/* roulang page: index */
:root {
      --primary-ink: #1B3A2D;
      --panda-white: #F7F7F2;
      --bamboo-green: #6DA544;
      --energy-orange: #E94E2C;
      --text-dark: #333333;
      --text-muted: #666666;
      --border-light: #E5E5E5;
      --bg-soft: #F9FBF6;
      --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
      --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.12);
      --radius-lg: 16px;
      --radius-md: 12px;
      --radius-pill: 30px;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
      --font-en: "Inter", "Poppins", sans-serif;
      --transition-smooth: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
      --container-max: 1280px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-cn);
      color: var(--text-dark);
      background-color: var(--panda-white);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.3;
      letter-spacing: -0.2px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition-smooth);
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, .btn {
      cursor: pointer;
      font-family: var(--font-cn);
      font-weight: 600;
      transition: var(--transition-smooth);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      outline: none;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 16px rgba(0, 0, 0, 0.04);
      z-index: 1000;
      height: 72px;
      display: flex;
      align-items: center;
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }

    .logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-ink);
      letter-spacing: -0.5px;
    }

    .logo-icon {
      font-size: 2rem;
      color: var(--primary-ink);
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 2rem;
    }

    .nav-link {
      font-size: 1rem;
      font-weight: 500;
      color: var(--primary-ink);
      position: relative;
      padding: 8px 0;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--bamboo-green);
      transition: width 0.25s ease;
    }

    .nav-link:hover {
      color: var(--bamboo-green);
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--energy-orange);
      color: white;
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(233, 78, 44, 0.25);
      font-size: 0.95rem;
    }

    .btn-primary:hover {
      background: #C43D1F;
      transform: scale(1.03);
      box-shadow: 0 8px 18px rgba(233, 78, 44, 0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary-ink);
      color: var(--primary-ink);
      border-radius: var(--radius-pill);
      padding: 12px 28px;
      font-weight: 600;
    }

    .btn-outline:hover {
      background: var(--primary-ink);
      color: white;
    }

    .hamburger {
      display: none;
      font-size: 1.8rem;
      color: var(--primary-ink);
      background: none;
      border: none;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 75%;
        max-width: 320px;
        height: 100vh;
        background: var(--bamboo-green);
        flex-direction: column;
        justify-content: center;
        gap: 2.5rem;
        transition: right 0.35s ease;
        box-shadow: -8px 0 24px rgba(0,0,0,0.2);
        z-index: 1100;
      }
      .nav-menu.active {
        right: 0;
      }
      .nav-link {
        color: white;
        font-size: 1.4rem;
      }
      .nav-link::after {
        background: white;
      }
      .hamburger {
        display: block;
        z-index: 1200;
      }
      .header-cta {
        display: none;
      }
      .mobile-cta {
        display: block;
        margin-top: 20px;
      }
    }

    /* Hero */
    .hero {
      background: linear-gradient(135deg, rgba(27, 58, 45, 0.88) 0%, rgba(27, 58, 45, 0.7) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 100vh;
      display: flex;
      align-items: center;
      color: white;
      padding-top: 72px;
      position: relative;
    }

    .hero-content {
      max-width: 720px;
    }

    .hero h1 {
      font-size: 3.2rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 1.5rem;
    }

    .hero .highlight {
      color: var(--bamboo-green);
      background: rgba(255,255,255,0.1);
      padding: 0 8px;
      border-radius: 8px;
    }

    .hero p {
      font-size: 1.25rem;
      opacity: 0.9;
      margin-bottom: 2.5rem;
      max-width: 600px;
    }

    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }

    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.2rem;
      }
      .hero p {
        font-size: 1.1rem;
      }
    }

    /* 板块通用 */
    section {
      padding: 90px 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3.5rem;
    }

    .section-title h2 {
      font-size: 2.2rem;
      color: var(--primary-ink);
      margin-bottom: 0.8rem;
    }

    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
    }

    /* 核心优势卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }

    .advantage-card {
      background: white;
      border-radius: var(--radius-lg);
      padding: 36px 28px;
      box-shadow: var(--shadow-card);
      text-align: center;
      transition: var(--transition-smooth);
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }

    .icon-circle {
      width: 70px;
      height: 70px;
      background: #EAF4E0;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      color: var(--primary-ink);
      font-size: 2rem;
    }

    /* 服务图文交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 70px;
    }

    .service-row.reverse {
      flex-direction: row-reverse;
    }

    .service-img {
      flex: 1;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
    }

    .service-text {
      flex: 1;
    }

    .service-text h3 {
      font-size: 1.8rem;
      margin-bottom: 1rem;
      color: var(--primary-ink);
    }

    @media (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
    }

    /* 数据块 */
    .stats {
      background: #F4F8EE;
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }

    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--energy-orange);
      font-family: var(--font-en);
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 18px 0;
    }

    .faq-question {
      font-weight: 600;
      font-size: 1.15rem;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      color: var(--primary-ink);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-muted);
      padding-right: 20px;
    }

    .faq-answer.open {
      max-height: 200px;
      margin-top: 12px;
    }

    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #1B3A2D 0%, #2A5A3A 100%);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    .footer {
      background: var(--primary-ink);
      color: #CCCCCC;
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    @media (max-width: 768px) {
      .footer-grid, .stats-grid {
        grid-template-columns: 1fr;
      }
    }