/* roulang page: index */
:root {
      --primary: #1B2A4A;
      --accent: #D4A843;
      --bg: #F7F9FC;
      --card-bg: #FFFFFF;
      --dark-bg: #0F1A2E;
      --text: #2D3748;
      --text-secondary: #718096;
      --border: #E2E8F0;
      --success: #38A169;
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-nav: 24px;
      --shadow-card: 0 2px 12px rgba(27,42,74,0.06);
      --shadow-card-hover: 0 8px 24px rgba(27,42,74,0.12);
      --shadow-nav: 0 4px 20px rgba(27,42,74,0.08);
      --transition: 0.25s ease;
      --font: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
    }
    
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: var(--font);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    a { text-decoration: none; color: inherit; }
    img { max-width: 100%; height: auto; display: block; }
    button, input { font-family: inherit; }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding-left: 20px;
      padding-right: 20px;
    }
    /* 板块间距 */
    section { padding: 80px 0; }
    @media (max-width: 640px) {
      section { padding: 48px 0; }
    }
    
    /* 标题装饰线 */
    .section-title {
      font-size: 2.2rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 32px;
      position: relative;
      display: inline-block;
    }
    .section-title::after {
      content: '';
      position: absolute;
      left: 0;
      bottom: -8px;
      width: 40px;
      height: 3px;
      border-radius: 2px;
      background-color: var(--accent);
    }
    @media (max-width: 640px) {
      .section-title { font-size: 1.6rem; }
    }

    /* 浮动导航 Dock */
    .nav-dock {
      position: fixed;
      top: 16px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 32px);
      max-width: 1100px;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      border-radius: var(--radius-nav);
      box-shadow: var(--shadow-nav);
      padding: 12px 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      transition: var(--transition);
    }
    .logo {
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--accent);
    }
    .nav-links {
      display: flex;
      gap: 28px;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      color: #4A5568;
      font-weight: 500;
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a:hover { color: var(--accent); }
    .nav-links a.active {
      color: var(--primary);
      border-bottom: 2px solid var(--accent);
      padding-bottom: 4px;
    }
    .nav-cta {
      background: var(--accent);
      color: #fff;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 0.95rem;
      transition: background var(--transition), box-shadow var(--transition);
      white-space: nowrap;
    }
    .nav-cta:hover { background: #B8912F; box-shadow: 0 6px 18px rgba(212,168,67,0.4); color: #fff; }
    .burger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }
    .burger span {
      width: 24px;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
      transition: var(--transition);
    }
    .burger span.short { width: 16px; align-self: flex-end; }
    
    /* 移动端菜单 */
    .mobile-menu {
      position: fixed;
      top: 0; left: 0; width: 100%; height: 100%;
      background: var(--bg);
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 24px;
      transform: translateY(-100%);
      transition: transform 0.35s ease;
    }
    .mobile-menu.open { transform: translateY(0); }
    .mobile-menu a {
      font-size: 1.25rem;
      font-weight: 500;
      color: var(--primary);
    }
    .mobile-close {
      position: absolute;
      top: 24px; right: 24px;
      font-size: 1.8rem;
      background: none;
      border: none;
      color: var(--primary);
    }
    
    @media (max-width: 640px) {
      .nav-links, .nav-cta.desktop-cta { display: none; }
      .burger { display: flex; }
      .nav-dock { padding: 12px 20px; }
    }
    
    /* Hero */
    .hero {
      padding-top: 120px;
      padding-bottom: 80px;
      background-color: var(--bg);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 10%; right: 5%;
      width: 320px; height: 320px;
      border: 2px solid rgba(212,168,67,0.08);
      border-radius: 50%;
      pointer-events: none;
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 8fr 4fr;
      gap: 40px;
      align-items: center;
    }
    .hero h1 {
      font-size: 3.2rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.02em;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    .hero h1 .highlight { color: var(--accent); }
    .hero .subtitle {
      font-size: 1.15rem;
      color: var(--text-secondary);
      max-width: 480px;
      margin-bottom: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent);
      color: #fff;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      letter-spacing: 0.03em;
      box-shadow: 0 4px 14px rgba(212,168,67,0.3);
      transition: background var(--transition), box-shadow var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover { background: #B8912F; box-shadow: 0 6px 18px rgba(212,168,67,0.4); color:#fff; }
    .btn-secondary {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 1rem;
      transition: all var(--transition);
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover { background: var(--primary); color: #fff; }
    .hero-image img {
      border-radius: 16px;
      box-shadow: 0 8px 30px rgba(27,42,74,0.1);
      width: 100%;
    }
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-image { order: -1; max-width: 500px; margin: 0 auto; }
      .hero h1 { font-size: 2.4rem; }
    }
    @media (max-width: 640px) {
      .hero h1 { font-size: 2rem; }
      .hero { padding-top: 100px; }
    }
    
    /* 卡片通用 */
    .card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px;
      transition: all var(--transition);
      height: 100%;
    }
    .card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
    
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-icon {
      width: 64px; height: 64px;
      background: #F0F4FA;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 20px;
      transition: background var(--transition);
    }
    .card:hover .service-icon { background: rgba(212,168,67,0.1); }
    .service-icon img { width: 36px; height: 36px; object-fit: contain; }
    .card h3 { font-size: 1.25rem; font-weight: 600; color: var(--primary); margin-bottom: 10px; }
    .card p { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 12px; }
    .text-link { color: var(--accent); font-weight: 500; transition: opacity var(--transition); }
    .text-link:hover { text-decoration: underline; opacity: 0.8; }
    
    @media (max-width: 1024px) { .services-grid { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 640px) { .services-grid { grid-template-columns: 1fr; } }
    
    /* 优势数据 */
    .stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
      margin-bottom: 48px;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
    }
    .stat-label { font-size: 0.9rem; color: var(--text-secondary); }
    .advantage-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }
    .advantage-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
    }
    .advantage-item i {
      color: var(--accent);
      font-size: 1.4rem;
      margin-top: 4px;
    }
    @media (max-width: 640px) {
      .stats-row { grid-template-columns: repeat(2,1fr); }
      .advantage-grid { grid-template-columns: 1fr; }
    }
    
    /* 案例卡片 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      overflow: hidden;
      transition: var(--transition);
    }
    .case-card:hover { box-shadow: var(--shadow-card-hover); transform: translateY(-2px); }
    .case-img { aspect-ratio: 16/9; overflow: hidden; }
    .case-img img { width: 100%; height: 100%; object-fit: cover; }
    .case-content { padding: 20px; }
    .tag {
      background: #F0F4FA;
      color: #4A5568;
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 0.75rem;
      display: inline-block;
      margin-right: 8px;
      margin-bottom: 8px;
    }
    .case-highlight { font-weight: 700; color: var(--success); margin-top: 8px; }
    @media (max-width: 1024px) { .cases-grid { grid-template-columns: repeat(2,1fr); } }
    @media (max-width: 640px) { .cases-grid { grid-template-columns: 1fr; } }
    
    /* 流程时间轴 */
    .process-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }
    .process-steps::before {
      content: '';
      position: absolute;
      top: 20px; left: 10%; right: 10%;
      height: 2px;
      background: var(--border);
      z-index: 0;
    }
    .step {
      text-align: center;
      flex: 1;
      position: relative;
      z-index: 1;
    }
    .step-circle {
      width: 40px; height: 40px;
      background: var(--accent);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 12px;
    }
    @media (max-width: 640px) {
      .process-steps { flex-direction: column; gap: 24px; }
      .process-steps::before { display: none; }
    }
    
    /* FAQ */
    .accordion-item {
      background: #fff;
      border-bottom: 1px solid var(--border);
      margin-bottom: 4px;
      border-radius: 4px;
      overflow: hidden;
    }
    .accordion-title {
      padding: 18px 20px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transition: background var(--transition);
    }
    .accordion-title:hover { background: #F7F9FC; }
    .accordion-content {
      padding: 0 20px 16px;
      display: none;
      background: #FAFBFD;
      color: var(--text-secondary);
    }
    .accordion-item.active .accordion-content { display: block; }
    
    /* CTA 尾板 */
    .cta-dark {
      background: var(--dark-bg);
      padding: 64px 0;
      text-align: center;
      color: #fff;
    }
    .cta-dark h2 { color: #fff; margin-bottom: 12px; }
    .cta-dark p { color: #A0AEC0; max-width: 500px; margin: 0 auto 24px; }
    .cta-dark .btn-primary { padding: 16px 40px; font-size: 1.1rem; }
    
    /* 页脚 */
    .footer {
      background: var(--dark-bg);
      color: #A0AEC0;
      padding: 48px 0 24px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer a { color: #CBD5E0; transition: color var(--transition); }
    .footer a:hover { color: var(--accent); }
    .footer-bottom {
      border-top: 1px solid #2D3748;
      padding-top: 20px;
      text-align: center;
      font-size: 0.9rem;
    }
    @media (max-width: 768px) {
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 640px) {
      .footer-grid { grid-template-columns: 1fr; }
    }
    
    button:focus-visible, a:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }