/* roulang page: index */
:root {
      --primary: #1A3C2A;
      --accent: #E85D04;
      --bg: #FAFAF7;
      --dark-bg: #0F1E17;
      --text: #1A1A1A;
      --text-soft: #5C5C5C;
      --white: #FFFFFF;
      --border: #E5E5E0;
      --radius-lg: 12px;
      --radius-md: 8px;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 28px rgba(0,0,0,0.08);
      --transition: 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;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-body);
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      outline: none;
      background: transparent;
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      height: 72px;
      display: flex;
      align-items: center;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid transparent;
      transition: background 0.3s, border-color 0.3s, box-shadow 0.3s;
    }
    .header.scrolled {
      background: rgba(255,255,255,0.95);
      border-bottom: 1px solid rgba(0,0,0,0.05);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent);
      border-radius: 50%;
      position: relative;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: var(--text);
      padding: 4px 0;
      position: relative;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--accent);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--accent);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-size: 16px;
      transition: background var(--transition), transform 0.2s;
      display: inline-block;
    }
    .btn-primary:hover {
      background: #D14D00;
      transform: scale(1.03);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
      font-weight: 600;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      transition: all var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-weight: 600;
      transition: all var(--transition);
    }
    .btn-ghost:hover {
      background: white;
      color: var(--primary);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: transparent;
      border: none;
    }
    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      transition: all 0.3s;
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.98);
      backdrop-filter: blur(12px);
      padding: 24px 32px;
      flex-direction: column;
      gap: 20px;
      border-bottom: 1px solid var(--border);
      z-index: 99;
    }
    .mobile-menu a {
      font-size: 18px;
      font-weight: 500;
    }
    /* Hero */
    .hero {
      min-height: 100vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-color: var(--dark-bg);
      position: relative;
      display: flex;
      align-items: center;
      padding-top: 72px;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(15,30,23,0.8) 0%, rgba(26,60,42,0.6) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 500px;
      color: white;
    }
    .hero-text h1 {
      font-size: 56px;
      font-weight: 700;
      line-height: 1.1;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-visual {
      flex: 1 1 400px;
      display: flex;
      justify-content: center;
    }
    .hero-badge {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      padding: 24px;
      border-radius: var(--radius-lg);
      color: white;
      font-weight: 600;
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 600;
      margin-bottom: 16px;
      color: var(--primary);
    }
    .section-desc {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 48px;
    }
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .advantage-card {
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      transition: all var(--transition);
    }
    .advantage-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--accent);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      border: 2px solid var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
    }
    .feature-row {
      display: flex;
      align-items: center;
      gap: 64px;
      margin-bottom: 100px;
      flex-wrap: wrap;
    }
    .feature-img {
      flex: 1 1 400px;
      border-radius: var(--radius-lg);
      overflow: hidden;
    }
    .feature-text {
      flex: 1 1 400px;
    }
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(2,1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--white);
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border);
      transition: all var(--transition);
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 32px;
    }
    .case-stat {
      background: #F5F5F0;
      padding: 40px 24px;
      border-radius: var(--radius-lg);
      text-align: center;
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border);
      padding: 24px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
      font-size: 20px;
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-soft);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .cta-section {
      background: var(--dark-bg);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .footer {
      background: var(--primary);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 1024px) {
      .container {
        padding: 0 24px;
      }
      .nav-links {
        display: none;
      }
      .hamburger {
        display: flex;
      }
      .grid-3, .cases-grid {
        grid-template-columns: 1fr 1fr;
      }
      .feature-row {
        flex-direction: column;
      }
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px !important; }
      .section-title { font-size: 28px; }
      .grid-3, .scenario-grid, .cases-grid, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
    }
    @media (max-width: 480px) {
      .container {
        padding: 0 16px;
      }
      .btn-primary, .btn-outline {
        padding: 12px 20px;
        width: 100%;
        text-align: center;
      }
    }