/* roulang page: index */
:root {
      --primary-green: #0A8F3C;
      --primary-green-hover: #067A30;
      --dark-charcoal: #1E1E1E;
      --neon-yellow: #C8FF00;
      --neon-yellow-light: #DDFF4D;
      --bg-light: #F5F6FA;
      --white: #FFFFFF;
      --text-dark: #1E1E1E;
      --text-body: #4A4A4A;
      --text-muted: #7A7A7A;
      --border-light: #E0E0E0;
      --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
      --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
      --radius-card: 12px;
      --radius-btn: 8px;
      --transition-base: 0.25s ease;
    }
    * {
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
      background-color: var(--white);
      color: var(--text-body);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 1.5rem;
    }
    /* 导航 */
    .site-header {
      background-color: var(--dark-charcoal);
      position: sticky;
      top: 0;
      z-index: 100;
      height: 64px;
      display: flex;
      align-items: center;
      box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
      letter-spacing: 1px;
      white-space: nowrap;
    }
    .logo span {
      color: var(--neon-yellow);
    }
    .nav-links {
      display: flex;
      gap: 2rem;
      align-items: center;
    }
    .nav-links a {
      color: #ccc;
      font-size: 0.95rem;
      font-weight: 500;
      transition: color 0.2s;
      position: relative;
      padding-bottom: 4px;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: white;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-green);
      transition: width 0.25s;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    .right-actions {
      display: flex;
      align-items: center;
      gap: 1.25rem;
    }
    .search-icon {
      color: white;
      font-size: 1.2rem;
      cursor: pointer;
    }
    .btn-primary-outline {
      border: 2px solid var(--primary-green);
      background: transparent;
      color: white;
      padding: 0.5rem 1.4rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      transition: var(--transition-base);
    }
    .btn-primary-outline:hover {
      background: var(--primary-green);
      color: white;
    }
    .mobile-toggle {
      display: none;
      color: white;
      font-size: 2rem;
      cursor: pointer;
    }
    /* 按钮系统 */
    .btn {
      display: inline-block;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      font-weight: 600;
      text-align: center;
      transition: var(--transition-base);
      cursor: pointer;
      border: none;
      font-size: 1rem;
    }
    .btn-primary {
      background: var(--primary-green);
      color: white;
    }
    .btn-primary:hover {
      background: var(--primary-green-hover);
      color: white;
    }
    .btn-outline {
      border: 2px solid var(--primary-green);
      background: transparent;
      color: var(--primary-green);
    }
    .btn-outline:hover {
      background: var(--primary-green);
      color: white;
    }
    .btn-highlight {
      background: var(--neon-yellow);
      color: var(--dark-charcoal);
      font-weight: 700;
    }
    .btn-highlight:hover {
      background: var(--neon-yellow-light);
      color: #000;
    }
    /* Hero */
    #hero {
      background: linear-gradient(90deg, rgba(30,30,30,0.75) 0%, rgba(30,30,30,0.4) 70%), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      min-height: 70vh;
      display: flex;
      align-items: center;
      color: white;
    }
    .hero-content {
      max-width: 600px;
      text-align: left;
    }
    .hero-content h1 {
      font-size: 2.5rem;
      font-weight: 700;
      color: white;
      margin-bottom: 1.2rem;
    }
    .hero-content p {
      font-size: 1.2rem;
      margin-bottom: 2rem;
      color: rgba(255,255,255,0.9);
    }
    .hero-btns {
      display: flex;
      gap: 1rem;
      flex-wrap: wrap;
    }
    /* 通用区块 */
    section {
      padding: 80px 0;
    }
    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--dark-charcoal);
      margin-bottom: 1rem;
    }
    .section-sub {
      color: var(--text-muted);
      margin-bottom: 3rem;
    }
    .bg-light {
      background-color: var(--bg-light);
    }
    /* 痛点 */
    .pain-row {
      display: flex;
      flex-wrap: wrap;
      gap: 40px;
      align-items: center;
      margin-bottom: 40px;
    }
    .pain-text h3 {
      font-weight: 700;
      color: var(--dark-charcoal);
    }
    /* 解决方案 2+1 */
    .solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      align-items: start;
    }
    .solution-card {
      background: white;
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-sm);
      overflow: hidden;
      transition: var(--transition-base);
      display: flex;
      flex-direction: column;
    }
    .solution-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-4px);
    }
    .solution-card img {
      height: 180px;
      object-fit: cover;
      width: 100%;
    }
    .solution-card-body {
      padding: 1.5rem;
    }
    .solution-card.wide {
      grid-column: span 2;
      max-width: 66%;
      justify-self: center;
    }
    /* 数据 proof */
    .stats-grid {
      display: flex;
      justify-content: space-around;
      flex-wrap: wrap;
      gap: 2rem;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-size: 3rem;
      font-weight: 800;
      color: var(--neon-yellow);
      background: var(--dark-charcoal);
      display: inline-block;
      padding: 0.25rem 1.5rem;
      border-radius: 8px;
    }
    /* 证言 */
    .testimonial-cards {
      display: flex;
      gap: 24px;
      flex-wrap: wrap;
    }
    .testimonial-card {
      background: white;
      border-left: 4px solid var(--primary-green);
      border-radius: var(--radius-card);
      padding: 1.8rem;
      box-shadow: var(--shadow-sm);
      flex: 1 1 280px;
    }
    /* FAQ */
    .accordion-item {
      background: white;
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 4px;
    }
    .accordion-header {
      padding: 1rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: white;
      transition: background 0.3s;
    }
    .accordion-header.active {
      background: #F0FAF3;
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #F0FAF3;
      padding: 0 1.5rem;
    }
    .accordion-content p {
      padding: 1rem 0;
      color: var(--text-body);
    }
    /* CTA */
    #cta {
      background: var(--dark-charcoal);
      color: white;
    }
    /* Footer */
    .site-footer {
      background: var(--dark-charcoal);
      color: #B0B0B0;
      padding: 3rem 0;
    }
    .footer-grid {
      display: flex;
      justify-content: space-between;
      gap: 2rem;
      flex-wrap: wrap;
    }
    .footer-col a {
      color: #B0B0B0;
      display: block;
      margin-bottom: 0.4rem;
    }
    .footer-col a:hover {
      color: var(--primary-green);
    }
    @media (max-width: 1024px) {
      .solution-card.wide {
        max-width: 100%;
      }
    }
    @media (max-width: 768px) {
      .nav-links, .right-actions .search-icon, .right-actions .btn-primary-outline {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      #hero {
        min-height: 60vh;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .solution-grid {
        grid-template-columns: 1fr;
      }
      .solution-card.wide {
        grid-column: span 1;
        max-width: 100%;
      }
    }
    .mobile-menu {
      display: none;
      position: fixed;
      top: 64px;
      left: 0;
      width: 100%;
      background: var(--dark-charcoal);
      flex-direction: column;
      padding: 2rem;
      z-index: 99;
    }
    .mobile-menu a {
      color: white;
      padding: 0.8rem 0;
      border-bottom: 1px solid #444;
    }
    .show-menu {
      display: flex;
    }