/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --bg-primary: #0b0f1a;
            --bg-secondary: #111827;
            --bg-card: #141c2c;
            --bg-card-hover: #1a2440;
            --bg-nav: rgba(11, 15, 26, 0.92);
            --color-neon: #00d4ff;
            --color-neon-glow: rgba(0, 212, 255, 0.35);
            --color-neon-dim: rgba(0, 212, 255, 0.12);
            --color-accent: #7c3aed;
            --color-accent-glow: rgba(124, 58, 237, 0.30);
            --color-orange: #f59e0b;
            --color-orange-glow: rgba(245, 158, 11, 0.25);
            --text-primary: #f0f4ff;
            --text-secondary: #94a3b8;
            --text-muted: #64748b;
            --border-color: rgba(0, 212, 255, 0.15);
            --border-glow: rgba(0, 212, 255, 0.30);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(0, 212, 255, 0.06);
            --shadow-card-hover: 0 12px 48px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(0, 212, 255, 0.18);
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.30s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --header-height: 72px;
            --container-max: 1200px;
            --container-pad: 24px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-primary);
            min-height: 100vh;
            overflow-x: hidden;
        }
        a {
            color: var(--color-neon);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: #80edff;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        p {
            color: var(--text-secondary);
            margin-bottom: 1em;
        }
        p:last-child {
            margin-bottom: 0;
        }
        ::selection {
            background: var(--color-neon);
            color: #0b0f1a;
        }
        :focus-visible {
            outline: 2px solid var(--color-neon);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--container-pad);
        }
        .container-narrow {
            max-width: 880px;
            margin: 0 auto;
            padding: 0 var(--container-pad);
        }
        .container-wide {
            max-width: 1360px;
            margin: 0 auto;
            padding: 0 var(--container-pad);
        }

        /* ===== Section ===== */
        section {
            padding: 80px 0;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            background: linear-gradient(135deg, var(--color-neon), var(--color-accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .section-subtitle {
            text-align: center;
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 680px;
            margin: 0 auto 48px auto;
            line-height: 1.7;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--color-neon), var(--color-accent));
            border-radius: 4px;
            margin: 16px auto 36px auto;
        }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-height);
            background: var(--bg-nav);
            backdrop-filter: blur(18px) saturate(1.3);
            -webkit-backdrop-filter: blur(18px) saturate(1.3);
            border-bottom: 1px solid rgba(0, 212, 255, 0.10);
            transition: var(--transition);
        }
        .header::after {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--color-neon), var(--color-accent), var(--color-orange), var(--color-neon));
            background-size: 300% 100%;
            animation: neonSlide 6s linear infinite;
        }
        @keyframes neonSlide {
            0% {
                background-position: 0% 0%;
            }
            100% {
                background-position: 300% 0%;
            }
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
            transition: var(--transition);
        }
        .logo i {
            color: var(--color-neon);
            font-size: 1.4rem;
            filter: drop-shadow(0 0 8px var(--color-neon-glow));
        }
        .logo span {
            background: linear-gradient(135deg, var(--color-neon), #80edff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            opacity: 0.85;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
            white-space: nowrap;
        }
        .nav a:hover {
            color: var(--color-neon);
            background: var(--color-neon-dim);
        }
        .nav a.active {
            color: var(--color-neon);
            background: var(--color-neon-dim);
            box-shadow: inset 0 -2px 0 var(--color-neon), 0 0 20px rgba(0, 212, 255, 0.08);
        }
        .nav-cta {
            background: transparent !important;
            border: 1.5px solid var(--color-neon) !important;
            color: var(--color-neon) !important;
            padding: 8px 24px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.06);
            transition: var(--transition);
            margin-left: 8px;
        }
        .nav-cta:hover {
            background: var(--color-neon) !important;
            color: #0b0f1a !important;
            box-shadow: 0 0 30px var(--color-neon-glow) !important;
            transform: scale(1.02);
        }
        .nav-toggle {
            display: none;
            background: none;
            color: var(--text-primary);
            font-size: 1.6rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-toggle:hover {
            background: var(--color-neon-dim);
            color: var(--color-neon);
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 100px 24px 60px;
            position: relative;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            isolation: isolate;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(11, 15, 26, 0.70) 0%, rgba(11, 15, 26, 0.88) 60%, var(--bg-primary) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 50% 30%, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 820px;
        }
        .hero-badge {
            display: inline-block;
            padding: 6px 20px;
            border-radius: 60px;
            background: rgba(0, 212, 255, 0.10);
            border: 1px solid rgba(0, 212, 255, 0.25);
            color: var(--color-neon);
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 24px;
            backdrop-filter: blur(6px);
        }
        .hero h1 {
            font-size: 3.6rem;
            font-weight: 900;
            line-height: 1.15;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 30%, var(--color-neon) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            color: var(--text-secondary);
            max-width: 620px;
            margin: 0 auto 36px auto;
            line-height: 1.8;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 34px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--color-neon);
            color: #0b0f1a;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.20);
        }
        .btn-primary:hover {
            background: #80edff;
            box-shadow: 0 0 48px rgba(0, 212, 255, 0.40);
            transform: translateY(-2px);
            color: #0b0f1a;
        }
        .btn-outline {
            background: transparent;
            color: var(--color-neon);
            border: 1.5px solid var(--color-neon);
            box-shadow: 0 0 12px rgba(0, 212, 255, 0.05);
        }
        .btn-outline:hover {
            background: var(--color-neon);
            color: #0b0f1a;
            box-shadow: 0 0 36px var(--color-neon-glow);
            transform: translateY(-2px);
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px 60px;
            margin-top: 48px;
            padding-top: 36px;
            border-top: 1px solid rgba(0, 212, 255, 0.08);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--color-neon);
            display: block;
            line-height: 1.2;
        }
        .hero-stat .label {
            font-size: 0.9rem;
            color: var(--text-muted);
            margin-top: 4px;
        }

        /* ===== Features / 优势 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
            margin-top: 12px;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-4px);
            background: var(--bg-card-hover);
        }
        .feature-card .icon-wrap {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: var(--color-neon-dim);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px auto;
            font-size: 1.6rem;
            color: var(--color-neon);
            transition: var(--transition);
        }
        .feature-card:hover .icon-wrap {
            background: rgba(0, 212, 255, 0.20);
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.12);
        }
        .feature-card h3 {
            font-size: 1.25rem;
            margin-bottom: 10px;
            color: var(--text-primary);
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== Categories / 分类入口 ===== */
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            min-height: 280px;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            padding: 28px 24px;
        }
        .category-card .cat-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
            object-fit: cover;
            width: 100%;
            height: 100%;
            opacity: 0.30;
            transition: var(--transition);
        }
        .category-card:hover .cat-bg {
            opacity: 0.45;
            transform: scale(1.04);
        }
        .category-card .cat-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(11, 15, 26, 0.92) 0%, rgba(11, 15, 26, 0.40) 100%);
            z-index: 1;
        }
        .category-card>*:not(.cat-bg):not(.cat-overlay) {
            position: relative;
            z-index: 2;
        }
        .category-card .cat-icon {
            font-size: 2rem;
            color: var(--color-neon);
            margin-bottom: 12px;
            filter: drop-shadow(0 0 12px var(--color-neon-glow));
        }
        .category-card h3 {
            font-size: 1.4rem;
            font-weight: 700;
            margin-bottom: 6px;
            color: #fff;
        }
        .category-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 16px;
        }
        .category-card .cat-link {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--color-neon);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .category-card .cat-link i {
            transition: var(--transition);
        }
        .category-card .cat-link:hover i {
            transform: translateX(4px);
        }
        .category-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }

        /* ===== Latest Posts / CMS ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
        }
        .post-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .post-card:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .post-card .post-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .post-card .post-body {
            padding: 20px 22px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-bottom: 8px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .post-card .post-meta .cat {
            color: var(--color-neon);
            font-weight: 600;
        }
        .post-card .post-meta .date {
            color: var(--text-muted);
        }
        .post-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .post-card h3 a {
            color: var(--text-primary);
            transition: var(--transition);
        }
        .post-card h3 a:hover {
            color: var(--color-neon);
        }
        .post-card p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            flex: 1;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .post-card .read-more {
            color: var(--color-neon);
            font-weight: 600;
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            align-self: flex-start;
        }
        .post-card .read-more i {
            transition: var(--transition);
        }
        .post-card .read-more:hover i {
            transform: translateX(4px);
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            font-size: 1.1rem;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        /* ===== Process / 流程 ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .process-step {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            position: relative;
        }
        .process-step:hover {
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .process-step .step-num {
            counter-increment: step;
            content: counter(step);
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--color-neon), var(--color-accent));
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 800;
            color: #0b0f1a;
            margin: 0 auto 16px auto;
            box-shadow: 0 0 24px rgba(0, 212, 255, 0.15);
        }
        .process-step h4 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            color: var(--text-primary);
        }
        .process-step p {
            font-size: 0.9rem;
            color: var(--text-secondary);
            margin-bottom: 0;
        }

        /* ===== 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-color);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--border-glow);
        }
        .faq-question {
            width: 100%;
            padding: 18px 24px;
            background: none;
            color: var(--text-primary);
            font-size: 1rem;
            font-weight: 600;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            transition: var(--transition);
        }
        .faq-question:hover {
            color: var(--color-neon);
        }
        .faq-question i {
            color: var(--color-neon);
            font-size: 0.9rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.40s ease, padding 0.30s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 320px;
            padding: 0 24px 20px 24px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, rgba(0, 212, 255, 0.04), rgba(124, 58, 237, 0.04));
            border-top: 1px solid var(--border-color);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            padding: 80px 24px;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
            background: linear-gradient(135deg, #fff, var(--color-neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .cta-section p {
            color: var(--text-secondary);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px auto;
        }
        .cta-section .btn {
            font-size: 1.05rem;
            padding: 16px 42px;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-secondary);
            border-top: 1px solid var(--border-color);
            padding: 48px 0 32px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 36px;
        }
        .footer-brand .logo {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            padding: 4px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--color-neon);
            padding-left: 4px;
        }
        .footer-bottom {
            border-top: 1px solid rgba(0, 212, 255, 0.06);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .footer-bottom a {
            color: var(--text-muted);
        }
        .footer-bottom a:hover {
            color: var(--color-neon);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero h1 {
                font-size: 2.8rem;
            }
            .section-title {
                font-size: 1.9rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-stats {
                gap: 28px 40px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-height: 64px;
                --container-pad: 18px;
            }
            section {
                padding: 56px 0;
            }
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: var(--bg-nav);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 18px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                transition: var(--transition);
                pointer-events: none;
                box-shadow: 0 24px 48px rgba(0, 0, 0, 0.6);
            }
            .nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav a {
                width: 100%;
                padding: 12px 18px;
                font-size: 1rem;
            }
            .nav-cta {
                margin-left: 0;
                margin-top: 6px;
                text-align: center;
                justify-content: center;
            }
            .nav-toggle {
                display: block;
            }
            .hero {
                min-height: 90vh;
                padding: 80px 18px 40px;
            }
            .hero h1 {
                font-size: 2.0rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero-stats {
                gap: 20px 30px;
                margin-top: 32px;
                padding-top: 24px;
            }
            .hero-stat .num {
                font-size: 1.6rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-subtitle {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }
            .features-grid,
            .categories-grid,
            .posts-grid {
                grid-template-columns: 1fr;
            }
            .process-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.6rem;
            }
            .faq-question {
                font-size: 0.95rem;
                padding: 14px 18px;
            }
        }
        @media (max-width: 520px) {
            :root {
                --container-pad: 14px;
            }
            section {
                padding: 40px 0;
            }
            .hero h1 {
                font-size: 1.6rem;
            }
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .hero-stat .num {
                font-size: 1.3rem;
            }
            .process-grid {
                grid-template-columns: 1fr;
            }
            .btn {
                padding: 12px 24px;
                font-size: 0.95rem;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo i {
                font-size: 1.1rem;
            }
            .feature-card {
                padding: 24px 18px;
            }
            .post-card .post-body {
                padding: 16px 16px 20px;
            }
            .category-card {
                min-height: 220px;
                padding: 20px 18px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-12 {
            margin-top: 12px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-36 {
            margin-top: 36px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #00d4ff;
            --primary-dark: #0a8cff;
            --primary-glow: rgba(0, 212, 255, 0.25);
            --secondary: #8b5cf6;
            --secondary-glow: rgba(139, 92, 246, 0.2);
            --accent: #00ff88;
            --accent-glow: rgba(0, 255, 136, 0.2);
            --bg-deep: #070b14;
            --bg-dark: #0a0e17;
            --bg-card: #111827;
            --bg-card-hover: #1a1f2e;
            --bg-surface: #1e2433;
            --text-light: #f0f4ff;
            --text-muted: #9aa8c7;
            --text-dim: #6b7b9c;
            --border-glow: rgba(0, 212, 255, 0.12);
            --border-card: rgba(255, 255, 255, 0.06);
            --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5), 0 0 0 1px rgba(0, 212, 255, 0.05);
            --shadow-glow: 0 0 20px rgba(0, 212, 255, 0.08);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset / Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text-light);
            background: var(--bg-deep);
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-light);
        }
        ::selection {
            background: var(--primary);
            color: #000;
        }
        :focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        /* ===== Header / 导航 ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(7, 11, 20, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-glow);
            z-index: 1000;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-light);
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: 0.5px;
            transition: color var(--transition);
        }
        .logo i {
            font-size: 1.6rem;
            color: var(--primary);
            filter: drop-shadow(0 0 8px var(--primary-glow));
        }
        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            color: var(--primary);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }
        .nav a {
            position: relative;
            color: var(--text-muted);
            font-size: 0.92rem;
            font-weight: 500;
            padding: 6px 2px;
            transition: color var(--transition), text-shadow var(--transition);
        }
        .nav a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            box-shadow: 0 0 12px var(--primary-glow);
            transition: width var(--transition);
            border-radius: 2px;
        }
        .nav a:hover {
            color: var(--text-light);
            text-shadow: 0 0 12px rgba(0, 212, 255, 0.2);
        }
        .nav a:hover::after {
            width: 100%;
        }
        .nav a.active {
            color: var(--primary);
            text-shadow: 0 0 20px var(--primary-glow);
        }
        .nav a.active::after {
            width: 100%;
            background: var(--primary);
            box-shadow: 0 0 16px var(--primary-glow);
        }
        .nav .nav-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 22px;
            border-radius: 40px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .nav .nav-cta::after {
            display: none;
        }
        .nav .nav-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 36px rgba(0, 212, 255, 0.35);
            color: #fff;
        }
        .nav .nav-cta i {
            font-size: 0.8rem;
            transition: transform var(--transition);
        }
        .nav .nav-cta:hover i {
            transform: translateX(4px);
        }
        .nav-toggle {
            display: none;
            background: transparent;
            color: var(--text-light);
            font-size: 1.6rem;
            padding: 4px 8px;
            cursor: pointer;
            border-radius: var(--radius-sm);
            transition: color var(--transition);
        }
        .nav-toggle:hover {
            color: var(--primary);
        }

        /* ===== 页面 Banner ===== */
        .page-banner {
            padding: 140px 0 80px;
            background: linear-gradient(135deg, var(--bg-deep) 0%, #101827 50%, var(--bg-deep) 100%);
            position: relative;
            overflow: hidden;
            border-bottom: 1px solid var(--border-glow);
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.08;
            pointer-events: none;
        }
        .page-banner::after {
            content: '';
            position: absolute;
            top: -40%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 212, 255, 0.06) 0%, transparent 70%);
            pointer-events: none;
        }
        .page-banner .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .page-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, var(--text-light) 30%, var(--primary) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 18px;
        }
        .page-banner p {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 680px;
            margin: 0 auto;
            line-height: 1.7;
        }
        .page-banner .badge-group {
            display: flex;
            justify-content: center;
            gap: 12px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .page-banner .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 18px;
            border-radius: 40px;
            background: rgba(0, 212, 255, 0.08);
            border: 1px solid var(--border-glow);
            color: var(--text-muted);
            font-size: 0.85rem;
            font-weight: 500;
        }
        .page-banner .badge i {
            color: var(--primary);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: 90px 0;
            position: relative;
        }
        .section-title {
            font-size: 2.2rem;
            font-weight: 700;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-sub {
            text-align: center;
            color: var(--text-muted);
            max-width: 620px;
            margin: 0 auto 56px;
            font-size: 1.05rem;
        }
        .section-divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            border-radius: 4px;
            margin: 0 auto 40px;
            box-shadow: 0 0 20px var(--primary-glow);
        }

        /* ===== 平台概览 ===== */
        .overview-section {
            background: var(--bg-dark);
        }
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }
        .overview-content h2 {
            font-size: 1.9rem;
            margin-bottom: 20px;
        }
        .overview-content h2 span {
            color: var(--primary);
        }
        .overview-content p {
            color: var(--text-muted);
            margin-bottom: 18px;
            font-size: 1rem;
            line-height: 1.8;
        }
        .overview-content .feature-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px 24px;
            margin-top: 24px;
        }
        .overview-content .feature-list li {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-muted);
            font-size: 0.95rem;
        }
        .overview-content .feature-list li i {
            color: var(--accent);
            font-size: 0.85rem;
        }
        .overview-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-card);
            position: relative;
        }
        .overview-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .overview-image:hover img {
            transform: scale(1.02);
        }

        /* ===== 核心功能卡片 ===== */
        .features-section {
            background: var(--bg-deep);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            padding: 36px 28px 30px;
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            position: relative;
            overflow: hidden;
        }
        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--secondary));
            opacity: 0;
            transition: opacity var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card), var(--shadow-glow);
            border-color: rgba(0, 212, 255, 0.15);
        }
        .feature-card:hover::before {
            opacity: 1;
        }
        .feature-card .icon {
            width: 54px;
            height: 54px;
            border-radius: var(--radius-sm);
            background: rgba(0, 212, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: 20px;
            transition: background var(--transition), box-shadow var(--transition);
        }
        .feature-card:hover .icon {
            background: rgba(0, 212, 255, 0.15);
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.1);
        }
        .feature-card h3 {
            font-size: 1.2rem;
            margin-bottom: 12px;
            font-weight: 600;
        }
        .feature-card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== 使用流程 ===== */
        .steps-section {
            background: var(--bg-dark);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            padding: 32px 24px 28px;
            text-align: center;
            position: relative;
            transition: transform var(--transition), box-shadow var(--transition);
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .step-card .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-weight: 700;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            box-shadow: 0 0 20px rgba(0, 212, 255, 0.15);
        }
        .step-card h3 {
            font-size: 1.1rem;
            margin-bottom: 10px;
            font-weight: 600;
        }
        .step-card p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.65;
        }
        .step-card .step-arrow {
            position: absolute;
            top: 50%;
            right: -16px;
            transform: translateY(-50%);
            color: var(--primary);
            font-size: 1.2rem;
            opacity: 0.4;
            pointer-events: none;
        }
        .steps-grid .step-card:last-child .step-arrow {
            display: none;
        }

