/* roulang page: index */
:root {
      --primary-green: #00C853;
      --deep-green: #0B2B1F;
      --energy-orange: #FF6D00;
      --bg-light: #F5F7FA;
      --card-white: #FFFFFF;
      --text-dark: #1A1A1A;
      --text-muted: #5A6A72;
      --border-light: #E0E6ED;
      --radius-card: 20px;
      --radius-btn: 50px;
      --shadow-sm: 0 10px 30px -10px rgba(0,0,0,0.08);
      --shadow-hover: 0 18px 36px -12px rgba(0,0,0,0.15);
      --transition: all 0.25s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

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

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 导航 */
    .nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.04);
      box-shadow: 0 4px 12px 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: 8px;
      text-decoration: none;
      color: var(--deep-green);
      font-weight: 700;
      font-size: 1.5rem;
    }
    .logo i {
      font-size: 2rem;
      color: var(--primary-green);
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 36px;
    }
    .nav-links a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      transition: var(--transition);
      position: relative;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary-green);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: var(--transition);
    }
    .nav-links a:hover::after {
      width: 100%;
    }

    .btn-primary {
      background: var(--primary-green);
      color: white;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      box-shadow: 0 6px 14px rgba(0,200,83,0.3);
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--deep-green);
      box-shadow: 0 8px 20px rgba(11,43,31,0.35);
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      gap: 6px;
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--primary-green);
      color: white;
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--deep-green);
      cursor: pointer;
    }

    /* Hero */
    .hero {
      padding: 80px 0 100px;
      background: linear-gradient(90deg, #FFFFFF 0%, #F5F7FA 100%);
      position: relative;
      overflow: hidden;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .hero-text h1 {
      font-weight: 700;
      font-size: clamp(2.8rem, 6vw, 4.2rem);
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--deep-green);
      margin-bottom: 1.2rem;
    }
    .hero-text p {
      font-size: 1.2rem;
      color: var(--text-muted);
      margin-bottom: 2.2rem;
      max-width: 480px;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 400px;
      box-shadow: var(--shadow-sm);
      position: relative;
      background-blend-mode: overlay;
      background-color: rgba(245,247,250,0.2);
    }

    /* 板块通用 */
    .section {
      padding: 100px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 60px;
    }
    .section-title h2 {
      font-weight: 600;
      font-size: 2.2rem;
      color: var(--deep-green);
      display: inline-block;
      position: relative;
      margin-bottom: 0.5rem;
    }
    .section-title h2::after {
      content: '';
      display: block;
      width: 60px;
      height: 3px;
      background: var(--primary-green);
      margin: 12px auto 0;
      border-radius: 3px;
    }
    .section-title p {
      color: var(--text-muted);
      font-size: 1.1rem;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 30px;
    }
    .service-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      cursor: pointer;
      border: 1px solid transparent;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary-green);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: #E8F5E9;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--primary-green);
      font-size: 2rem;
    }
    .service-card h3 {
      font-weight: 600;
      font-size: 1.4rem;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 数据徽章 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .stat-item {
      background: #E8F5E9;
      border-radius: 16px;
      padding: 28px 16px;
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--energy-orange);
      line-height: 1.2;
    }
    .stat-label {
      color: var(--deep-green);
      font-weight: 500;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
    }
    .case-card {
      background: var(--card-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .case-content {
      padding: 20px;
    }
    .case-tag {
      background: transparent;
      border: 1px solid var(--primary-green);
      color: var(--primary-green);
      padding: 4px 14px;
      border-radius: 30px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }
    .case-content h4 {
      font-weight: 600;
      margin: 8px 0;
    }

    /* 流程 */
    .steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 30px;
    }
    .step {
      text-align: center;
    }
    .step-icon {
      font-size: 2.4rem;
      color: var(--primary-green);
      margin-bottom: 16px;
    }
    .step h4 {
      font-weight: 600;
      margin-bottom: 8px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: #F5F7FA;
      border-radius: 12px;
      margin-bottom: 16px;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 12px;
      cursor: pointer;
      background: #F5F7FA;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1.1rem;
    }
    .faq-question i {
      color: var(--primary-green);
    }
    .faq-answer {
      padding: 0 24px 20px 60px;
      color: var(--text-muted);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* CTA */
    .cta-block {
      background: var(--deep-green);
      border-radius: 32px;
      padding: 70px 40px;
      text-align: center;
      color: white;
      margin: 60px 0;
    }
    .cta-block h2 {
      font-size: 2.2rem;
      margin-bottom: 16px;
    }

    /* Footer */
    .footer {
      background: var(--deep-green);
      color: rgba(255,255,255,0.85);
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 1.6rem;
      font-weight: 700;
      color: white;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 16px;
    }
    .footer a {
      color: rgba(255,255,255,0.7);
      text-decoration: none;
      display: block;
      margin-bottom: 10px;
    }
    .footer a:hover {
      color: var(--primary-green);
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.15);
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: rgba(255,255,255,0.5);
    }

    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero { padding: 40px 0 60px; }
      .section { padding: 60px 0; }
      .cards-grid, .steps-grid { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: 1fr 1fr; }
      .case-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 520px) {
      .stats-grid { grid-template-columns: 1fr; }
    }