/* roulang page: index */
:root {
      --primary: #1B8A3B;
      --primary-dark: #146B2E;
      --primary-light: #E8F5EC;
      --accent-orange: #F15A24;
      --accent-yellow: #FFB81C;
      --text-dark: #1E1E1E;
      --text-gray: #5C5C5C;
      --bg-light: #F5F5F5;
      --white: #FFFFFF;
      --border-light: #E8E8E8;
      --radius-card: 12px;
      --radius-button: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-card-hover: 0 8px 24px rgba(0,0,0,0.10);
      --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-sans);
      color: var(--text-dark);
      background-color: var(--white);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
    }
    h1 { font-size: clamp(32px, 5vw, 48px); letter-spacing: -0.5px; }
    h2 { font-size: clamp(28px, 4vw, 36px); }
    h3 { font-size: 20px; font-weight: 600; }
    h4 { font-size: 18px; font-weight: 600; }
    a, button, input {
      font-family: inherit;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    section {
      padding: 100px 0;
    }
    .bg-light {
      background-color: var(--bg-light);
    }
    /* 导航栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: var(--white);
      height: 72px;
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo i {
      font-size: 28px;
      color: var(--primary);
    }
    .nav-menu {
      display: flex;
      gap: 8px;
      list-style: none;
      align-items: center;
    }
    .nav-menu a {
      display: inline-block;
      padding: 8px 20px;
      border-radius: 20px;
      color: var(--text-dark);
      text-decoration: none;
      font-weight: 500;
      transition: var(--transition-smooth);
    }
    .nav-menu a:hover,
    .nav-menu a.active {
      background: var(--primary-light);
      color: var(--primary);
    }
    .nav-cta {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 8px 22px;
      border-radius: 20px;
      font-weight: 600;
      transition: var(--transition-smooth);
      text-decoration: none;
    }
    .nav-cta:hover {
      background: var(--primary-light);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.08);
      }
      .nav-menu.active {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .nav-cta.desktop-only {
        display: none;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #1B8A3B 0%, #146B2E 100%);
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      width: 100%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.08;
      mix-blend-mode: soft-light;
    }
    .hero-content {
      display: flex;
      align-items: center;
      gap: 60px;
      position: relative;
      z-index: 2;
      flex-wrap: wrap;
    }
    .hero-text {
      flex: 1 1 400px;
    }
    .hero h1 {
      color: white;
      margin-bottom: 24px;
    }
    .hero p {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 16px 40px;
      border-radius: var(--radius-button);
      font-weight: 600;
      text-decoration: none;
      border: none;
      cursor: pointer;
      transition: var(--transition-smooth);
    }
    .btn-primary:hover { background: #D94A1A; }
    .btn-ghost {
      border: 2px solid white;
      color: white;
      padding: 14px 38px;
      border-radius: var(--radius-button);
      font-weight: 600;
      text-decoration: none;
      background: transparent;
      transition: var(--transition-smooth);
    }
    .btn-ghost:hover { background: rgba(255,255,255,0.15); }
    .hero-image {
      flex: 1 1 350px;
    }
    .hero-image img {
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    /* 卡片通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
      border-color: var(--primary);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 32px;
    }
    .section-title {
      text-align: center;
      margin-bottom: 16px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-gray);
      max-width: 600px;
      margin: 0 auto 40px;
    }
    .feature-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin: 80px 0;
    }
    .feature-row.reverse {
      flex-direction: row-reverse;
    }
    .feature-text {
      flex: 1;
    }
    .feature-img {
      flex: 1;
    }
    .feature-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .list-check li {
      list-style: none;
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .list-check i {
      color: var(--primary);
    }
    .data-block {
      display: flex;
      justify-content: center;
      gap: 60px;
      flex-wrap: wrap;
      margin: 40px 0;
    }
    .data-item {
      text-align: center;
    }
    .data-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-orange);
    }
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
      cursor: pointer;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      font-weight: 600;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-gray);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .cta-band {
      background: var(--primary-dark);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
      gap: 40px;
      padding: 60px 0 40px;
    }
    .footer-bottom {
      border-top: 1px solid var(--border-light);
      padding: 20px 0;
      text-align: center;
      color: var(--text-gray);
      font-size: 14px;
    }
    @media (max-width: 768px) {
      .feature-row, .feature-row.reverse {
        flex-direction: column;
      }
    }