/* roulang page: index */
:root {
            --primary: #2E6BE6;
            --primary-dark: #1E56C8;
            --ink: #0F2A4D;
            --bg: #F5F8FC;
            --card-bg: #FFFFFF;
            --border: #E4EBF4;
            --text: #334155;
            --text-light: #7B8AA0;
            --accent: #F76B15;
            --radius: 12px;
            --radius-lg: 16px;
            --shadow: 0 2px 12px rgba(16, 42, 82, 0.08);
            --shadow-hover: 0 8px 28px rgba(16, 42, 82, 0.14);
            --transition: 0.25s ease;
            --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--ink);
            font-weight: 700;
            line-height: 1.3;
            margin-top: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s ease;
        }

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

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

        .container {
            max-width: 1280px;
        }

        .btn {
            border-radius: 8px;
            font-weight: 600;
            padding: 12px 30px;
            transition: all 0.25s ease;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 15px;
            gap: 8px;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(46, 107, 230, 0.28);
        }

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

        .btn-accent:hover {
            background: #e05a0b;
            border-color: #e05a0b;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(247, 107, 21, 0.3);
        }

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

        .btn-outline:hover {
            background: rgba(46, 107, 230, 0.08);
            color: var(--primary-dark);
            transform: translateY(-2px);
        }

        .btn:focus-visible,
        .form-control:focus {
            outline: 2px solid rgba(46, 107, 230, 0.35);
            outline-offset: 2px;
            box-shadow: none;
        }

        .section-head {
            margin-bottom: 44px;
            position: relative;
        }

        .section-head h2 {
            font-size: 30px;
            margin-bottom: 10px;
        }

        .section-head h2::before {
            content: "";
            display: inline-block;
            width: 4px;
            height: 24px;
            background: var(--primary);
            border-radius: 3px;
            margin-right: 12px;
            vertical-align: -3px;
        }

        .section-head p {
            font-size: 15px;
            color: var(--text-light);
            margin: 0;
            padding-left: 16px;
        }

        .badge {
            font-size: 13px;
            font-weight: 500;
            border-radius: 4px;
            padding: 4px 10px;
            background: #E8F0FE;
            color: var(--primary);
        }

        /* Header */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1050;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(6px);
            transition: box-shadow 0.3s ease, background 0.3s ease;
        }

        .site-header.scrolled {
            background: #fff;
            box-shadow: 0 4px 16px rgba(16, 42, 82, 0.08);
        }

        .site-header .navbar {
            padding: 12px 0;
            min-height: 72px;
        }

        .navbar-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 0;
            margin: 0;
        }

        .brand-badge {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border-radius: 9px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 17px;
            font-weight: 700;
            letter-spacing: 0.5px;
            flex-shrink: 0;
        }

        .brand-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--ink);
            white-space: nowrap;
        }

        .navbar .nav-link {
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            padding: 8px 16px !important;
            border-radius: 6px;
            position: relative;
            transition: color 0.2s ease, background 0.2s ease;
        }

        .navbar .nav-link:hover {
            color: var(--primary);
            background: #F0F6FC;
        }

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

        .navbar .nav-link.active::after {
            content: "";
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            bottom: 2px;
            width: 24px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-cta {
            margin-left: 16px;
            padding: 9px 22px;
            font-size: 14px;
        }

        .navbar-toggler {
            border: none;
            padding: 8px 10px;
            background: transparent;
        }

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

        .toggler-line {
            display: block;
            width: 22px;
            height: 2px;
            border-radius: 2px;
            background: var(--ink);
            margin: 4px 0;
            transition: all 0.25s ease;
        }

        /* Hero */
        .hero {
            background: linear-gradient(135deg, #F0F6FC 0%, #E3ECFA 100%);
            padding: 88px 0 96px;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: "";
            position: absolute;
            width: 460px;
            height: 460px;
            border-radius: 50%;
            background: rgba(46, 107, 230, 0.06);
            top: -160px;
            right: -80px;
        }

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

        .hero-tag {
            display: inline-block;
            background: #fff;
            border: 1px solid rgba(46, 107, 230, 0.18);
            color: var(--primary);
            font-size: 13px;
            font-weight: 600;
            padding: 6px 14px;
            border-radius: 30px;
            margin-bottom: 20px;
            letter-spacing: 0.2px;
        }

        .hero h1 {
            font-size: 42px;
            line-height: 1.25;
            margin-bottom: 18px;
            max-width: 640px;
        }

        .hero h1 span {
            color: var(--primary);
        }

        .hero-sub {
            font-size: 17px;
            color: var(--text);
            line-height: 1.8;
            max-width: 560px;
            margin-bottom: 28px;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            margin-bottom: 28px;
        }

        .hero-points {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 18px;
        }

        .hero-points li {
            font-size: 14px;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .hero-points .check {
            width: 18px;
            height: 18px;
            border-radius: 50%;
            background: rgba(46, 107, 230, 0.12);
            color: var(--primary);
            font-size: 12px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .hero-visual {
            position: relative;
            padding-bottom: 24px;
        }

        .hero-img-wrap {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(16, 42, 82, 0.14);
            position: relative;
            z-index: 2;
            aspect-ratio: 4 / 3;
        }

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

        .hero-shape {
            position: absolute;
            bottom: 0;
            left: 32px;
            width: 72%;
            height: 100px;
            background: rgba(255, 255, 255, 0.55);
            border-radius: 16px;
            z-index: 1;
        }

        /* Steps */
        .step-section {
            padding: 96px 0;
        }

        .steps-row {
            margin-top: 10px;
        }

        .step-col {
            position: relative;
            margin-bottom: 28px;
        }

        .step-card {
            background: var(--card-bg);
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 32px 28px;
            height: 100%;
            position: relative;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
            overflow: hidden;
        }

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

        .step-num {
            font-size: 48px;
            font-weight: 700;
            color: rgba(46, 107, 230, 0.2);
            line-height: 1;
            display: block;
            margin-bottom: 20px;
        }

        .step-icon {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: #E8F0FE;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 18px;
        }

        .step-icon svg {
            width: 20px;
            height: 20px;
            stroke: var(--primary);
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .step-card h3 {
            font-size: 19px;
            font-weight: 600;
            margin-bottom: 10px;
        }

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

        @media (min-width: 992px) {
            .step-col:nth-child(2) .step-card {
                transform: translateY(16px);
            }

            .step-col + .step-col::before,
            .step-col + .step-col::after {
                content: "";
                position: absolute;
                top: 50%;
                z-index: 5;
            }

            .step-col + .step-col::before {
                left: -24px;
                width: 40px;
                height: 2px;
                border-top: 2px dashed #8db5f0;
            }

            .step-col + .step-col::after {
                left: -24px;
                width: 10px;
                height: 10px;
                border-top: 2px solid var(--primary);
                border-right: 2px solid var(--primary);
                transform: translateY(-50%) rotate(45deg);
                background: transparent;
            }
        }

        /* Access */
        .access-section {
            padding: 96px 0;
            background: #fff;
        }

        .access-card {
            background: var(--bg);
            border-radius: 12px;
            overflow: hidden;
            height: 100%;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
            border: 1px solid var(--border);
        }

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

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

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

        .access-card-body h3 {
            font-size: 18px;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .access-card-body p {
            font-size: 14px;
            color: var(--text-light);
            margin: 0;
            line-height: 1.65;
        }

        /* Cases */
        .case-section {
            padding: 96px 0;
        }

        .case-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr;
            gap: 24px;
            align-items: stretch;
        }

        .case-feature {
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow);
            display: flex;
            flex-direction: column;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

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

        .case-feature img {
            width: 100%;
            height: 240px;
            object-fit: cover;
        }

        .case-feature-body {
            padding: 28px;
            display: flex;
            flex-direction: column;
            justify-content: center;
            flex: 1;
        }

        .case-feature-body .badge {
            align-self: flex-start;
            margin-bottom: 14px;
        }

        .case-feature-body h3 {
            font-size: 22px;
            margin-bottom: 10px;
        }

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

        .case-feature-body a {
            font-size: 14px;
            font-weight: 500;
        }

        .case-side {
            display: grid;
            grid-template-rows: 1fr 1fr;
            gap: 24px;
        }

        .case-mini {
            background: #fff;
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 18px;
            display: flex;
            gap: 16px;
            align-items: center;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

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

        .case-mini img {
            width: 96px;
            height: 80px;
            border-radius: 8px;
            object-fit: cover;
            flex-shrink: 0;
        }

        .case-mini h4 {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 4px;
        }

        .case-mini p {
            font-size: 13px;
            color: var(--text-light);
            margin-bottom: 6px;
            line-height: 1.5;
        }

        .case-mini a {
            font-size: 13px;
            font-weight: 500;
        }

        @media (min-width: 992px) {
            .case-feature {
                flex-direction: row;
            }

            .case-feature img {
                width: 50%;
                height: auto;
                min-height: 280px;
            }
        }

        /* FAQ */
        .faq-section {
            padding: 96px 0;
            background: #fff;
        }

        .faq-section .accordion {
            max-width: 920px;
            margin: 0 auto;
        }

        .accordion-item {
            border: 1px solid var(--border) !important;
            border-radius: 12px !important;
            overflow: hidden;
            background: #fff;
            margin-bottom: 14px;
            box-shadow: 0 1px 4px rgba(16, 42, 82, 0.04);
        }

        .accordion-button {
            padding: 20px 28px;
            font-size: 16px;
            font-weight: 600;
            color: var(--ink);
            background: #fff;
            box-shadow: none !important;
            border: none !important;
            transition: background 0.25s ease;
        }

        .accordion-button:hover {
            background: #F8FBFF;
        }

        .accordion-button:not(.collapsed) {
            background: #F0F6FC;
            color: var(--ink);
            border-bottom: 1px solid var(--border) !important;
        }

        .accordion-button::after {
            background-image: none;
            content: "+";
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-size: 18px;
            font-weight: 400;
            color: var(--primary);
            width: 22px;
            height: 22px;
            border: 1.5px solid var(--primary);
            border-radius: 50%;
            flex-shrink: 0;
            transition: transform 0.25s ease, background-color 0.25s ease, color 0.25s ease;
            line-height: 1;
            text-align: center;
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
        }