        /* ===== 数据统计 ===== */
        .stats-section {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-glow);
            border-bottom: 1px solid var(--border-glow);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
            text-align: center;
        }
        .stat-item {
            padding: 20px 12px;
        }
        .stat-item .number {
            font-size: 2.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }
        .stat-item .label {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 6px;
            font-weight: 500;
        }
        .stat-item .desc {
            color: var(--text-dim);
            font-size: 0.82rem;
            margin-top: 4px;
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-dark);
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(0, 212, 255, 0.12);
        }
        .faq-question {
            width: 100%;
            padding: 20px 28px;
            background: transparent;
            color: var(--text-light);
            font-size: 1rem;
            font-weight: 600;
            text-align: left;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            transition: color var(--transition);
        }
        .faq-question:hover {
            color: var(--primary);
        }
        .faq-question i {
            font-size: 0.85rem;
            color: var(--primary);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            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 28px;
            color: var(--text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 28px 22px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-deep) 0%, #0f1a2e 100%);
            padding: 80px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
            border-top: 1px solid var(--border-glow);
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.05;
            pointer-events: none;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
        }
        .cta-section h2 {
            font-size: 2.2rem;
            margin-bottom: 16px;
        }
        .cta-section p {
            color: var(--text-muted);
            max-width: 540px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 40px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            box-shadow: 0 0 30px rgba(0, 212, 255, 0.2);
            transition: transform var(--transition), box-shadow var(--transition);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }
        .btn-primary:hover {
            transform: translateY(-3px) scale(1.02);
            box-shadow: 0 0 50px rgba(0, 212, 255, 0.35);
            color: #fff;
        }
        .btn-primary i {
            font-size: 0.9rem;
            transition: transform var(--transition);
        }
        .btn-primary:hover i {
            transform: translateX(4px);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 40px;
            background: transparent;
            color: var(--text-light);
            font-weight: 600;
            font-size: 1rem;
            border: 1px solid rgba(255, 255, 255, 0.12);
            transition: background var(--transition), border-color var(--transition), transform var(--transition);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.04);
            border-color: var(--primary);
            transform: translateY(-3px);
            color: var(--text-light);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            border-top: 1px solid var(--border-glow);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 48px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            font-size: 1.2rem;
            margin-bottom: 16px;
        }
        .footer-brand p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 600;
            margin-bottom: 18px;
            color: var(--text-light);
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.88rem;
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
            padding-left: 6px;
        }
        .footer-bottom {
            border-top: 1px solid var(--border-glow);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            color: var(--text-dim);
            font-size: 0.82rem;
        }
        .footer-bottom a {
            color: var(--text-dim);
            transition: color var(--transition);
        }
        .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .overview-grid {
                gap: 40px;
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid .step-card:nth-child(2) .step-arrow {
                display: none;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .page-banner h1 {
                font-size: 2.4rem;
            }
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 18px;
            }
            .nav {
                display: none;
                position: absolute;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(7, 11, 20, 0.98);
                backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 20px 24px 30px;
                gap: 6px;
                border-bottom: 1px solid var(--border-glow);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
            }
            .nav.open {
                display: flex;
            }
            .nav a {
                padding: 12px 16px;
                font-size: 1rem;
                border-radius: var(--radius-sm);
                width: 100%;
            }
            .nav a::after {
                display: none;
            }
            .nav a.active {
                background: rgba(0, 212, 255, 0.06);
                border-left: 3px solid var(--primary);
                padding-left: 13px;
            }
            .nav .nav-cta {
                margin-top: 8px;
                justify-content: center;
                width: 100%;
            }
            .nav-toggle {
                display: block;
            }
            .page-banner {
                padding: 120px 0 56px;
            }
            .page-banner h1 {
                font-size: 1.9rem;
            }
            .page-banner p {
                font-size: 1rem;
            }
            .section {
                padding: 60px 0;
            }
            .section-title {
                font-size: 1.7rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 36px;
            }
            .overview-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .overview-content .feature-list {
                grid-template-columns: 1fr;
            }
            .overview-image {
                order: -1;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .steps-grid .step-card .step-arrow {
                display: none;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .stat-item .number {
                font-size: 2rem;
            }
            .faq-question {
                padding: 16px 20px;
                font-size: 0.95rem;
            }
            .faq-answer {
                padding: 0 20px;
                font-size: 0.9rem;
            }
            .faq-item.active .faq-answer {
                padding: 0 20px 18px;
            }
            .cta-section h2 {
                font-size: 1.7rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .page-banner h1 {
                font-size: 1.6rem;
            }
            .page-banner .badge-group {
                flex-direction: column;
                align-items: center;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .stat-item .number {
                font-size: 1.7rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }
            .section-title {
                font-size: 1.4rem;
            }
        }

        /* ===== 滚动条美化 ===== */
        ::-webkit-scrollbar {
            width: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-deep);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--bg-surface);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-dim);
        }

        /* ===== 其他辅助 ===== */
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .glow-line {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--primary), transparent);
            opacity: 0.15;
            margin: 0;
        }

