/* roulang page: index */
:root {
      --primary: #1A472A;
      --primary-soft: rgba(26, 71, 42, 0.08);
      --accent: #F5A623;
      --accent-hover: #E09515;
      --dark: #2C2C2C;
      --body-bg: #FAFAF7;
      --card-bg: #FFFFFF;
      --border-light: #E5E8E3;
      --text-primary: #2C2C2C;
      --text-secondary: #4A4A4A;
      --text-muted: #6B6B6B;
      --white: #FFFFFF;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 6px;
      --shadow-card: 0 4px 20px rgba(26, 71, 42, 0.08);
      --shadow-hover: 0 8px 30px rgba(26, 71, 42, 0.15);
      --transition: 0.2s ease;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "WenQuanYi Micro Hei", "Inter", sans-serif;
      --container-max: 1280px;
      --header-height: 72px;
    }

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

    body {
      font-family: var(--font-sans);
      background-color: var(--body-bg);
      color: var(--text-secondary);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }

    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }

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

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

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

    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: var(--header-height);
      background: var(--white);
      box-shadow: 0 2px 8px 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 {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: -0.3px;
    }

    .logo-icon {
      width: 26px;
      height: 26px;
      background: var(--accent);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .logo-icon::before {
      content: "";
      width: 10px;
      height: 10px;
      background: var(--white);
      border-radius: 50%;
      position: absolute;
      box-shadow: 0 0 0 2px var(--dark);
    }

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

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

    .nav-links a::after {
      content: "";
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: width var(--transition);
    }

    .nav-links a:hover {
      color: var(--accent);
    }

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

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 8px;
    }

    .hamburger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: 0.2s;
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: var(--header-height);
      left: 0;
      width: 100%;
      height: calc(100vh - var(--header-height));
      background: var(--body-bg);
      flex-direction: column;
      padding: 32px;
      gap: 28px;
      z-index: 999;
      align-items: center;
      justify-content: center;
    }

    .mobile-menu a {
      font-size: 20px;
      font-weight: 600;
      color: var(--primary);
    }

    /* Hero */
    #hero {
      padding-top: var(--header-height);
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: radial-gradient(circle at 20% 30%, rgba(26,71,42,0.02) 0%, var(--body-bg) 70%);
    }

    .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;
      color: var(--primary);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-content .subtitle {
      font-size: 18px;
      line-height: 1.6;
      color: var(--text-secondary);
      margin-bottom: 32px;
      max-width: 480px;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .btn-primary {
      background: var(--accent);
      color: var(--white);
      border: none;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-block;
      text-align: center;
      box-shadow: 0 4px 10px rgba(245,166,35,0.3);
    }

    .btn-primary:hover {
      background: var(--accent-hover);
      transform: scale(1.03);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }

    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }

    .hero-visual {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 32px;
      height: 420px;
      position: relative;
      overflow: hidden;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
    }

    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(26,71,42,0.4) 0%, rgba(245,166,35,0.2) 100%);
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }

    .section-title {
      font-size: 36px;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 16px;
      text-align: center;
      letter-spacing: -0.3px;
    }

    .section-desc {
      text-align: center;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto 48px;
      font-size: 17px;
    }

    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: box-shadow var(--transition), transform var(--transition);
      border: 1px solid var(--border-light);
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .service-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-5px);
    }

    .card-icon {
      width: 64px;
      height: 64px;
      background: rgba(26,71,42,0.06);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 30px;
    }

    .service-card h3 {
      font-size: 22px;
      font-weight: 600;
      color: var(--primary);
    }

    .service-card p {
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
    }

    .card-accent {
      height: 4px;
      background: var(--accent);
      width: 40px;
      border-radius: 4px;
      margin-top: auto;
    }

    /* 数据优势 */
    #advantages {
      background: var(--primary);
      color: var(--white);
    }

    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      text-align: center;
    }

    .stat-item .number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }

    .stat-item .label {
      font-size: 16px;
      opacity: 0.9;
      margin-top: 8px;
    }

    /* 案例网格 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
      border: 1px solid var(--border-light);
    }

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

    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img {
      transform: scale(1.05);
    }

    .case-info {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .case-info h4 {
      font-weight: 600;
      color: var(--primary);
    }

    .tag {
      background: var(--accent);
      color: var(--white);
      font-size: 13px;
      font-weight: 500;
      padding: 4px 12px;
      border-radius: 20px;
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      gap: 24px;
    }

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

    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--accent);
      color: var(--white);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin: 0 auto 16px;
    }

    .step h4 {
      color: var(--dark);
      font-weight: 600;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      color: var(--dark);
      background: none;
      border: none;
      width: 100%;
      text-align: left;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      font-size: 15px;
      line-height: 1.7;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-toggle {
      font-size: 22px;
      transition: transform 0.2s;
    }

    .faq-item.active .faq-toggle {
      transform: rotate(45deg);
    }

    /* 联系 */
    #contact-footer {
      background: var(--dark);
      color: var(--white);
      padding: 80px 0 30px;
    }

    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      margin-bottom: 48px;
    }

    .contact-form input, .contact-form textarea {
      width: 100%;
      padding: 14px 16px;
      margin-bottom: 16px;
      background: #3A3A3A;
      border: none;
      border-radius: 6px;
      color: white;
      font-size: 15px;
    }

    .contact-form input:focus, .contact-form textarea:focus {
      outline: 2px solid var(--accent);
    }

    .footer-bottom {
      border-top: 1px solid #444;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #9B9B9B;
    }

    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .cards-grid, .cases-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .cards-grid, .cases-grid { grid-template-columns: 1fr; }
      .process-steps { flex-direction: column; align-items: center; }
      .contact-grid { grid-template-columns: 1fr; }
      .hero-content h1 { font-size: 32px; }
      section { padding: 70px 0; }
    }