/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #E83A5F;
      --primary-hover: #C92E4F;
      --primary-soft: rgba(232, 58, 95, 0.08);
      --secondary-dark: #1E1E2E;
      --secondary-gold: #FFB347;
      --bg-warm: #FAF9F7;
      --bg-white: #FFFFFF;
      --text-main: #1E1E2E;
      --text-soft: #5A5A6E;
      --border-light: #EBE7E2;
      --shadow-sm: 0 2px 12px rgba(30, 30, 46, 0.06);
      --shadow-md: 0 8px 28px rgba(232, 58, 95, 0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-input: 6px;
      --font-title: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-body: 'Inter', 'Noto Sans SC', sans-serif;
      --transition: 0.25s ease;
      --container-max: 1200px;
      --header-height: 72px;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-main);
      background-color: var(--bg-warm);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    button, input, textarea {
      font-family: var(--font-body);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 导航 */
    #header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: var(--bg-white);
      height: var(--header-height);
      box-shadow: 0 1px 8px rgba(0,0,0,0.04);
      display: flex;
      align-items: center;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 22px;
      color: var(--primary);
      letter-spacing: 0.5px;
    }
    .logo span {
      font-weight: 400;
      font-size: 14px;
      color: var(--text-soft);
      margin-left: 6px;
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-main);
      transition: color var(--transition);
      position: relative;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      border: none;
      padding: 12px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: background var(--transition), transform var(--transition);
      display: inline-flex;
      align-items: center;
      justify-content: center;
      white-space: nowrap;
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-1px);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      padding: 10px 28px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: all var(--transition);
      white-space: nowrap;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .text-link {
      color: var(--primary);
      font-weight: 500;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      position: relative;
      transition: gap var(--transition);
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 1.5px;
      background: var(--primary);
      transition: width var(--transition);
    }
    .text-link:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
      padding: 4px;
    }
    .hamburger span {
      width: 22px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: all var(--transition);
    }
    .mobile-menu {
      display: none;
    }
    /* Hero */
    #hero {
      padding: 56px 0 64px;
      background: var(--bg-white);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .hero-text h1 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 48px;
      line-height: 1.2;
      color: var(--secondary-dark);
      margin-bottom: 20px;
    }
    .hero-text .subtitle {
      font-size: 18px;
      color: var(--text-soft);
      margin-bottom: 32px;
      line-height: 1.6;
    }
    .hero-image {
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-radius: 20px;
      height: 380px;
      box-shadow: var(--shadow-md);
    }
    /* 板块通用 */
    section {
      padding: 72px 0;
    }
    .section-title {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 36px;
      line-height: 1.3;
      text-align: center;
      margin-bottom: 16px;
      color: var(--secondary-dark);
    }
    .section-desc {
      text-align: center;
      color: var(--text-soft);
      max-width: 600px;
      margin: 0 auto 48px;
    }
    /* 服务卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .card-icon {
      width: 64px;
      height: 64px;
      background: var(--primary-soft);
      border-radius: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 32px;
      margin-bottom: 20px;
      transition: transform 0.3s;
    }
    .service-card:hover .card-icon {
      transform: scale(1.05);
    }
    .service-card h3 {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 22px;
      margin-bottom: 12px;
    }
    .service-card p {
      color: var(--text-soft);
      margin-bottom: 20px;
      flex: 1;
    }
    /* 流程 */
    .steps-container {
      display: flex;
      align-items: flex-start;
      justify-content: space-between;
      position: relative;
      margin-top: 20px;
    }
    .step-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      flex: 1;
      position: relative;
    }
    .step-circle {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 20px;
      margin-bottom: 16px;
      z-index: 2;
    }
    .step-line {
      position: absolute;
      top: 24px;
      left: 70%;
      width: 60%;
      height: 2px;
      background: var(--border-light);
      z-index: 1;
    }
    .step-item:last-child .step-line {
      display: none;
    }
    .step-item h3 {
      font-family: var(--font-title);
      font-weight: 600;
      font-size: 20px;
      margin-bottom: 6px;
    }
    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s;
      position: relative;
    }
    .case-img {
      position: relative;
      aspect-ratio: 16/9;
      overflow: hidden;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-overlay {
      position: absolute;
      inset: 0;
      background: rgba(30,30,46,0.7);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      opacity: 0;
      transition: opacity 0.3s;
      color: white;
      text-align: center;
      padding: 16px;
    }
    .case-card:hover .case-overlay {
      opacity: 1;
    }
    .case-tags {
      padding: 12px 16px;
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
    }
    .tag {
      background: var(--primary-soft);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
    }
    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      margin-bottom: 12px;
      box-shadow: var(--shadow-sm);
      overflow: hidden;
    }
    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-family: var(--font-title);
      font-size: 18px;
      transition: background 0.2s;
    }
    .faq-question:hover {
      background: var(--primary-soft);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #FAFAFA;
    }
    .faq-answer p {
      padding: 0 24px 20px;
      color: var(--text-soft);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    .faq-icon {
      font-size: 20px;
      color: var(--primary);
    }
    /* CTA */
    .cta-band {
      background: var(--secondary-dark);
      padding: 64px 24px;
      text-align: center;
      color: white;
    }
    .cta-band h2 {
      font-family: var(--font-title);
      font-weight: 700;
      font-size: 36px;
      margin-bottom: 12px;
    }
    .cta-buttons {
      display: flex;
      gap: 16px;
      justify-content: center;
      margin-top: 28px;
      flex-wrap: wrap;
    }
    /* 联系表单 */
    .contact-form {
      max-width: 560px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-form input, .contact-form textarea {
      padding: 14px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-input);
      font-size: 16px;
      transition: 0.2s;
      background: white;
    }
    .contact-form input:focus, .contact-form textarea:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(232,58,95,0.1);
    }
    /* 页脚 */
    footer {
      background: var(--bg-white);
      padding: 56px 0 24px;
      border-top: 1px solid var(--border-light);
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 32px;
    }
    .footer-brand p {
      color: var(--text-soft);
      margin-top: 12px;
      font-size: 15px;
    }
    .footer-col h4 {
      font-weight: 600;
      margin-bottom: 16px;
      font-size: 16px;
    }
    .footer-col a {
      display: block;
      color: var(--text-soft);
      margin-bottom: 10px;
      font-size: 15px;
      transition: color 0.2s;
    }
    .footer-col a:hover {
      color: var(--primary);
    }
    .social-icons {
      display: flex;
      gap: 16px;
      font-size: 22px;
      margin-top: 12px;
    }
    .copyright {
      text-align: center;
      color: var(--text-soft);
      margin-top: 40px;
      font-size: 14px;
    }
    /* 响应式 */
    @media (max-width: 1024px) {
      .cards-grid, .cases-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .nav-links, .nav-container .btn-primary { display: none; }
      .hamburger { display: flex; }
      .mobile-menu.active {
        display: flex;
        flex-direction: column;
        position: fixed;
        inset: 0;
        background: white;
        z-index: 60;
        padding: 32px;
        gap: 24px;
        font-size: 20px;
      }
      .hero-grid { grid-template-columns: 1fr; text-align: center; }
      .hero-image { height: 260px; order: -1; }
      .cards-grid, .cases-grid { grid-template-columns: 1fr; }
      .steps-container { flex-direction: column; gap: 24px; }
      .step-line { display: none; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }