/* roulang page: index */
:root {
      --primary: #E53935;
      --primary-dark: #C62828;
      --primary-light: #FFEBEE;
      --accent-gold: #FFB300;
      --accent-gold-light: #FFF8E1;
      --text-dark: #1E1E1E;
      --text-gray: #555555;
      --text-light: #B0B0B0;
      --bg-light: #FAFAFA;
      --bg-white: #FFFFFF;
      --bg-dark: #1A1A1A;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
      --shadow-lg: 0 12px 32px rgba(0,0,0,0.14);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --transition: 0.25s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-stack);
      background-color: var(--bg-white);
      color: var(--text-dark);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

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

    button, .btn {
      cursor: pointer;
      font-family: var(--font-stack);
      transition: var(--transition);
      border: none;
      outline: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
    }

    /* 导航 */
    .header {
      position: sticky;
      top: 0;
      width: 100%;
      background: rgba(255,255,255,0.92);
      backdrop-filter: blur(12px);
      height: 72px;
      display: flex;
      align-items: center;
      z-index: 1000;
      box-shadow: 0 2px 12px rgba(0,0,0,0.04);
      transition: var(--transition);
    }

    .header.scrolled {
      box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    }

    .nav {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }

    .logo {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      font-size: 28px;
      color: var(--accent-gold);
    }

    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
      list-style: none;
    }

    .nav-links a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-dark);
      position: relative;
      padding: 8px 0;
      transition: var(--transition);
    }

    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: width 0.2s ease;
    }

    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }

    .hamburger {
      display: none;
      font-size: 24px;
      background: none;
      border: none;
      color: var(--text-dark);
    }

    .mobile-menu {
      display: none;
      position: fixed;
      top: 72px;
      left: 0;
      width: 100%;
      background: rgba(20,20,20,0.9);
      backdrop-filter: blur(16px);
      padding: 24px 0;
      flex-direction: column;
      align-items: center;
      gap: 20px;
      z-index: 999;
    }
    .mobile-menu a {
      color: white;
      font-size: 20px;
      font-weight: 500;
    }

    /* 按钮 */
    .btn-primary {
      background: var(--primary);
      color: white;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
      font-size: 16px;
      box-shadow: 0 4px 12px rgba(229,57,53,0.25);
    }
    .btn-primary:hover {
      background: var(--primary-dark);
      box-shadow: 0 8px 20px rgba(229,57,53,0.35);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      font-weight: 600;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }

    /* Hero */
    .hero {
      height: 85vh;
      min-height: 600px;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero::before {
      content: '';
      position: absolute;
      top: 0; left: 0; width: 100%; height: 100%;
      background: linear-gradient(135deg, rgba(0,0,0,0.75) 0%, rgba(0,0,0,0.35) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 1;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 24px;
    }
    .hero .subtitle {
      font-size: 18px;
      color: rgba(255,255,255,0.9);
      margin-bottom: 40px;
    }
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }
    .live-badge {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(4px);
      border-radius: 40px;
      padding: 8px 20px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
      margin-top: 30px;
      font-size: 14px;
    }

    /* 板块通用 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-desc {
      color: var(--text-gray);
      font-size: 16px;
      margin-bottom: 48px;
    }

    /* 痛点对比 */
    .compare-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .compare-card {
      padding: 32px;
      border-radius: var(--radius-card);
      background: #f5f5f5;
      transition: var(--transition);
    }
    .compare-card.highlight {
      background: var(--primary-light);
      border: 1px solid var(--primary);
    }

    /* 核心优势 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .feature-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }
    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
    }
    .feature-icon {
      width: 64px;
      height: 64px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 20px;
      font-size: 28px;
      color: var(--primary);
    }

    /* 服务产品 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .service-card {
      background: white;
      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-md);
    }
    .service-img {
      height: 180px;
      background-size: cover;
      background-position: center;
    }
    .service-body {
      padding: 20px;
    }

    /* 数据证言 */
    .proof-row {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 48px;
      align-items: center;
    }
    .big-numbers {
      display: flex;
      flex-direction: column;
      gap: 32px;
    }
    .testimonial-cards {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    /* FAQ */
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      padding: 20px 0;
    }
    .faq-question {
      font-weight: 600;
      display: flex;
      justify-content: space-between;
      cursor: pointer;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      background: #f9f9f9;
      margin-top: 12px;
      padding: 0 16px;
      border-radius: 8px;
    }

    /* CTA */
    .cta-section {
      background: var(--primary);
      color: white;
      text-align: center;
      padding: 80px 0;
    }

    /* 页脚 */
    .footer {
      background: var(--bg-dark);
      color: var(--text-light);
      padding: 40px 0;
      text-align: center;
    }

    @media (max-width: 1024px) {
      .features-grid, .services-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .hero h1 { font-size: 32px; }
      .compare-grid, .proof-row { grid-template-columns: 1fr; }
      .features-grid, .services-grid { grid-template-columns: 1fr; }
      .btn { width: 100%; }
    }