/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary-deep: #0A0E17;
      --accent-red: #E43D2A;
      --accent-red-hover: #C62818;
      --gold: #D4AF37;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-title: #0A0E17;
      --text-body: #2C3E50;
      --text-muted: #6B7B8D;
      --border-light: #E9ECEF;
      --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-tag: 4px;
      --font-sans: 'Noto Sans SC', sans-serif;
      --font-inter: 'Inter', sans-serif;
      --max-width: 1280px;
      --space-section: 120px;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    h1, h2, h3, h4 {
      font-family: var(--font-sans);
      color: var(--text-title);
      font-weight: 700;
    }
    h1 {
      font-size: 56px;
      line-height: 1.1;
      letter-spacing: -0.5px;
    }
    h2 {
      font-size: 40px;
      line-height: 1.2;
      margin-bottom: 16px;
    }
    h3 {
      font-size: 24px;
      line-height: 1.3;
    }
    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      margin-bottom: 40px;
      max-width: 640px;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: color 0.25s ease;
    }
    img {
      max-width: 100%;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: var(--font-sans);
      border: none;
      background: none;
      font-weight: 600;
      transition: all 0.25s ease;
    }
    /* 导航 */
    .main-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(0,0,0,0.05);
      transition: background 0.3s;
    }
    .header-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .logo {
      font-family: var(--font-inter);
      font-weight: 800;
      font-size: 24px;
      letter-spacing: -0.5px;
      color: var(--text-title);
    }
    .logo span {
      color: var(--accent-red);
    }
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    .nav-links a {
      font-weight: 500;
      font-size: 16px;
      color: var(--text-body);
      position: relative;
      padding: 8px 0;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--accent-red);
    }
    .nav-links a.active::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 3px;
      background: var(--accent-red);
      border-radius: 2px;
    }
    .btn-primary {
      background: var(--accent-red);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      border: none;
      transition: all 0.25s ease;
      font-size: 16px;
    }
    .btn-primary:hover {
      background: var(--accent-red-hover);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      color: var(--text-title);
      border: 2px solid var(--text-title);
      padding: 12px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: var(--text-title);
      color: white;
    }
    .text-link {
      color: var(--accent-red);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      position: relative;
    }
    .text-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-red);
      transition: width 0.25s;
    }
    .text-link:hover::after {
      width: 100%;
    }
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 6px;
      cursor: pointer;
    }
    .hamburger span {
      width: 28px;
      height: 3px;
      background: var(--text-title);
      transition: 0.3s;
    }
    /* 移动端导航 */
    .mobile-menu {
      position: fixed;
      top: 0;
      right: -100%;
      width: 80%;
      max-width: 400px;
      height: 100vh;
      background: var(--primary-deep);
      z-index: 200;
      display: flex;
      flex-direction: column;
      padding: 80px 32px;
      transition: right 0.4s ease;
      gap: 24px;
    }
    .mobile-menu.active {
      right: 0;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 500;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      padding-bottom: 12px;
    }
    .overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.5);
      z-index: 150;
      display: none;
    }
    /* Hero */
    .hero {
      display: flex;
      align-items: center;
      background: linear-gradient(90deg, #FFFFFF 55%, #F0F2F5 55%);
      min-height: 85vh;
      padding: 40px 0;
    }
    .hero-content {
      flex: 1;
      padding-right: 48px;
    }
    .hero-image {
      flex: 1;
      position: relative;
      display: flex;
      justify-content: center;
      align-items: center;
    }
    .hero-image img {
      border-radius: 16px;
      width: 100%;
      height: auto;
      object-fit: cover;
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      animation: breathe 6s infinite ease-in-out;
    }
    @keyframes breathe {
      0% { transform: scale(1); }
      50% { transform: scale(1.02); }
      100% { transform: scale(1); }
    }
    .data-badge {
      position: absolute;
      bottom: 20px;
      right: 20px;
      background: white;
      padding: 16px 24px;
      border-radius: 12px;
      box-shadow: var(--shadow-hover);
      font-weight: 700;
      font-size: 20px;
      color: var(--text-title);
    }
    .data-badge span {
      color: var(--gold);
      font-size: 28px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      margin: 32px 0 24px;
    }
    .trust-text {
      font-size: 14px;
      color: var(--text-muted);
    }
    /* 通用区块 */
    section {
      padding: var(--space-section) 0;
    }
    .section-title {
      text-align: center;
      margin-bottom: 16px;
    }
    .center {
      text-align: center;
    }
    /* 亮点网格 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 48px;
    }
    .feature-card {
      background: white;
      padding: 32px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: all 0.3s ease;
      border: 1px solid var(--border-light);
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 48px;
      color: var(--accent-red);
      margin-bottom: 20px;
    }
    /* 服务瀑布流 */
    .service-row {
      display: flex;
      align-items: center;
      gap: 40px;
      margin-bottom: 80px;
    }
    .service-row.reverse {
      flex-direction: row-reverse;
    }
    .service-text, .service-img {
      flex: 1;
    }
    .service-img img {
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    .service-number {
      font-size: 48px;
      font-weight: 800;
      color: #E9ECEF;
      font-family: var(--font-inter);
    }
    /* 方案对比 */
    .pricing-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 40px;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      border: 1px solid var(--border-light);
      text-align: center;
      position: relative;
      transition: 0.3s;
    }
    .pricing-card.featured {
      border: 2px solid var(--accent-red);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }
    .badge {
      background: var(--gold);
      color: white;
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 12px;
      font-weight: 700;
      position: absolute;
      top: -12px;
      right: 20px;
    }
    .price {
      font-size: 40px;
      font-weight: 800;
      color: var(--text-title);
      margin: 20px 0;
    }
    /* FAQ */
    .faq-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-top: 40px;
    }
    .faq-item {
      background: white;
      border-radius: var(--radius-card);
      padding: 20px 24px;
      border: 1px solid var(--border-light);
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-muted);
      margin-top: 0;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    /* CTA */
    .cta-band {
      background: var(--primary-deep);
      color: white;
      text-align: center;
    }
    .cta-form {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 32px;
    }
    .cta-form input {
      padding: 14px 20px;
      border-radius: var(--radius-btn);
      border: none;
      min-width: 200px;
    }
    /* 页脚 */
    .footer {
      background: #1A1F2B;
      color: #B0B8C1;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a:hover {
      color: white;
    }
    @media (max-width: 1024px) {
      h1 { font-size: 42px; }
      .hero { flex-direction: column; background: white; }
      .features-grid { grid-template-columns: repeat(2,1fr); }
      .pricing-grid { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: flex; }
      h1 { font-size: 36px; }
      .features-grid, .faq-grid { grid-template-columns: 1fr; }
      .service-row, .service-row.reverse { flex-direction: column; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }