/* roulang page: index */
:root {
      --primary: #0F3B5E;
      --primary-deep: #1A2D3D;
      --accent: #E85D2C;
      --accent-hover: #C94A1E;
      --bg-warm: #F5F2ED;
      --bg-light: #EAE6DF;
      --card-bg: #FFFFFF;
      --text-main: #3A3A3A;
      --text-muted: #6B6B6B;
      --text-light: #8C8C8C;
      --border: #D9D3CA;
      --success: #2A9D8F;
      --white: #FFFFFF;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-md: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 24px;
      --radius-btn: 50px;
      --radius-sm: 12px;
      --transition: 0.3s ease;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    }
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      font-family: var(--font-stack);
      background-color: var(--bg-warm);
      color: var(--text-main);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(255,255,255,0);
      transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
      padding: 0 0;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
      border-bottom: 1px solid var(--border);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo {
      font-weight: 700;
      font-size: 20px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
      letter-spacing: -0.02em;
      transition: color 0.3s;
    }
    .scrolled .logo {
      color: var(--primary);
    }
    .logo-icon {
      width: 28px;
      height: 28px;
      background: var(--accent);
      clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
      display: inline-block;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-link {
      font-size: 16px;
      font-weight: 500;
      color: var(--white);
      opacity: 0.9;
      position: relative;
      transition: color 0.2s;
    }
    .scrolled .nav-link {
      color: var(--text-main);
      opacity: 1;
    }
    .nav-link:hover {
      color: var(--accent);
      opacity: 1;
    }
    .nav-link.active::after {
      content: '';
      position: absolute;
      bottom: -6px;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--accent);
      color: var(--white);
      border: none;
      padding: 10px 24px;
      border-radius: 8px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background 0.25s, transform 0.2s, box-shadow 0.2s;
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(232,93,44,0.4);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--white);
      font-size: 28px;
      cursor: pointer;
    }
    .scrolled .menu-toggle {
      color: var(--primary);
    }
    @media (max-width: 768px) {
      .nav-menu {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .header-inner {
        height: 60px;
      }
    }
    /* Hero */
    .hero {
      background: linear-gradient(135deg, #0F3B5E 0%, #1A5276 100%);
      min-height: 90vh;
      display: flex;
      align-items: center;
      padding-top: 80px;
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      right: 0;
      top: 0;
      width: 50%;
      height: 100%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      opacity: 0.2;
      mask-image: linear-gradient(to left, rgba(0,0,0,0.4), transparent);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 40px;
    }
    .hero-text {
      flex: 1 1 50%;
      color: var(--white);
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 700;
      line-height: 1.2;
      letter-spacing: -0.02em;
      margin-bottom: 1.25rem;
      text-shadow: 0 2px 8px rgba(0,0,0,0.3);
    }
    .hero-sub {
      font-size: 1.125rem;
      opacity: 0.85;
      max-width: 480px;
      margin-bottom: 2rem;
    }
    .hero-buttons {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 2rem;
    }
    .btn-hero-primary {
      background: var(--accent);
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 700;
      border: none;
      cursor: pointer;
      transition: 0.25s;
    }
    .btn-hero-primary:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(232,93,44,0.5);
    }
    .btn-hero-outline {
      background: transparent;
      border: 1px solid rgba(255,255,255,0.5);
      color: white;
      padding: 14px 32px;
      border-radius: 50px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-hero-outline:hover {
      background: rgba(255,255,255,0.1);
      border-color: white;
    }
    .trust-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .badge {
      background: rgba(255,255,255,0.1);
      backdrop-filter: blur(8px);
      padding: 6px 18px;
      border-radius: 20px;
      font-size: 0.8rem;
      color: white;
    }
    .hero-visual {
      flex: 1 1 45%;
      display: flex;
      justify-content: center;
    }
    @media (max-width: 768px) {
      .hero-content {
        flex-direction: column;
        text-align: center;
      }
      .hero h1 {
        font-size: 2rem;
      }
      .hero-sub {
        max-width: 100%;
      }
      .hero-visual {
        height: 250px;
        width: 100%;
      }
    }
    /* 通用板块 */
    section {
      padding: 5rem 0;
    }
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      text-align: center;
      margin-bottom: 0.5rem;
      color: var(--primary);
      position: relative;
    }
    .section-title::after {
      content: '';
      display: block;
      width: 50px;
      height: 3px;
      background: var(--accent);
      margin: 0.75rem auto 0;
      border-radius: 2px;
    }
    .section-sub {
      text-align: center;
      color: var(--text-muted);
      max-width: 640px;
      margin: 0 auto 2.5rem;
    }
    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 2rem;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-md);
    }
    .card-icon {
      width: 56px;
      height: 56px;
      background: rgba(15,59,94,0.08);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 1.25rem;
      color: var(--accent);
    }
    .service-card h3 {
      font-size: 1.375rem;
      margin-bottom: 0.75rem;
    }
    .service-card p {
      color: var(--text-muted);
      margin-bottom: 1rem;
    }
    .feature-list {
      list-style: none;
      margin: 1rem 0;
    }
    .feature-list li::before {
      content: "●";
      color: var(--accent);
      margin-right: 8px;
    }
    .text-link {
      color: var(--accent);
      font-weight: 600;
      margin-top: auto;
    }
    @media (max-width: 768px) {
      .cards-grid {
        grid-template-columns: 1fr;
      }
    }
    /* 数据墙 */
    .data-wall {
      background: var(--bg-light);
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 24px;
    }
    .stat-card {
      background: white;
      padding: 2rem 1rem;
      border-radius: 16px;
      text-align: center;
    }
    .stat-number {
      font-size: 2.5rem;
      font-weight: 800;
      color: var(--primary);
    }
    .stat-label {
      color: var(--text-muted);
    }
    @media (max-width: 576px) {
      .stats-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    /* 案例滚动 */
    .case-scroll {
      display: flex;
      overflow-x: auto;
      gap: 24px;
      padding-bottom: 1rem;
    }
    .case-card {
      flex: 0 0 300px;
      background: white;
      border-radius: 20px;
      border: 1px solid var(--border);
      overflow: hidden;
      transition: 0.2s;
    }
    .case-card:hover {
      border-color: var(--primary);
    }
    .case-img {
      height: 140px;
      background: #ddd url('/assets/images/coverpic/cover-2.webp') center/cover;
    }
    .case-info {
      padding: 1rem;
    }
    /* 流程 */
    .steps {
      display: flex;
      justify-content: space-between;
      text-align: center;
      gap: 24px;
    }
    .step {
      flex: 1;
    }
    .step-num {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 1rem;
      font-weight: 700;
    }
    @media (max-width: 768px) {
      .steps {
        flex-direction: column;
        align-items: center;
      }
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .faq-item {
      background: white;
      border-radius: 12px;
      padding: 0;
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
      background: none;
      border: none;
      width: 100%;
      text-align: left;
      font-size: 1rem;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      padding: 0 24px;
      color: var(--text-muted);
    }
    .faq-item.open .faq-answer {
      max-height: 200px;
      padding-bottom: 20px;
    }
    @media (max-width: 768px) {
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    /* CTA 横幅 */
    .cta-band {
      background: var(--primary);
      position: relative;
      overflow: hidden;
    }
    .cta-band::before {
      content: '';
      position: absolute;
      left: -20%;
      bottom: -40%;
      width: 60%;
      height: 140%;
      background: radial-gradient(circle, rgba(232,93,44,0.25) 0%, transparent 70%);
    }
    .cta-content {
      position: relative;
      text-align: center;
      color: white;
    }
    /* 页脚 */
    .footer {
      background: var(--primary-deep);
      color: #B0BEC5;
      padding: 3rem 0 1rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 2rem;
    }
    .footer a:hover {
      color: var(--accent);
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 2rem;
      padding-top: 1rem;
      text-align: center;
      font-size: 0.8rem;
    }