/* roulang page: article */
:root {
    --primary: #00d4ff;
    --primary-dim: #0099cc;
    --primary-glow: rgba(0, 212, 255, 0.25);
    --accent: #ff6b35;
    --accent-glow: rgba(255, 107, 53, 0.25);
    --bg-body: #0a0e17;
    --bg-card: #111a28;
    --bg-elevated: #182233;
    --bg-section: #0d1420;
    --text: #e8edf5;
    --text-dim: #7a8a9e;
    --text-muted: #4a5a6e;
    --border: #1e2d42;
    --border-glow: rgba(0, 212, 255, 0.12);
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.06);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --max-w: 1200px;
    --content-w: 800px;
    --header-h: 72px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font);background:var(--bg-body);color:var(--text);line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius-sm)}
ul,ol{list-style:none}
button,input,textarea{font:inherit;color:inherit;border:none;outline:none;background:transparent}
.container{width:100%;max-width:var(--max-w);margin:0 auto;padding:0 24px}
@media(max-width:768px){.container{padding:0 16px}}

/* ===== Header ===== */
.header{position:fixed;top:0;left:0;width:100%;height:var(--header-h);background:rgba(10,14,23,.88);backdrop-filter:blur(16px);border-bottom:1px solid var(--border);z-index:1000;transition:var(--transition)}
.header .container{display:flex;align-items:center;justify-content:space-between;height:100%}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1.35rem;letter-spacing:-0.3px}
.logo i{color:var(--primary);font-size:1.6rem;filter:drop-shadow(0 0 8px var(--primary-glow))}
.logo span{background:linear-gradient(135deg,var(--primary),#66f);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.logo:hover{opacity:.9}
.nav{display:flex;align-items:center;gap:8px}
.nav a{position:relative;padding:8px 16px;border-radius:var(--radius-sm);font-size:.92rem;font-weight:500;color:var(--text-dim);transition:var(--transition)}
.nav a::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:0;height:2px;background:var(--primary);border-radius:2px;box-shadow:0 0 12px var(--primary-glow);transition:var(--transition)}
.nav a:hover{color:var(--text)}
.nav a:hover::after{width:60%}
.nav a.active{color:var(--primary);text-shadow:0 0 20px var(--primary-glow)}
.nav a.active::after{width:80%;background:var(--primary);box-shadow:0 0 20px var(--primary-glow)}
.nav-cta{background:linear-gradient(135deg,var(--primary),#44aaff)!important;color:#0a0e17!important;font-weight:600!important;padding:8px 22px!important;border-radius:50px!important;box-shadow:0 4px 20px var(--primary-glow);transition:var(--transition)!important}
.nav-cta i{margin-right:6px}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 8px 32px var(--primary-glow)!important;color:#0a0e17!important}
.nav-cta::after{display:none!important}
.nav-toggle{display:none;font-size:1.5rem;color:var(--text);padding:8px;cursor:pointer;background:none;border:none}
@media(max-width:900px){
    .nav{position:fixed;top:var(--header-h);left:0;width:100%;flex-direction:column;background:rgba(10,14,23,.98);backdrop-filter:blur(20px);padding:16px 24px 24px;gap:4px;border-bottom:1px solid var(--border);transform:translateY(-120%);opacity:0;pointer-events:none;transition:var(--transition)}
    .nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
    .nav a{width:100%;padding:12px 16px;border-radius:var(--radius-sm)}
    .nav a::after{display:none}
    .nav a.active{background:rgba(0,212,255,.08);border-left:3px solid var(--primary);padding-left:13px}
    .nav-cta{margin-top:8px;text-align:center}
    .nav-toggle{display:block}
}

/* ===== Hero / Banner ===== */
.article-hero{position:relative;margin-top:var(--header-h);padding:100px 0 80px;background:var(--bg-section);overflow:hidden}
.article-hero-bg{position:absolute;inset:0;background:url('/assets/images/backpic/back-1.png') center/cover no-repeat;opacity:.15;filter:blur(2px)}
.article-hero-bg::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,14,17,.7) 0%,rgba(10,14,17,.95) 100%)}
.article-hero .container{position:relative;z-index:2}
.article-hero .breadcrumb{display:flex;flex-wrap:wrap;gap:6px 16px;margin-bottom:24px;font-size:.85rem;color:var(--text-dim)}
.article-hero .breadcrumb a{color:var(--text-dim)}
.article-hero .breadcrumb a:hover{color:var(--primary)}
.article-hero .breadcrumb span{color:var(--text-muted)}
.article-hero .cat-badge{display:inline-block;padding:4px 16px;border-radius:50px;font-size:.78rem;font-weight:600;background:rgba(0,212,255,.12);color:var(--primary);border:1px solid rgba(0,212,255,.2);margin-bottom:16px;letter-spacing:.3px}
.article-hero h1{font-size:clamp(1.6rem,4vw,2.6rem);font-weight:800;line-height:1.25;margin-bottom:20px;letter-spacing:-.5px;background:linear-gradient(135deg,#fff,var(--primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.article-hero .meta{display:flex;flex-wrap:wrap;gap:12px 24px;font-size:.9rem;color:var(--text-dim)}
.article-hero .meta i{margin-right:6px;color:var(--primary)}
@media(max-width:768px){
    .article-hero{padding:70px 0 50px}
    .article-hero h1{font-size:1.5rem}
}

