/* roulang page: index */
:root {
      --primary-deep: #0D4C4A;
      --accent-orange: #F27A33;
      --bg-light: #F8F9FA;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-secondary: #5F6B7A;
      --success-green: #2D9F4B;
      --border-light: rgba(0,0,0,0.05);
      --shadow-card: 0 4px 20px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 30px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --font-stack: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --transition: all 0.2s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-stack);
      background: var(--bg-light);
      color: var(--text-dark);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    /* 透明玻璃导航 */
    .glass-nav {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0.75);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      transition: var(--transition);
      padding: 0 24px;
    }
    .glass-nav.scrolled {
      background: rgba(255,255,255,0.98);
      box-shadow: 0 2px 12px rgba(0,0,0,0.06);
      backdrop-filter: none;
      -webkit-backdrop-filter: none;
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      max-width: 1200px;
      margin: 0 auto;
    }
    .logo {
      font-size: 22px;
      font-weight: 700;
      color: var(--primary-deep);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
    }
    .logo i {
      font-size: 26px;
      color: var(--accent-orange);
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 32px;
    }
    .nav-links a {
      color: var(--primary-deep);
      text-decoration: none;
      font-weight: 500;
      font-size: 16px;
      position: relative;
      transition: color 0.2s;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent-orange);
      transition: width 0.2s;
    }
    .nav-links a:hover {
      color: var(--accent-orange);
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .btn-nav-cta {
      background: var(--accent-orange);
      color: white;
      padding: 10px 22px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 15px;
      text-decoration: none;
      transition: var(--transition);
      border: none;
      cursor: pointer;
    }
    .btn-nav-cta:hover {
      background: #E0692A;
      transform: scale(1.03);
    }
    .hamburger {
      display: none;
      font-size: 26px;
      color: var(--primary-deep);
      cursor: pointer;
      background: none;
      border: none;
    }
    /* Hero */
    .hero {
      min-height: 90vh;
      display: flex;
      align-items: center;
      background: linear-gradient(135deg, rgba(13,76,74,0.75) 0%, rgba(13,76,74,0.4) 100%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      color: white;
      position: relative;
      margin-top: 0;
    }
    .hero-content {
      max-width: 800px;
      padding: 120px 0 80px;
    }
    .hero h1 {
      font-size: 48px;
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 20px;
      text-shadow: 0 4px 12px rgba(0,0,0,0.2);
    }
    .hero .subtitle {
      font-size: 20px;
      margin-bottom: 36px;
      opacity: 0.9;
    }
    .btn-primary {
      background: var(--accent-orange);
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      text-decoration: none;
      display: inline-block;
      transition: var(--transition);
      border: none;
      margin-right: 16px;
    }
    .btn-primary:hover {
      background: #E0692A;
      transform: scale(1.03);
    }
    .btn-secondary {
      background: transparent;
      border: 2px solid white;
      color: white;
      padding: 14px 32px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 18px;
      text-decoration: none;
      transition: var(--transition);
    }
    .btn-secondary:hover {
      background: white;
      color: var(--primary-deep);
    }
    /* 板块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }
    .section-desc {
      font-size: 18px;
      color: var(--text-secondary);
      max-width: 700px;
      margin-bottom: 48px;
    }
    /* 痛点卡片 */
    .pain-grid {
      display: grid;
      grid-template-columns: repeat(3,1fr);
      gap: 30px;
    }
    .pain-card {
      background: #f0f2f5;
      border-radius: var(--radius-card);
      padding: 32px;
      transition: var(--transition);
      border-left: 4px solid transparent;
    }
    .pain-card:hover {
      border-left-color: var(--accent-orange);
      background: white;
      box-shadow: var(--shadow-card);
    }
    .pain-icon {
      width: 56px;
      height: 56px;
      background: var(--primary-deep);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 24px;
      margin-bottom: 20px;
    }
    /* 解决方案非对称 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 30px;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      padding: 32px;
      box-shadow: var(--shadow-card);
      transition: var(--transition);
    }
    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .solution-card i {
      font-size: 32px;
      color: var(--accent-orange);
      margin-bottom: 20px;
    }
    .results-stats {
      display: flex;
      justify-content: space-between;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .stat-item {
      text-align: center;
      flex:1;
    }
    .stat-number {
      font-size: 48px;
      font-weight: 700;
      color: var(--accent-orange);
    }
    .testimonial-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
    }
    .testimonial-card {
      background: #f0f2f5;
      padding: 32px;
      border-radius: var(--radius-card);
      position: relative;
    }
    .testimonial-card .quote-icon {
      font-size: 40px;
      color: var(--primary-deep);
      opacity: 0.3;
    }
    .faq-item {
      border-bottom: 1px solid #e0e0e0;
      padding: 16px 0;
      cursor: pointer;
    }
    .faq-question {
      font-weight: 600;
      font-size: 18px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      margin-top: 12px;
    }
    .cta-section {
      background: var(--primary-deep);
      color: white;
      text-align: center;
      background-image: radial-gradient(circle at 20% 50%, rgba(255,255,255,0.05) 0%, transparent 60%);
    }
    footer {
      background: #1E1E1E;
      color: #ccc;
      padding: 60px 0 30px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
    }
    @media (max-width: 1024px) {
      .pain-grid, .solution-grid { grid-template-columns: 1fr 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .hamburger { display: block; }
      .mobile-menu {
        display: none;
        flex-direction: column;
        background: white;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
      }
      .mobile-menu.open { display: flex; }
      .hero h1 { font-size: 32px; }
      .pain-grid, .solution-grid, .testimonial-grid { grid-template-columns: 1fr; }
      .results-stats { flex-direction: column; gap: 24px; }
    }