/* roulang page: index */
:root {
            --bg: #060B16;
            --panel: #0D1524;
            --glass-bg: rgba(17, 25, 40, 0.6);
            --glass-border: rgba(255, 255, 255, 0.08);
            --primary: #267BFF;
            --neon: #00E5FF;
            --accent: #7C5CFF;
            --success: #00D68F;
            --danger: #FF4D4F;
            --star: #FFC53D;
            --text-main: #F0F4F8;
            --text-sub: #9AA7B8;
            --text-faint: #64748B;
            --radius-card: 20px;
            --radius-btn: 12px;
            --shadow-glow: 0 0 12px rgba(38, 123, 255, 0.35);
            --shadow-glow-lg: 0 0 28px rgba(38, 123, 255, 0.55);
            --shadow-neon: 0 0 16px rgba(0, 229, 255, 0.35);
            --transition: 0.3s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "HarmonicOS Sans SC", "Helvetica Neue", sans-serif;
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.75;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

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

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

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section-pad {
            padding: 96px 0;
        }

        @media (max-width: 768px) {
            .section-pad {
                padding: 64px 0;
            }
            .container-custom {
                padding: 0 16px;
            }
        }

        .glass {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
        }

        .grid-bg {
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 44px 44px;
        }

        .text-gradient {
            background: linear-gradient(135deg, #267BFF 0%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: linear-gradient(135deg, #267BFF, #1E5FFF);
            color: #fff;
            font-weight: 600;
            font-size: 15px;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            box-shadow: var(--shadow-glow);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .btn-primary:hover {
            box-shadow: var(--shadow-glow-lg);
            transform: translateY(-2px);
        }

        .btn-primary:active {
            transform: scale(0.97);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.04);
            color: var(--text-main);
            font-weight: 500;
            font-size: 15px;
            padding: 12px 26px;
            border-radius: var(--radius-btn);
            border: 1px solid rgba(255, 255, 255, 0.14);
            transition: all var(--transition);
            white-space: nowrap;
        }

        .btn-outline:hover {
            border-color: var(--primary);
            background: rgba(38, 123, 255, 0.1);
            transform: translateY(-2px);
        }

        .btn-outline:active {
            transform: scale(0.97);
        }

        .nav-card {
            background: rgba(13, 21, 36, 0.85);
            backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
            border-radius: 16px;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid transparent;
            transition: all var(--transition);
        }

        .nav-link:hover {
            color: var(--text-main);
            background: rgba(38, 123, 255, 0.12);
            border-color: rgba(38, 123, 255, 0.3);
            box-shadow: 0 0 12px rgba(38, 123, 255, 0.15);
        }

        .nav-link.active {
            color: #00E5FF;
            border-color: rgba(0, 229, 255, 0.35);
            background: rgba(0, 229, 255, 0.08);
            box-shadow: 0 0 14px rgba(0, 229, 255, 0.15);
        }

        .input-field {
            width: 100%;
            height: 50px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.12);
            border-radius: var(--radius-btn);
            padding: 0 16px;
            color: var(--text-main);
            font-size: 15px;
            transition: all var(--transition);
            outline: none;
        }

        .input-field::placeholder {
            color: var(--text-faint);
        }

        .input-field:focus {
            border-color: var(--neon);
            box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12), 0 0 16px rgba(0, 229, 255, 0.15);
            background: rgba(255, 255, 255, 0.07);
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            font-size: 13px;
            line-height: 1.6;
            border-radius: 999px;
            background: rgba(38, 123, 255, 0.15);
            color: #9DBFFF;
            border: 1px solid rgba(38, 123, 255, 0.25);
        }

        .section-title {
            font-size: 36px;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.5px;
            color: var(--text-main);
        }

        .section-subtitle {
            font-size: 16px;
            color: var(--text-sub);
            line-height: 1.8;
            max-width: 640px;
        }

        @media (max-width: 768px) {
            .section-title {
                font-size: 26px;
            }
        }

        .stat-card {
            position: relative;
            text-align: center;
            padding: 32px 16px;
        }

        .stat-card::after {
            content: '';
            display: block;
            width: 40px;
            height: 3px;
            background: linear-gradient(90deg, var(--primary), var(--neon));
            border-radius: 4px;
            margin: 0 auto;
            margin-top: 12px;
        }

        .stat-number {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -1px;
        }

        @media (max-width: 640px) {
            .stat-number {
                font-size: 32px;
            }
        }

        .testimonial-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            padding: 28px;
            transition: all var(--transition);
            height: 100%;
        }

        .testimonial-card:hover {
            border-color: rgba(38, 123, 255, 0.35);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }

        .testimonial-card.featured {
            background: linear-gradient(160deg, rgba(38, 123, 255, 0.12), rgba(0, 229, 255, 0.05), rgba(17, 25, 40, 0.6));
            border-color: rgba(38, 123, 255, 0.3);
        }

        .avatar-circle {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 16px;
            color: #fff;
            flex-shrink: 0;
        }

        .news-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: 16px;
            transition: all var(--transition);
            overflow: hidden;
        }

        .news-card:hover {
            border-color: rgba(38, 123, 255, 0.35);
            box-shadow: 0 6px 24px rgba(38, 123, 255, 0.08);
            transform: translateY(-2px);
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

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

        .faq-question {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 4px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-main);
            text-align: left;
            transition: color var(--transition);
        }

        .faq-question:hover {
            color: var(--neon);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(38, 123, 255, 0.12);
            color: var(--primary);
            font-size: 16px;
            transition: transform 0.35s ease, background 0.3s ease;
            flex-shrink: 0;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            background: rgba(0, 229, 255, 0.12);
            color: var(--neon);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            padding: 0 4px;
            color: var(--text-sub);
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            max-height: 500px;
            padding-bottom: 20px;
        }

        .footer-link {
            color: var(--text-sub);
            font-size: 14px;
            transition: color var(--transition);
            line-height: 2.2;
        }

        .footer-link:hover {
            color: var(--neon);
        }

        .section-head {
            margin-bottom: 48px;
        }

        @media (max-width: 768px) {
            .section-head {
                margin-bottom: 32px;
            }
        }

        .mobile-menu {
            display: none;
            position: absolute;
            top: calc(100% + 8px);
            left: 16px;
            right: 16px;
            background: rgba(13, 21, 36, 0.97);
            border: 1px solid var(--glass-border);
            border-radius: 16px;
            padding: 16px;
            backdrop-filter: blur(20px);
            z-index: 100;
        }

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

        .login-tab {
            flex: 1;
            text-align: center;
            padding: 10px 0;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            transition: all var(--transition);
        }

        .login-tab.active {
            background: rgba(38, 123, 255, 0.15);
            color: var(--text-main);
            box-shadow: 0 0 8px rgba(38, 123, 255, 0.15);
        }

        .hero-background {
            background-image: linear-gradient(rgba(6, 11, 22, 0.88), rgba(6, 11, 22, 0.94)),
                url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
        }

        .cta-background {
            background-image: linear-gradient(rgba(6, 11, 22, 0.85), rgba(6, 11, 22, 0.92)),
                url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
        }

        .solution-background {
            background-image: linear-gradient(rgba(6, 11, 22, 0.92), rgba(6, 11, 22, 0.96)),
                url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
        }

        .step-line {
            position: relative;
        }

        .step-line::before {
            content: '';
            position: absolute;
            top: 48px;
            left: 20%;
            right: 20%;
            height: 2px;
            background: linear-gradient(90deg, rgba(38, 123, 255, 0.1), rgba(0, 229, 255, 0.5), rgba(38, 123, 255, 0.1));
            border-radius: 2px;
        }

        @media (max-width: 768px) {
            .step-line::before {
                display: none;
            }
        }

/* roulang page: category1 */
:root {
            --bg: #060B16;
            --panel: #0D1524;
            --glass: rgba(17, 25, 40, 0.6);
            --border: rgba(255, 255, 255, 0.08);
            --primary: #267BFF;
            --neon: #00E5FF;
            --accent: #7C5CFF;
            --success: #00D68F;
            --danger: #FF4D4F;
            --warning: #FFC53D;
            --cmain: #F0F4F8;
            --csub: #9AA7B8;
            --cfaint: #64748B;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background: var(--bg);
            color: var(--cmain);
            font-family: "PingFang SC", "Microsoft YaHei", "HarmonicOS Sans SC", sans-serif;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            text-decoration: none;
            transition: all .2s;
        }
        .container-custom {
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .nav-card {
            background: rgba(13, 21, 36, 0.85);
            backdrop-filter: blur(16px);
            border: 1px solid var(--border);
            border-radius: 20px;
            margin-top: 16px;
        }
        .nav-link {
            padding: 8px 16px;
            border-radius: 10px;
            color: var(--csub);
            font-size: 14px;
            font-weight: 500;
            border: 1px solid transparent;
            transition: all .2s;
        }
        .nav-link:hover {
            color: var(--cmain);
            background: rgba(255, 255, 255, 0.04);
            border-color: rgba(38, 123, 255, 0.35);
        }
        .nav-link.active {
            color: var(--neon);
            border-color: rgba(0, 229, 255, 0.3);
            background: rgba(0, 229, 255, 0.06);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.08);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: linear-gradient(135deg, var(--primary), var(--neon));
            color: #060B16;
            font-weight: 600;
            transition: all .2s;
            cursor: pointer;
        }
        .btn-primary:hover {
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.35);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: rgba(17, 25, 40, 0.6);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--cmain);
            transition: all .2s;
            cursor: pointer;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            box-shadow: 0 0 16px rgba(38, 123, 255, 0.15);
        }
        .glass {
            position: relative;
            background: var(--glass);
            backdrop-filter: blur(12px);
            border: 1px solid var(--border);
            border-radius: 20px;
        }
        .glass::before {
            content: "";
            position: absolute;
            top: 0;
            left: 16px;
            right: 16px;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--primary), var(--neon));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .grid-bg {
            background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 40px 40px;
        }
        .section-pad {
            padding: 96px 0;
        }
        .footer-link {
            color: var(--cfaint);
            font-size: 14px;
            line-height: 2.4;
            transition: color .2s;
        }
        .footer-link:hover {
            color: var(--cmain);
        }
        .input-dark {
            height: 52px;
            border-radius: 12px;
            background: rgba(13, 21, 36, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--cmain);
            padding: 0 16px;
            outline: none;
            transition: all .2s;
            width: 100%;
            font-size: 14px;
        }
        .input-dark:focus {
            border-color: var(--neon);
            box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.08);
        }
        .input-dark::placeholder {
            color: var(--cfaint);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 14px;
            border-radius: 999px;
            background: rgba(0, 229, 255, 0.06);
            border: 1px solid rgba(0, 229, 255, 0.2);
            color: var(--neon);
            font-size: 13px;
            font-weight: 500;
        }
        .icon-badge {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(38, 123, 255, 0.1);
            border: 1px solid rgba(38, 123, 255, 0.2);
            flex-shrink: 0;
        }
        .step-line {
            position: relative;
        }
        .step-line:not(:last-child)::after {
            content: "";
            position: absolute;
            top: 24px;
            left: 60px;
            right: -28px;
            height: 2px;
            background: linear-gradient(90deg, rgba(0, 229, 255, 0.2), rgba(38, 123, 255, 0.1));
        }
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .faq-q {
            padding: 20px 0;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--cmain);
            transition: color .2s;
        }
        .faq-q:hover {
            color: var(--neon);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
            color: var(--csub);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-item.open .faq-a {
            max-height: 360px;
            padding-bottom: 20px;
        }
        .faq-arrow {
            transition: transform .3s;
            flex-shrink: 0;
        }
        .faq-item.open .faq-arrow {
            transform: rotate(45deg);
        }
        .stat-card {
            padding: 24px 16px;
            border-radius: 20px;
        }
        .stat-num {
            font-size: 44px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -1px;
        }
        @media (max-width: 768px) {
            .section-pad {
                padding: 64px 0;
            }
            .stat-num {
                font-size: 32px;
            }
        }

/* roulang page: article */
:root {
            --bg: #060B16;
            --panel: #0D1524;
            --glass: rgba(17, 25, 40, 0.6);
            --border: rgba(255, 255, 255, 0.08);
            --border-strong: rgba(255, 255, 255, 0.14);
            --primary: #267BFF;
            --neon: #00E5FF;
            --purple: #7C5CFF;
            --success: #00D68F;
            --danger: #FF4D4F;
            --star: #FFC53D;
            --text-main: #F0F4F8;
            --text-sub: #9AA7B8;
            --text-faint: #64748B;
            --radius-card: 20px;
            --radius-btn: 12px;
            --radius-input: 12px;
            --section-gap: 96px;
            --container: 1240px;
            --font-sans: "PingFang SC", "Microsoft YaHei", "HarmonicOS Sans SC", sans-serif;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font-sans);
            background: var(--bg);
            color: var(--text-main);
            line-height: 1.75;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button,
        input {
            font-family: inherit;
        }
        .container-custom {
            max-width: var(--container);
            margin-left: auto;
            margin-right: auto;
            padding-left: 20px;
            padding-right: 20px;
        }
        .section-pad {
            padding: 96px 0;
        }
        @media (max-width: 767px) {
            .container-custom {
                padding-left: 16px;
                padding-right: 16px;
            }
            .section-pad {
                padding: 64px 0;
            }
        }
        .grid-bg {
            background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 60px 60px;
        }
        .glass {
            background: var(--glass);
            border: 1px solid var(--border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(14px);
            box-shadow: 0 16px 48px rgba(0, 0, 0, 0.25);
            position: relative;
        }
        .glass::before {
            content: "";
            position: absolute;
            top: 0;
            left: 16px;
            right: 16px;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
        }
        .nav-card {
            background: rgba(13, 21, 36, 0.85);
            border: 1px solid var(--border);
            border-radius: 18px;
            backdrop-filter: blur(16px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 10px 16px;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid transparent;
            transition: all 0.25s ease;
        }
        .nav-link:hover {
            color: #fff;
            background: rgba(38, 123, 255, 0.1);
            border-color: rgba(38, 123, 255, 0.35);
            box-shadow: 0 0 18px rgba(38, 123, 255, 0.15);
        }
        .nav-link.active {
            color: var(--neon);
            background: rgba(0, 229, 255, 0.08);
            border-color: rgba(0, 229, 255, 0.3);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
            font-weight: 600;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, var(--primary), #4085FF);
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            box-shadow: 0 4px 20px rgba(38, 123, 255, 0.35);
            transition: all 0.25s ease;
        }
        .btn-primary:hover {
            box-shadow: 0 8px 32px rgba(38, 123, 255, 0.55);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.97);
            box-shadow: 0 4px 14px rgba(38, 123, 255, 0.4);
        }
        .btn-primary:focus-visible {
            outline: 2px solid var(--neon);
            outline-offset: 2px;
        }
        .btn-neon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 32px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, var(--neon), #1FA6FF);
            color: #071018;
            font-size: 15px;
            font-weight: 700;
            box-shadow: 0 4px 18px rgba(0, 229, 255, 0.28);
            transition: all 0.25s ease;
        }
        .btn-neon:hover {
            box-shadow: 0 8px 28px rgba(0, 229, 255, 0.45);
            transform: translateY(-2px);
        }
        .btn-neon:active {
            transform: scale(0.97);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-strong);
            color: var(--text-main);
            font-size: 14px;
            font-weight: 500;
            transition: all 0.25s ease;
        }
        .btn-ghost:hover {
            border-color: var(--primary);
            color: #fff;
            background: rgba(38, 123, 255, 0.08);
        }
        .btn-ghost:focus-visible {
            outline: 2px solid var(--primary);
            outline-offset: 2px;
        }
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 4px 12px;
            border-radius: 99px;
            font-size: 12px;
            font-weight: 500;
            color: var(--neon);
            background: rgba(0, 229, 255, 0.08);
            border: 1px solid rgba(0, 229, 255, 0.2);
        }
        .badge-blue {
            color: var(--primary);
            background: rgba(38, 123, 255, 0.08);
            border-color: rgba(38, 123, 255, 0.25);
        }
        .gradient-text {
            background: linear-gradient(120deg, #F0F4F8, var(--neon));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            color: transparent;
        }
        .footer-link {
            color: var(--text-faint);
            font-size: 14px;
            line-height: 2.2;
            transition: color 0.2s;
        }
        .footer-link:hover {
            color: var(--neon);
        }
        .input-base {
            width: 100%;
            height: 48px;
            border-radius: var(--radius-input);
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: var(--text-main);
            font-size: 14px;
            padding: 0 14px;
            outline: none;
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .input-base:focus {
            border-color: var(--neon);
            box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
        }
        .article-body {
            font-size: 16px;
            line-height: 1.9;
            color: #C2CEDA;
        }
        .article-body h2 {
            font-size: 24px;
            font-weight: 700;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            color: #fff;
            padding-left: 0.75rem;
            border-left: 3px solid var(--primary);
            line-height: 1.4;
        }
        .article-body h3 {
            font-size: 20px;
            font-weight: 600;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
            color: #fff;
            line-height: 1.5;
        }
        .article-body p {
            margin-bottom: 1.25rem;
            color: #C2CEDA;
        }
        .article-body ul {
            margin: 1.25rem 0;
            padding-left: 1.5rem;
            list-style: disc;
        }
        .article-body ol {
            margin: 1.25rem 0;
            padding-left: 1.5rem;
            list-style: decimal;
        }
        .article-body li {
            margin-bottom: 0.5rem;
            color: #C2CEDA;
        }
        .article-body blockquote {
            border-left: 3px solid var(--neon);
            background: rgba(0, 229, 255, 0.06);
            padding: 1rem 1.25rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
            color: #B4C0D0;
        }
        .article-body a {
            color: var(--neon);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: #6FF0FF;
        }
        .article-body img {
            border-radius: 16px;
            margin: 1.5rem 0;
            max-width: 100%;
            height: auto;
        }
        .article-body code {
            background: rgba(255, 255, 255, 0.08);
            padding: 0.15rem 0.4rem;
            border-radius: 6px;
            font-size: 0.9em;
        }
        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            font-size: 14px;
        }
        .article-body th {
            background: rgba(255, 255, 255, 0.06);
            color: #fff;
            padding: 10px 14px;
            text-align: left;
            font-weight: 600;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        }
        .article-body td {
            padding: 10px 14px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            color: #C2CEDA;
        }
        .related-card {
            background: var(--glass);
            border: 1px solid var(--border);
            border-radius: 20px;
            overflow: hidden;
            transition: all 0.3s ease;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            border-color: rgba(38, 123, 255, 0.4);
            box-shadow: 0 8px 36px rgba(38, 123, 255, 0.18);
            transform: translateY(-3px);
        }
        .related-card img {
            transition: transform 0.4s ease;
        }
        .related-card:hover img {
            transform: scale(1.03);
        }
        .cta-panel {
            background-color: var(--panel);
            border: 1px solid var(--border);
            position: relative;
            overflow: hidden;
        }
        .cta-panel::before {
            content: "";
            position: absolute;
            top: 0;
            left: 15%;
            right: 15%;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.6), transparent);
        }
        .mobile-nav {
            display: none;
        }
        @media (max-width: 1023px) {
            .mobile-nav.open {
                display: flex;
            }
        }
        .crumb-link {
            color: var(--text-faint);
            transition: color 0.2s;
        }
        .crumb-link:hover {
            color: var(--neon);
        }
        .empty-state {
            text-align: center;
            padding: 60px 20px;
            background: var(--glass);
            border: 1px dashed var(--border-strong);
            border-radius: 20px;
        }
        .empty-state .icon {
            width: 64px;
            height: 64px;
            border-radius: 18px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid var(--border);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 16px;
            font-size: 28px;
        }

/* roulang page: category2 */
:root {
            --bg: #060B16;
            --panel: #0D1524;
            --glass: rgba(17, 25, 40, 0.6);
            --board: rgba(255, 255, 255, 0.08);
            --primary: #267BFF;
            --neon: #00E5FF;
            --violet: #7C5CFF;
            --success: #00D68F;
            --danger: #FF4D4F;
            --star: #FFC53D;
            --cmain: #F0F4F8;
            --csub: #9AA7B8;
            --cfaint: #64748B;
            --radius-card: 20px;
            --radius-btn: 12px;
            --space-section: 96px;
        }
        * {
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            margin: 0;
            background: var(--bg);
            color: var(--cmain);
            font-family: "PingFang SC", "Microsoft YaHei", "HarmonicOS Sans SC", sans-serif;
            font-size: 15px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
            overflow-x: hidden;
        }
        body::before {
            content: "";
            position: fixed;
            inset: 0;
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 44px 44px;
            pointer-events: none;
            z-index: 0;
        }
        img {
            max-width: 100%;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        input {
            font-family: inherit;
        }
        .container-custom {
            max-width: 1240px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }
        .section-pad {
            padding: var(--space-section) 0;
        }
        .glass {
            background: var(--glass);
            border: 1px solid var(--board);
            border-radius: var(--radius-card);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
            position: relative;
        }
        .glass::before {
            content: "";
            position: absolute;
            top: 0;
            left: 24px;
            right: 24px;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.25), transparent);
            pointer-events: none;
        }
        .grid-bg {
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 44px 44px;
        }
        .text-gradient {
            background: linear-gradient(135deg, var(--primary) 0%, var(--neon) 100%);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .nav-card {
            background: rgba(13, 21, 36, 0.82);
            border: 1px solid var(--board);
            border-radius: 20px;
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
        }
        .nav-link {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 18px;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--csub);
            border: 1px solid transparent;
            transition: all .25s ease;
            white-space: nowrap;
        }
        .nav-link:hover {
            color: var(--cmain);
            background: rgba(255, 255, 255, 0.05);
            border-color: rgba(255, 255, 255, 0.1);
            transform: translateY(-1px);
        }
        .nav-link.active {
            color: var(--neon);
            background: rgba(0, 229, 255, 0.08);
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: 0 0 20px rgba(0, 229, 255, 0.08);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--primary), var(--neon));
            color: #fff;
            font-size: 14px;
            font-weight: 600;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            border: none;
            box-shadow: 0 0 12px rgba(38, 123, 255, 0.35);
            transition: all .25s ease;
            white-space: nowrap;
        }
        .btn-primary:hover {
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.4);
            transform: translateY(-2px);
        }
        .btn-primary:active {
            transform: scale(0.98);
            box-shadow: 0 0 10px rgba(0, 229, 255, 0.3);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.04);
            color: var(--cmain);
            font-size: 14px;
            font-weight: 500;
            padding: 12px 28px;
            border-radius: var(--radius-btn);
            border: 1px solid rgba(255, 255, 255, 0.12);
            transition: all .25s ease;
            white-space: nowrap;
        }
        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--neon);
            box-shadow: 0 0 16px rgba(38, 123, 255, 0.15);
            transform: translateY(-2px);
        }
        .footer-link {
            font-size: 14px;
            color: var(--csub);
            line-height: 2.2;
            transition: color .2s ease;
        }
        .footer-link:hover {
            color: var(--neon);
        }
        .download-card {
            display: flex;
            align-items: center;
            gap: 16px;
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 16px;
            padding: 18px 20px;
            transition: all .25s ease;
        }
        .download-card:hover {
            background: rgba(38, 123, 255, 0.06);
            border-color: rgba(38, 123, 255, 0.3);
            box-shadow: 0 4px 20px rgba(38, 123, 255, 0.12);
            transform: translateY(-2px);
        }
        .icon-box {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(38, 123, 255, 0.12);
            border: 1px solid rgba(38, 123, 255, 0.2);
            color: var(--primary);
            flex-shrink: 0;
        }
        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.07);
        }
        .faq-item:last-child {
            border-bottom: none;
        }
        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 22px 8px;
            font-size: 16px;
            font-weight: 600;
            color: var(--cmain);
            cursor: pointer;
            transition: color .2s ease;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
        }
        .faq-q:hover {
            color: var(--neon);
        }
        .faq-icon {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--csub);
            flex-shrink: 0;
            transition: all .3s ease;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            border-color: var(--neon);
            color: var(--neon);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height .35s ease;
        }
        .faq-a-inner {
            padding: 0 8px 22px;
            color: var(--csub);
            font-size: 14px;
            line-height: 1.8;
        }
        .faq-item.open .faq-a {
            max-height: 260px;
        }
        .hero-bg {
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .hero-bg::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(6, 11, 22, 0.92) 0%, rgba(6, 11, 22, 0.75) 45%, rgba(6, 11, 22, 0.35) 100%);
            pointer-events: none;
        }
        .hero-bg::after {
            content: "";
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 70% 30%, rgba(38, 123, 255, 0.18) 0%, transparent 60%);
            pointer-events: none;
        }
        .hero-content {
            position: relative;
            z-index: 2;
        }
        .cta-bg {
            background-image: url('/assets/images/backpic/back-2.webp');
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .cta-bg::before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(6, 11, 22, 0.88), rgba(13, 21, 36, 0.7));
            pointer-events: none;
        }
        .step-line {
            position: relative;
        }
        .step-line::before {
            content: "";
            position: absolute;
            top: 28px;
            left: 12%;
            right: 12%;
            height: 2px;
            background: linear-gradient(90deg, var(--primary), var(--neon));
            opacity: 0.35;
            border-radius: 2px;
        }
        @media (max-width: 1023px) {
            .step-line::before {
                display: none;
            }
        }
        @media (max-width: 767px) {
            :root {
                --space-section: 64px;
            }
            body {
                font-size: 15px;
            }
        }
        :focus-visible {
            outline: 2px solid var(--neon);
            outline-offset: 3px;
            border-radius: 6px;
        }

/* roulang page: category3 */
:root {
            --bg: #060B16;
            --panel: #0D1524;
            --card: rgba(17, 25, 40, 0.6);
            --border: rgba(255, 255, 255, 0.08);
            --primary: #267BFF;
            --neon: #00E5FF;
            --accent: #7C5CFF;
            --success: #00D68F;
            --warning: #FF4D4F;
            --star: #FFC53D;
            --text-main: #F0F4F8;
            --text-sub: #9AA7B8;
            --text-faint: #64748B;
        }

        * {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            background: var(--bg);
            color: var(--text-main);
            font-family: "PingFang SC", "Microsoft YaHei", "HarmonicOS Sans SC", sans-serif;
            line-height: 1.75;
            margin: 0;
            padding: 0;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.3s ease;
        }

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

        button,
        input {
            font-family: inherit;
        }

        .container-custom {
            max-width: 1280px;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        .glass {
            background: rgba(17, 25, 40, 0.6);
            border: 1px solid rgba(255, 255, 255, 0.08);
            backdrop-filter: blur(12px);
        }

        .grid-bg {
            background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
            background-size: 40px 40px;
        }

        .text-gradient {
            background: linear-gradient(135deg, #267BFF 0%, #00E5FF 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            color: transparent;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, #267BFF, #00E5FF);
            color: #0A0F1E;
            font-weight: 600;
            font-size: 14px;
            border-radius: 12px;
            padding: 12px 28px;
            border: none;
            cursor: pointer;
            transition: all 0.3s ease;
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.25);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 24px rgba(0, 229, 255, 0.45);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-primary:focus-visible,
        .btn-secondary:focus-visible {
            outline: 2px solid var(--neon);
            outline-offset: 2px;
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.14);
            color: var(--text-main);
            font-weight: 500;
            font-size: 14px;
            border-radius: 12px;
            padding: 12px 28px;
            cursor: pointer;
            transition: all 0.3s ease;
        }

        .btn-secondary:hover {
            border-color: var(--primary);
            color: var(--neon);
            background: rgba(38, 123, 255, 0.06);
        }

        .btn-secondary:active {
            transform: scale(0.98);
        }

        .nav-card {
            background: rgba(13, 21, 36, 0.85);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            backdrop-filter: blur(16px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
            margin-top: 16px;
            position: relative;
            z-index: 50;
        }

        .nav-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 16px;
            right: 16px;
            height: 1px;
            background: linear-gradient(90deg, transparent, rgba(0, 229, 255, 0.4), transparent);
            border-radius: 16px 16px 0 0;
        }

        .nav-link {
            display: inline-flex;
            align-items: center;
            padding: 8px 16px;
            border-radius: 10px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            transition: all 0.3s ease;
            border: 1px solid transparent;
            background: transparent;
            white-space: nowrap;
        }

        .nav-link:hover {
            color: var(--text-main);
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(255, 255, 255, 0.08);
        }

        .nav-link.active {
            color: var(--neon);
            background: rgba(0, 229, 255, 0.08);
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: 0 0 12px rgba(0, 229, 255, 0.12);
        }

        .mobile-link {
            display: block;
            padding: 12px 16px;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 500;
            color: var(--text-sub);
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.07);
            margin-bottom: 8px;
            transition: all 0.3s ease;
        }

        .mobile-link:hover,
        .mobile-link.active {
            color: var(--neon);
            border-color: rgba(0, 229, 255, 0.2);
            background: rgba(0, 229, 255, 0.06);
        }

        .section-pad {
            padding-top: 96px;
            padding-bottom: 96px;
        }

        .card-hover {
            transition: all 0.3s ease;
        }

        .card-hover:hover {
            background: rgba(17, 25, 40, 0.85);
            border-color: rgba(0, 229, 255, 0.25);
            transform: translateY(-4px);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
        }

        .footer-link {
            color: var(--text-faint);
            font-size: 14px;
            line-height: 2.4;
            transition: color 0.3s ease;
        }

        .footer-link:hover {
            color: var(--neon);
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .faq-item:first-child {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 24px 8px;
            cursor: pointer;
            color: var(--text-main);
            font-size: 16px;
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .faq-question:hover {
            color: var(--neon);
        }

        .faq-question .icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            transition: all 0.3s ease;
            color: var(--text-sub);
        }

        .faq-item.open .faq-question .icon {
            transform: rotate(45deg);
            border-color: var(--neon);
            color: var(--neon);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 8px;
            color: var(--text-sub);
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding-bottom: 20px;
        }

        @media (max-width: 768px) {
            .section-pad {
                padding-top: 64px;
                padding-bottom: 64px;
            }
        }