/* roulang page: index */
:root {
      --primary: #0A7A3E;
      --primary-dark: #06552B;
      --accent: #F5A623;
      --accent-light: #FFC107;
      --deep: #1A2B1F;
      --bg: #F8FAF5;
      --bg-light: #EDF1E9;
      --card: #FFFFFF;
      --text: #2C3A2F;
      --text-secondary: #6B7A6E;
      --white: #FFFFFF;
      --red: #D94A4A;
      --radius-card: 16px;
      --radius-btn: 30px;
      --radius-input: 12px;
      --shadow-sm: 0 4px 20px rgba(26,43,31,0.04);
      --shadow-hover: 0 8px 30px rgba(26,43,31,0.08);
      --transition: 200ms cubic-bezier(0.2, 0.0, 0, 1.0);
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --spacing-lg: 120px;
      --spacing-md: 80px;
      --container-padding: 40px;
      --header-height: 64px;
    }
    * {
      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);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 var(--container-padding);
    }
    h1, h2, h3, h4 {
      font-weight: 600;
      line-height: 1.3;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all var(--transition);
    }
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      z-index: 1000;
      box-shadow: 0 1px 0 rgba(0,0,0,0.02);
      transition: box-shadow var(--transition);
    }
    .header.scrolled {
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
    }
    .header .container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 100%;
    }
    .logo {
      font-size: 28px;
      font-weight: 700;
      color: var(--deep);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo span {
      color: var(--primary);
      font-weight: 800;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }
    .nav-links a {
      font-size: 1rem;
      font-weight: 500;
      color: var(--text);
      padding: 6px 0;
      position: relative;
      white-space: nowrap;
      transition: color var(--transition);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      font-size: 1.6rem;
      color: var(--deep);
      background: none;
      border: none;
      padding: 8px;
    }
    /* 移动端导航遮罩 */
    .mobile-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100vh;
      background: rgba(26,43,31,0.95);
      backdrop-filter: blur(10px);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 32px;
      z-index: 999;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.3s ease;
    }
    .mobile-nav.active {
      opacity: 1;
      pointer-events: auto;
    }
    .mobile-nav a {
      color: white;
      font-size: 1.8rem;
      font-weight: 500;
      transition: color 0.2s;
    }
    .mobile-nav a:hover {
      color: var(--accent);
    }
    .mobile-close {
      position: absolute;
      top: 24px;
      right: 24px;
      background: none;
      border: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }

    /* 板块间距 */
    section {
      padding: var(--spacing-lg) 0;
    }
    @media (max-width: 768px) {
      section {
        padding: var(--spacing-md) 0;
      }
      :root {
        --container-padding: 16px;
      }
    }

    /* 英雄区 */
    .hero {
      margin-top: var(--header-height);
      display: flex;
      align-items: center;
      min-height: 90vh;
      background: radial-gradient(circle at 20% 30%, rgba(10,122,62,0.03) 0%, transparent 60%);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 60px;
      align-items: center;
    }
    .hero-content h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      color: var(--deep);
      margin-bottom: 24px;
    }
    .hero-content h1 span {
      color: var(--primary);
    }
    .hero-content .subtitle {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 500px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      box-shadow: 0 4px 12px rgba(10,122,62,0.25);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      border: 1px solid transparent;
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10,122,62,0.3);
    }
    .btn-outline {
      border: 1.5px solid var(--deep);
      color: var(--deep);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(26,43,31,0.04);
      transform: translateY(-2px);
    }
    .trust-text {
      display: flex;
      gap: 24px;
      color: var(--text-secondary);
      font-size: 0.9rem;
      font-weight: 500;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      height: 420px;
      box-shadow: var(--shadow-hover);
      transition: transform 0.3s ease;
      position: relative;
    }
    .hero-image:hover {
      transform: translateY(-6px);
    }
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .hero-content h1 {
        font-size: 40px;
      }
      .hero-image {
        height: 320px;
        order: -1;
      }
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .highlight-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .highlight-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .highlight-card.featured {
      background: var(--deep);
      color: white;
      grid-column: span 2;
    }
    .highlight-card.featured h3 {
      color: white;
    }
    .highlight-card.featured p {
      color: rgba(255,255,255,0.8);
    }
    .icon-circle {
      width: 48px;
      height: 48px;
      background: rgba(10,122,62,0.08);
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.5rem;
    }
    .featured .icon-circle {
      background: rgba(255,255,255,0.15);
      color: var(--accent);
    }
    .highlight-card h3 {
      font-size: 1.5rem;
    }
    @media (max-width: 768px) {
      .highlights-grid {
        grid-template-columns: 1fr;
      }
      .highlight-card.featured {
        grid-column: span 1;
      }
    }

    /* 数据条 */
    .stats-bar {
      background: var(--bg-light);
      border-radius: 24px;
      padding: 40px 0;
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      text-align: center;
    }
    .stat-item h4 {
      font-size: 2.5rem;
      color: var(--primary);
      font-weight: 700;
    }
    .stat-item p {
      color: var(--text-secondary);
    }

    /* 案例瀑布 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .case-card {
      background: var(--card);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition);
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 180px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 20px;
    }
    .case-content h4 {
      margin-bottom: 8px;
      font-weight: 600;
    }
    .case-date {
      color: var(--text-secondary);
      font-size: 0.8rem;
    }
    @media (max-width: 768px) {
      .case-grid {
        grid-template-columns: 1fr;
      }
    }

    /* 对比表 */
    .comparison-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      margin-top: 40px;
    }
    .compare-card {
      background: var(--card);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .compare-card.negative {
      opacity: 0.7;
      background: #f4f6f1;
    }
    .compare-card.positive {
      border: 2px solid var(--primary);
      background: #f9fdf7;
    }
    .compare-list {
      list-style: none;
      margin-top: 24px;
    }
    .compare-list li {
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .fa-check-circle {
      color: var(--primary);
    }
    .fa-times-circle {
      color: #aaa;
    }
    @media (max-width: 768px) {
      .comparison-row {
        grid-template-columns: 1fr;
      }
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 40px auto 0;
    }
    .faq-item {
      border-bottom: 1px solid #E0E5DC;
      padding: 20px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      font-size: 1.1rem;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      color: var(--text);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-secondary);
      padding-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-top: 12px;
    }
    .faq-icon {
      color: var(--primary);
      font-size: 1.3rem;
    }

    /* CTA */
    .cta-section {
      background: var(--deep);
      color: white;
      text-align: center;
      border-radius: 32px;
      padding: 80px 24px;
      margin-top: 40px;
    }
    .cta-section h2 {
      font-size: 2.5rem;
      margin-bottom: 16px;
    }
    .btn-accent {
      background: var(--accent);
      color: #1A2B1F;
      padding: 16px 42px;
      border-radius: 40px;
      font-weight: 700;
      font-size: 1.2rem;
      margin-top: 28px;
      display: inline-block;
      box-shadow: 0 8px 18px rgba(245,166,35,0.3);
    }
    .btn-accent:hover {
      transform: scale(1.04);
    }

    /* 页脚 */
    .footer {
      background: var(--deep);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
      margin-top: 80px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
    }
    .footer a:hover {
      color: var(--accent);
    }
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hamburger {
        display: block;
      }
      .nav-links {
        display: none;
      }
    }