/* roulang page: index */
:root {
      --deep-blue: #1B3A5C;
      --deep-blue-hover: #12293F;
      --gold: #C49A2B;
      --gold-hover: #A67E1E;
      --bg-light: #FAFBFD;
      --bg-subtle: #F1F4F8;
      --card-bg: #FFFFFF;
      --border-light: #E5EAF0;
      --text-heading: #0F263D;
      --text-body: #3A4A5C;
      --text-muted: #6B7B8D;
      --white: #FFFFFF;
      --shadow-sm: 0 2px 12px rgba(27, 58, 92, 0.06);
      --shadow-md: 0 8px 28px rgba(27, 58, 92, 0.10);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --transition: all 0.25s ease;
      --font-heading: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-body: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", "DIN", sans-serif;
      --max-width: 1280px;
      --header-height: 68px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: var(--header-height);
    }

    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-body);
      background-color: var(--bg-light);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
    }

    .container {
      max-width: var(--max-width);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 100;
      box-shadow: 0 1px 0 transparent;
      transition: box-shadow 0.2s;
    }

    .site-header.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 1.3rem;
      color: var(--deep-blue);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }

    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--deep-blue);
      mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M4 4h6v6H4V4zm10 0h6v6h-6V4zM4 14h6v6H4v-6zm10 0h6v6h-6v-6z" fill="black" fill-rule="evenodd"/></svg>') center/contain no-repeat;
      -webkit-mask: url('data:image/svg+xml;utf8,<svg viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg"><path d="M4 4h6v6H4V4zm10 0h6v6h-6V4zM4 14h6v6H4v-6zm10 0h6v6h-6v-6z" fill="black" fill-rule="evenodd"/></svg>') center/contain no-repeat;
      background-color: var(--deep-blue);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
      font-weight: 500;
      color: var(--text-body);
    }

    .nav-links a {
      transition: var(--transition);
      position: relative;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--deep-blue);
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .search-trigger {
      background: none;
      border: none;
      font-size: 1.2rem;
      color: var(--text-muted);
      transition: var(--transition);
    }

    .search-trigger:hover {
      color: var(--deep-blue);
    }

    .btn-login {
      background: none;
      border: none;
      font-weight: 500;
      color: var(--text-body);
      transition: var(--transition);
    }

    .btn-login:hover {
      color: var(--deep-blue);
    }

    .btn-primary {
      background: var(--deep-blue);
      color: white;
      border: none;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .btn-primary:hover {
      background: var(--deep-blue-hover);
      transform: translateY(-1px);
    }

    .btn-gold {
      background: var(--gold);
      color: white;
    }

    .btn-gold:hover {
      background: var(--gold-hover);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--deep-blue);
      color: var(--deep-blue);
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: var(--deep-blue);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-blue);
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }

    .section-title {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 2.2rem;
      color: var(--text-heading);
      text-align: center;
      margin-bottom: 16px;
    }

    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 620px;
      margin: 0 auto 48px;
    }

    /* Hero */
    .hero {
      padding-top: calc(var(--header-height) + 60px);
      padding-bottom: 80px;
    }

    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }

    .hero-text {
      flex: 1;
    }

    .hero-text h1 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 3rem;
      color: var(--text-heading);
      line-height: 1.3;
    }

    .hero-text p {
      font-size: 1.15rem;
      margin: 20px 0 28px;
      color: var(--text-body);
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .hero-image {
      flex: 1;
      position: relative;
    }

    .hero-image img {
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-md);
      width: 100%;
      height: auto;
    }

    .float-badge {
      position: absolute;
      bottom: 20px;
      left: -20px;
      background: white;
      padding: 14px 22px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      font-weight: 700;
      font-size: 1.2rem;
      color: var(--deep-blue);
      display: flex;
      align-items: baseline;
      gap: 6px;
    }

    .float-badge span {
      font-family: var(--font-number);
      font-size: 2rem;
      color: var(--gold);
      line-height: 1;
    }

    /* 功能网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 32px;
      transition: var(--transition);
    }

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

    .feature-icon {
      font-size: 2.4rem;
      color: var(--deep-blue);
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-family: var(--font-heading);
      font-weight: 600;
      font-size: 1.3rem;
      color: var(--text-heading);
      margin-bottom: 10px;
    }

    .feature-card p {
      color: var(--text-muted);
      margin-bottom: 14px;
    }

    .link-arrow {
      font-weight: 600;
      color: var(--deep-blue);
      display: inline-flex;
      align-items: center;
      gap: 4px;
      transition: var(--transition);
    }

    .link-arrow:hover {
      gap: 8px;
    }

    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }

    .scenario-row.reverse {
      flex-direction: row-reverse;
    }

    .scenario-img {
      flex: 1;
    }

    .scenario-img img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-light);
    }

    .scenario-content {
      flex: 1;
    }

    .tag {
      display: inline-block;
      background: rgba(196, 154, 43, 0.1);
      color: var(--gold);
      font-weight: 600;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.85rem;
      margin-bottom: 12px;
    }

    .scenario-content h3 {
      font-family: var(--font-heading);
      font-weight: 700;
      font-size: 1.8rem;
      color: var(--text-heading);
    }

    .check-list {
      list-style: none;
      margin-top: 16px;
    }

    .check-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 8px;
    }

    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 28px;
      border: 1px solid var(--border-light);
      transition: var(--transition);
    }

    .case-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }

    .case-tag {
      font-size: 0.8rem;
      background: #EEF2F6;
      color: var(--deep-blue);
      padding: 2px 10px;
      border-radius: 16px;
      display: inline-block;
      margin-bottom: 14px;
    }

    .case-metric {
      font-family: var(--font-number);
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--gold);
    }

    /* 信任墙 */
    .logo-wall {
      display: flex;
      justify-content: center;
      align-items: center;
      flex-wrap: wrap;
      gap: 40px;
      filter: grayscale(1);
      opacity: 0.7;
    }

    .logo-wall img {
      height: 36px;
      width: auto;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }

    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      cursor: pointer;
      color: var(--text-heading);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-body);
      background: #F8FAFC;
      margin-top: 8px;
      padding: 0 16px;
      border-left: 3px solid var(--deep-blue);
    }

    .faq-item.open .faq-answer {
      max-height: 160px;
      padding: 16px;
    }

    /* CTA底栏 */
    .cta-section {
      background: var(--deep-blue);
      padding: 80px 0;
      text-align: center;
      color: white;
      position: relative;
    }

    .cta-section h2 {
      font-size: 2.2rem;
      font-weight: 700;
    }

    /* 页脚 */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }

    .footer-bottom {
      border-top: 1px solid var(--border-light);
      margin-top: 40px;
      padding-top: 20px;
      display: flex;
      justify-content: space-between;
      color: var(--text-muted);
      font-size: 0.85rem;
    }

    @media (max-width: 1024px) {
      .hero-grid, .scenario-row {
        flex-direction: column;
        gap: 32px;
      }
      .features-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links, .header-actions .btn-login, .header-actions .btn-primary {
        display: none;
      }
      .hamburger {
        display: block;
      }
      .features-grid, .cases-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-text h1 {
        font-size: 2rem;
      }
    }