/* roulang page: index */
/* ===== 设计变量 ===== */
    :root {
      --primary-green: #0A9E3A;
      --champion-gold: #D4A017;
      --deep-dark: #0D1117;
      --frost-white: #F7F8FA;
      --text-dark: #1E1E1E;
      --text-mid: #5A5A5A;
      --card-white: #FFFFFF;
      --border-soft: #E0E8E2;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(10,158,58,0.12);
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --transition: all 0.25s ease;
      --font-cn: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-num: "Inter", "SF Pro Display", sans-serif;
    }

    /* ===== 基础重置 ===== */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-cn);
      color: var(--text-dark);
      background-color: #ffffff;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

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

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

    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: transparent;
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    ul, ol {
      list-style: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 工具类 */
    .section-padding {
      padding: 100px 0;
    }

    .gradient-text {
      background: linear-gradient(135deg, #0A9E3A 0%, #D4A017 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .gradient-bg {
      background: linear-gradient(135deg, #0A9E3A 0%, #D4A017 100%);
    }

    /* ===== 导航 Header ===== */
    .main-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .logo-icon {
      font-size: 30px;
      color: var(--primary-green);
    }

    .logo-text {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-green);
      letter-spacing: 0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-link {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-dark);
      position: relative;
      padding: 4px 0;
    }

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

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

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

    .btn-primary {
      background: linear-gradient(135deg, #0A9E3A 0%, #D4A017 100%);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      box-shadow: 0 4px 12px rgba(10,158,58,0.3);
    }

    .btn-primary:hover {
      filter: brightness(1.1);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(10,158,58,0.4);
    }

    .mobile-toggle {
      display: none;
      font-size: 26px;
      color: var(--primary-green);
      background: transparent;
      border: none;
    }

    /* 移动端导航 */
    @media (max-width: 768px) {
      .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--frost-white);
        flex-direction: column;
        gap: 24px;
        padding: 32px 24px;
        box-shadow: 0 8px 20px rgba(0,0,0,0.08);
        transform: translateY(-150%);
        opacity: 0;
        transition: all 0.35s ease;
        z-index: 999;
      }

      .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
      }

      .mobile-toggle {
        display: block;
      }

      .header-cta {
        display: none;
      }

      .mobile-cta {
        width: 100%;
      }
    }

    /* ===== 首屏 Hero ===== */
    .hero-section {
      padding: 140px 0 100px;
      background: #ffffff;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
      margin-bottom: 16px;
    }

    .hero-content .subtitle {
      font-size: 18px;
      color: var(--text-mid);
      max-width: 520px;
      margin-bottom: 36px;
    }

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

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

    .btn-outline:hover {
      background: rgba(10,158,58,0.08);
    }

    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      min-height: 420px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.12);
      position: relative;
    }

    /* 移动端 Hero */
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
      }
      .hero-content h1 {
        font-size: 34px;
      }
      .hero-content .subtitle {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-buttons {
        justify-content: center;
      }
      .hero-image {
        min-height: 300px;
      }
    }

    /* ===== 板块标题 ===== */
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title h2 {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .title-underline {
      width: 70px;
      height: 4px;
      background: linear-gradient(90deg, #0A9E3A, #D4A017);
      margin: 0 auto;
      border-radius: 2px;
    }

    /* ===== 服务卡片 ===== */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-white);
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
      border: 1px solid transparent;
    }

    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--border-soft);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(10,158,58,0.1);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 28px;
      color: var(--primary-green);
    }

    .service-card h3 {
      font-size: 22px;
      margin-bottom: 12px;
    }

    .service-card p {
      color: var(--text-mid);
    }

    @media (max-width: 992px) {
      .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 600px) {
      .services-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ===== 数据徽章 ===== */
    .stats-wall {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .stat-badge {
      background: linear-gradient(145deg, #f0faf3, #ffffff);
      border-radius: var(--radius-card);
      padding: 32px 16px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }

    .stat-number {
      font-family: var(--font-num);
      font-size: 44px;
      font-weight: 700;
      background: linear-gradient(135deg, #0A9E3A, #D4A017);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .stat-label {
      font-size: 15px;
      color: var(--text-mid);
      margin-top: 8px;
    }

    @media (max-width: 768px) {
      .stats-wall {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    /* ===== 案例卡片 ===== */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }

    .case-info {
      padding: 22px;
    }

    .case-tag {
      display: inline-block;
      background: rgba(10,158,58,0.1);
      color: var(--primary-green);
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 8px;
    }

    @media (max-width: 992px) {
      .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .cases-grid {
        grid-template-columns: 1fr;
      }
    }

    /* ===== 流程步骤 ===== */
    .steps-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
    }

    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }

    .step-circle {
      width: 48px;
      height: 48px;
      background: linear-gradient(135deg, #0A9E3A, #D4A017);
      border-radius: 50%;
      color: white;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
    }

    @media (max-width: 768px) {
      .steps-row {
        flex-direction: column;
        gap: 32px;
      }
    }

    /* ===== FAQ 手风琴 ===== */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      border-bottom: 1px solid var(--border-soft);
      padding: 18px 0;
    }

    .faq-question {
      font-size: 18px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      padding: 8px 0;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      color: var(--text-mid);
      padding-left: 0;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 10px;
    }

    /* ===== 全局 CTA ===== */
    .cta-dark {
      background: var(--deep-dark);
      color: white;
      text-align: center;
    }

    .cta-dark h2 {
      font-size: 38px;
      color: white;
    }

    .cta-dark .btn-primary {
      margin-top: 28px;
      padding: 18px 42px;
      font-size: 18px;
    }

    /* ===== 页脚 ===== */
    .footer {
      background: #1A1D22;
      color: #b0b8c1;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      padding: 70px 0 40px;
    }

    .footer-links a {
      display: block;
      color: #b0b8c1;
      margin-bottom: 8px;
    }

    .copyright {
      border-top: 1px solid #2d3238;
      text-align: center;
      padding: 20px 0;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    @media (max-width: 500px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }