/* roulang page: index */
:root {
      --primary: #0F9B4E;
      --primary-dark: #0B7A3D;
      --accent: #F5A623;
      --bg: #F7F8FA;
      --surface: #FFFFFF;
      --dark-surface: #1E2A32;
      --text-primary: #1A1A1A;
      --text-secondary: #5C6B7A;
      --border: #E2E8F0;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.1);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text-primary);
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      text-decoration: none;
      display: flex;
      align-items: center;
      gap: 6px;
      letter-spacing: -0.3px;
    }
    .logo svg {
      width: 28px;
      height: 28px;
      fill: var(--primary);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-secondary);
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .btn-nav {
      background: var(--primary);
      color: white !important;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s;
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      color: white !important;
    }
    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }
    .burger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-primary);
      border-radius: 2px;
      transition: 0.2s;
    }
    /* 移动导航 */
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 64px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 24px 0;
        gap: 24px;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        transform: translateY(-120%);
        opacity: 0;
        transition: 0.25s ease;
        pointer-events: none;
      }
      .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
      }
      .burger {
        display: flex;
      }
      .btn-nav {
        width: fit-content;
        margin: 0 auto;
      }
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    @media (max-width: 768px) {
      section {
        padding: 64px 0;
      }
      .site-header {
        height: 56px;
      }
      .logo {
        font-size: 18px;
      }
    }
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      display: flex;
      align-items: center;
      background: linear-gradient(rgba(15,155,78,0.82), rgba(11,122,61,0.9)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      margin-top: 64px;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      display: flex;
      justify-content: center;
    }
    .hero-right img {
      max-width: 100%;
      height: auto;
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.3);
    }
    .hero h1 {
      font-size: 42px;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: white;
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-block;
      transition: 0.2s;
      border: none;
      cursor: pointer;
    }
    .btn-primary:hover {
      background: #f0f0f0;
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      transition: 0.2s;
    }
    .btn-secondary:hover {
      background: rgba(255,255,255,0.15);
    }
    @media (max-width: 768px) {
      .hero {
        margin-top: 56px;
        text-align: center;
      }
      .hero-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 32px;
      }
      .btn-group {
        flex-direction: column;
        align-items: center;
      }
      .btn-primary, .btn-secondary {
        width: 100%;
        text-align: center;
      }
    }
    /* 卡片 */
    .card {
      background: var(--surface);
      border-radius: var(--radius-card);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: 0.25s ease;
    }
    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    /* 优势 */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .advantage-icon {
      font-size: 40px;
      margin-bottom: 16px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    @media (max-width: 1024px) {
      .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 640px) {
      .advantages-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据条 */
    .stats-band {
      background: var(--dark-surface);
      color: white;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 24px;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 800;
      color: var(--accent);
    }
    .stat-label {
      font-size: 16px;
      opacity: 0.8;
    }
    @media (max-width: 640px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    /* 指南步骤 */
    .steps {
      display: flex;
      flex-direction: column;
      gap: 32px;
      margin-top: 40px;
    }
    .step-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .step-num {
      background: var(--primary);
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      flex-shrink: 0;
    }
    .step-content {
      background: var(--surface);
      padding: 20px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      flex: 1;
    }
    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border);
    }
    .faq-question {
      background: white;
      padding: 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: 0.2s;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #f9fafb;
      padding: 0 20px;
    }
    .faq-answer p {
      padding: 16px 0;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      color: white;
      text-align: center;
      padding: 60px 20px;
    }
    /* 页脚 */
    .footer {
      background: var(--dark-surface);
      color: rgba(255,255,255,0.7);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    .footer h4 {
      color: white;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 26px;
      }
    }