/* roulang page: index */
/* :root 设计变量 */
    :root {
      --primary: #E94057;
      --primary-dark: #D13047;
      --secondary: #1E1E2E;
      --accent: #00C9A7;
      --bg-white: #FFFFFF;
      --bg-light: #F5F5F7;
      --text-main: #1E1E2E;
      --text-secondary: #6B7280;
      --text-disabled: #9CA3AF;
      --border-light: #E5E7EB;
      --radius-sm: 6px;
      --radius-md: 8px;
      --radius-lg: 12px;
      --radius-xl: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 25px rgba(0,0,0,0.12);
      --font-body: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-number: 'Inter', 'SF Pro Display', sans-serif;
      --max-width: 1200px;
    }
    
    /* Reset & Base */
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      font-family: var(--font-body);
      color: var(--text-main);
      background: var(--bg-white);
      margin: 0;
      padding: 0;
      line-height: 1.7;
      font-weight: 400;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    h1, h2, h3, h4 {
      margin: 0;
      font-weight: 700;
    }
    
    /* 覆盖 Foundation 默认样式 */
    .grid-container {
      max-width: var(--max-width);
      padding-left: 24px;
      padding-right: 24px;
    }
    .button {
      font-family: var(--font-body);
      border-radius: var(--radius-sm);
      font-weight: 600;
      padding: 14px 32px;
      transition: all 0.2s ease;
      display: inline-block;
      text-align: center;
      line-height: 1.2;
      cursor: pointer;
      border: 2px solid transparent;
      background: transparent;
      color: var(--primary);
    }
    .button.primary {
      background: var(--primary);
      color: white;
      border-color: var(--primary);
    }
    .button.primary:hover {
      background: var(--primary-dark);
      border-color: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-hover);
    }
    .button.secondary {
      background: transparent;
      color: var(--primary);
      border: 2px solid var(--primary);
    }
    .button.secondary:hover {
      background: rgba(233,64,87,0.1);
      transform: translateY(-2px);
    }
    .button.link {
      background: transparent;
      border: none;
      color: var(--primary);
      padding: 10px 0;
      text-decoration: underline;
      text-underline-offset: 4px;
    }
    
    /* 导航栏 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 100;
      background: rgba(255,255,255,0);
      transition: background 0.25s ease, box-shadow 0.25s ease;
      height: 72px;
      display: flex;
      align-items: center;
    }
    .site-header.scrolled {
      background: rgba(255,255,255,0.95);
      backdrop-filter: blur(10px);
      box-shadow: 0 2px 10px rgba(0,0,0,0.08);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
    }
    .logo {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .logo-icon {
      width: 32px;
      height: 32px;
      background: var(--primary);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-weight: 900;
      font-size: 18px;
      line-height: 1;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      border-bottom: 2px solid transparent;
      transition: color 0.2s, border-color 0.2s;
    }
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      border-bottom-color: var(--primary);
    }
    .nav-cta {
      background: var(--primary);
      color: white !important;
      padding: 10px 24px !important;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 14px;
      border: none !important;
    }
    .nav-cta:hover {
      background: var(--primary-dark);
      color: white !important;
    }
    
    /* 移动端汉堡菜单 */
    .menu-icon {
      display: none;
      cursor: pointer;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      padding: 8px;
    }
    .menu-icon span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--secondary);
      transition: 0.3s;
    }
    
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    .section-title {
      font-size: 40px;
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 16px;
      text-align: center;
      color: var(--secondary);
    }
    .section-subtitle {
      font-size: 18px;
      color: var(--text-secondary);
      text-align: center;
      max-width: 680px;
      margin: 0 auto 48px;
    }
    
    /* Hero */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background: #F8F9FA;
      padding-top: 72px;
      overflow: hidden;
    }
    .hero-grid {
      display: flex;
      align-items: center;
      gap: 60px;
    }
    .hero-left {
      flex: 0 0 60%;
    }
    .hero-right {
      flex: 0 0 40%;
      animation: fadeInRight 0.8s ease-out;
    }
    @keyframes fadeInRight {
      from { opacity: 0; transform: translateX(20px); }
      to { opacity: 1; transform: translateX(0); }
    }
    .hero-title {
      font-size: 56px;
      font-weight: 800;
      line-height: 1.1;
      margin-bottom: 20px;
      color: var(--secondary);
    }
    .hero-title span {
      color: var(--primary);
      text-decoration: underline;
      text-decoration-thickness: 3px;
      text-underline-offset: 8px;
    }
    .hero-sub {
      font-size: 20px;
      color: var(--text-secondary);
      margin-bottom: 36px;
      line-height: 1.6;
    }
    .hero-actions {
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .hero-img {
      border-radius: var(--radius-xl);
      box-shadow: 0 20px 40px rgba(0,0,0,0.15);
      animation: float 4s ease-in-out infinite;
    }
    @keyframes float {
      0%,100% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
    }
    