        .accordion-body {
            background: #F0F6FC;
            padding: 14px 28px 18px 28px;
            border-left: 4px solid var(--primary);
            margin-left: 20px;
            margin-right: 20px;
            margin-top: 16px;
            margin-bottom: 20px;
            border-radius: 0 8px 8px 0;
            font-size: 15px;
            line-height: 1.7;
            color: var(--text);
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, #2E6BE6, #1E56C8);
            padding: 80px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::after {
            content: "";
            position: absolute;
            right: -90px;
            top: -110px;
            width: 280px;
            height: 280px;
            border-radius: 50%;
            background: rgba(15, 42, 77, 0.35);
        }

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

        .cta-left {
            color: #fff;
        }

        .cta-left h2 {
            color: #fff;
            font-size: 30px;
            margin-bottom: 14px;
        }

        .cta-left p {
            color: rgba(255, 255, 255, 0.85);
            font-size: 16px;
            line-height: 1.7;
            margin-bottom: 0;
        }

        .cta-card {
            background: #fff;
            border-radius: 16px;
            padding: 32px;
            box-shadow: 0 12px 32px rgba(15, 42, 77, 0.25);
            margin-top: 28px;
        }

        .cta-card .form-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }

        .cta-card .form-control {
            height: 44px;
            border-radius: 8px;
            border: 1px solid var(--border);
            padding: 10px 14px;
            font-size: 14px;
            color: var(--text);
            background: #fff;
            transition: border-color 0.25s ease, box-shadow 0.25s ease;
        }

        .cta-card .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(46, 107, 230, 0.15);
            outline: none;
        }

        .cta-card textarea.form-control {
            height: auto;
            min-height: 88px;
            resize: vertical;
        }

        .btn-submit {
            background: var(--accent);
            border: none;
            color: #fff;
            border-radius: 10px;
            padding: 13px 36px;
            font-weight: 600;
            font-size: 15px;
            transition: all 0.25s ease;
            width: 100%;
        }

        .btn-submit:hover {
            background: #e05a0b;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 6px 18px rgba(247, 107, 21, 0.32);
        }

        @media (min-width: 992px) {
            .cta-card {
                margin-top: 0;
            }
        }

        /* News */
        .news-section {
            padding: 96px 0;
        }

        .news-list {
            max-width: 980px;
            margin: 0 auto;
        }

        .news-item {
            display: flex;
            background: #fff;
            border-radius: 12px;
            box-shadow: var(--shadow);
            padding: 16px;
            gap: 20px;
            margin-bottom: 16px;
            transition: box-shadow 0.3s ease, transform 0.3s ease;
        }

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

        .news-thumb {
            width: 120px;
            height: 84px;
            border-radius: 8px;
            overflow: hidden;
            flex-shrink: 0;
        }

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

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

        .news-content h3 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 6px;
            line-height: 1.45;
        }

        .news-content h3 a {
            color: var(--ink);
        }

        .news-content h3 a:hover {
            color: var(--primary);
        }

        .news-desc {
            font-size: 14px;
            color: var(--text-light);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 8px;
        }

        .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: var(--text-light);
            flex-wrap: wrap;
        }

        .news-cat {
            background: #E8F0FE;
            color: var(--primary);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 500;
        }

        .news-more {
            margin-left: auto;
            color: var(--primary);
            font-weight: 500;
        }

        .news-more:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .news-empty {
            background: #fff;
            border-radius: 12px;
            padding: 56px 24px;
            text-align: center;
            color: var(--text-light);
            box-shadow: var(--shadow);
            border: 1px dashed var(--border);
            font-size: 15px;
        }

        /* Footer */
        .site-footer {
            background: #0F2A4D;
            color: rgba(255, 255, 255, 0.85);
            padding-top: 60px;
            font-size: 14px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }

        .footer-brand .brand-badge {
            font-size: 14px;
            width: 32px;
            height: 32px;
        }

        .footer-brand span {
            color: #fff;
            font-size: 17px;
            font-weight: 700;
        }

        .footer-about {
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.8;
            margin-bottom: 0;
            max-width: 320px;
        }

        .site-footer h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 18px;
        }

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

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

        .site-footer ul a {
            color: rgba(255, 255, 255, 0.8);
            font-size: 14px;
            display: inline-block;
            transition: all 0.25s ease;
        }

        .site-footer ul a:hover {
            color: #fff;
            padding-left: 3px;
        }

        .footer-info p {
            margin-bottom: 12px;
            color: rgba(255, 255, 255, 0.75);
            line-height: 1.8;
        }

        .footer-info .domain-line {
            background: rgba(255, 255, 255, 0.08);
            border-radius: 6px;
            padding: 8px 14px;
            display: inline-block;
            font-weight: 500;
            color: rgba(255, 255, 255, 0.9);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding: 18px 0;
            margin-top: 44px;
            text-align: center;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
        }

        /* Responsive */
        @media (max-width: 991px) {
            .hero {
                padding: 64px 0 72px;
            }

            .hero h1 {
                font-size: 34px;
            }

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

            .step-section,
            .access-section,
            .case-section,
            .faq-section,
            .news-section {
                padding: 64px 0;
            }

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

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

            .case-side {
                grid-template-columns: 1fr;
                grid-template-rows: none;
            }

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

            .cta-left {
                margin-bottom: 24px;
            }

            .navbar-nav {
                padding-top: 12px;
                padding-bottom: 12px;
            }

            .navbar .nav-link {
                padding: 10px 12px !important;
            }

            .nav-cta {
                margin-left: 0;
                margin-top: 10px;
                width: 100%;
            }
        }

        @media (max-width: 767px) {
            .hero h1 {
                font-size: 30px;
            }

            .hero-sub {
                font-size: 15px;
            }

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

            .step-section,
            .access-section,
            .case-section,
            .faq-section,
            .news-section {
                padding: 48px 0;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .section-head p {
                font-size: 14px;
            }

            .case-feature-body {
                padding: 20px;
            }

            .case-feature-body h3 {
                font-size: 18px;
            }

            .news-item {
                padding: 12px;
                gap: 14px;
            }

            .news-thumb {
                width: 80px;
                height: 80px;
            }

            .news-content h3 {
                font-size: 15px;
            }

            .news-desc {
                -webkit-line-clamp: 1;
            }
        }

        @media (max-width: 575px) {
            .brand-text {
                font-size: 15px;
            }

            .hero-tag {
                font-size: 12px;
            }

            .hero h1 {
                font-size: 26px;
            }

            .cta-card {
                padding: 22px;
            }

            .footer-bottom {
                font-size: 12px;
            }
        }

/* roulang page: category1 */
:root {
            --primary: #2E6BE6;
            --primary-dark: #1E56C8;
            --ink: #0F2A4D;
            --bg: #F5F8FC;
            --white: #FFFFFF;
            --border: #E4EBF4;
            --text: #334155;
            --muted: #7B8AA0;
            --accent: #F76B15;
            --radius: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 12px rgba(16, 42, 82, 0.08);
            --shadow-md: 0 6px 24px rgba(16, 42, 82, 0.12);
            --shadow-lg: 0 8px 28px rgba(16, 42, 82, 0.14);
            --transition: 0.25s ease;
        }

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

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg);
            color: var(--text);
            font-size: 16px;
            line-height: 1.75;
            margin: 0;
            padding: 0;
            -webkit-font-smoothing: antialiased;
        }

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

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

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

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

        /* ===== Buttons ===== */
        .btn {
            border-radius: 8px;
            padding: 12px 30px;
            font-weight: 600;
            font-size: 16px;
            border: 2px solid transparent;
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            cursor: pointer;
        }

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

        .btn-primary:hover {
            background: var(--primary-dark);
            border-color: var(--primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(46, 107, 230, 0.28);
        }

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

        .btn-outline-light:hover {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(46, 107, 230, 0.2);
        }

        .btn:focus-visible,
        .form-control:focus-visible {
            outline: none;
            box-shadow: 0 0 0 3px rgba(46, 107, 230, 0.25);
        }

        /* ===== Header ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.88);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border-bottom: 1px solid transparent;
            transition: background 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
        }

        .site-header.scrolled {
            background: var(--white);
            box-shadow: 0 4px 20px rgba(16, 42, 82, 0.08);
            border-color: var(--border);
        }

        .site-header .navbar {
            min-height: 72px;
            padding: 10px 0;
        }

        .navbar-brand {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 0;
            font-size: 15px;
            font-weight: 700;
            color: var(--ink);
        }

        .navbar-brand:hover {
            color: var(--ink);
        }

        .brand-badge {
            width: 34px;
            height: 34px;
            border-radius: 9px;
            background: linear-gradient(135deg, var(--primary), #4C8AF0);
            color: #fff;
            font-size: 16px;
            font-weight: 800;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            box-shadow: 0 4px 10px rgba(46, 107, 230, 0.25);
        }

        .brand-text {
            font-size: 15px;
            font-weight: 700;
            letter-spacing: 0.2px;
            white-space: nowrap;
        }

        .navbar-nav {
            gap: 8px;
        }

        .nav-link {
            font-size: 16px;
            font-weight: 500;
            color: var(--text);
            padding: 8px 18px !important;
            border-radius: 8px;
            position: relative;
            transition: color var(--transition), background var(--transition);
        }

        .nav-link:hover {
            color: var(--primary);
            background: #F0F6FC;
        }

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

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: 2px;
            transform: translateX(-50%);
            width: 24px;
            height: 2px;
            border-radius: 2px;
            background: var(--primary);
        }

        .nav-cta {
            margin-left: 18px;
            padding: 9px 24px;
            font-size: 14px;
            border-radius: 8px;
        }

        .navbar-toggler {
            border: none;
            padding: 6px 10px;
            display: flex;
            flex-direction: column;
            gap: 5px;
            background: transparent;
        }

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

        .toggler-line {
            width: 24px;
            height: 2px;
            border-radius: 2px;
            background: var(--ink);
            transition: all 0.3s ease;
        }

        /* ===== Page Hero ===== */
        .page-hero {
            position: relative;
            background: linear-gradient(135deg, #F0F6FC 0%, #E3ECFA 100%);
            padding: 76px 0 64px;
            overflow: hidden;
            border-bottom: 1px solid var(--border);
        }

        .page-hero::before {
            content: "";
            position: absolute;
            width: 360px;
            height: 360px;
            border-radius: 50%;
            background: rgba(46, 107, 230, 0.08);
            right: -90px;
            top: -110px;
            pointer-events: none;
        }

        .page-hero::after {
            content: "";
            position: absolute;
            width: 180px;
            height: 180px;
            border-radius: 50%;
            background: rgba(46, 107, 230, 0.05);
            left: 8%;
            bottom: -60px;
            pointer-events: none;
        }

        .page-hero-inner {
            display: flex;
            align-items: center;
            gap: 48px;
            position: relative;
            z-index: 2;
        }

        .page-hero-text {
            flex: 1;
            max-width: 640px;
        }

        .page-hero-text h1 {
            font-size: 38px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--ink);
            margin: 0 0 12px;
            letter-spacing: -0.3px;
        }

        .breadcrumb-line {
            font-size: 14px;
            color: var(--muted);
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 6px;
        }

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

        .breadcrumb-sep {
            color: #B8C4D6;
            margin: 0 4px;
        }

        .page-hero-desc {
            font-size: 17px;
            line-height: 1.8;
            color: var(--text);
            margin: 0;
            max-width: 560px;
        }

        .page-hero-visual {
            flex: 0 0 420px;
            position: relative;
        }

        .page-hero-visual img {
            width: 100%;
            border-radius: var(--radius-lg);
            box-shadow: 0 6px 24px rgba(16, 42, 82, 0.14);
            object-fit: cover;
            aspect-ratio: 4 / 3;
            position: relative;
            z-index: 2;
        }

        .page-hero-visual::after {
            content: "";
            position: absolute;
            left: -16px;
            bottom: -16px;
            width: 70%;
            height: 90px;
            background: rgba(46, 107, 230, 0.10);
            border-radius: var(--radius-lg);
            z-index: 1;
        }

        /* ===== Section ===== */
        .section {
            padding: 88px 0;
        }

        .section-head {
            margin-bottom: 44px;
            max-width: 760px;
        }

        .section-head .section-tag {
            display: inline-block;
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            background: #E8F0FE;
            padding: 5px 14px;
            border-radius: 100px;
            margin-bottom: 14px;
            letter-spacing: 0.3px;
        }

        .section-head h2 {
            font-size: 30px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--ink);
            margin: 0;
            position: relative;
            padding-left: 22px;
        }

        .section-head h2::before {
            content: "";
            position: absolute;
            left: 0;
            top: 4px;
            bottom: 4px;
            width: 4px;
            border-radius: 4px;
            background: var(--primary);
        }

        .section-head p {
            font-size: 16px;
            color: var(--muted);
            margin: 12px 0 0;
            line-height: 1.75;
        }

        .section-foot {
            margin-top: 36px;
            text-align: center;
            font-size: 14px;
            color: var(--muted);
        }

        /* ===== Overview ===== */
        .overview-wrap {
            background: var(--white);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: 40px;
            border: 1px solid var(--border);
            display: flex;
            gap: 40px;
            align-items: flex-start;
        }

        .overview-photo {
            flex: 0 0 280px;
        }

        .overview-photo img {
            border-radius: var(--radius);
            object-fit: cover;
            aspect-ratio: 4 / 3;
            width: 100%;
            box-shadow: var(--shadow-sm);
        }

        .overview-content {
            flex: 1;
        }

        .overview-content h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--ink);
            margin: 0 0 14px;
        }

        .overview-content p {
            font-size: 16px;
            line-height: 1.8;
            color: var(--text);
            margin-bottom: 16px;
        }

        .overview-content p:last-child {
            margin-bottom: 0;
        }

        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 18px;
        }

        .tag-item {
            font-size: 13px;
            font-weight: 500;
            color: var(--primary);
            background: #E8F0FE;
            padding: 5px 14px;
            border-radius: 100px;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* ===== Cards ===== */
        .guide-card {
            background: var(--white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            height: 100%;
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

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

        .guide-card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            border-radius: 0;
        }

        .guide-card-body {
            padding: 24px 26px 26px;
            display: flex;
            flex-direction: column;
            flex: 1;
        }

        .guide-card-body h3 {
            font-size: 19px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 10px;
            line-height: 1.4;
        }

        .guide-card-body p {
            font-size: 14px;
            line-height: 1.7;
            color: var(--muted);
            margin-bottom: 18px;
            flex: 1;
        }

        .card-link {
            font-size: 14px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 4px;
            transition: gap var(--transition);
        }

        .card-link:hover {
            gap: 8px;
            color: var(--primary-dark);
        }

        /* ===== Steps ===== */
        .steps-wrap {
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
        }

        .step-card {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 30px 26px;
            height: 100%;
            position: relative;
            transition: all var(--transition);
        }

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

        .step-card.middle {
            transform: translateY(16px);
        }

        .step-card.middle:hover {
            transform: translateY(14px);
        }

        .step-number {
            font-size: 48px;
            font-weight: 700;
            line-height: 1;
            color: rgba(46, 107, 230, 0.25);
            margin-bottom: 18px;
            user-select: none;
        }

        .step-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: #E8F0FE;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 14px;
            color: var(--primary);
        }

        .step-icon svg {
            width: 20px;
            height: 20px;
        }

        .step-card h3 {
            font-size: 18px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 8px;
        }

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

        .step-arrow {
            position: absolute;
            right: -26px;
            top: 50%;
            z-index: 3;
            font-size: 18px;
            color: #8FB4F0;
            transform: translateY(-50%);
            pointer-events: none;
        }

        /* ===== FAQ ===== */
        .faq-wrap {
            max-width: 840px;
            margin: 0 auto;
        }

        .accordion-item {
            background: var(--white);
            border: 1px solid var(--border);
            border-radius: var(--radius) !important;
            margin-bottom: 16px;
            overflow: hidden;
            box-shadow: 0 1px 4px rgba(16, 42, 82, 0.04);
        }

        .accordion-button {
            background: var(--white);
            color: var(--ink);
            font-size: 16px;
            font-weight: 600;
            padding: 20px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            box-shadow: none !important;
            border-radius: var(--radius) !important;
            transition: background var(--transition);
        }

        .accordion-button::after {
            content: "+";
            background: none !important;
            width: auto;
            height: auto;
            font-size: 24px;
            font-weight: 400;
            line-height: 1;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            justify-content: center;
            transition: transform 0.3s ease;
        }

        .accordion-button:not(.collapsed) {
            background: #F0F6FC;
            color: var(--primary);
        }

        .accordion-button:not(.collapsed)::after {
            transform: rotate(45deg);
        }

        .accordion-body {
            position: relative;
            padding: 22px 28px 24px;
            font-size: 15px;
            line-height: 1.7;
            color: var(--text);
            background: var(--white);
        }

        .accordion-body::before {
            content: "";
            position: absolute;
            left: 0;
            top: 18px;
            bottom: 18px;
            width: 4px;
            border-radius: 0 4px 4px 0;
            background: var(--primary);
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 72px 0;
            position: relative;
            overflow: hidden;
        }

        .cta-section::before {
            content: "";
            position: absolute;
            right: -80px;
            top: -80px;
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(15, 42, 77, 0.35);
        }

        .cta-inner {
            display: flex;
            align-items: center;
            gap: 56px;
            position: relative;
            z-index: 2;
        }

        .cta-content {
            flex: 1;
            color: #fff;
        }

        .cta-content h2 {
            font-size: 30px;
            font-weight: 700;
            line-height: 1.3;
            margin: 0 0 14px;
            color: #fff;
        }

        .cta-content p {
            font-size: 16px;
            line-height: 1.75;
            margin: 0;
            color: rgba(255, 255, 255, 0.9);
            max-width: 440px;
        }

        .cta-form-card {
            flex: 0 0 400px;
            background: var(--white);
            border-radius: var(--radius-lg);
            padding: 34px 32px;
            box-shadow: 0 18px 40px rgba(15, 42, 77, 0.22);
        }

        .cta-form-card .form-label {
            font-size: 14px;
            font-weight: 600;
            color: var(--ink);
            margin-bottom: 6px;
        }

        .cta-form-card .form-control {
            width: 100%;
            height: 44px;
            border-radius: 8px;
            border: 1px solid var(--border);
            padding: 10px 14px;
            font-size: 15px;
            color: var(--text);
            background: var(--white);
            transition: border-color var(--transition), box-shadow var(--transition);
        }

        .cta-form-card textarea.form-control {
            height: auto;
            resize: vertical;
            min-height: 80px;
        }

        .cta-form-card .form-control::placeholder {
            color: #A9B6C8;
        }

        .cta-form-card .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(46, 107, 230, 0.12);
            outline: none;
        }

        .btn-submit {
            background: var(--accent);
            color: #fff;
            border: 2px solid var(--accent);
            border-radius: 10px;
            padding: 14px 40px;
            font-size: 15px;
            font-weight: 700;
            width: 100%;
            margin-top: 6px;
            transition: all var(--transition);
        }

        .btn-submit:hover {
            background: #E55F0C;
            border-color: #E55F0C;
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(247, 107, 21, 0.32);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--ink);
            color: rgba(255, 255, 255, 0.85);
            padding: 0;
            margin-top: 0;
        }

        .site-footer .container {
            padding-top: 56px;
            padding-bottom: 24px;
        }

        .footer-brand {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 17px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-brand .brand-badge {
            background: rgba(255, 255, 255, 0.14);
            color: #fff;
            border: 1px solid rgba(255, 255, 255, 0.2);
            box-shadow: none;
        }

        .footer-about {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.72);
            margin: 0;
            max-width: 320px;
        }

        .site-footer h4 {
            font-size: 16px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 18px;
        }

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

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

        .site-footer ul a {
            display: inline-block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.72);
            transition: all var(--transition);
        }

        .site-footer ul a:hover {
            color: #fff;
            transform: translateX(2px);
        }

        .footer-info p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.72);
            margin-bottom: 12px;
        }

        .domain-line {
            color: rgba(255, 255, 255, 0.9);
            font-weight: 500;
            word-break: break-all;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.15);
            padding: 18px 0;
        }

        .footer-bottom p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.6);
            margin: 0;
            text-align: center;
        }

        /* ===== Responsive ===== */
        @media (max-width: 991.98px) {
            .page-hero-inner {
                flex-direction: column;
                gap: 32px;
            }

            .page-hero-visual {
                flex: 0 0 auto;
                width: 100%;
                max-width: 480px;
            }

            .overview-wrap {
                flex-direction: column;
                padding: 28px;
            }

            .overview-photo {
                flex: 0 0 auto;
                width: 100%;
                max-width: 420px;
            }

            .cta-inner {
                flex-direction: column;
                gap: 32px;
            }

            .cta-form-card {
                flex: 0 0 auto;
                width: 100%;
                max-width: 460px;
            }

            .steps-wrap {
                padding: 36px 24px;
            }

            .step-card.middle {
                transform: none;
            }

            .step-card.middle:hover {
                transform: translateY(-2px);
            }

            .step-arrow {
                display: none;
            }
        }

        @media (min-width: 768px) and (max-width: 991.98px) {
            .section {
                padding: 64px 0;
            }

