/* roulang page: index */
:root {
      --primary: #5B8C5A;
      --primary-deep: #3D6B3B;
      --accent: #C49A6C;
      --bg-warm: #FAF7F2;
      --text-dark: #2E2E2E;
      --text-mid: #6B6B6B;
      --card-bg: #FFFFFF;
      --highlight: #D4A24E;
      --border-light: #E0DCD3;
      --tag-bg: #E8EFE6;
      --hover-light: #EDF5EC;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-chip: 20px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

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

    /* 导航栏 */
    .nav-container {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(250, 247, 242, 0.92);
      backdrop-filter: blur(8px);
      -webkit-backdrop-filter: blur(8px);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 12px 0;
    }

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

    .logo {
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
      white-space: nowrap;
    }

    .logo i {
      font-size: 24px;
      color: var(--accent);
    }

    .nav-chips {
      display: flex;
      flex-wrap: nowrap;
      gap: 8px;
      overflow-x: auto;
      -webkit-overflow-scrolling: touch;
      scrollbar-width: none;
      -ms-overflow-style: none;
      padding: 4px 0;
    }

    .nav-chips::-webkit-scrollbar {
      display: none;
    }

    .chip {
      display: inline-block;
      padding: 8px 20px;
      border-radius: var(--radius-chip);
      background: var(--tag-bg);
      color: var(--primary);
      font-weight: 500;
      font-size: 15px;
      transition: all 0.25s;
      white-space: nowrap;
      border: 1px solid transparent;
    }

    .chip:hover, .chip.active {
      background: var(--primary-deep);
      color: white;
      border-color: var(--primary-deep);
    }

    .nav-cta {
      margin-left: 32px;
      background: var(--primary-deep);
      color: white;
      padding: 10px 26px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: all 0.25s;
      white-space: nowrap;
      display: inline-block;
    }

    .nav-cta:hover {
      background: #2E562E;
      transform: translateY(-2px);
      color: white;
    }

    /* Hero */
    #hero {
      background: linear-gradient(135deg, rgba(35,35,35,0.7) 0%, rgba(18,18,18,0.45) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 85vh;
      display: flex;
      align-items: center;
      color: white;
      margin-top: 70px;
      padding: 80px 0;
    }

    .hero-content {
      max-width: 700px;
    }

    .hero-content h1 {
      font-size: 52px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
    }

    .hero-sub {
      font-size: 18px;
      opacity: 0.9;
      margin-bottom: 32px;
      line-height: 1.6;
    }

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

    .btn-outline-light {
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
    }

    .btn-outline-light:hover {
      background: white;
      color: var(--text-dark);
    }

    .btn-accent {
      background: var(--highlight);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: 0.25s;
      border: none;
    }

    .btn-accent:hover {
      background: #b88932;
      transform: translateY(-2px);
      color: white;
    }

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

    .section-title {
      text-align: center;
      margin-bottom: 56px;
    }

    .section-title h2 {
      font-size: 34px;
      font-weight: 600;
      color: var(--text-dark);
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.3s;
    }

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

    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--tag-bg);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      color: var(--primary);
      font-size: 28px;
      transition: 0.3s;
    }

    .card:hover .icon-circle {
      background: #F2E4D6;
      color: var(--accent);
    }

    .card h3 {
      font-size: 22px;
      font-weight: 600;
      margin-bottom: 12px;
    }

    .card p {
      color: var(--text-mid);
      font-size: 15px;
    }

    .text-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 16px;
      display: inline-block;
    }

    /* 优势数据 */
    #advantages {
      background: #F2F7F0;
    }

    .stat-item {
      text-align: center;
    }

    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--highlight);
    }

    .stat-label {
      font-weight: 600;
      margin-top: 8px;
    }

    /* 案例卡片 */
    .case-row {
      display: flex;
      gap: 24px;
      align-items: center;
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 20px;
      box-shadow: var(--shadow-card);
      margin-bottom: 24px;
      transition: 0.3s;
    }

    .case-row:hover {
      box-shadow: var(--shadow-hover);
    }

    .case-img {
      width: 180px;
      height: 120px;
      border-radius: 8px;
      object-fit: cover;
      flex-shrink: 0;
    }

    .case-info h3 {
      font-size: 20px;
      font-weight: 600;
    }

    .tag {
      background: var(--tag-bg);
      color: var(--primary);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      display: inline-block;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      position: relative;
    }

    .step {
      flex: 1;
    }

    .step-circle {
      width: 56px;
      height: 56px;
      border: 2px solid var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 24px;
      margin: 0 auto 12px;
      color: var(--primary);
      background: white;
    }

    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }

    .accordion-question {
      font-weight: 600;
      font-size: 18px;
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }

    .accordion-answer {
      padding: 0 0 18px 16px;
      color: var(--text-mid);
      border-left: 3px solid var(--primary);
      background: #FAF7F2;
      display: none;
    }

    .open .accordion-answer {
      display: block;
    }

    /* CTA 横幅 */
    #cta {
      background: var(--primary-deep);
      color: white;
      text-align: center;
    }

    /* 联系表单 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }

    input, textarea {
      width: 100%;
      padding: 14px;
      border: 1px solid #D3D3D3;
      border-radius: 6px;
      margin-bottom: 16px;
    }

    .btn-primary {
      background: var(--primary-deep);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
    }

    /* 页脚 */
    #footer {
      background: #2E2E2E;
      color: #B0B0B0;
      padding: 48px 0 20px;
    }

    @media (max-width: 1024px) {
      .grid-3 { grid-template-columns: repeat(2,1fr); }
      .grid-4 { grid-template-columns: repeat(2,1fr); }
      .hero-content h1 { font-size: 40px; }
      .process-steps { flex-wrap: wrap; }
    }

    @media (max-width: 640px) {
      .grid-3, .grid-4, .contact-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 32px; }
      .nav-chips { width: 100%; order: 3; margin-top: 8px; }
      .nav-cta { margin-left: 0; }
      .case-row { flex-direction: column; }
      .case-img { width: 100%; height: auto; }
    }