    /* 价值主张 */
    .value-cards {
      display: flex;
      gap: 32px;
    }
    .value-card {
      flex: 1;
      background: transparent;
      padding: 0;
      display: flex;
      gap: 20px;
      align-items: flex-start;
      border-right: 1px solid var(--border-light);
      padding-right: 32px;
    }
    .value-card:last-child {
      border-right: none;
    }
    .value-line {
      width: 4px;
      height: 60px;
      border-radius: 2px;
      flex-shrink: 0;
      margin-top: 6px;
    }
    .value-line.red { background: var(--primary); }
    .value-line.dark { background: var(--secondary); }
    .value-line.green { background: var(--accent); }
    .value-content h3 {
      font-size: 24px;
      font-weight: 600;
      margin-bottom: 10px;
    }
    .value-content p {
      color: var(--text-secondary);
      font-size: 16px;
      line-height: 1.6;
    }
    
    /* 功能分组 */
    .feature-row {
      display: flex;
      align-items: center;
      gap: 80px;
      margin-bottom: 100px;
    }
    .feature-row:last-child {
      margin-bottom: 0;
    }
    .feature-text {
      flex: 1;
    }
    .feature-img {
      flex: 1;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .feature-img:hover {
      transform: scale(1.02);
      box-shadow: var(--shadow-hover);
    }
    .feature-list {
      list-style: none;
      padding: 0;
      margin: 16px 0 0;
    }
    .feature-list li {
      position: relative;
      padding-left: 22px;
      margin-bottom: 10px;
      color: var(--text-secondary);
    }
    .feature-list li::before {
      content: '';
      position: absolute;
      left: 0;
      top: 8px;
      width: 8px;
      height: 8px;
      background: var(--primary);
      border-radius: 50%;
    }
    
    /* 使用场景 */
    .scenario-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scrollbar-width: thin;
      scrollbar-color: var(--primary) #eee;
    }
    .scenario-scroll::-webkit-scrollbar {
      height: 6px;
    }
    .scenario-scroll::-webkit-scrollbar-thumb {
      background: var(--primary);
      border-radius: 10px;
    }
    .scenario-card {
      min-width: 280px;
      background: white;
      border-radius: var(--radius-lg);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      flex-shrink: 0;
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }
    .scenario-card img {
      height: 180px;
      object-fit: cover;
      border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    }
    .scenario-text {
      padding: 20px;
    }
    
    /* 案例 */
    .stats-row {
      display: flex;
      justify-content: center;
      gap: 80px;
      margin-bottom: 60px;
    }
    .stat-item {
      text-align: center;
    }
    .stat-number {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 900;
      color: var(--accent);
      line-height: 1;
    }
    .case-cards {
      display: flex;
      gap: 32px;
    }
    .case-card {
      flex: 1;
      background: white;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      gap: 20px;
      align-items: center;
    }
    .case-avatar {
      width: 80px;
      height: 80px;
      border-radius: 50%;
      background: #eee;
      flex-shrink: 0;
    }
    
    /* 价格 */
    .pricing-grid {
      display: flex;
      align-items: center;
      gap: 32px;
      justify-content: center;
    }
    .pricing-card {
      background: white;
      border-radius: var(--radius-xl);
      box-shadow: var(--shadow-sm);
      padding: 40px 32px;
      flex: 1;
      max-width: 340px;
      position: relative;
      border: 2px solid transparent;
    }
    .pricing-card.featured {
      border-color: var(--primary);
      transform: scale(1.03);
      box-shadow: var(--shadow-hover);
    }
    .popular-badge {
      position: absolute;
      top: -12px;
      right: 24px;
      background: var(--primary);
      color: white;
      font-size: 12px;
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 600;
    }
    .price {
      font-family: var(--font-number);
      font-size: 48px;
      font-weight: 900;
      color: var(--secondary);
      margin: 16px 0;
    }
    
    /* FAQ */
    .accordion-item {
      border-bottom: 1px solid var(--border-light);
    }
    .accordion-title {
      font-size: 18px;
      font-weight: 600;
      padding: 20px 0;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .accordion-title::after {
      content: '+';
      font-size: 24px;
      transition: transform 0.3s ease;
    }
    .accordion-item.active .accordion-title::after {
      transform: rotate(45deg);
    }
    .accordion-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      padding-right: 20px;
    }
    
    /* CTA 横幅 */
    .cta-banner {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      padding: 80px 0;
      text-align: center;
      color: white;
    }
    
    /* 页脚 */
    .site-footer {
      background: var(--secondary);
      color: var(--text-disabled);
      padding: 60px 0 20px;
    }
    .footer-grid {
      display: flex;
      gap: 40px;
    }
    .footer-col {
      flex: 1;
    }
    .copyright {
      border-top: 1px solid rgba(255,255,255,0.1);
      margin-top: 40px;
      padding-top: 20px;
      font-size: 13px;
      text-align: center;
    }
    
    /* 响应式 */
    @media (max-width: 1024px) {
      .hero-title { font-size: 42px; }
      .hero-grid { flex-direction: column; }
      .hero-left, .hero-right { flex: auto; width: 100%; }
      .feature-row { flex-direction: column; gap: 32px; }
      .pricing-grid { flex-direction: column; align-items: center; }
      .pricing-card.featured { transform: none; }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .menu-icon { display: flex; }
      .value-cards { flex-direction: column; }
      .value-card { border-right: none; border-bottom: 1px solid var(--border-light); padding-bottom: 24px; }
      .stats-row { flex-wrap: wrap; gap: 40px; }
      .case-cards { flex-direction: column; }
    }
    @media (max-width: 520px) {
      section { padding: 60px 0; }
      .hero-title { font-size: 36px; }
    }