/* roulang page: index */
:root {
      --primary-deep-olive: #2E4A2E;
      --secondary-warm-sand: #D4C5A9;
      --accent-electric-orange: #FF6B35;
      --neutral-dark: #1E1E1E;
      --neutral-mid: #6B6B6B;
      --neutral-light-bg: #F5F3EF;
      --white: #FFFFFF;
      --success-green: #2E7D32;
      --danger-red: #C62828;
      --border-light: #E0DBD3;
      --shadow-sm: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-h1: 600 2.75rem/1.2 "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-h2: 600 1.9rem/1.3 "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-h3: 600 1.25rem/1.4 "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-body: 400 1rem/1.7 "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-small: 0.9rem/1.5 "PingFang SC", "Microsoft YaHei", sans-serif;
      --font-btn: 600 0.95rem/1 "PingFang SC", "Microsoft YaHei", sans-serif;
      letter-spacing: 0.01em;
    }

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

    body {
      font: var(--font-body);
      background-color: var(--neutral-light-bg);
      color: var(--neutral-dark);
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

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

    button, .btn, input, textarea {
      font-family: inherit;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏 */
    .main-header {
      background: var(--white);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      position: sticky;
      top: 0;
      z-index: 40;
      padding: 12px 0;
    }

    .nav-grid {
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 700;
      font-size: 1.7rem;
      color: var(--primary-deep-olive);
      letter-spacing: 1px;
    }
    .logo-icon {
      font-size: 2rem;
      color: var(--accent-electric-orange);
    }

    .nav-chips {
      display: flex;
      gap: 12px;
      align-items: center;
    }

    .nav-chip {
      background: transparent;
      color: var(--neutral-dark);
      padding: 8px 18px;
      border-radius: 40px;
      font-weight: 500;
      font-size: 0.95rem;
      transition: all 0.2s ease;
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .nav-chip:hover {
      background: #f0ede6;
      border-bottom: 2px solid var(--accent-electric-orange);
    }
    .nav-chip.active {
      background: var(--accent-electric-orange);
      color: white;
      border-color: var(--accent-electric-orange);
      font-weight: 600;
    }

    .header-cta-btn {
      background: var(--accent-electric-orange);
      color: white;
      padding: 10px 24px;
      border-radius: 40px;
      font-weight: 600;
      font-size: 0.95rem;
      border: none;
      transition: all 0.2s;
      white-space: nowrap;
      margin-left: 16px;
    }
    .header-cta-btn:hover {
      background: #e85d2a;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(255,107,53,0.3);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep-olive);
    }

    /* 区块间距 */
    section {
      padding: 80px 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 40px;
      font: var(--font-h2);
      color: var(--primary-deep-olive);
    }

    /* Hero */
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 40px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      min-height: 400px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 24px;
      position: relative;
      overflow: hidden;
      box-shadow: var(--shadow-hover);
    }
    .hero-right::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(46,74,46,0.4) 0%, rgba(0,0,0,0.3) 100%);
    }
    .hero-h1 {
      font: var(--font-h1);
      color: var(--primary-deep-olive);
      margin-bottom: 18px;
    }
    .hero-sub {
      font-size: 1.3rem;
      color: var(--neutral-mid);
      margin-bottom: 20px;
    }
    .hero-desc {
      color: var(--neutral-dark);
      margin-bottom: 32px;
      font-size: 1.05rem;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-electric-orange);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font: var(--font-btn);
      transition: all 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: #e85d2a;
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(255,107,53,0.3);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-electric-orange);
      color: var(--accent-electric-orange);
      padding: 14px 28px;
      border-radius: var(--radius-btn);
      font: var(--font-btn);
      transition: all 0.2s;
    }
    .btn-outline:hover {
      background: rgba(255,107,53,0.05);
      transform: translateY(-2px);
    }

    /* 亮点网格 */
    .highlights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .highlight-card {
      background: var(--white);
      border-radius: var(--radius-card);
      padding: 36px 28px;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s;
      text-align: center;
    }
    .highlight-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
    }
    .highlight-icon {
      font-size: 3rem;
      color: var(--accent-electric-orange);
      margin-bottom: 20px;
    }
    .highlight-card h3 {
      font: var(--font-h3);
      color: var(--primary-deep-olive);
      margin-bottom: 12px;
    }

    /* 案例瀑布 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }
    .case-card {
      background: var(--white);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: 0.25s;
      position: relative;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 220px;
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .case-overlay {
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(transparent, rgba(0,0,0,0.7));
      padding: 20px;
      color: white;
    }
    .case-tag {
      background: var(--accent-electric-orange);
      color: white;
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 0.8rem;
      display: inline-block;
      margin-bottom: 6px;
    }

    /* 方案对比 */
    .solutions-compare {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .plan-card {
      background: var(--secondary-warm-sand);
      border-radius: var(--radius-card);
      padding: 40px 28px;
      box-shadow: var(--shadow-sm);
    }
    .plan-card.featured {
      background: var(--white);
      border: 2px solid var(--accent-electric-orange);
    }
    .plan-title {
      font: var(--font-h3);
      color: var(--primary-deep-olive);
    }
    .plan-list {
      list-style: none;
      margin: 24px 0;
    }
    .plan-list li {
      margin-bottom: 12px;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 16px 0;
    }
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--primary-deep-olive);
      font-size: 1.1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #faf9f6;
      border-radius: 8px;
      margin-top: 8px;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: var(--primary-deep-olive);
      color: white;
      text-align: center;
      border-radius: 24px;
      padding: 60px 20px;
    }

    /* 页脚 */
    .footer {
      background: var(--primary-deep-olive);
      color: #e3dfd5;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .footer a:hover {
      color: var(--accent-electric-orange);
    }

    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
      }
      .highlights-grid {
        grid-template-columns: repeat(2,1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-chips, .header-cta-btn {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .highlights-grid, .cases-grid, .solutions-compare, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-h1 {
        font-size: 2rem;
      }
    }