/* roulang page: index */
:root {
      --primary: #2E7D32;
      --primary-hover: #1B5E20;
      --accent: #F57C00;
      --accent-hover: #e06d00;
      --bg-light: #FAFBF7;
      --bg-dark: #1B2A1E;
      --bg-footer: #1A231B;
      --text-body: #2C3E2D;
      --text-heading: #1A231B;
      --text-light: #FFFFFF;
      --text-muted: #BCC9BA;
      --border: #E0E8DB;
      --card-bg: #FFFFFF;
      --card-shadow: 0 2px 12px rgba(0,0,0,0.04);
      --card-hover-shadow: 0 8px 24px rgba(46,125,50,0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    button, .btn {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 0.5rem;
      transition: var(--transition);
      font-weight: 600;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    @media (max-width: 640px) {
      .container {
        padding: 0 16px;
      }
    }

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.96);
      backdrop-filter: blur(10px);
      z-index: 1000;
      height: 72px;
      border-bottom: 1px solid var(--border);
      transition: box-shadow 0.3s ease;
    }
    .site-header.scrolled {
      box-shadow: 0 1px 8px rgba(0,0,0,0.06);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo span {
      color: var(--text-heading);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }
    .nav-menu a {
      font-weight: 500;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }
    .nav-menu a:hover::after,
    .nav-menu a.active::after {
      width: 100%;
    }
    .btn-cta-nav {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(245,124,0,0.25);
    }
    .btn-cta-nav:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      padding: 10px;
    }
    .hamburger span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-heading);
      transition: 0.2s;
    }

    /* 移动端菜单 */
    @media (max-width: 1024px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        padding: 32px 20px;
        gap: 24px;
        transform: translateY(-120%);
        transition: transform 0.3s ease;
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
        z-index: 999;
      }
      .nav-menu.active {
        transform: translateY(0);
      }
      .hamburger {
        display: flex;
      }
    }
    @media (max-width: 640px) {
      .site-header {
        height: 56px;
      }
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    @media (max-width: 640px) {
      section {
        padding: 48px 0;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(180deg, #FAFBF7 0%, #E8F0E3 100%);
      padding-top: 120px;
      position: relative;
      overflow: hidden;
    }
    .hero .container {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 400px;
    }
    .hero-content h1 {
      font-size: 3rem;
      font-weight: 700;
      color: var(--text-heading);
      line-height: 1.3;
      margin-bottom: 1.2rem;
    }
    .hero-content .highlight {
      color: var(--primary);
      position: relative;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: var(--text-body);
      margin-bottom: 2rem;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 2rem;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-size: 1rem;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(46,125,50,0.3);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-sm);
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .trust-signal {
      display: flex;
      gap: 24px;
      font-size: 0.9rem;
      color: var(--text-body);
    }
    .hero-image {
      flex: 1 1 400px;
      border-radius: var(--radius-lg);
      overflow: hidden;
      transform: rotate(1deg);
      box-shadow: 0 20px 40px rgba(0,0,0,0.08);
    }
    @media (max-width: 768px) {
      .hero .container {
        flex-direction: column;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 2.2rem;
      }
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .feature-card {
      background: var(--card-bg);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      border-left: 4px solid var(--primary);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .feature-card:nth-child(even) {
      border-left-color: var(--accent);
    }
    .feature-card:hover {
      box-shadow: var(--card-hover-shadow);
      transform: translateY(-4px);
    }
    .feature-icon {
      font-size: 2rem;
      color: var(--primary);
      margin-bottom: 16px;
    }

    /* 功能分组 */
    .capability-row {
      display: flex;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
      flex-wrap: wrap;
    }
    .capability-text {
      flex: 1 1 300px;
    }
    .capability-image {
      flex: 1 1 300px;
      background: #eef3e8;
      border-radius: var(--radius-lg) 0 var(--radius-lg) 0;
      overflow: hidden;
    }

    /* 场景 */
    .scene-block {
      display: flex;
      gap: 48px;
      align-items: center;
      margin-bottom: 64px;
    }
    .scene-block.reverse {
      flex-direction: row-reverse;
    }
    .scene-img {
      flex: 1 1 300px;
      border-radius: 20px 8px 20px 8px;
      overflow: hidden;
    }
    .scene-text {
      flex: 1 1 300px;
    }

    /* 案例卡片 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 260px;
      background: white;
      padding: 24px;
      border-radius: var(--radius-md);
      scroll-snap-align: start;
      box-shadow: var(--card-shadow);
    }
    .case-stat {
      font-size: 2.2rem;
      font-weight: 700;
      color: var(--primary);
      font-family: var(--font-number);
    }

    /* 价格卡片 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-md);
      padding: 32px 24px;
      border: 1px solid var(--border);
      text-align: center;
    }
    .pricing-card.recommended {
      border: 2px solid var(--primary);
      position: relative;
    }
    .badge {
      background: var(--accent);
      color: white;
      font-size: 0.8rem;
      padding: 4px 12px;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    /* FAQ */
    .faq-item {
      background: white;
      border: 1px solid var(--border);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
    }
    .faq-question {
      width: 100%;
      padding: 16px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      background: transparent;
    }
    .faq-answer {
      padding: 0 24px 16px;
      display: none;
      background: #F8FAF5;
    }
    .faq-item.open .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-dark {
      background: var(--bg-dark);
      color: white;
      text-align: center;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
    }

    /* Footer */
    .site-footer {
      background: var(--bg-footer);
      color: var(--text-muted);
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
    }
    @media (max-width: 640px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }