/* roulang page: index */
:root {
      --amber: #D4790E;
      --amber-dark: #B5650B;
      --slate: #2C3A4A;
      --slate-deep: #1F2933;
      --bg-warm: #FAF8F5;
      --bg-light: #F2F0ED;
      --teal: #0EA5A0;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-muted: #8A8A8A;
      --border-light: #E5E2DD;
      --white: #FFFFFF;
      --radius-card: 8px;
      --radius-btn: 6px;
      --radius-tag: 4px;
      --shadow-default: 0 2px 12px rgba(44,58,74,0.06);
      --shadow-hover: 0 8px 28px rgba(44,58,74,0.10);
      --font-mono: 'Fira Code', 'Courier New', monospace;
      --transition: all 0.2s ease;
    }

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

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.8;
      font-weight: 400;
      font-size: 16px;
    }

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

    /* 导航栏 */
    .top-bar-custom {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: rgba(250, 248, 245, 0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      z-index: 1000;
      box-shadow: 0 1px 8px rgba(0,0,0,0.02);
      display: flex;
      align-items: center;
      transition: var(--transition);
    }
    .top-bar-custom.scrolled {
      box-shadow: 0 4px 20px rgba(44,58,74,0.08);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--amber);
    }
    .logo-text {
      font-weight: 700;
      font-size: 22px;
      color: var(--slate);
      letter-spacing: 0.5px;
      white-space: nowrap;
    }
    .logo-text span {
      color: var(--amber);
    }

    .nav-links {
      display: flex;
      gap: 28px;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--slate);
      text-decoration: none;
      transition: color 0.2s;
      white-space: nowrap;
    }
    .nav-links a:hover {
      color: var(--amber);
    }

    .menu-icon {
      display: none;
      font-size: 24px;
      color: var(--slate);
      cursor: pointer;
    }

    /* 移动端导航 */
    @media screen and (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--bg-warm);
        flex-direction: column;
        align-items: center;
        gap: 20px;
        padding: 32px 0;
        box-shadow: 0 12px 24px rgba(0,0,0,0.05);
        border-top: 1px solid var(--border-light);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-icon {
        display: block;
      }
    }

    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    @media screen and (max-width: 768px) {
      section {
        padding: 70px 0;
      }
    }

    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--slate);
      margin-bottom: 16px;
      text-align: center;
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 680px;
      margin: 0 auto 48px;
      text-align: center;
    }

    /* Hero */
    #hero {
      padding-top: 120px;
      padding-bottom: 60px;
      background-color: var(--bg-warm);
      min-height: 90vh;
      display: flex;
      align-items: center;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
    }
    .hero-left {
      flex: 1 1 50%;
    }
    .hero-right {
      flex: 1 1 50%;
      position: relative;
      min-height: 380px;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-default);
    }
    .hero-right::after {
      content: "";
      position: absolute;
      inset: 0;
      background: rgba(44,58,74,0.25);
      backdrop-filter: blur(1px);
    }
    .data-overlay {
      position: absolute;
      top: 20px;
      right: 20px;
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(4px);
      padding: 12px 18px;
      border-radius: var(--radius-card);
      font-family: var(--font-mono);
      color: var(--amber);
      font-size: 14px;
      z-index: 2;
      box-shadow: var(--shadow-default);
    }

    .tag {
      display: inline-block;
      background: rgba(212,121,14,0.08);
      color: var(--amber);
      font-weight: 600;
      font-size: 14px;
      padding: 4px 12px;
      border-radius: var(--radius-tag);
      margin-bottom: 20px;
    }

    h1 {
      font-size: 48px;
      font-weight: 700;
      color: var(--slate);
      line-height: 1.3;
      margin-bottom: 20px;
    }
    .hero-desc {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 36px;
    }
    .btn-group {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--amber);
      color: white;
      border: none;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-primary:hover {
      background: var(--amber-dark);
      transform: translateY(-2px);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--slate);
      color: var(--slate);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
    }
    .btn-secondary:hover {
      background: rgba(44,58,74,0.08);
    }

    @media screen and (max-width: 768px) {
      .hero-grid {
        flex-direction: column;
      }
      h1 {
        font-size: 36px;
      }
      .hero-right {
        min-height: 280px;
      }
    }

    /* 特性卡片 */
    .features-grid {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .feature-card {
      flex: 1 1 280px;
      background: var(--white);
      padding: 32px;
      border-radius: var(--radius-card);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-default);
      transition: var(--transition);
    }
    .feature-card:hover {
      border-color: var(--amber);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 32px;
      color: var(--amber);
      margin-bottom: 16px;
    }
    .feature-card h3 {
      font-size: 20px;
      font-weight: 600;
      color: var(--slate);
    }

    /* 服务左右交替 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text {
      flex: 1;
    }
    .service-img {
      flex: 1;
      background-size: cover;
      background-position: center;
      border-radius: var(--radius-card);
      min-height: 300px;
      box-shadow: var(--shadow-default);
    }
    @media screen and (max-width: 768px) {
      .service-row, .service-row.reverse {
        flex-direction: column;
      }
    }

    /* 流程 */
    .process-steps {
      display: flex;
      justify-content: center;
      gap: 40px;
      flex-wrap: wrap;
    }
    .step-item {
      text-align: center;
    }
    .step-circle {
      width: 64px;
      height: 64px;
      border-radius: 50%;
      background: var(--white);
      border: 2px solid var(--border-light);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      color: var(--amber);
      margin: 0 auto 12px;
    }

    /* 案例卡片 */
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 24px;
      border-left: 4px solid var(--amber);
      box-shadow: var(--shadow-default);
    }

    /* FAQ */
    .accordion-custom .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      color: var(--slate);
      padding: 18px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }

    /* CTA */
    .cta-section {
      background: linear-gradient(180deg, #FAF8F5 0%, #F2F0ED 100%);
    }

    /* 页脚 */
    .footer {
      background: var(--slate);
      color: #C5C2BD;
      padding: 60px 0 20px;
    }
    .footer a {
      color: #C5C2BD;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--amber);
    }
    .copyright {
      background: var(--slate-deep);
      color: #9CA3AF;
      text-align: center;
      padding: 20px 0;
    }