/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #00E676;
      --primary-dark: #00C853;
      --secondary: #7B1FA2;
      --secondary-dark: #4A148C;
      --accent: #FF6D00;
      --bg-light: #F5F7FA;
      --bg-white: #FFFFFF;
      --text-dark: #1A1A2E;
      --text-mid: #4A4A5A;
      --text-light: #8A8A9A;
      --card-bg: #FFFFFF;
      --card-tint: #F0FFFA;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 12px 32px rgba(0, 230, 118, 0.15);
      --radius-card: 20px;
      --radius-btn: 16px;
      --radius-pill: 24px;
      --radius-input: 8px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
      --font-number: "Inter", "SF Pro Display", -apple-system, sans-serif;
      --transition: all 0.25s ease;
      --container-max: 1200px;
    }
    body {
      font-family: var(--font-sans);
      background: var(--bg-light);
      color: var(--text-mid);
      line-height: 1.6;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    h1, h2, h3, .hero-title, .section-title, .card-title, .stat-number {
      font-family: var(--font-sans);
      color: var(--text-dark);
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 导航栏 - 分屏Hero联动导航 */
    .navbar {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 64px;
      background: rgba(255,255,255,0.88);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      box-shadow: 0 2px 12px rgba(0,0,0,0.03);
      z-index: 1000;
      display: flex;
      align-items: center;
      font-family: var(--font-sans);
    }
    .nav-container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo-area {
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 700;
      font-size: 22px;
      color: var(--text-dark);
      text-decoration: none;
      letter-spacing: -0.3px;
    }
    .logo-icon {
      font-size: 28px;
      color: var(--primary);
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      text-decoration: none;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: var(--transition);
    }
    .nav-links a:hover {
      color: var(--primary-dark);
      border-bottom-color: var(--primary);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn-nav {
      background: var(--primary);
      color: white;
      border: none;
      padding: 10px 20px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 15px;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      line-height: 1.2;
    }
    .btn-nav:hover {
      background: var(--primary-dark);
      box-shadow: 0 6px 16px rgba(0,230,118,0.35);
      transform: translateY(-1px);
    }
    .hamburger {
      display: none;
      background: none;
      border: none;
      font-size: 28px;
      color: var(--text-dark);
      cursor: pointer;
      padding: 4px;
    }
    /* Hero 分屏 */
    .hero {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding-top: 64px;
      background: var(--bg-white);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 40px;
      align-items: center;
      width: 100%;
    }
    .hero-content {
      padding: 20px 0;
    }
    .hero-title {
      font-size: 52px;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      color: var(--text-dark);
      letter-spacing: -0.5px;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-mid);
      margin-bottom: 32px;
      max-width: 480px;
    }
    .hero-cta {
      display: flex;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #fff;
      border: none;
      padding: 14px 34px;
      border-radius: 30px;
      font-weight: 700;
      font-size: 17px;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
      box-shadow: 0 4px 14px rgba(0,230,118,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 10px 24px rgba(0,230,118,0.45);
      transform: scale(1.03);
    }
    .btn-outline {
      background: transparent;
      border: 2px solid var(--secondary);
      color: var(--secondary);
      padding: 12px 32px;
      border-radius: 30px;
      font-weight: 600;
      font-size: 17px;
      cursor: pointer;
      transition: var(--transition);
      text-decoration: none;
      display: inline-block;
    }
    .btn-outline:hover {
      background: rgba(123,31,162,0.08);
      border-color: var(--secondary-dark);
    }
    .stats-row {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .stat-badge {
      background: rgba(255,255,255,0.9);
      backdrop-filter: blur(4px);
      padding: 16px 20px;
      border-radius: 20px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      min-width: 110px;
    }
    .stat-number {
      font-family: var(--font-number);
      font-weight: 700;
      font-size: 32px;
      color: var(--primary-dark);
      display: block;
    }
    .stat-label {
      font-size: 13px;
      color: var(--text-light);
      letter-spacing: 0.3px;
    }
    .hero-visual {
      position: relative;
      background: linear-gradient(135deg, #7B1FA2 0%, #00C853 100%);
      border-radius: 40px;
      overflow: hidden;
      height: 500px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .hero-visual img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.85;
      mix-blend-mode: overlay;
    }
    .hero-visual::after {
      content: "";
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 20% 30%, rgba(0,230,118,0.25), transparent 70%);
    }
    /* 通用板块 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.3px;
    }
    .section-sub {
      font-size: 18px;
      color: var(--text-light);
      margin-bottom: 48px;
    }
    /* 核心优势 非对称网格 */
    .advantages-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 28px;
    }
    .advantage-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }
    .advantage-card:hover {
      transform: translateY(-8px);
      box-shadow: var(--shadow-hover);
    }
    .adv-icon {
      font-size: 36px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .adv-title {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 12px;
    }
    .stack-cards {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    /* 服务卡片 2x2 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }
    .service-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .service-img {
      height: 200px;
      background: #eef7f2;
      position: relative;
    }
    .service-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .service-content {
      padding: 24px;
    }
    .service-tags {
      display: flex;
      gap: 8px;
      flex-wrap: wrap;
      margin: 12px 0;
    }
    .tag {
      background: var(--card-tint);
      color: var(--primary-dark);
      padding: 4px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
    }
    /* 流程步骤 */
    .steps-vertical {
      display: flex;
      flex-direction: column;
      gap: 32px;
      max-width: 800px;
      margin: 0 auto;
    }
    .step-item {
      display: flex;
      gap: 24px;
      align-items: flex-start;
    }
    .step-number {
      font-family: var(--font-number);
      font-size: 52px;
      font-weight: 800;
      color: rgba(0,230,118,0.2);
      line-height: 1;
      min-width: 70px;
    }
    .step-text h3 {
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    /* 案例数据 */
    .case-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .case-image img {
      width: 100%;
      border-radius: 28px;
    }
    .data-wall {
      display: flex;
      flex-wrap: wrap;
      gap: 24px;
    }
    .data-card {
      background: white;
      padding: 28px;
      border-radius: 24px;
      box-shadow: var(--shadow-sm);
      flex: 1 1 140px;
    }
    /* FAQ */
    .faq-card {
      background: var(--card-bg);
      border-radius: 28px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .faq-item {
      border-bottom: 1px solid #eef2f0;
      padding: 18px 0;
    }
    .faq-question {
      display: flex;
      align-items: center;
      gap: 16px;
      font-weight: 700;
      font-size: 18px;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      background: #F0FFFA;
      margin-top: 12px;
      border-left: 4px solid var(--primary);
      padding: 0 20px;
      border-radius: 0 12px 12px 0;
    }
    .faq-answer.open {
      max-height: 200px;
      padding: 16px 20px;
    }
    /* CTA */
    .cta-section {
      background: linear-gradient(120deg, #6A1B9A 0%, #00C853 100%);
      color: white;
      text-align: center;
      border-radius: 40px;
      margin: 60px 24px;
      padding: 70px 30px;
    }
    .cta-form input {
      padding: 14px 18px;
      border-radius: 30px;
      border: none;
      margin: 10px 6px;
      width: 240px;
    }
    /* 页脚 */
    .footer {
      background: #4A148C;
      color: #ddd;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
    }
    @media (max-width: 992px) {
      .hero-grid { grid-template-columns: 1fr; }
      .hero-visual { height: 350px; order: -1; }
      .advantages-grid { grid-template-columns: 1fr; }
      .services-grid { grid-template-columns: 1fr; }
      .case-layout { grid-template-columns: 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero-title { font-size: 36px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }