/* roulang page: index */
:root {
      --gold: #C8A96E;
      --dark-rock: #2B2B2B;
      --warm-white: #FAF7F2;
      --deep-green: #1E3A32;
      --light-gray: #F0EDE6;
      --mid-gray: #6B6B6B;
      --dark-gray: #3A3A3A;
      --border-light: #e0dcd5;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-input: 4px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --max-width: 1280px;
      --section-space: 100px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--warm-white);
      color: var(--mid-gray);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

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

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

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航双行结构 */
    .brand-row {
      background-color: var(--warm-white);
      height: 56px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 20px;
      border-bottom: 1px solid var(--border-light);
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--dark-rock);
      letter-spacing: 1px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background-color: var(--gold);
      border-radius: 6px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: bold;
      font-size: 20px;
    }

    .brand-actions {
      display: flex;
      align-items: center;
      gap: 24px;
      color: var(--dark-gray);
    }
    .phone-link {
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 500;
      color: var(--dark-rock);
    }
    .search-icon {
      cursor: pointer;
      font-size: 18px;
    }

    .channel-row {
      background-color: var(--dark-rock);
      height: 44px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 32px;
      padding: 0 20px;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    }
    .channel-row a {
      color: white;
      font-weight: 500;
      font-size: 15px;
      padding: 4px 0;
      border-bottom: 3px solid transparent;
      transition: border-color 0.2s, color 0.2s;
    }
    .channel-row a:hover,
    .channel-row a.active {
      color: var(--gold);
      border-bottom-color: var(--gold);
    }

    .hamburger {
      display: none;
      background: none;
      border: none;
      color: white;
      font-size: 24px;
      cursor: pointer;
    }

    /* Hero */
    .hero {
      height: 100vh;
      min-height: 600px;
      background: linear-gradient(90deg, rgba(43,43,43,0.75) 0%, rgba(43,43,43,0.2) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      display: flex;
      align-items: center;
      color: white;
      position: relative;
    }
    .hero-content {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      flex-wrap: wrap;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 500px;
    }
    .hero h1 {
      font-size: 48px;
      line-height: 1.25;
      font-weight: 700;
      color: white;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: rgba(255,255,255,0.85);
      margin-bottom: 32px;
      max-width: 550px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background-color: var(--deep-green);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      border: none;
      cursor: pointer;
      transition: background 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: #152B25;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--gold);
      color: var(--gold);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: background 0.2s, color 0.2s;
    }
    .btn-outline:hover {
      background: rgba(200,169,110,0.1);
      color: #fff;
    }
    .data-cards {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .data-item {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(8px);
      padding: 20px 24px;
      border-radius: 12px;
      color: white;
      text-align: center;
      min-width: 140px;
    }
    .data-number {
      font-family: var(--font-number);
      font-size: 38px;
      font-weight: 700;
    }
    .data-label {
      font-size: 14px;
      opacity: 0.9;
    }

    /* 通用区块 */
    section {
      padding: var(--section-space) 0;
    }
    .section-title {
      text-align: center;
      font-size: 36px;
      font-weight: 600;
      color: var(--dark-rock);
      margin-bottom: 16px;
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 3px;
      background: var(--deep-green);
      margin: 12px auto 0;
    }
    .section-sub {
      text-align: center;
      color: var(--mid-gray);
      margin-bottom: 48px;
    }

    /* 关于 */
    .about-grid {
      display: flex;
      align-items: center;
      gap: 60px;
      flex-wrap: wrap;
    }
    .about-text {
      flex: 1;
    }
    .about-text p {
      margin: 16px 0;
      font-size: 17px;
    }
    .tags {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      margin-top: 24px;
    }
    .tag {
      background: var(--light-gray);
      padding: 6px 18px;
      border-radius: 20px;
      color: var(--dark-rock);
      font-weight: 500;
      font-size: 14px;
    }
    .about-image img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 32px 24px;
    }
    .service-card {
      background: white;
      padding: 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s;
      text-align: center;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .icon-circle {
      width: 64px;
      height: 64px;
      background: var(--deep-green);
      border-radius: 50%;
      margin: 0 auto 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 28px;
    }
    .service-card h3 {
      font-size: 20px;
      color: var(--dark-rock);
      margin-bottom: 12px;
    }

    /* 优势数据 */
    .stats-block {
      background-color: var(--light-gray);
      padding: 60px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 24px;
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 56px;
      font-weight: 700;
      color: var(--deep-green);
      line-height: 1.1;
    }
    .stat-label {
      color: var(--mid-gray);
      font-weight: 500;
      margin-top: 8px;
    }

    /* 案例 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 32px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s ease;
    }
    .case-card:hover {
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      overflow: hidden;
      height: 200px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.25s ease;
    }
    .case-card:hover .case-img img {
      transform: scale(1.03);
    }
    .case-info {
      padding: 20px;
    }
    .case-tag {
      background: var(--gold);
      color: white;
      font-size: 12px;
      padding: 2px 10px;
      border-radius: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }

    /* 解决方案 */
    .solution-row {
      display: flex;
      align-items: center;
      gap: 50px;
      margin-bottom: 80px;
      flex-wrap: wrap;
    }
    .solution-row.reverse {
      flex-direction: row-reverse;
    }
    .solution-img, .solution-text {
      flex: 1 1 300px;
    }
    .solution-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    .solution-text h3 {
      font-size: 28px;
      color: var(--dark-rock);
      margin-bottom: 16px;
    }
    .solution-list {
      list-style: none;
      margin: 20px 0;
    }
    .solution-list li::before {
      content: "■";
      color: var(--deep-green);
      margin-right: 10px;
    }

    /* FAQ */
    .faq-container {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      border: 1px solid var(--border-light);
      border-radius: 6px;
      margin-bottom: 12px;
      background: white;
    }
    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--dark-rock);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: var(--warm-white);
    }
    .faq-answer {
      padding: 0 24px 18px;
      color: var(--mid-gray);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    .faq-item.open .faq-question {
      background: white;
    }

    /* CTA */
    .cta-section {
      background: var(--deep-green);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      max-width: 700px;
      margin: 32px auto 0;
      flex-wrap: wrap;
      justify-content: center;
    }
    .cta-form input {
      flex: 1 1 180px;
      padding: 12px 16px;
      border-radius: var(--radius-input);
      border: 1px solid #ccc;
      background: white;
    }
    .cta-form button {
      background: var(--gold);
      color: var(--dark-rock);
      font-weight: bold;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      cursor: pointer;
    }

    /* 页脚 */
    .footer {
      background: var(--dark-rock);
      color: #C0C0C0;
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: repeat(4,1fr);
      gap: 32px;
    }
    .footer a {
      color: #C0C0C0;
    }
    .footer a:hover {
      color: var(--gold);
    }
    .copyright {
      margin-top: 40px;
      padding-top: 20px;
      border-top: 1px solid #444;
      text-align: center;
      color: #888;
      font-size: 14px;
    }

    @media (max-width: 768px) {
      .channel-row {
        justify-content: space-between;
      }
      .channel-links {
        display: none;
        flex-direction: column;
        background: var(--dark-rock);
        position: absolute;
        top: 44px;
        left: 0;
        width: 100%;
        padding: 16px;
      }
      .channel-links.open {
        display: flex;
      }
      .hamburger {
        display: block;
      }
      .hero h1 {
        font-size: 32px;
      }
      .stats-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2,1fr);
      }
      .solution-row {
        flex-direction: column;
      }
      .solution-row.reverse {
        flex-direction: column;
      }
    }

    @media (max-width: 480px) {
      .btn-group {
        flex-direction: column;
      }
    }