/* ===== Main Content ===== */
.article-main{padding:60px 0 80px;background:var(--bg-body)}
.article-layout{display:grid;grid-template-columns:1fr 300px;gap:48px;align-items:start}
@media(max-width:1024px){.article-layout{grid-template-columns:1fr;gap:32px}}
.article-body{background:var(--bg-card);border-radius:var(--radius);padding:40px 48px;border:1px solid var(--border);box-shadow:var(--shadow)}
@media(max-width:768px){.article-body{padding:24px 20px}}
.article-body .featured-image{margin:-40px -48px 32px;border-radius:var(--radius) var(--radius) 0 0;overflow:hidden;max-height:480px;object-fit:cover;width:calc(100% + 88px)}
@media(max-width:768px){.article-body .featured-image{margin:-24px -20px 20px;width:calc(100% + 40px)}}
.article-body .content{font-size:1.05rem;line-height:1.85;color:var(--text)}
.article-body .content p{margin-bottom:1.5em}
.article-body .content h2,.article-body .content h3{font-weight:700;margin-top:2em;margin-bottom:.8em;color:#fff;line-height:1.3}
.article-body .content h2{font-size:1.5rem;border-left:4px solid var(--primary);padding-left:16px}
.article-body .content h3{font-size:1.2rem}
.article-body .content ul,.article-body .content ol{padding-left:24px;margin-bottom:1.5em}
.article-body .content li{margin-bottom:.5em;list-style:disc}
.article-body .content ol li{list-style:decimal}
.article-body .content img{border-radius:var(--radius-sm);margin:1.5em 0;box-shadow:var(--shadow)}
.article-body .content blockquote{border-left:4px solid var(--primary);background:rgba(0,212,255,.05);padding:16px 24px;margin:1.5em 0;border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-dim);font-style:italic}
.article-body .content a{color:var(--primary);border-bottom:1px solid rgba(0,212,255,.3)}
.article-body .content a:hover{border-bottom-color:var(--primary)}
.article-body .content code{background:var(--bg-elevated);padding:2px 8px;border-radius:4px;font-size:.9em;color:var(--accent)}
.article-not-found{text-align:center;padding:80px 20px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border)}
.article-not-found i{font-size:3rem;color:var(--text-muted);margin-bottom:16px}
.article-not-found h2{font-size:1.6rem;margin-bottom:12px;color:var(--text)}
.article-not-found p{color:var(--text-dim);margin-bottom:24px}
.article-not-found .btn{display:inline-flex;align-items:center;gap:8px}

/* ===== Sidebar ===== */
.article-sidebar{display:flex;flex-direction:column;gap:28px}
.sidebar-card{background:var(--bg-card);border-radius:var(--radius);padding:28px 24px;border:1px solid var(--border);box-shadow:var(--shadow)}
.sidebar-card h3{font-size:1.1rem;font-weight:700;margin-bottom:18px;color:#fff;padding-bottom:12px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:8px}
.sidebar-card h3 i{color:var(--primary)}
.sidebar-list li{padding:10px 0;border-bottom:1px solid rgba(30,45,66,.5)}
.sidebar-list li:last-child{border-bottom:none}
.sidebar-list a{color:var(--text-dim);font-size:.92rem;display:flex;align-items:flex-start;gap:8px;transition:var(--transition)}
.sidebar-list a:hover{color:var(--primary);transform:translateX(4px)}
.sidebar-list .date{font-size:.78rem;color:var(--text-muted);margin-top:2px}
.sidebar-tags{display:flex;flex-wrap:wrap;gap:8px}
.sidebar-tags a{padding:4px 14px;border-radius:50px;font-size:.8rem;background:rgba(0,212,255,.06);color:var(--text-dim);border:1px solid var(--border);transition:var(--transition)}
.sidebar-tags a:hover{background:rgba(0,212,255,.12);color:var(--primary);border-color:rgba(0,212,255,.2)}

/* ===== Post Navigation ===== */
.post-nav{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:48px}
@media(max-width:600px){.post-nav{grid-template-columns:1fr}}
.post-nav a{display:flex;flex-direction:column;gap:6px;padding:20px 24px;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);transition:var(--transition)}
.post-nav a:hover{border-color:rgba(0,212,255,.2);transform:translateY(-2px);box-shadow:var(--shadow-glow)}
.post-nav .label{font-size:.78rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}
.post-nav .title{font-weight:600;color:var(--text);font-size:.95rem;line-height:1.4}
.post-nav a:hover .title{color:var(--primary)}
.post-nav .next{text-align:right}

/* ===== Related ===== */
.related-section{padding:60px 0;background:var(--bg-section)}
.related-section .section-title{text-align:center;margin-bottom:40px}
.related-section .section-title h2{font-size:1.8rem;font-weight:700;color:#fff}
.related-section .section-title p{color:var(--text-dim);margin-top:8px;font-size:.95rem}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
@media(max-width:900px){.related-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:600px){.related-grid{grid-template-columns:1fr}}
.related-card{background:var(--bg-card);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:var(--transition)}
.related-card:hover{transform:translateY(-4px);border-color:rgba(0,212,255,.2);box-shadow:var(--shadow-glow)}
.related-card img{width:100%;height:180px;object-fit:cover;border-radius:0}
.related-card .info{padding:20px}
.related-card .info .cat{font-size:.75rem;color:var(--primary);font-weight:600;text-transform:uppercase;letter-spacing:.3px}
.related-card .info h3{font-size:1rem;font-weight:600;margin:8px 0;color:var(--text);line-height:1.4}
.related-card .info h3 a{color:inherit}
.related-card .info h3 a:hover{color:var(--primary)}
.related-card .info .time{font-size:.8rem;color:var(--text-muted)}

/* ===== CTA ===== */
.cta-section{padding:80px 0;background:var(--bg-section);position:relative;overflow:hidden}
.cta-section::before{content:'';position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:.08;filter:blur(4px)}
.cta-box{position:relative;z-index:2;text-align:center;max-width:680px;margin:0 auto;background:var(--bg-card);border-radius:var(--radius);padding:56px 48px;border:1px solid var(--border);box-shadow:var(--shadow)}
@media(max-width:768px){.cta-box{padding:36px 24px}}
.cta-box h2{font-size:1.6rem;font-weight:700;margin-bottom:12px;color:#fff}
.cta-box p{color:var(--text-dim);margin-bottom:28px;font-size:.95rem}
.cta-box .btn-group{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 32px;border-radius:50px;font-weight:600;font-size:.95rem;cursor:pointer;transition:var(--transition);border:none}
.btn-primary{background:linear-gradient(135deg,var(--primary),#44aaff);color:#0a0e17;box-shadow:0 4px 24px var(--primary-glow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 40px var(--primary-glow);color:#0a0e17}
.btn-outline{background:transparent;color:var(--text);border:1px solid var(--border)}
.btn-outline:hover{background:rgba(0,212,255,.06);border-color:var(--primary);color:var(--primary)}

/* ===== Comments ===== */
.comments-section{padding:60px 0 80px;background:var(--bg-body)}
.comments-box{background:var(--bg-card);border-radius:var(--radius);padding:40px 48px;border:1px solid var(--border);box-shadow:var(--shadow)}
@media(max-width:768px){.comments-box{padding:24px 20px}}
.comments-box h3{font-size:1.2rem;font-weight:700;margin-bottom:24px;color:#fff;display:flex;align-items:center;gap:8px}
.comments-box h3 i{color:var(--primary)}
.comment-form .form-group{margin-bottom:16px}
.comment-form textarea{width:100%;padding:14px 18px;border-radius:var(--radius-sm);background:var(--bg-elevated);border:1px solid var(--border);color:var(--text);font-size:.95rem;resize:vertical;min-height:120px;transition:var(--transition)}
.comment-form textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-glow)}
.comment-form .btn{padding:10px 28px;font-size:.9rem}

/* ===== Footer ===== */
.footer{background:var(--bg-section);border-top:1px solid var(--border);padding:60px 0 30px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:40px}
@media(max-width:900px){.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:600px){.footer-grid{grid-template-columns:1fr}}
.footer-brand .logo{margin-bottom:12px}
.footer-brand p{font-size:.88rem;color:var(--text-dim);line-height:1.7;max-width:360px}
.footer-col h4{font-size:.95rem;font-weight:700;color:#fff;margin-bottom:16px;letter-spacing:.3px}
.footer-col a{display:block;padding:5px 0;font-size:.88rem;color:var(--text-dim);transition:var(--transition)}
.footer-col a:hover{color:var(--primary);transform:translateX(4px)}
.footer-bottom{border-top:1px solid var(--border);padding-top:20px;display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;font-size:.82rem;color:var(--text-muted)}
.footer-bottom a{color:var(--text-muted)}
.footer-bottom a:hover{color:var(--primary)}
@media(max-width:600px){.footer-bottom{flex-direction:column;text-align:center}}

/* ===== Scrollbar ===== */
::-webkit-scrollbar{width:6px}
::-webkit-scrollbar-track{background:var(--bg-body)}
::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}
::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}

/* ===== Animations ===== */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.animate-fade-up{animation:fadeUp .6s ease-out both}
.animate-fade-up.delay-1{animation-delay:.1s}
.animate-fade-up.delay-2{animation-delay:.2s}