            .navbar-collapse {
                padding: 12px 0;
            }

            .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                display: inline-flex;
            }
        }

        @media (max-width: 767.98px) {
            .container {
                padding-left: 18px;
                padding-right: 18px;
            }

            .section {
                padding: 52px 0;
            }

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

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

            .page-hero-desc {
                font-size: 15px;
            }

            .page-hero-visual {
                max-width: 100%;
            }

            .section-head h2 {
                font-size: 24px;
            }

            .section-head .section-tag {
                font-size: 12px;
                padding: 4px 12px;
            }

            .overview-wrap {
                padding: 22px;
            }

            .overview-content h3 {
                font-size: 18px;
            }

            .overview-content p {
                font-size: 14px;
            }

            .guide-card-body {
                padding: 20px 18px;
            }

            .guide-card-body h3 {
                font-size: 17px;
            }

            .steps-wrap {
                padding: 24px 16px;
            }

            .step-card {
                padding: 22px 18px;
            }

            .step-number {
                font-size: 40px;
            }

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

            .accordion-body {
                padding: 18px 18px 20px;
                font-size: 14px;
            }

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

            .cta-content h2 {
                font-size: 24px;
            }

            .cta-content p {
                font-size: 14px;
            }

            .cta-form-card {
                padding: 26px 20px;
            }

            .navbar-collapse {
                padding: 10px 0;
            }

            .brand-text {
                font-size: 14px;
            }

            .navbar-brand {
                font-size: 14px;
            }
        }

        @media (max-width: 520px) {
            .btn {
                width: 100%;
                padding: 12px 20px;
            }

            .nav-cta {
                width: 100%;
                margin-top: 6px;
            }

            .page-hero-visual::after {
                left: -8px;
                bottom: -8px;
                height: 60px;
            }

            .cta-form-card .btn-submit {
                padding: 12px 24px;
            }
        }

/* roulang page: article */
:root {
  --primary: #2E6BE6;
  --primary-dark: #1E56C8;
  --ink: #0F2A4D;
  --bg: #F5F8FC;
  --card-bg: #FFFFFF;
  --border: #E4EBF4;
  --text: #334155;
  --text-muted: #7B8AA0;
  --accent: #F76B15;
  --radius: 12px;
  --radius-lg: 16px;
  --shadow: 0 2px 12px rgba(16,42,82,0.08);
  --shadow-hover: 0 8px 28px rgba(16,42,82,0.14);
  --space-section: 96px;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  font-size: 16px;
  margin: 0;
}
a {
  text-decoration: none;
  color: var(--primary);
  transition: color .25s ease, background .25s ease, box-shadow .25s ease, transform .25s ease;
}
a:hover {
  color: var(--primary-dark);
}
img {
  max-width: 100%;
}
.container {
  max-width: 1280px;
}

/* ===== 按钮 ===== */
.btn {
  border-radius: 8px;
  padding: 12px 30px;
  font-weight: 600;
  transition: all .25s ease;
  font-size: 15px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}
.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  color: #fff;
}
.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(46, 107, 230, 0.3);
}
.btn-outline-primary {
  background: transparent;
  border: 1px solid var(--primary);
  color: var(--primary);
}
.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(46, 107, 230, 0.2);
}
.btn:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(46, 107, 230, 0.25);
}

/* ===== 导航 ===== */
.site-header {
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: background .3s ease, box-shadow .3s ease;
}
.site-header.scrolled {
  background: #ffffff;
  box-shadow: 0 4px 20px rgba(16, 42, 82, 0.08);
}
.navbar {
  min-height: 72px;
  padding: 12px 0;
}
.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0;
}
.brand-badge {
  width: 36px;
  height: 36px;
  background: var(--primary);
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.brand-text {
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  white-space: nowrap;
}
.navbar-nav {
  gap: 8px;
}
.nav-link {
  font-size: 16px;
  font-weight: 500;
  color: var(--text);
  padding: 8px 16px !important;
  border-radius: 6px;
  position: relative;
  transition: all .25s ease;
}
.nav-link:hover {
  color: var(--primary);
  background: #F0F6FC;
}
.nav-link.active {
  color: var(--primary);
}
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 24px;
  height: 2px;
  background: var(--primary);
  border-radius: 2px;
}
.nav-cta {
  margin-left: 12px;
  padding: 10px 24px;
  border-radius: 8px;
}
.navbar-toggler {
  border: none;
  box-shadow: none !important;
  padding: 8px;
}
.navbar-toggler:focus {
  outline: none;
  box-shadow: none;
}
.toggler-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
  transition: all .3s ease;
}

/* ===== 面包屑 ===== */
.breadcrumb-bar {
  background: #EDF2F8;
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.breadcrumb {
  margin: 0;
}
.breadcrumb-item {
  font-size: 14px;
}
.breadcrumb-item a {
  color: var(--text-muted);
}
.breadcrumb-item a:hover {
  color: var(--primary);
}
.breadcrumb-item.active {
  color: var(--text);
}
.breadcrumb-item + .breadcrumb-item::before {
  content: "›";
  color: var(--text-muted);
}

/* ===== 文章页主体 ===== */
.article-page {
  padding: 48px 0 80px;
}
.article-header {
  max-width: 760px;
  margin: 0 auto 32px;
}
.article-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
  font-size: 14px;
  color: var(--text-muted);
}
.article-category {
  display: inline-block;
  background: #E8F0FE;
  color: var(--primary);
  font-size: 13px;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 4px;
}
.article-date {
  font-size: 14px;
  color: var(--text-muted);
}
.article-header h1 {
  font-size: 30px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink);
  margin: 14px 0 16px;
}

/* ===== 正文阅读区 ===== */
.article-content {
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius);
  padding: 48px;
  box-shadow: var(--shadow);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
  word-wrap: break-word;
}
.article-content p {
  margin-bottom: 24px;
}
.article-content h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin: 40px 0 16px;
  line-height: 1.4;
}
.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 12px;
  line-height: 1.4;
}
.article-content img {
  border-radius: 12px;
  margin: 24px auto;
  display: block;
  max-width: 100%;
}
.article-content blockquote {
  background: #F0F6FC;
  border-left: 4px solid var(--primary);
  padding: 16px 24px;
  border-radius: 0 8px 8px 0;
  margin: 24px 0;
  color: var(--text);
}
.article-content ul,
.article-content ol {
  margin-bottom: 24px;
  padding-left: 1.5em;
}
.article-content li {
  margin-bottom: 8px;
}
.article-content a {
  color: var(--primary);
  font-weight: 500;
}
.article-content a:hover {
  text-decoration: underline;
}

/* ===== 无内容 ===== */
.no-content {
  max-width: 760px;
  margin: 0 auto;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 80px 30px;
  text-align: center;
  color: var(--text-muted);
  font-size: 16px;
}
.no-content p {
  margin-bottom: 20px;
}
.no-content a {
  color: var(--primary);
  font-weight: 500;
  padding: 10px 24px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: all .25s ease;
}
.no-content a:hover {
  background: #F0F6FC;
  border-color: var(--primary);
}

/* ===== 相关推荐 ===== */
.related-section {
  max-width: 960px;
  margin: 56px auto 0;
}
.related-section .section-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  margin-bottom: 24px;
  position: relative;
  padding-left: 18px;
}
.related-section .section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 6px;
  height: 22px;
  background: var(--primary);
  border-radius: 3px;
}
.related-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: all .3s ease;
  height: 100%;
  display: flex;
  flex-direction: column;
}
.related-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}
.related-card .card-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
}
.related-card .card-body {
  padding: 20px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.related-card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 10px;
  line-height: 1.4;
}
.related-card h3 a {
  color: var(--ink);
}
.related-card h3 a:hover {
  color: var(--primary);
}
.related-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 16px;
  flex: 1;
  line-height: 1.6;
}
.related-link {
  font-size: 13px;
  color: var(--primary);
  font-weight: 500;
}
.related-link:hover {
  color: var(--primary-dark);
}

/* ===== 返回入口 ===== */
.back-links {
  max-width: 760px;
  margin: 32px auto 0;
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}
.btn-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  background: #fff;
  color: var(--primary);
  border: 1px solid var(--border);
  transition: all .25s ease;
}
.btn-back:hover {
  background: #F0F6FC;
  color: var(--primary);
  border-color: var(--primary);
  transform: translateX(-2px);
}

/* ===== 页脚 ===== */
.site-footer {
  background: #0F2A4D;
  color: rgba(255, 255, 255, 0.85);
  padding-top: 64px;
  margin-top: 80px;
}
.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
}
.footer-brand .brand-badge {
  font-size: 16px;
  width: 32px;
  height: 32px;
}
.footer-about {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.7);
  max-width: 340px;
  margin-bottom: 0;
}
.site-footer h4 {
  font-size: 16px;
  font-weight: 600;
  color: #fff;
  margin-bottom: 18px;
}
.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.site-footer ul li {
  margin-bottom: 10px;
}
.site-footer ul a {
  color: rgba(255, 255, 255, 0.7);
  font-size: 14px;
  transition: all .25s ease;
}
.site-footer ul a:hover {
  color: #fff;
  padding-left: 4px;
}
.footer-info p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
  line-height: 1.7;
  margin-bottom: 10px;
}
.footer-info .domain-line {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  padding: 20px 0;
  margin-top: 40px;
}
.footer-bottom p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin: 0;
  text-align: center;
}

/* ===== 响应式 ===== */
@media (max-width: 991px) {
  .navbar-collapse {
    padding: 12px 0;
  }
  .navbar-nav {
    gap: 0;
    margin-top: 8px;
  }
  .nav-cta {
    margin-left: 0;
    margin-top: 14px;
    width: 100%;
  }
  .nav-link.active::after {
    display: none;
  }
  .site-footer {
    padding-top: 48px;
  }
}
@media (max-width: 767px) {
  .article-page {
    padding: 32px 0 56px;
  }
  .article-header h1 {
    font-size: 24px;
  }
  .article-content {
    padding: 28px 20px;
    border-radius: 10px;
  }
  .related-section .section-title {
    font-size: 20px;
  }
  .related-card .card-thumb {
    height: 160px;
  }
  .back-links {
    flex-direction: column;
  }
  .btn-back {
    width: 100%;
    justify-content: center;
  }
}
@media (max-width: 520px) {
  .article-meta {
    gap: 10px;
  }
  .article-content {
    font-size: 15px;
  }
  .article-content h2 {
    font-size: 20px;
  }
  .article-content h3 {
    font-size: 17px;
  }
}