/* roulang page: index */
:root {
      --primary: #F85C3A;
      --primary-dark: #E94B2D;
      --secondary: #0F172A;
      --accent: #00C2BA;
      --bg: #F5F0EB;
      --card-bg: #FFFFFF;
      --text: #1E1E1E;
      --text-secondary: #5A5A5A;
      --text-muted: #B0B8C1;
      --border-light: rgba(15, 23, 42, 0.08);
      --shadow-card: 0 4px 20px rgba(15, 23, 42, 0.06);
      --shadow-card-hover: 0 12px 32px rgba(15, 23, 42, 0.12);
      --shadow-nav: 0 2px 12px rgba(0, 0, 0, 0.04);
      --radius-xl: 24px;
      --radius-lg: 20px;
      --radius-md: 16px;
      --radius-sm: 12px;
      --radius-xs: 8px;
      --space-section: 100px;
      --space-mobile-section: 60px;
      --max-width: 1280px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg);
      color: var(--text);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.2s ease;
    }

    img {
      max-width: 100%;
      display: block;
      height: auto;
    }

    button, input, textarea {
      font-family: inherit;
    }

    /* 导航栏 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(8px);
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 1000;
      border-bottom: 1px solid var(--border-light);
      transition: box-shadow 0.25s ease;
    }

    .header.scrolled {
      box-shadow: var(--shadow-nav);
    }

    .nav-container {
      max-width: var(--max-width);
      width: 100%;
      margin: 0 auto;
      padding: 0 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    .logo {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.3px;
      display: flex;
      align-items: center;
      gap: 6px;
    }

    .logo-icon {
      font-size: 1.8rem;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--secondary);
      padding: 8px 0;
      position: relative;
      transition: color 0.2s;
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary);
      border-radius: 3px;
      transition: width 0.25s ease;
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }

    .nav-links a:hover::after,
    .nav-links a.active::after {
      width: 100%;
    }

    .nav-cta {
      background: var(--primary);
      color: white;
      font-weight: 600;
      font-size: 0.9rem;
      padding: 10px 24px;
      border-radius: var(--radius-sm);
      transition: background 0.2s, transform 0.2s;
      white-space: nowrap;
    }

    .nav-cta:hover {
      background: var(--primary-dark);
      transform: translateY(-1px);
    }

    .hamburger {
      display: none;
      flex-direction: column;
      gap: 5px;
      cursor: pointer;
      background: none;
      border: none;
    }

    .hamburger span {
      width: 24px;
      height: 2.5px;
      background: var(--secondary);
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 版块通用 */
    .section {
      padding: var(--space-section) 0;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 16px;
      text-align: center;
    }

    .section-subtitle {
      color: var(--text-secondary);
      text-align: center;
      max-width: 600px;
      margin: 0 auto 48px;
      font-size: 1.05rem;
    }

    /* Hero */
    .hero {
      padding-top: 140px;
      padding-bottom: 80px;
      background: linear-gradient(135deg, #F5F0EB 0%, #FFFFFF 100%);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }

    .hero-left h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }

    .hero-left .subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      margin-bottom: 32px;
      line-height: 1.7;
    }

    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .btn-primary {
      background: var(--primary);
      color: white;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      display: inline-block;
      transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
      border: none;
      cursor: pointer;
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: 0 8px 18px rgba(248, 92, 58, 0.3);
    }

    .btn-ghost {
      background: transparent;
      color: var(--primary);
      font-weight: 600;
      padding: 12px 32px;
      border-radius: var(--radius-sm);
      border: 2px solid var(--primary);
      transition: background 0.2s, color 0.2s, transform 0.2s;
      cursor: pointer;
    }

    .btn-ghost:hover {
      background: rgba(248, 92, 58, 0.08);
      transform: translateY(-2px);
    }

    .hero-stats {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }

    .stat-badge {
      background: rgba(255,255,255,0.8);
      backdrop-filter: blur(4px);
      padding: 12px 18px;
      border-radius: var(--radius-xs);
      box-shadow: 0 4px 12px rgba(0,0,0,0.02);
      text-align: center;
    }

    .stat-number {
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--accent);
    }

    .stat-label {
      font-size: 0.8rem;
      color: var(--text-secondary);
      margin-top: 4px;
    }

    .hero-right {
      background: var(--secondary);
      border-radius: var(--radius-xl);
      overflow: hidden;
      position: relative;
      height: 380px;
    }

    .hero-right img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.9;
    }

    .hero-overlay {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(248,92,58,0.15) 0%, rgba(15,23,42,0.1) 100%);
    }

    /* 优势 */
    .advantage-grid {
      display: grid;
      grid-template-columns: 1fr 1.2fr 1fr;
      gap: 32px;
    }

    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: transform 0.25s, box-shadow 0.25s;
      position: relative;
      overflow: hidden;
    }

    .advantage-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-card-hover);
    }

    .advantage-icon {
      font-size: 2.2rem;
      color: var(--accent);
      margin-bottom: 20px;
    }

    .advantage-card h3 {
      font-size: 1.4rem;
      margin-bottom: 12px;
      color: var(--secondary);
    }

    .advantage-card p {
      color: var(--text-secondary);
      line-height: 1.7;
    }

    .stat-float {
      position: absolute;
      bottom: 16px;
      right: 20px;
      background: rgba(248,92,58,0.1);
      color: var(--primary);
      font-weight: 700;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.9rem;
    }

    /* 服务 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      padding: 32px 28px;
      box-shadow: var(--shadow-card);
      transition: all 0.25s;
      border: 1px solid transparent;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-card-hover);
      border-color: rgba(248,92,58,0.15);
    }

    .service-icon {
      background: linear-gradient(135deg, var(--primary), var(--primary-dark));
      width: 48px;
      height: 48px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 1.6rem;
      margin-bottom: 20px;
    }

    .service-card h3 {
      margin-bottom: 12px;
    }

    .service-link {
      color: var(--primary);
      font-weight: 600;
      margin-top: 18px;
      display: inline-block;
    }

    /* 流程 */
    .flow-steps {
      display: flex;
      justify-content: space-between;
      align-items: flex-start;
      position: relative;
    }

    .flow-steps::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 36px;
      right: 36px;
      height: 2px;
      background: repeating-linear-gradient(to right, var(--accent) 0px, var(--accent) 6px, transparent 6px, transparent 12px);
    }

    .step {
      text-align: center;
      z-index: 2;
      flex: 1;
    }

    .step-number {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: white;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      margin: 0 auto 16px;
      font-size: 1.2rem;
    }

    .step h4 {
      color: var(--secondary);
      margin-bottom: 8px;
    }

    /* 案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .case-card {
      background: var(--card-bg);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-card);
      transition: 0.25s;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-card-hover);
    }

    .case-img {
      height: 200px;
      background: var(--secondary);
    }

    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-content {
      padding: 24px;
    }

    .case-tag {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.75rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 12px;
    }

    .case-data {
      color: var(--accent);
      font-weight: 800;
      margin: 10px 0;
    }

    /* FAQ */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--card-bg);
      border-radius: var(--radius-sm);
      margin-bottom: 16px;
      box-shadow: var(--shadow-card);
      overflow: hidden;
    }

    .faq-question {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--secondary);
    }

    .faq-icon {
      font-size: 1.4rem;
      color: var(--accent);
      transition: 0.3s;
    }

    .faq-answer {
      padding: 0 24px 20px;
      color: var(--text-secondary);
      display: none;
    }

    .faq-item.open .faq-answer {
      display: block;
    }

    .faq-item.open .faq-icon {
      transform: rotate(45deg);
    }

    /* CTA */
    .cta-band {
      background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
      color: white;
      padding: 80px 0;
      text-align: center;
      border-radius: var(--radius-xl);
      margin: 80px 24px;
    }

    .cta-band h2 {
      color: white;
      font-size: 2.2rem;
    }

    .btn-white {
      background: white;
      color: var(--primary);
      font-weight: 700;
      padding: 14px 36px;
      border-radius: var(--radius-sm);
      display: inline-block;
      margin-top: 24px;
    }

    /* 页脚 */
    .footer {
      background: var(--secondary);
      color: var(--text-muted);
      padding: 60px 0 30px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1.5fr 1.5fr;
      gap: 40px;
    }

    .footer-logo {
      font-size: 1.5rem;
      font-weight: 800;
      color: white;
      margin-bottom: 16px;
    }

    .copyright {
      text-align: center;
      margin-top: 40px;
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 20px;
    }

    /* 移动端 */
    @media (max-width: 1024px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-right { height: 300px; }
      .advantage-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
    }

    @media (max-width: 768px) {
      .header { height: 64px; }
      .nav-links { display: none; }
      .hamburger { display: flex; }
      .nav-container { justify-content: space-between; }
      .hero { padding-top: 100px; }
      .hero-left h1 { font-size: 2.2rem; }
      .flow-steps { flex-direction: column; gap: 24px; }
      .flow-steps::before { display: none; }
      .cases-grid { grid-template-columns: 1fr; }
      .service-grid { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .cta-band { margin: 60px 16px; border-radius: var(--radius-lg); }
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 0; left: 0; right: 0; bottom: 0;
      background: rgba(255,255,255,0.98);
      z-index: 999;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      gap: 32px;
    }

    .mobile-menu a {
      font-size: 1.4rem;
      font-weight: 600;
    }