/* roulang page: index */
:root {
    --color-primary: #0e7490;
    --color-primary-light: #22d3ee;
    --color-accent: #f97316;
    --color-promo: #f43f5e;
    --color-bg: #f8fafc;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-card: #ffffff;
    --radius-lg: 1.5rem;
    --radius-md: 1rem;
    --radius-sm: 0.75rem;
    --shadow-default: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-hover: 0 12px 24px -8px rgba(14, 116, 144, 0.18), 0 4px 8px -4px rgba(15, 23, 42, 0.08);
  }

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

  html {
    scroll-behavior: smooth;
  }

  body {
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.75;
    background-color: var(--color-bg);
    color: var(--color-text);
    -webkit-font-smoothing: antialiased;
  }

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

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

  button,
  input,
  select,
  textarea {
    font-family: inherit;
    font-size: inherit;
    line-height: inherit;
    border: none;
    outline: none;
    background: none;
  }

  .container-x {
    max-width: 80rem;
    margin: 0 auto;
    padding: 0 1rem;
  }

  @media (min-width: 640px) {
    .container-x {
      padding: 0 1.5rem;
    }
  }

  @media (min-width: 1024px) {
    .container-x {
      padding: 0 2rem;
    }
  }

  .section-title {
    font-size: 1.875rem;
    font-weight: 700;
    line-height: 1.3;
    color: #0f172a;
    position: relative;
    padding-left: 1rem;
  }

  .section-title::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.25rem;
    width: 4px;
    height: 80%;
    border-radius: 4px;
    background: linear-gradient(180deg, #06b6d4, #6366f1);
  }

  @media (min-width: 768px) {
    .section-title {
      font-size: 2rem;
    }
  }

  .article-body {
    font-size: 1rem;
    line-height: 1.9;
    color: #334155;
  }

  .article-body h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0f172a;
    margin-top: 2.5rem;
    margin-bottom: 1rem;
  }

  .article-body p {
    margin-bottom: 1.25rem;
  }

  .article-body ul,
  .article-body ol {
    margin: 1rem 0 1.25rem;
    padding-left: 1.5rem;
  }

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

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

  .article-body blockquote {
    border-left: 4px solid #0e7490;
    background: #f0f9ff;
    padding: 1rem 1.5rem;
    border-radius: 0 0.75rem 0.75rem 0;
    margin: 1.5rem 0;
    color: #1e293b;
  }

  .article-body table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
    margin: 1.25rem 0;
    border-radius: 0.75rem;
    overflow: hidden;
  }

  .article-body th,
  .article-body td {
    border: 1px solid #e2e8f0;
    padding: 0.75rem 1rem;
    text-align: left;
  }

  .article-body th {
    background: #f1f5f9;
    font-weight: 600;
  }

  .article-body img {
    border-radius: 1rem;
    margin: 1.25rem 0;
  }

  .faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.3s ease;
    padding-left: 2.25rem;
    padding-right: 1rem;
  }

  .faq-content.open {
    max-height: 320px;
    padding-bottom: 1rem;
  }

  .faq-icon {
    transition: transform 0.3s ease;
  }

  .faq-btn.open .faq-icon {
    transform: rotate(45deg);
  }

  .fade-up {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  .fade-up.visible {
    opacity: 1;
    transform: translateY(0);
  }

  @keyframes float-slow {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-10px) rotate(2deg); }
  }

  .float-slow {
    animation: float-slow 6s ease-in-out infinite;
  }

  .timeline-dot::before {
    content: "";
    position: absolute;
    left: -0.375rem;
    top: 0.75rem;
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 9999px;
    background: #06b6d4;
    border: 2px solid #fff;
    box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.2);
  }

  .navbar-link {
    position: relative;
    transition: color 0.2s;
  }

  .navbar-link::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    border-radius: 2px;
    background: linear-gradient(90deg, #06b6d4, #6366f1);
    transition: width 0.3s;
  }

  .navbar-link:hover::after,
  .navbar-link.active::after {
    width: 100%;
  }

  .btn-glow {
    box-shadow: 0 4px 16px rgba(6, 182, 212, 0.35);
  }

  .btn-glow:hover {
    box-shadow: 0 8px 24px rgba(6, 182, 212, 0.5);
    transform: translateY(-2px);
  }

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

  .card-hover {
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.2s;
  }

  .card-hover:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 24px -8px rgba(14, 116, 144, 0.18), 0 4px 8px -4px rgba(15, 23, 42, 0.08);
  }

  @media (max-width: 639px) {
    .section-title {
      font-size: 1.5rem;
      padding-left: 0.75rem;
    }
  }

  .no-scrollbar::-webkit-scrollbar {
    display: none;
  }

  .no-scrollbar {
    -ms-overflow-style: none;
    scrollbar-width: none;
  }

/* roulang page: article */
:root {
            --color-primary: #0e7490;
            --color-primary-light: #06b6d4;
            --color-primary-dark: #155e75;
            --color-accent: #f97316;
            --color-bg: #f8fafc;
            --color-surface: #ffffff;
            --color-heading: #0f172a;
            --color-text: #475569;
            --color-muted: #94a3b8;
            --color-border: #e2e8f0;
            --radius-card: 1rem;
            --radius-btn: 0.75rem;
            --shadow-card: 0 1px 3px rgba(0,0,0,.06);
            --shadow-hover: 0 12px 28px rgba(0,0,0,.09);
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            background-color: var(--color-bg);
            color: var(--color-text);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        a {
            text-decoration: none;
            color: var(--color-primary);
            transition: color .2s ease;
        }
        a:hover {
            color: var(--color-primary-dark);
        }
        .container-x {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        @media (min-width: 640px) {
            .container-x {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }
        @media (min-width: 1024px) {
            .container-x {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        .navbar-link {
            position: relative;
            padding-bottom: 0.25rem;
        }
        .navbar-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -0.25rem;
            height: 2px;
            border-radius: 9999px;
            background: linear-gradient(90deg, #06b6d4, #6366f1);
        }
        .article-body {
            font-size: 1rem;
            line-height: 1.9;
            color: var(--color-text);
            word-break: break-word;
        }
        .article-body p {
            margin-bottom: 1.5rem;
        }
        .article-body h2 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--color-heading);
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.6rem;
            border-bottom: 2px solid #e0f2fe;
        }
        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--color-heading);
            margin: 2rem 0 0.75rem;
        }
        .article-body ul {
            list-style: disc;
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .article-body ol {
            list-style: decimal;
            padding-left: 1.5rem;
            margin-bottom: 1.5rem;
        }
        .article-body li {
            margin-bottom: 0.4rem;
        }
        .article-body blockquote {
            border-left: 4px solid var(--color-primary);
            background-color: #f0f9ff;
            padding: 1rem 1.25rem;
            border-radius: 0 0.75rem 0.75rem 0;
            margin: 1.5rem 0;
            color: var(--color-text);
        }
        .article-body img {
            border-radius: 1rem;
            margin: 1.5rem 0;
            box-shadow: var(--shadow-card);
        }
        .article-body table {
            width: 100%;
            border: 1px solid var(--color-border);
            border-radius: 0.75rem;
            overflow: hidden;
            margin-bottom: 1.5rem;
            border-collapse: separate;
            border-spacing: 0;
        }
        .article-body th {
            background: #f1f5f9;
            padding: 0.75rem 1rem;
            text-align: left;
            font-weight: 600;
            color: var(--color-heading);
            border-bottom: 1px solid var(--color-border);
        }
        .article-body td {
            padding: 0.75rem 1rem;
            border-top: 1px solid #f1f5f9;
            border-bottom: 1px solid #f1f5f9;
        }
        .article-body a {
            text-decoration: underline;
            text-underline-offset: 3px;
            text-decoration-color: #99f6e4;
            text-decoration-thickness: 2px;
        }
        .article-body a:hover {
            text-decoration-color: var(--color-primary);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: 0.75rem;
            background: linear-gradient(135deg, #06b6d4, #0ea5e9, #4f46e5);
            color: #fff;
            font-weight: 600;
            padding: 0.75rem 1.75rem;
            font-size: 0.95rem;
            box-shadow: 0 4px 14px rgba(14, 116, 144, 0.25);
            transition: all .25s ease;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(14, 116, 144, 0.3);
            color: #fff;
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            border-radius: 0.75rem;
            border: 1.5px solid var(--color-border);
            background: #fff;
            color: var(--color-heading);
            font-weight: 500;
            padding: 0.7rem 1.5rem;
            font-size: 0.9rem;
            transition: all .25s ease;
        }
        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            box-shadow: 0 4px 12px rgba(14, 116, 144, 0.08);
            transform: translateY(-1px);
        }
        .btn-outline:active {
            transform: scale(0.98);
        }
        .badge {
            display: inline-flex;
            align-items: center;
            border-radius: 9999px;
            padding: 0.25rem 0.875rem;
            font-size: 0.75rem;
            font-weight: 600;
            line-height: 1.5;
        }
        .card-hover {
            transition: transform .3s ease, box-shadow .3s ease;
        }
        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .input-field {
            width: 100%;
            border-radius: 0.75rem;
            border: 1px solid var(--color-border);
            background: #fff;
            padding: 0.8rem 1rem;
            font-size: 0.9rem;
            color: var(--color-heading);
            outline: none;
            transition: border-color .2s, box-shadow .2s;
        }
        .input-field::placeholder {
            color: #94a3b8;
        }
        .input-field:focus {
            border-color: #06b6d4;
            box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.15);
        }
        .radio-check {
            transition: all .2s ease;
        }
        .mobile-menu-panel {
            transition: max-height .3s ease, opacity .3s ease;
            max-height: 0;
            opacity: 0;
            overflow: hidden;
        }
        .mobile-menu-panel.open {
            max-height: 500px;
            opacity: 1;
        }
        @media (max-width: 767px) {
            .desktop-nav {
                display: none;
            }
        }
        @media (min-width: 768px) {
            .mobile-menu-btn {
                display: none;
            }
        }

/* roulang page: category1 */
:root {
            --color-primary: #0e7490;
            --color-primary-light: #06b6d4;
            --color-promo: #f97316;
            --color-bg: #f8fafc;
            --color-text: #334155;
            --color-text-light: #94a3b8;
            --color-border: #e2e8f0;
            --radius-card: 1rem;
            --radius-btn: 0.75rem;
            --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.08);
            --shadow-hover: 0 12px 24px rgba(15, 23, 42, 0.10);
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', system-ui, -apple-system, 'Segoe UI', sans-serif;
            font-size: 16px;
            line-height: 1.75;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
        }
        a {
            text-decoration: none;
            color: var(--color-primary);
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--color-primary-light);
        }
        .container-x {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        @media (min-width: 640px) {
            .container-x {
                padding-left: 1.5rem;
                padding-right: 1.5rem;
            }
        }
        @media (min-width: 1024px) {
            .container-x {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        .navbar-link {
            position: relative;
            padding-bottom: 0.25rem;
        }
        .navbar-link.active {}
        .navbar-link:not(.active):hover {
            color: #0e7490;
        }
        .navbar-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, #06b6d4, #4f46e5);
        }
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.04em;
            color: var(--color-primary);
            background-color: rgba(14, 116, 144, 0.08);
            border-radius: 9999px;
            padding: 0.35rem 0.9rem;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 1.75rem;
            line-height: 1.3;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 0.5rem;
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 2rem;
            }
        }
        .section-title-bar {
            display: inline-block;
            width: 36px;
            height: 4px;
            border-radius: 9999px;
            background: linear-gradient(90deg, var(--color-primary-light), #4f46e5);
            margin-bottom: 0.75rem;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 0.75rem;
            background: linear-gradient(135deg, #0891b2, #2563eb);
            color: #ffffff;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 0.75rem 1.5rem;
            box-shadow: 0 4px 12px rgba(8, 145, 178, 0.25);
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-primary:hover {
            box-shadow: 0 8px 20px rgba(8, 145, 178, 0.35);
            transform: translateY(-2px);
            color: #ffffff;
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-primary:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.3);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            border-radius: 0.75rem;
            background: #ffffff;
            color: #0f172a;
            font-weight: 600;
            font-size: 0.9rem;
            padding: 0.75rem 1.5rem;
            border: 1.5px solid #e2e8f0;
            cursor: pointer;
            transition: all 0.2s ease;
        }
        .btn-outline:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            box-shadow: 0 4px 12px rgba(14, 116, 144, 0.1);
            transform: translateY(-2px);
        }
        .btn-outline:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(14, 116, 144, 0.15);
        }
        .card-hover {
            transition: transform 0.25s ease, box-shadow 0.25s ease;
        }
        .card-hover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .badge-promo {
            background: linear-gradient(135deg, #f97316, #f43f5e);
            color: #ffffff;
            font-size: 0.7rem;
            font-weight: 700;
            border-radius: 9999px;
            padding: 0.25rem 0.75rem;
            display: inline-block;
            letter-spacing: 0.03em;
        }
        .form-input {
            width: 100%;
            border-radius: 0.75rem;
            border: 1px solid #e2e8f0;
            background-color: #ffffff;
            padding: 0.75rem 1rem;
            font-size: 0.875rem;
            color: #1e293b;
            transition: border-color 0.2s ease, box-shadow 0.2s ease;
        }
        .form-input::placeholder {
            color: #94a3b8;
        }
        .form-input:focus {
            outline: none;
            border-color: #06b6d4;
            box-shadow: 0 0 0 3px rgba(6, 182, 212, 0.18);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, opacity 0.3s ease;
            opacity: 0;
        }
        .faq-item.open .faq-answer {
            max-height: 200px;
            opacity: 1;
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            color: var(--color-primary);
        }
        .faq-icon {
            transition: transform 0.3s ease, color 0.3s ease;
        }
        .hero-grid-bg {
            background-image: linear-gradient(rgba(14, 116, 144, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(14, 116, 144, 0.05) 1px, transparent 1px);
            background-size: 24px 24px;
        }
        @media (max-width: 640px) {
            .hidden-mobile {
                display: none !important;
            }
        }