/* roulang page: index */
:root {
      --primary-dark: #0A0E27;
      --accent-green: #00F0A8;
      --accent-pink: #FF4D6D;
      --bg-light: #F5F7FA;
      --card-bg: #FFFFFF;
      --text-main: #1A1A2E;
      --text-secondary: #5A5A72;
      --border-light: #E0E4EA;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0,0,0,0.08);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --transition: all 0.3s ease;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--bg-light);
      color: var(--text-main);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, h4 {
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    h1 {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: -0.5px;
      color: var(--primary-dark);
    }
    h2 {
      font-size: 36px;
      font-weight: 700;
      line-height: 1.3;
      color: var(--primary-dark);
    }
    h3 {
      font-size: 22px;
      font-weight: 600;
      line-height: 1.4;
      color: var(--text-main);
    }
    .text-accent {
      color: var(--accent-green);
    }
    .text-pink {
      color: var(--accent-pink);
    }
    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
      z-index: 100;
      padding: 12px 0;
      transition: var(--transition);
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
    }
    .logo {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary-dark);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      color: var(--accent-green);
      font-size: 26px;
    }
    .search-box {
      flex: 1;
      max-width: 400px;
      margin: 0 30px;
      position: relative;
    }
    .search-box input {
      width: 100%;
      background: #F0F2F5;
      border: 1px solid transparent;
      border-radius: var(--radius-btn);
      padding: 12px 20px 12px 48px;
      font-size: 15px;
      outline: none;
      transition: var(--transition);
    }
    .search-box input:focus {
      background: white;
      border-color: var(--accent-green);
      box-shadow: 0 0 0 3px rgba(0,240,168,0.15);
    }
    .search-box i {
      position: absolute;
      left: 20px;
      top: 50%;
      transform: translateY(-50%);
      color: var(--accent-green);
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-weight: 500;
      color: var(--text-main);
      font-size: 16px;
      padding: 8px 0;
      border-bottom: 2px solid transparent;
    }
    .nav-links a:hover {
      color: var(--accent-green);
      border-bottom-color: var(--accent-green);
    }
    .nav-cta {
      background: var(--accent-green);
      color: var(--primary-dark) !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-btn);
      font-weight: 700;
      border: none;
      margin-left: 8px;
    }
    .nav-cta:hover {
      background: #00D996;
      box-shadow: 0 0 18px rgba(0,240,168,0.4);
      color: var(--primary-dark) !important;
    }
    .menu-icon {
      display: none;
      font-size: 26px;
      cursor: pointer;
      color: var(--primary-dark);
    }
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    .section-dark {
      background: var(--primary-dark);
      color: white;
    }
    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: linear-gradient(135deg, #f5f7fa 0%, #eef2f7 100%);
      position: relative;
      overflow: hidden;
    }
    .hero::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 80px;
      background: url('data:image/svg+xml;utf8,<svg viewBox="0 0 1440 80" xmlns="http://www.w3.org/2000/svg"><path d="M0 40 Q 360 0 720 40 T 1440 40 L1440 80 L0 80 Z" fill="%23ffffff"/></svg>') no-repeat bottom center;
      background-size: cover;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 50px;
    }
    .hero-left {
      flex: 1;
    }
    .hero-right {
      flex: 1;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 380px;
      border-radius: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      position: relative;
    }
    .hero-right::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, rgba(10,14,39,0.25) 0%, rgba(0,240,168,0.15) 100%);
      border-radius: 32px;
    }
    .hero h1 {
      margin-bottom: 20px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .btn-group {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--accent-green);
      color: var(--primary-dark);
      font-weight: 700;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      display: inline-block;
      transition: var(--transition);
      border: none;
      cursor: pointer;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: #00D996;
      box-shadow: 0 0 22px rgba(0,240,168,0.5);
      color: var(--primary-dark);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--accent-green);
      color: var(--accent-green);
      font-weight: 700;
      padding: 16px 36px;
      border-radius: var(--radius-btn);
      transition: var(--transition);
    }
    .btn-outline:hover {
      background: var(--accent-green);
      color: var(--primary-dark);
    }
    /* 服务卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
      margin-top: 48px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      align-items: flex-start;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-icon {
      width: 64px;
      height: 64px;
      background: rgba(0,240,168,0.12);
      border-radius: 20px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      color: var(--accent-green);
      font-size: 32px;
      transition: var(--transition);
    }
    .service-card:hover .service-icon {
      background: var(--accent-green);
      color: white;
    }
    .service-card h3 {
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-secondary);
      margin-bottom: 20px;
      font-size: 15px;
    }
    .text-link {
      color: var(--accent-green);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    /* 数据带 */
    .stats-band {
      background: #EEF2F7;
      padding: 60px 0;
    }
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      text-align: center;
      gap: 30px;
    }
    .stat-number {
      font-size: 44px;
      font-weight: 800;
      color: var(--accent-green);
      display: block;
      line-height: 1.2;
      margin-bottom: 10px;
      position: relative;
    }
    .stat-number::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: var(--accent-green);
      margin: 12px auto 0;
      border-radius: 2px;
    }
    .stat-label {
      color: var(--text-secondary);
      font-weight: 500;
    }
    /* 案例卡片 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 48px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .case-img {
      height: 200px;
      background-size: cover;
      background-position: center;
      transition: transform 0.4s ease;
    }
    .case-card:hover .case-img {
      transform: scale(1.03);
    }
    .case-content {
      padding: 24px;
    }
    .badge {
      background: rgba(255,77,109,0.1);
      color: var(--accent-pink);
      font-weight: 600;
      font-size: 13px;
      padding: 4px 12px;
      border-radius: 30px;
      display: inline-block;
      margin-bottom: 12px;
    }
    /* 流程 */
    .steps-row {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      margin-top: 48px;
      position: relative;
    }
    .step-item {
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 56px;
      height: 56px;
      background: var(--accent-green);
      color: var(--primary-dark);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 800;
      margin: 0 auto 20px;
    }
    .step-line {
      position: absolute;
      top: 28px;
      left: 70%;
      width: 60%;
      height: 2px;
      border-top: 2px dashed #ccc;
      z-index: 0;
    }
    .step-item:last-child .step-line {
      display: none;
    }
    /* FAQ */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }
    .accordion-item {
      border-bottom: 1px solid #eee;
    }
    .accordion-title {
      font-weight: 600;
      font-size: 20px;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .accordion-item.active .accordion-content {
      max-height: 200px;
      padding-bottom: 20px;
    }
    /* CTA 横幅 */
    .cta-banner {
      background: var(--primary-dark);
      text-align: center;
      padding: 90px 20px;
    }
    .cta-banner h2 {
      color: white;
    }
    /* 页脚 */
    .site-footer {
      background: #0A0E27;
      color: #AAA;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    .footer-logo {
      font-size: 26px;
      font-weight: 800;
      color: white;
    }
    @media (max-width: 1024px) {
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .case-grid { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      h1 { font-size: 36px; }
      h2 { font-size: 30px; }
      .menu-icon { display: block; }
      .nav-links { display: none; flex-direction: column; width: 100%; background: white; padding: 20px; }
      .nav-links.active { display: flex; }
      .search-box { order: 1; width: 100%; margin: 10px 0; }
      .hero-grid { flex-direction: column; }
      .services-grid, .case-grid, .stats-grid, .footer-grid { grid-template-columns: 1fr; }
      .steps-row { flex-direction: column; gap: 30px; }
      .step-line { display: none; }
    }