/* roulang page: index */
/* ----- CSS 变量与重置基础 ----- */
    :root {
      --leaf-green: #2E7D32;
      --leaf-light: #388E3C;
      --warm-orange: #F57C00;
      --warm-deep: #EF6C00;
      --frost-gray: #78909C;
      --deep-text: #37474F;
      --soft-bg: #F9FBF8;
      --gray-bg: #EEF2EB;
      --dark-footer: #263238;
      --white: #FFFFFF;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 4px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-smooth: 0.25s ease;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Inter", "Roboto", sans-serif;
      color: var(--deep-text);
      background-color: var(--soft-bg);
      line-height: 1.8;
      font-size: 1rem;
      scroll-behavior: smooth;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: 12px;
    }
    a, button, .btn {
      cursor: pointer;
      text-decoration: none;
      transition: var(--transition-smooth);
      font-family: inherit;
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
      color: #1e2b20;
    }
    h1 { font-size: 3rem; font-weight: 700; }
    h2 { font-size: 2rem; margin-bottom: 0.75rem; }
    h3 { font-size: 1.25rem; font-weight: 600; }
    section {
      padding: 80px 0;
    }
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 0.75rem 2rem;
      font-weight: 600;
      border-radius: var(--radius-btn);
      font-size: 1rem;
      border: 2px solid transparent;
      background: transparent;
      transition: all 0.2s ease;
    }
    .btn-primary {
      background: var(--warm-orange);
      color: white;
      border-color: var(--warm-orange);
      box-shadow: 0 2px 8px rgba(245,124,0,0.2);
    }
    .btn-primary:hover {
      background: var(--warm-deep);
      border-color: var(--warm-deep);
      transform: scale(1.02);
      box-shadow: 0 6px 14px rgba(245,124,0,0.3);
    }
    .btn-outline {
      border: 2px solid var(--leaf-green);
      color: var(--leaf-green);
      background: transparent;
    }
    .btn-outline:hover {
      background: rgba(46,125,50,0.08);
      border-color: var(--leaf-light);
    }
    .btn-white {
      background: white;
      color: var(--leaf-green);
      border-color: white;
      font-weight: 700;
    }
    /* 导航 - 沉浸式透明到白底变换 */
    #mainNav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      transition: background 0.3s ease, box-shadow 0.3s ease;
      background: transparent;
      padding: 16px 0;
    }
    #mainNav.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 4px 20px rgba(0,0,0,0.05);
      backdrop-filter: blur(8px);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      transition: color 0.3s;
      white-space: nowrap;
    }
    #mainNav.scrolled .logo {
      color: var(--leaf-green);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: white;
      font-weight: 500;
      font-size: 1rem;
      text-decoration: none;
      position: relative;
      padding: 0.2rem 0;
    }
    #mainNav.scrolled .nav-links a {
      color: var(--deep-text);
    }
    .nav-links a:hover {
      color: var(--warm-orange);
    }
    #mainNav.scrolled .nav-links a:hover {
      color: var(--warm-orange);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: white;
      transition: color 0.3s;
    }
    #mainNav.scrolled .hamburger {
      color: var(--leaf-green);
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: var(--leaf-green);
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 2rem;
      z-index: 999;
      font-size: 1.5rem;
    }
    .mobile-menu a {
      color: white;
      font-weight: 600;
    }
    .mobile-menu .close-menu {
      position: absolute;
      top: 20px;
      right: 25px;
      font-size: 2rem;
      background: none;
      border: none;
      color: white;
    }
    /* Hero 区域 */
    .hero {
      position: relative;
      min-height: 95vh;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center;
      color: white;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(46,125,50,0.7) 0%, rgba(46,125,50,0.3) 100%);
    }
    .hero-content {
      position: relative;
      max-width: 800px;
      padding: 0 20px;
      z-index: 2;
    }
    .hero h1 {
      color: white;
      font-size: 3.2rem;
      margin-bottom: 1.5rem;
      text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .hero p {
      font-size: 1.2rem;
      margin-bottom: 2.5rem;
      color: rgba(255,255,255,0.95);
    }
    .hero-buttons {
      display: flex;
      gap: 1.2rem;
      justify-content: center;
      flex-wrap: wrap;
    }
    /* 板块通用 */
    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }
    .section-title h2 {
      display: inline-block;
      position: relative;
    }
    .section-title h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--warm-orange);
      margin: 0.8rem auto 0;
      border-radius: 4px;
    }
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .card {
      background: white;
      border-radius: var(--radius-card);
      padding: 28px 22px;
      box-shadow: var(--shadow-card);
      transition: var(--transition-smooth);
    }
    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .card-img {
      width: 100%;
      height: 180px;
      object-fit: cover;
      border-radius: 8px;
      margin-bottom: 20px;
    }
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 3rem;
      margin-bottom: 4rem;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-img {
      flex: 1;
    }
    .case-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 20px;
    }
    .case-stat {
      background: white;
      padding: 2rem 1rem;
      border-radius: 12px;
      text-align: center;
      box-shadow: var(--shadow-card);
    }
    .case-stat .number {
      font-size: 2.4rem;
      font-weight: 700;
      color: var(--warm-orange);
    }
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .pricing-card {
      background: white;
      border-radius: 16px;
      padding: 2.5rem 1.5rem;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: 0.2s;
    }
    .pricing-card.featured {
      border: 2px solid var(--leaf-green);
      transform: scale(1.02);
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      margin-bottom: 12px;
      padding: 0 20px;
    }
    .faq-question {
      width: 100%;
      background: transparent;
      border: none;
      padding: 1.2rem 0;
      font-size: 1.1rem;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--deep-text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
    }
    .cta-section {
      background: var(--leaf-green);
      color: white;
      text-align: center;
      padding: 80px 20px;
      border-radius: 24px 24px 0 0;
      margin-top: 40px;
    }
    footer {
      background: var(--dark-footer);
      color: #cfd8dc;
      padding: 3rem 20px;
    }
    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2,1fr); }
      .case-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      h1 { font-size: 2rem; }
      .hero h1 { font-size: 2.2rem; }
      .cards-grid, .pricing-grid { grid-template-columns: 1fr; }
      .scenario-row, .scenario-row.reverse { flex-direction: column; }
      .case-grid { grid-template-columns: 1fr 1fr; }
      section { padding: 60px 0; }
    }
    .visible { display: flex !important; }