/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary-deep-green: #0A4D3C;
      --primary-dark-green: #073B2D;
      --accent-orange: #F85C3C;
      --accent-orange-hover: #E0482F;
      --bg-warm-gray: #F5F4F0;
      --bg-light-gray: #EBEBE7;
      --card-white: #FFFFFF;
      --text-charcoal: #1E1E1E;
      --text-muted: #5A5A5A;
      --border-light: rgba(0,0,0,0.08);
      --shadow-sm: 0 4px 16px rgba(0,0,0,0.05);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
      --shadow-hover: 0 12px 28px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-button: 30px;
      --transition-base: 0.25s ease;
      --font-heading: 'Segoe UI', 'Helvetica Neue', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-body: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', system-ui, -apple-system, sans-serif;
    }
    
    /* 基础reset与全局样式 */
    *, *::before, *::after {
      box-sizing: border-box;
    }
    
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.8;
      background-color: var(--bg-warm-gray);
      color: var(--text-charcoal);
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    
    h1, h2, h3, h4 {
      font-family: var(--font-heading);
      font-weight: 700;
      letter-spacing: -0.3px;
      margin-top: 0;
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: color var(--transition-base), transform var(--transition-base);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 布局容器 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }
    
    /* 导航样式 */
    .main-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: 100;
      padding: 0;
      transition: background var(--transition-base);
    }
    
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    
    .logo-area {
      display: flex;
      align-items: center;
    }
    
    .logo-text {
      font-family: var(--font-heading);
      font-size: 1.8rem;
      font-weight: 700;
      color: var(--primary-deep-green);
      letter-spacing: -0.5px;
      line-height: 1.2;
    }
    .logo-text i {
      color: var(--accent-orange);
      margin-right: 6px;
      font-size: 1.9rem;
    }
    
    .nav-links {
      display: flex;
      align-items: center;
      gap: 2rem;
      list-style: none;
      margin: 0;
    }
    
    .nav-links li a {
      font-weight: 500;
      color: var(--text-charcoal);
      padding: 0.5rem 0;
      position: relative;
      white-space: nowrap;
    }
    
    .nav-links li a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 3px;
      background: var(--primary-deep-green);
      transition: width var(--transition-base);
    }
    
    .nav-links li a:hover::after,
    .nav-links li a.active::after {
      width: 100%;
    }
    
    .mega-trigger {
      position: relative;
    }
    
    .mega-panel {
      display: none;
      position: absolute;
      top: 100%;
      right: 0;
      background: rgba(10,77,60,0.94);
      backdrop-filter: blur(8px);
      color: white;
      border-radius: 16px;
      padding: 1.5rem;
      width: 320px;
      box-shadow: 0 20px 35px rgba(0,0,0,0.3);
      margin-top: 12px;
      z-index: 120;
    }
    
    .mega-trigger:hover .mega-panel {
      display: block;
    }
    
    .mega-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 1rem;
    }
    
    .mega-card {
      background: rgba(255,255,255,0.12);
      border-radius: 10px;
      padding: 0.8rem;
      display: flex;
      align-items: center;
      gap: 0.6rem;
      transition: background 0.2s;
      cursor: pointer;
    }
    .mega-card:hover {
      background: rgba(255,255,255,0.25);
    }
    .mega-card i {
      font-size: 1.3rem;
      color: var(--accent-orange);
    }
    
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.8rem;
      color: var(--primary-deep-green);
      cursor: pointer;
    }
    
    /* Hero */
    .hero-section {
      background: linear-gradient(135deg, #0A4D3C 0%, #073B2D 100%);
      padding: 140px 0 90px;
      position: relative;
      overflow: hidden;
    }
    
    .hero-content {
      display: flex;
      align-items: center;
      gap: 3rem;
    }
    .hero-text {
      flex: 1;
      color: white;
    }
    .hero-text h1 {
      font-size: 2.8rem;
      line-height: 1.2;
      text-shadow: 0 4px 12px rgba(0,0,0,0.15);
      margin-bottom: 1.3rem;
    }
    .hero-sub {
      font-size: 1.2rem;
      color: rgba(255,255,255,0.85);
      margin-bottom: 2rem;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 36px;
      border-radius: var(--radius-button);
      font-weight: 600;
      display: inline-block;
      transition: all var(--transition-base);
      border: none;
      box-shadow: 0 6px 16px rgba(248,92,60,0.3);
    }
    .btn-primary:hover {
      background: var(--accent-orange-hover);
      transform: scale(1.05);
      box-shadow: 0 10px 24px rgba(248,92,60,0.5);
      color: white;
    }
    .hero-image {
      flex: 1;
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 30px rgba(0,0,0,0.4);
    }
    
    /* 通用板块样式 */
    .section-padding {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      margin-bottom: 1rem;
      color: var(--primary-deep-green);
    }
    .text-muted {
      color: var(--text-muted);
    }
    
    /* 痛点板块 */
    .problem-grid {
      display: flex;
      gap: 2.5rem;
      align-items: center;
    }
    .problem-text ul {
      list-style: none;
      padding: 0;
    }
    .problem-text li {
      margin-bottom: 1.2rem;
      font-size: 1.1rem;
      display: flex;
      align-items: baseline;
    }
    .problem-text li i {
      color: var(--accent-orange);
      margin-right: 10px;
    }
    
    /* 解决方案交错卡片 */
    .solution-cards {
      display: flex;
      flex-direction: column;
      gap: 2.5rem;
    }
    .solution-item {
      display: flex;
      align-items: center;
      gap: 2rem;
      background: var(--card-white);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      transition: all var(--transition-base);
      border-left: 5px solid transparent;
    }
    .solution-item:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-4px);
      border-left-color: var(--accent-orange);
    }
    .solution-item.reverse {
      flex-direction: row-reverse;
    }
    
    /* 数据成果带 */
    .stats-band {
      background: linear-gradient(120deg, #0A4D3C, #0B5E4A);
      border-radius: 24px;
      padding: 2.5rem 2rem;
      display: flex;
      justify-content: space-around;
      color: white;
    }
    .stat-number {
      font-size: 2.8rem;
      font-weight: 800;
    }
    
    /* 证言卡片 */
    .testimonial-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 2rem;
      border-left: 6px solid var(--accent-orange);
      box-shadow: var(--shadow-sm);
    }
    
    /* FAQ手风琴 */
    .accordion-faq .accordion-item {
      background: white;
      border-radius: 10px;
      margin-bottom: 0.8rem;
      border: 1px solid var(--border-light);
    }
    .accordion-title {
      font-weight: 600;
      padding: 1rem 1.5rem;
      display: flex;
      justify-content: space-between;
    }
    
    /* 最终CTA */
    .cta-full {
      background: linear-gradient(135deg, #0A4D3C, #073B2D);
      text-align: center;
      color: white;
      border-radius: 28px;
      padding: 3.5rem 2rem;
    }
    
    /* 页脚 */
    .footer-dark {
      background: #1A1A1A;
      color: #ccc;
      padding: 3rem 0;
    }
    
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .hero-content { flex-direction: column; }
      .problem-grid { flex-direction: column; }
      .solution-item, .solution-item.reverse { flex-direction: column; }
      .stats-band { flex-wrap: wrap; gap: 1.5rem; }
    }