brand .brand-official {
            color: #fff;
            font-size: 20px;
        }

        .footer-desc {
            color: rgba(255, 255, 255, 0.5);
            font-size: 14px;
            line-height: 1.8;
            margin: 0;
            max-width: 320px;
        }

        .footer-title {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }

        .footer-links {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
            transition: all 0.2s ease;
        }

        .footer-links a i {
            font-size: 10px;
            color: var(--primary);
        }

        .footer-links a:hover {
            color: #FFB300;
        }

        .footer-contact {
            display: flex;
            align-items: center;
            gap: 12px;
            color: rgba(255, 255, 255, 0.65);
            font-size: 14px;
            margin-bottom: 14px;
        }

        .footer-contact i {
            color: var(--primary);
            font-size: 16px;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding: 22px 0;
            text-align: center;
            color: rgba(255, 255, 255, 0.45);
            font-size: 13px;
        }

        /* ===== Responsive ===== */
        @media (max-width: 991px) {
            .section-padding {
                padding: 64px 0;
            }

            .category-article {
                padding: 32px 28px 40px;
            }

            .sidebar-sticky {
                position: static;
                margin-top: 28px;
            }

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

            .category-hero-card {
                padding: 36px 32px;
            }

            .category-hero-title {
                font-size: 32px;
            }

            .navbar-collapse {
                padding: 16px 0;
                border-top: 1px solid var(--border);
                margin-top: 8px;
            }

            .navbar-nav {
                gap: 4px;
                margin-bottom: 14px;
            }

            .navbar-nav .nav-link {
                display: block;
                width: 100%;
                padding: 12px 16px !important;
                border-radius: 10px;
            }

            .navbar-nav .nav-link::after {
                display: none;
            }

            .navbar-nav .nav-link.active {
                background: rgba(244, 81, 30, 0.08);
            }

            .btn-brand-nav {
                margin-top: 4px;
                width: 100%;
            }
        }

        @media (max-width: 767px) {
            .section-padding {
                padding: 56px 0;
            }

            .category-hero {
                padding: 48px 0 40px;
            }

            .category-hero-card {
                padding: 28px 22px;
                border-radius: 18px;
            }

            .category-hero-title {
                font-size: 27px;
            }

            .category-hero-subtitle {
                font-size: 15px;
            }

            .category-hero-actions {
                flex-direction: column;
            }

            .category-hero-actions .btn {
                width: 100%;
            }

            .feature-strip {
                padding-top: 36px;
            }

            .feature-strip-card {
                padding: 22px 20px;
            }

            .category-main {
                padding: 36px 0 56px;
            }

            .category-article {
                padding: 24px 20px 32px;
                border-radius: 18px;
            }

            .category-section h2 {
                font-size: 22px;
            }

            .section-img {
                border-radius: 12px;
            }

            .step-item {
                flex-direction: column;
                gap: 10px;
            }

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

            .faq-block {
                padding: 20px;
            }

            .faq-block .accordion-button {
                font-size: 15px;
                padding: 18px 48px 18px 18px;
            }

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

            .category-cta h2 {
                font-size: 26px;
            }

            .cta-buttons {
                flex-direction: column;
                align-items: stretch;
                padding: 0 20px;
            }

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

            .footer-content {
                padding-top: 44px;
            }
        }

        @media (max-width: 576px) {
            .btn-brand-primary,
            .btn-brand-outline,
            .btn-brand-outline-light {
                padding: 14px 20px;
                font-size: 15px;
            }

            .category-hero-card {
                padding: 24px 18px;
            }

            .category-hero-badge {
                font-size: 12px;
                padding: 5px 12px;
            }

            .brand-official {
                font-size: 16px;
            }

            .brand-hth {
                font-size: 23px;
            }
        }