/* roulang page: index */
* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    :root {
      --primary: #F15A24;
      --primary-hover: #D94A1A;
      --secondary: #1B4332;
      --accent: #F9A826;
      --bg-light: #FAF9F6;
      --bg-white: #FFFFFF;
      --text-main: #1A1A1A;
      --text-secondary: #5C5C5C;
      --text-on-dark: #FFFFFF;
      --border-light: #E5E1DA;
      --success: #2D9A4E;
      --shadow-card: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
      --radius-card: 16px;
      --radius-pill: 50px;
      --radius-img: 12px;
      --font-sans: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, -apple-system, sans-serif;
      --font-number: "Inter", "Segoe UI", system-ui, sans-serif;
      --max-width: 1200px;
    }
    html {
      scroll-behavior: smooth;
    }
    body {
      font-family: var(--font-sans);
      background-color: var(--bg-white);
      color: var(--text-main);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
      width: 100%;
    }
    /* 图片自适应 */
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    /* 导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(12px);
      box-shadow: 0 1px 0 var(--border-light);
      z-index: 999;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .logo a {
      display: flex;
      align-items: center;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 22px;
      gap: 8px;
    }
    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--primary);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 18px;
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .main-nav a {
      text-decoration: none;
      color: var(--text-secondary);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
      position: relative;
    }
    .main-nav a:hover {
      color: var(--primary);
    }
    .main-nav a::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: -4px;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .main-nav a:hover::after {
      width: 100%;
    }
    .header-cta {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-pill);
      padding: 10px 24px;
      font-size: 15px;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
    }
    .btn-primary {
      background: var(--primary);
      color: white;
      box-shadow: 0 4px 12px rgba(241,90,36,0.3);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      box-shadow: 0 8px 18px rgba(241,90,36,0.4);
      transform: translateY(-1px);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: white;
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 26px;
      color: var(--text-main);
      cursor: pointer;
    }
    /* 移动端导航面板 */
    .mobile-menu {
      display: none;
    }
    /* HERO */
    .hero {
      padding: 140px 0 100px;
      background: radial-gradient(circle at 70% 30%, rgba(241,90,36,0.04) 0%, rgba(255,255,255,0) 60%);
      position: relative;
      overflow: hidden;
    }
    .hero::before {
      content: "";
      position: absolute;
      right: -10%;
      top: 20%;
      width: 450px;
      height: 450px;
      background: url('/assets/images/backpic/back-1.webp') center/contain no-repeat;
      opacity: 0.15;
      pointer-events: none;
      border-radius: 50%;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .hero-content {
      flex: 1 1 500px;
    }
    .hero-content h1 {
      font-size: clamp(38px, 6vw, 58px);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 24px;
    }
    .hero-content .highlight {
      color: var(--primary);
      position: relative;
      z-index: 1;
    }
    .hero-sub {
      font-size: 18px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      max-width: 480px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .hero-image {
      flex: 1 1 420px;
      position: relative;
    }
    .hero-image img {
      width: 100%;
      height: auto;
      border-radius: 32px;
      box-shadow: 0 20px 40px rgba(0,0,0,0.2);
    }
    /* 区块通用 */
    .section {
      padding: 90px 0;
    }
    .section-dark {
      background: var(--secondary);
      color: var(--text-on-dark);
    }
    .section-title {
      font-size: 34px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .section-sub {
      color: var(--text-secondary);
      font-size: 18px;
      margin-bottom: 48px;
    }
    .section-dark .section-sub {
      color: rgba(255,255,255,0.7);
    }
    .text-center {
      text-align: center;
    }
    /* 错位卡片网格 (功能) 2+1 不规则感 */
    .features-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
      justify-content: center;
    }
    .feature-card {
      background: white;
      padding: 36px 28px;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      flex: 1 1 280px;
      max-width: 340px;
      transition: all 0.3s ease;
      text-align: center;
      border: 1px solid rgba(0,0,0,0.03);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-hover);
    }
    .feature-icon {
      font-size: 42px;
      color: var(--primary);
      margin-bottom: 20px;
    }
    .feature-card h3 {
      font-size: 22px;
      margin-bottom: 14px;
    }
    .scenarios-row {
      display: flex;
      flex-wrap: wrap;
      gap: 38px;
    }
    .scenario-block {
      display: flex;
      flex: 1 1 360px;
      background: white;
      border-radius: 24px;
      overflow: hidden;
      box-shadow: var(--shadow-card);
      align-items: center;
    }
    .scenario-img {
      width: 45%;
      object-fit: cover;
      min-height: 220px;
    }
    .scenario-text {
      padding: 28px;
      width: 55%;
    }
    .case-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 30px;
    }
    .case-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 30px;
      flex: 1 1 260px;
      box-shadow: var(--shadow-card);
      border-left: 6px solid var(--primary);
    }
    .case-stat {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 800;
      color: var(--primary);
    }
    .pricing-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 28px;
      justify-content: center;
    }
    .price-card {
      background: white;
      border-radius: 24px;
      padding: 38px 25px;
      flex: 1 1 240px;
      max-width: 300px;
      box-shadow: var(--shadow-card);
      position: relative;
      transition: all 0.3s;
      border: 2px solid transparent;
    }
    .price-card.recommended {
      border-color: var(--accent);
      transform: scale(1.05);
      box-shadow: 0 20px 36px rgba(0,0,0,0.15);
    }
    .price-amount {
      font-size: 42px;
      font-weight: 800;
      font-family: var(--font-number);
    }
    .faq-item {
      background: #F5F2ED;
      border-radius: 12px;
      margin-bottom: 16px;
      padding: 20px 24px;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 700;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      margin-top: 14px;
      color: var(--text-secondary);
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .cta-tail {
      padding: 100px 0;
      text-align: center;
      background: var(--secondary);
      background-image: url('/assets/images/backpic/back-2.webp');
      background-size: cover;
      background-position: center;
    }
    .footer-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 48px;
      padding: 60px 0 30px;
    }
    @media (max-width: 1024px) {
      .hero-grid {
        flex-direction: column;
        text-align: center;
      }
      .hero-sub {
        margin-left: auto;
        margin-right: auto;
      }
      .hero-actions {
        justify-content: center;
      }
      .main-nav {
        gap: 18px;
      }
    }
    @media (max-width: 768px) {
      .main-nav, .header-cta .btn-outline {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .mobile-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: white;
        flex-direction: column;
        gap: 20px;
        padding: 28px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.1);
        z-index: 99;
      }
      .mobile-menu.active {
        display: flex;
      }
      .scenario-block {
        flex-direction: column;
      }
      .scenario-img, .scenario-text {
        width: 100%;
      }
    }