/* roulang page: index */
:root {
      --primary: #C41E3A;
      --primary-hover: #A01830;
      --secondary: #0E9C5E;
      --secondary-hover: #0B7A4A;
      --bg: #F9FAFB;
      --card-bg: #FFFFFF;
      --text-dark: #1F2937;
      --text-soft: #6B7280;
      --white: #FFFFFF;
      --border-light: #E5E7EB;
      --shadow-sm: 0 4px 20px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 30px rgba(0,0,0,0.10);
      --radius-card: 16px;
      --radius-btn: 12px;
      --radius-pill: 999px;
      --transition: 0.3s ease;
      --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-stack);
      background-color: var(--bg);
      color: var(--text-dark);
      line-height: 1.5;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航 */
    .header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 72px;
      background: var(--white);
      box-shadow: 0 1px 3px rgba(0,0,0,0.04);
      z-index: 1000;
      display: flex;
      align-items: center;
    }
    
    .header .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: 1px;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo span {
      background: linear-gradient(135deg, var(--primary) 0%, #A01830 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }
    .logo small {
      font-size: 0.7rem;
      font-weight: 500;
      color: var(--text-soft);
      letter-spacing: 0.5px;
      -webkit-text-fill-color: var(--text-soft);
      background: none;
    }
    
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-menu a {
      text-decoration: none;
      color: var(--text-dark);
      font-weight: 500;
      font-size: 1rem;
      position: relative;
      padding: 8px 0;
      transition: color 0.2s;
    }
    .nav-menu a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0%;
      height: 2px;
      background: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-menu a:hover {
      color: var(--primary);
    }
    .nav-menu a:hover::after {
      width: 100%;
    }
    
    .btn {
      display: inline-block;
      font-weight: 600;
      border-radius: var(--radius-btn);
      padding: 14px 32px;
      text-decoration: none;
      transition: background 0.2s, color 0.2s, border 0.2s;
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--primary);
      color: var(--white);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
    }
    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }
    
    .hamburger {
      display: none;
      font-size: 1.6rem;
      background: none;
      border: none;
      color: var(--text-dark);
      cursor: pointer;
    }
    
    /* 板块间距 */
    section {
      padding: 100px 0;
    }
    
    /* Hero */
    .hero {
      height: 100vh;
      min-height: 700px;
      background: linear-gradient(135deg, #C41E3A 0%, #B81D35 40%, #0E9C5E 100%);
      position: relative;
      display: flex;
      align-items: center;
      color: var(--white);
      margin-top: 72px;
      overflow: hidden;
    }
    .hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: rgba(0,0,0,0.35);
      z-index: 1;
    }
    .hero .container {
      position: relative;
      z-index: 2;
      text-align: center;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 28px;
    }
    .hero h1 {
      font-size: 3rem;
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: 1px;
    }
    .hero .subtitle {
      font-size: 1.125rem;
      color: rgba(255,255,255,0.9);
      max-width: 680px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      justify-content: center;
      margin-top: 10px;
    }
    .hero-badges {
      display: flex;
      gap: 24px;
      margin-top: 40px;
      flex-wrap: wrap;
      justify-content: center;
    }
    .badge-pill {
      background: rgba(255,255,255,0.15);
      backdrop-filter: blur(10px);
      border-radius: 999px;
      padding: 12px 28px;
      color: var(--white);
      display: flex;
      align-items: center;
      gap: 8px;
      font-weight: 500;
    }
    .badge-pill .num {
      font-weight: 800;
      font-size: 1.4rem;
      color: var(--secondary);
      margin-right: 4px;
    }
    
    /* 通用标题 */
    .section-title {
      font-size: 2.25rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: var(--text-dark);
    }
    .section-desc {
      color: var(--text-soft);
      max-width: 700px;
      margin-bottom: 48px;
      font-size: 1.1rem;
    }
    
    /* 痛点 */
    .pain-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .pain-image img {
      width: 100%;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
    }
    
    /* 解决方案卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .solution-card {
      background: var(--card-bg);
      border-radius: var(--radius-card);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .solution-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .card-img {
      height: 200px;
      background-size: cover;
      background-position: center;
    }
    .card-content {
      padding: 24px;
    }
    .card-content h3 {
      font-size: 1.5rem;
      font-weight: 600;
      margin-bottom: 12px;
    }
    .text-link {
      color: var(--primary);
      font-weight: 600;
      text-decoration: none;
      margin-top: 16px;
      display: inline-block;
    }
    
    /* 优势交替 */
    .adv-row {
      display: flex;
      align-items: center;
      gap: 60px;
      margin-bottom: 80px;
    }
    .adv-row.reverse {
      flex-direction: row-reverse;
    }
    .adv-text {
      flex: 1;
    }
    .adv-image {
      flex: 1;
      background: #eee;
      border-radius: var(--radius-card);
      height: 300px;
      background-size: cover;
    }
    .stat-badge {
      display: inline-flex;
      align-items: baseline;
      background: linear-gradient(135deg, var(--secondary), var(--secondary-hover));
      color: white;
      padding: 12px 24px;
      border-radius: 999px;
      font-weight: 700;
      font-size: 1.3rem;
      margin-top: 16px;
    }
    
    /* 数据成果 */
    .results-grid {
      display: flex;
      justify-content: center;
      gap: 48px;
      flex-wrap: wrap;
    }
    .result-item {
      background: linear-gradient(135deg, var(--secondary), #0B7A4A);
      border-radius: 999px;
      padding: 24px 48px;
      color: white;
      text-align: center;
    }
    .result-num {
      font-size: 2.5rem;
      font-weight: 800;
    }
    
    /* 证言 */
    .testimonials-grid {
      display: flex;
      gap: 32px;
      overflow-x: auto;
      padding-bottom: 16px;
    }
    .testimonial-card {
      background: #F3F4F6;
      border-radius: var(--radius-card);
      padding: 32px;
      min-width: 400px;
      flex-shrink: 0;
    }
    
    /* 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;
      font-size: 1.1rem;
    }
    .faq-answer {
      padding-top: 16px;
      color: var(--text-soft);
      display: none;
    }
    .faq-item.open .faq-answer {
      display: block;
    }
    
    /* CTA */
    .cta-section {
      background: linear-gradient(90deg, #C41E3A, #0E9C5E);
      color: white;
      text-align: center;
      padding: 80px 0;
    }
    
    /* 页脚 */
    .footer {
      background: #1F2937;
      color: #9CA3AF;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    .footer a {
      color: #9CA3AF;
      text-decoration: none;
    }
    .footer a:hover {
      color: var(--secondary);
    }
    
    @media (max-width: 1024px) {
      .cards-grid { grid-template-columns: repeat(2,1fr); }
    }
    @media (max-width: 768px) {
      .hamburger { display: block; }
      .nav-menu {
        display: none;
        position: fixed; top:72px; left:0; width:100%; background: white;
        flex-direction: column; padding: 24px; gap: 20px; box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-menu.open { display: flex; }
      .pain-grid, .adv-row { grid-template-columns: 1fr; flex-direction: column; }
      .cards-grid { grid-template-columns: 1fr; }
      .testimonial-card { min-width: 280px; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero h1 { font-size: 2rem; }
    }