/* roulang page: index */
:root {
      --deep-indigo: #0B1E3C;
      --deep-indigo-light: #152B4A;
      --electric-cyan: #00C2BA;
      --electric-cyan-hover: #00A8A1;
      --electric-cyan-10: rgba(0,194,186,0.1);
      --electric-cyan-5: rgba(0,194,186,0.05);
      --warm-gold: #C8A96E;
      --warm-gold-hover: #D4B88C;
      --bg-warm: #F7F5F2;
      --card-bg: #FFFFFF;
      --text-primary: #1E2530;
      --text-body: #3A3F47;
      --text-muted: #5A6069;
      --text-light: rgba(255,255,255,0.7);
      --text-footer: rgba(255,255,255,0.6);
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 2px 12px rgba(11,30,60,0.06);
      --shadow-card-hover: 0 8px 24px rgba(11,30,60,0.10);
      --shadow-glow-cyan: 0 0 12px rgba(0,194,186,0.4);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --radius-faq: 10px;
      --sidebar-width: 240px;
      --mobile-nav-height: 56px;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      color: var(--text-body);
      background-color: var(--bg-warm);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4, .font-heading {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      font-weight: 600;
      letter-spacing: -0.01em;
      color: var(--deep-indigo);
    }
    h1 {
      font-size: 3.2rem;
      font-weight: 700;
      letter-spacing: -0.02em;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.2rem;
      font-weight: 600;
      letter-spacing: -0.01em;
    }
    h3.card-title, .card-heading {
      font-size: 1.25rem;
      font-weight: 600;
    }
    .text-label, .badge-tag {
      font-size: 0.85rem;
      letter-spacing: 0.03em;
      text-transform: uppercase;
    }
    a {
      transition: color 0.2s ease, background-color 0.2s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .btn {
      border-radius: var(--radius-btn);
      padding: 0.75rem 2rem;
      font-weight: 600;
      transition: all 0.25s ease;
    }
    .btn-primary-custom {
      background-color: var(--electric-cyan);
      border: 2px solid var(--electric-cyan);
      color: #FFF;
    }
    .btn-primary-custom:hover {
      background-color: var(--electric-cyan-hover);
      border-color: var(--electric-cyan-hover);
      box-shadow: var(--shadow-glow-cyan);
      color: #FFF;
    }
    .btn-outline-indigo {
      background: transparent;
      border: 2px solid var(--deep-indigo);
      color: var(--deep-indigo);
    }
    .btn-outline-indigo:hover {
      background-color: var(--deep-indigo);
      border-color: var(--deep-indigo);
      color: #FFF;
    }
    .btn-gold {
      background-color: var(--warm-gold);
      border: 2px solid var(--warm-gold);
      color: var(--deep-indigo);
    }
    .btn-gold:hover {
      background-color: var(--warm-gold-hover);
      border-color: var(--warm-gold-hover);
      color: var(--deep-indigo);
    }
    /* 左侧 App Shell 导航 */
    .app-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background-color: var(--deep-indigo);
      display: flex;
      flex-direction: column;
      z-index: 1030;
      border-right: 1px solid var(--warm-gold);
      transition: transform 0.3s ease;
    }
    .sidebar-logo {
      padding: 1.8rem 1.5rem;
      font-size: 1.4rem;
      font-weight: 700;
      color: #FFF;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .sidebar-nav {
      flex: 1;
      padding: 1rem 0.8rem;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }
    .nav-link-item {
      color: var(--text-light);
      text-decoration: none;
      padding: 0.7rem 1rem;
      border-left: 3px solid transparent;
      font-size: 0.95rem;
      transition: all 0.2s;
      display: block;
      border-radius: 0 6px 6px 0;
    }
    .nav-link-item:hover, .nav-link-item.active {
      color: var(--electric-cyan);
      border-left-color: var(--electric-cyan);
      background-color: rgba(255,255,255,0.05);
    }
    .nav-link-item.active {
      color: #FFF;
      border-left-color: var(--electric-cyan);
      background-color: rgba(0,194,186,0.1);
    }
    .sidebar-footer-text {
      padding: 1.5rem;
      font-size: 0.75rem;
      color: rgba(255,255,255,0.4);
      text-align: center;
    }
    .main-content {
      margin-left: var(--sidebar-width);
      min-height: 100vh;
    }
    /* 移动端顶部导航 */
    .mobile-navbar {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--mobile-nav-height);
      background-color: var(--deep-indigo);
      z-index: 1040;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.2rem;
    }
    .menu-toggle {
      background: transparent;
      border: none;
      color: #FFF;
      font-size: 1.6rem;
      cursor: pointer;
    }
    .mobile-logo {
      color: #FFF;
      font-weight: 700;
      font-size: 1.3rem;
    }
    .drawer-overlay {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: rgba(0,0,0,0.5);
      z-index: 1050;
      display: none;
    }
    .drawer-menu {
      position: fixed;
      top: 0;
