/* roulang page: index */
:root {
      --primary-deep: #1E2D24;
      --accent-amber: #E8A838;
      --accent-rust: #C25A3C;
      --bg-warm: #FAF7F2;
      --bg-lightgray: #F0EDE8;
      --card-bg: #FFFFFF;
      --text-primary: #1E1E1E;
      --text-secondary: #5C5C5C;
      --text-reverse: #FAF7F2;
      --border-light: #E5E0D8;
      --border-input: #D5CFC6;
      --shadow-card: 0 2px 16px rgba(30,45,36,0.06);
      --shadow-hover: 0 8px 32px rgba(30,45,36,0.12);
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-input: 6px;
      --radius-large: 16px;
      --transition-default: 0.25s ease;
      --font-title: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      --font-number: 'DIN Alternate', 'PingFang SC', sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      background-color: var(--bg-warm);
    }

    body {
      font-family: var(--font-body);
      font-weight: 400;
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-primary);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

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

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

    button, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250,247,242,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      border-bottom: 1px solid transparent;
    }

    .site-header.scrolled {
      background: rgba(250,247,242,0.96);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border-light);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary-deep);
      letter-spacing: 0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      color: var(--accent-amber);
      font-size: 24px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-menu a {
      font-weight: 500;
      font-size: 16px;
      color: var(--text-secondary);
      position: relative;
      padding: 6px 0;
      transition: color 0.2s;
    }

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

    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-amber);
      transition: width 0.25s ease;
    }

    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--accent-amber);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: none;
      cursor: pointer;
      transition: 0.25s ease;
      box-shadow: 0 2px 8px rgba(232,168,56,0.18);
      letter-spacing: 0.3px;
      white-space: nowrap;
    }

    .btn-primary:hover {
      background: #d9992b;
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(232,168,56,0.28);
      color: var(--primary-deep);
    }

    .btn-outline {
      background: transparent;
      border: 1.5px solid var(--primary-deep);
      color: var(--primary-deep);
      font-weight: 600;
      padding: 10px 24px;
      border-radius: var(--radius-button);
      transition: 0.25s ease;
      cursor: pointer;
    }
    .btn-outline:hover {
      background: rgba(30,45,36,0.05);
      border-color: var(--accent-amber);
      color: var(--accent-amber);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--primary-deep);
      transition: 0.2s;
      border-radius: 2px;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--primary-deep);
        flex-direction: column;
        justify-content: center;
        align-items: flex-start;
        padding: 48px 32px;
        gap: 28px;
        transition: right 0.35s ease;
        box-shadow: -8px 0 24px rgba(0,0,0,0.2);
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-menu a {
        color: var(--text-reverse);
        font-size: 20px;
        font-weight: 500;
      }
      .nav-menu a::after {
        background: var(--accent-amber);
      }
      .hamburger {
        display: flex;
        z-index: 1001;
      }
      .header-cta {
        display: none;
      }
    }

    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    h2 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 36px;
      line-height: 44px;
      margin-bottom: 16px;
      color: var(--primary-deep);
      position: relative;
      display: inline-block;
    }
    h2::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 60px;
      height: 4px;
      background: var(--accent-amber);
      border-radius: 2px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      max-width: 680px;
      margin-top: 16px;
      font-size: 18px;
    }

    /* Hero */
    .hero {
      padding: 140px 0 100px;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 80% 30%, rgba(232,168,56,0.08) 0%, transparent 70%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 48px;
      line-height: 56px;
      color: var(--primary-deep);
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .trust-badges {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .badge-placeholder {
      width: 72px;
      height: 36px;
      background: var(--bg-lightgray);
      border-radius: 6px;
      opacity: 0.7;
    }
    .hero-image {
      background: rgba(30,45,36,0.06);
      border-radius: 24px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 380px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      box-shadow: var(--shadow-card);
    }
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .hero h1 {
        font-size: 36px;
        line-height: 44px;
      }
    }

    /* 非对称优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-top: 48px;
    }
    .adv-wide {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      display: flex;
      flex-direction: column;
      transition: 0.3s;
    }
    .adv-wide:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .adv-narrow-group {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-narrow {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 28px 32px;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
      border-top: 3px solid var(--accent-amber);
    }
    .adv-narrow:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      color: var(--accent-rust);
      font-size: 24px;
      margin-bottom: 16px;
    }
    @media (max-width: 768px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 服务分组 选项卡 */
    .tabs-nav {
      display: flex;
      gap: 8px;
      margin: 40px 0 24px;
      flex-wrap: wrap;
    }
    .tab-btn {
      padding: 10px 24px;
      background: transparent;
      border: 1px solid var(--border-light);
      border-radius: 30px;
      font-weight: 600;
      cursor: pointer;
      transition: 0.2s;
      color: var(--text-secondary);
    }
    .tab-btn.active {
      background: var(--primary-deep);
      color: var(--text-reverse);
      border-color: var(--primary-deep);
    }
    .tab-panel {
      display: none;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      background: var(--card-bg);
      border-radius: var(--radius-large);
      padding: 32px;
      box-shadow: var(--shadow-card);
    }
    .tab-panel.active {
      display: grid;
    }
    .tab-img {
      background: #e0dbd2;
      border-radius: 12px;
      min-height: 220px;
      background-image: url('/assets/images/coverpic/cover-2.webp');
      background-size: cover;
    }
    @media (max-width: 768px) {
      .tab-panel {
        grid-template-columns: 1fr;
      }
    }

    /* 场景卡片 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .scenario-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.3s;
    }
    .scenario-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .scenario-content {
      padding: 24px;
    }
    .badge-rust {
      background: var(--accent-rust);
      color: white;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 20px;
      display: inline-block;
      margin-bottom: 8px;
    }
    @media (max-width: 768px) {
      .scenario-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 数据跑马灯 */
    .marquee-stats {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 32px;
      margin-top: 48px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 40px;
      color: var(--accent-rust);
    }

    /* FAQ 双列 */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 20px 24px;
      box-shadow: var(--shadow-card);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      margin-top: 0;
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 16px;
      padding-top: 16px;
      border-top: 1px solid var(--border-light);
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }

    /* CTA 深色 */
    .cta-dark {
      background: var(--primary-deep);
      text-align: center;
      padding: 80px 0;
      color: var(--text-reverse);
    }
    .cta-dark h2 {
      color: white;
    }
    .cta-dark h2::after {
      background: var(--accent-amber);
      left: 50%;
      transform: translateX(-50%);
    }

    /* 页脚 */
    .site-footer {
      background: var(--primary-deep);
      color: var(--text-reverse);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer-links a {
      display: block;
      margin-bottom: 8px;
      color: #ccc;
    }
    .footer-links a:hover {
      color: var(--accent-amber);
    }
    .copyright {
      border-top: 1px solid #2c3a30;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 14px;
      opacity: 0.7;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }

    @media (prefers-reduced-motion: reduce) {
      * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
      }
    }