/* roulang page: index */
:root {
      --primary: #0A8F3C;
      --primary-dark: #054A20;
      --accent: #F05423;
      --bg-paper: #FAF9F6;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-mid: #5A5A5A;
      --text-light: #8A8A8A;
      --border-subtle: rgba(0,0,0,0.04);
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 20px;
      --radius-btn: 12px;
      --radius-badge: 12px;
      --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-mono: 'JetBrains Mono', 'Courier New', monospace;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-paper);
      color: var(--text-dark);
      line-height: 1.75;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    /* 导航 */
    .main-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: var(--white);
      border-bottom: 1px solid var(--border-subtle);
      height: 72px;
      z-index: 100;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 24px;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .logo svg {
      width: 34px;
      height: 34px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      position: relative;
      padding: 4px 0;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-subscribe {
      background: var(--accent);
      color: white;
      padding: 10px 24px;
      border-radius: 24px;
      font-weight: 600;
      font-size: 15px;
      transition: background 0.25s ease, transform 0.25s ease;
      display: inline-block;
    }
    .btn-subscribe:hover {
      background: #D9481A;
      transform: translateY(-2px);
    }
    .mobile-nav {
      display: none;
    }
    /* Hero */
    .hero {
      padding: 140px 0 100px;
      background: linear-gradient(135deg, rgba(10,143,60,0.04) 0%, rgba(5,74,32,0.06) 100%);
    }
    .hero-grid {
      display: flex;
      gap: 48px;
      align-items: center;
    }
    .hero-left {
      flex: 0 0 58%;
    }
    .hero-right {
      flex: 0 0 38%;
      position: relative;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-dark);
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .cta-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: background 0.25s, transform 0.25s, box-shadow 0.25s;
      box-shadow: 0 4px 12px rgba(240,84,35,0.3);
    }
    .btn-primary:hover {
      background: #D9481A;
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(240,84,35,0.4);
    }
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-block;
      transition: all 0.25s;
    }
    .btn-secondary:hover {
      background: var(--primary);
      color: white;
      transform: translateY(-2px);
    }
    .hero-card {
      background: var(--white);
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-md);
    }
    .hero-card img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .data-badge {
      position: absolute;
      bottom: -12px;
      right: -12px;
      background: var(--primary-dark);
      color: white;
      padding: 12px 20px;
      border-radius: var(--radius-badge);
      font-weight: 700;
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      box-shadow: var(--shadow-md);
    }
    .data-badge .number {
      font-family: var(--font-mono);
      font-size: 28px;
      line-height: 1.2;
    }
    .data-badge .unit {
      font-size: 13px;
      opacity: 0.9;
    }
    /* 亮点 */
    .highlights {
      padding: 100px 0;
    }
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 48px;
      letter-spacing: -0.5px;
    }
    .grid-3x2 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-subtle);
      transition: transform 0.25s, box-shadow 0.25s;
    }
    .highlight-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .icon-wrap {
      width: 48px;
      height: 48px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .highlight-card p {
      font-size: 14px;
      color: var(--text-mid);
      margin-bottom: 18px;
      line-height: 1.6;
    }
    .badge-light {
      background: rgba(10,143,60,0.08);
      color: var(--primary-dark);
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 14px;
      display: inline-block;
      font-family: var(--font-mono);
    }
    /* 案例瀑布 */
    .cases {
      padding: 80px 0 100px;
      background: rgba(250,249,246,0.8);
    }
    .masonry {
      columns: 3;
      column-gap: 32px;
    }
    .case-card {
      break-inside: avoid;
      background: var(--white);
      border-radius: var(--radius-card);
      overflow: hidden;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.3s, box-shadow 0.3s;
      border: 1px solid var(--border-subtle);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img {
      width: 100%;
      height: auto;
      object-fit: cover;
    }
    .case-content {
      padding: 22px 20px 20px;
    }
    .case-content h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .case-date {
      font-size: 12px;
      color: var(--text-light);
      margin-bottom: 10px;
    }
    .case-summary {
      font-size: 14px;
      color: var(--text-mid);
      line-height: 1.5;
    }
    /* 对比 */
    .compare {
      padding: 100px 0;
    }
    .compare-grid {
      display: flex;
      gap: 40px;
      background: var(--white);
      border-radius: 28px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .compare-col {
      flex: 1;
    }
    .compare-col h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 24px;
    }
    .compare-item {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 18px;
    }
    .icon-check {
      color: var(--primary);
      font-weight: 700;
    }
    /* FAQ */
    .faq {
      padding: 80px 0;
    }
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .faq-item {
      background: #f0f0f0;
      border-radius: 12px;
      padding: 16px 20px;
      cursor: pointer;
      transition: background 0.2s;
      border-left: 3px solid transparent;
    }
    .faq-item.active {
      background: white;
      border-left: 3px solid var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .faq-q {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
    }
    .faq-a {
      margin-top: 12px;
      font-size: 16px;
      color: var(--text-mid);
      display: none;
    }
    .faq-item.active .faq-a {
      display: block;
    }
    /* CTA */
    .global-cta {
      background: linear-gradient(135deg, #0A8F3C 0%, #054A20 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    .cta-form {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-top: 28px;
      flex-wrap: wrap;
    }
    .cta-input {
      padding: 14px 20px;
      border-radius: 12px;
      border: none;
      width: 280px;
      font-size: 16px;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-dark);
      color: rgba(255,255,255,0.8);
      padding: 60px 0 30px;
    }
    .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: white;
    }
    @media (max-width: 1023px) {
      .hero-grid {
        flex-direction: column;
      }
      .grid-3x2 {
        grid-template-columns: repeat(2,1fr);
      }
      .masonry {
        columns: 2;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 767px) {
      .container {
        padding: 0 20px;
      }
      .main-nav .nav-links {
        display: none;
      }
      .mobile-nav {
        display: flex;
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 -4px 12px rgba(0,0,0,0.06);
        justify-content: space-around;
        padding: 8px 12px;
        height: 64px;
        z-index: 99;
      }
      .mobile-nav a {
        display: flex;
        flex-direction: column;
        align-items: center;
        font-size: 11px;
        color: var(--text-mid);
        gap: 4px;
      }
      .grid-3x2, .masonry {
        grid-template-columns: 1fr;
        columns: 1;
      }
      .compare-grid {
        flex-direction: column;
      }
      .hero h1 {
        font-size: 36px;
      }
    }