      left: 0;
      width: 280px;
      height: 100%;
      background: var(--deep-indigo);
      z-index: 1060;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      display: flex;
      flex-direction: column;
      padding: 2rem 1.5rem;
    }
    .drawer-menu.open {
      transform: translateX(0);
    }
    .drawer-close {
      align-self: flex-end;
      background: transparent;
      border: none;
      color: #FFF;
      font-size: 1.8rem;
      cursor: pointer;
      margin-bottom: 2rem;
    }
    /* 区块通用 */
    .section-padding {
      padding: 5rem 0;
    }
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* Hero */
    .hero-section {
      min-height: 85vh;
      display: flex;
      align-items: center;
      background-color: var(--bg-warm);
    }
    .hero-image {
      border-radius: 16px;
      box-shadow: var(--shadow-card);
      width: 100%;
      height: auto;
    }
    /* 亮点网格 */
    .highlight-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .highlight-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-card);
      transition: box-shadow 0.25s;
      border: none;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-card-hover);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background-color: var(--electric-cyan-10);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--electric-cyan);
      font-size: 1.5rem;
      margin-bottom: 1.2rem;
    }
    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 2rem;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: box-shadow 0.25s;
    }
    .case-card:hover {
      box-shadow: var(--shadow-card-hover);
    }
    .case-img {
      aspect-ratio: 3 / 2;
      object-fit: cover;
      transition: transform 0.3s ease;
      border-radius: 8px 8px 0 0;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-tag {
      background-color: var(--electric-cyan-10);
      color: var(--deep-indigo);
      padding: 0.2rem 0.8rem;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
    }
    /* 方案对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 2rem;
      position: relative;
    }
    .compare-col {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-card);
    }
    .compare-highlight {
      background-color: var(--electric-cyan-5);
      border-left: 4px solid var(--electric-cyan);
    }
    .compare-icon-fail {
      color: #adb5bd;
      margin-right: 0.5rem;
    }
    .compare-icon-success {
      color: var(--electric-cyan);
      margin-right: 0.5rem;
    }
    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    .accordion-faq .accordion-item {
      border: none;
      background: var(--card-bg);
      border-radius: var(--radius-faq);
      margin-bottom: 0.8rem;
      box-shadow: var(--shadow-card);
    }
    .accordion-faq .accordion-button {
      font-weight: 600;
      font-size: 1.1rem;
      color: var(--deep-indigo);
      background: transparent;
      border-radius: var(--radius-faq) !important;
      padding: 1.2rem 1.5rem;
      box-shadow: none;
      border-left: 4px solid var(--deep-indigo);
    }
    .accordion-faq .accordion-button:not(.collapsed) {
      background-color: transparent;
      color: var(--electric-cyan);
      border-left-color: var(--electric-cyan);
    }
    .accordion-faq .accordion-body {
      background: #FAF9F7;
      color: #4A5058;
      padding: 1.2rem 1.5rem;
    }
    /* CTA Banner */
    .cta-banner {
      background: linear-gradient(135deg, var(--deep-indigo) 0%, var(--deep-indigo-light) 100%);
      padding: 4rem 0;
    }
    /* Footer */
    .footer-section {
      background-color: var(--deep-indigo);
      color: var(--text-footer);
    }
    .footer-title {
      color: #FFF;
      font-size: 1rem;
      font-weight: 600;
      margin-bottom: 1rem;
    }
    .footer-link {
      color: var(--text-footer);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s;
    }
    .footer-link:hover {
      color: var(--electric-cyan);
    }
    /* 响应式 */
    @media (max-width: 991.98px) {
      .app-sidebar {
        transform: translateX(-100%);
      }
      .main-content {
        margin-left: 0;
        padding-top: var(--mobile-nav-height);
      }
      .mobile-navbar {
        display: flex;
      }
      .drawer-overlay.show {
        display: block;
      }
      h1 {
        font-size: 2.5rem;
      }
      h2 {
        font-size: 1.9rem;
      }
    }
    @media (max-width: 767.98px) {
      .hero-section .row {
        flex-direction: column;
      }
      .highlight-grid {
        grid-template-columns: 1fr 1fr;
      }
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .compare-grid {
        grid-template-columns: 1fr;
      }
      .section-padding {
        padding: 3rem 0;
      }
      h1 {
        font-size: 2.2rem;
      }
      .icon-circle {
        width: 40px;
        height: 40px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
      }
    }