/* roulang page: index */
/* :root 设计变量 —— 电光紫 + 能量橙 */
    :root {
      --primary: #6C3CF0;
      --primary-deep: #4A1F9E;
      --accent: #FF6B35;
      --accent-hover: #E55A2B;
      --bg-warm: #FDFBF7;
      --bg-white: #FFFFFF;
      --bg-dark-start: #2D1B69;
      --bg-dark-end: #1E1145;
      --text-dark: #2D2A3A;
      --text-mid: #6B6776;
      --text-light: #B9B5C2;
      --border-light: #E6E3EC;
      --card-shadow: 0 4px 20px rgba(0,0,0,0.04);
      --card-shadow-hover: 0 12px 40px rgba(108, 60, 240, 0.12);
      --radius-lg: 16px;
      --radius-sm: 8px;
      --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --transition: all 0.25s ease;
    }
    
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    html {
      scroll-behavior: smooth;
    }
    
    body {
      font-family: var(--font-body);
      font-size: 16px;
      line-height: 1.7;
      color: var(--text-mid);
      background-color: var(--bg-warm);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    
    /* 容器 */
    .container {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 32px;
    }
    
    @media (max-width: 768px) {
      .container {
        padding: 0 20px;
      }
    }
    
    /* 排版基础 */
    h1, h2, h3, .h1, .h2, .h3 {
      font-family: var(--font-heading);
      color: var(--text-dark);
    }
    
    h1, .h1 {
      font-size: 48px;
      line-height: 1.2;
      font-weight: 700;
      letter-spacing: -0.5px;
    }
    
    h2, .h2 {
      font-size: 36px;
      line-height: 1.3;
      font-weight: 600;
    }
    
    h3, .h3 {
      font-size: 22px;
      line-height: 1.4;
      font-weight: 600;
    }
    
    p {
      margin-bottom: 1rem;
      color: var(--text-mid);
    }
    
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 32px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      font-size: 16px;
      transition: var(--transition);
      cursor: pointer;
      border: 2px solid transparent;
      white-space: nowrap;
      font-family: var(--font-body);
    }
    
    .btn-primary {
      background: var(--accent);
      color: #fff;
      border-color: var(--accent);
    }
    
    .btn-primary:hover {
      background: var(--accent-hover);
      border-color: var(--accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 8px 20px rgba(255, 107, 53, 0.25);
    }
    
    .btn-secondary {
      background: transparent;
      color: var(--primary);
      border-color: var(--primary);
    }
    
    .btn-secondary:hover {
      background: var(--primary);
      color: #fff;
      transform: translateY(-2px);
    }
    
    .btn-ghost {
      background: transparent;
      color: #fff;
      border-color: #fff;
    }
    
    .btn-ghost:hover {
      background: #fff;
      color: var(--primary-deep);
      transform: translateY(-2px);
    }
    
    /* 导航 - 白底平台导航 */
    .site-header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(12px);
      z-index: 1000;
      border-bottom: 1px solid transparent;
      transition: var(--transition);
    }
    
    .site-header.scrolled {
      border-bottom-color: var(--border-light);
      box-shadow: 0 4px 20px rgba(0,0,0,0.04);
    }
    
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    
    .logo {
      font-family: var(--font-heading);
      font-size: 24px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.3px;
    }
    
    .logo span {
      color: var(--text-dark);
      font-weight: 400;
    }
    
    .nav-links {
      display: flex;
      gap: 32px;
      align-items: center;
    }
    
    .nav-links a {
      font-size: 15px;
      font-weight: 500;
      color: var(--text-mid);
      position: relative;
    }
    
    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
    }
    
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary);
      transition: var(--transition);
    }
    
    .nav-links a:hover::after {
      width: 100%;
    }
    
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-dark);
      cursor: pointer;
    }
    
    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 0;
        right: 0;
        width: 75%;
        height: 100vh;
        background: var(--bg-warm);
        flex-direction: column;
        justify-content: center;
        gap: 40px;
        transform: translateX(100%);
        transition: transform 0.3s ease;
        box-shadow: -8px 0 30px rgba(0,0,0,0.08);
        padding: 40px;
      }
      
      .nav-links.open {
        transform: translateX(0);
      }
      
      .menu-toggle {
        display: block;
        z-index: 1001;
      }
    }
    
    /* 区块通用 */
    section {
      padding: 100px 0;
    }
    
    @media (max-width: 768px) {
      section {
        padding: 60px 0;
      }
      h1, .h1 {
        font-size: 32px;
      }
      h2, .h2 {
        font-size: 26px;
      }
      h3, .h3 {
        font-size: 20px;
      }
    }
    
    /* Hero 双栏布局 */
    .hero-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    
    .hero-text {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    
    .hero-buttons {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-top: 8px;
    }
    
    .hero-visual {
      position: relative;
    }
    
    .organic-shape {
      width: 100%;
      padding-bottom: 90%;
      background: radial-gradient(circle at 30% 30%, rgba(108,60,240,0.25), rgba(74,31,158,0.6));
      border-radius: 40% 60% 55% 45% / 45% 50% 50% 55%;
      overflow: hidden;
      position: relative;
      box-shadow: 0 25px 50px -12px rgba(108, 60, 240, 0.25);
    }
    
    .organic-shape img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      mix-blend-mode: overlay;
      opacity: 0.9;
    }
    
    @media (max-width: 768px) {
      .hero-grid {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .organic-shape {
        padding-bottom: 75%;
      }
    }
    
    /* 痛点/方案网格 */
    .pain-solution-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: start;
    }
    
    .pain-item {
      display: flex;
      gap: 18px;
      margin-bottom: 32px;
      padding-left: 16px;
      border-left: 4px solid var(--primary);
      background: #F4F1FA;
      padding: 20px 20px 20px 24px;
      border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }
    
    .solution-item {
      display: flex;
      gap: 18px;
      background: #fff;
      padding: 20px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      margin-bottom: 24px;
      align-items: flex-start;
    }
    
    .solution-icon {
      color: var(--accent);
      font-size: 24px;
      margin-top: 4px;
    }
    
    @media (max-width: 768px) {
      .pain-solution-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 数据卡片 */
    .stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    
    .stat-card {
      background: #fff;
      padding: 32px 24px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: var(--transition);
    }
    
    .stat-card:hover {
      box-shadow: var(--card-shadow-hover);
      transform: translateY(-4px);
    }
    
    .stat-number {
      font-size: 44px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.1;
      margin-bottom: 8px;
    }
    
    @media (max-width: 1024px) {
      .stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 520px) {
      .stats-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 证言卡片 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    
    .testimonial-card {
      background: #fff;
      padding: 32px;
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    
    .testimonial-card:hover {
      box-shadow: var(--card-shadow-hover);
    }
    
    .testimonial-avatar {
      width: 56px;
      height: 56px;
      border-radius: 50%;
      overflow: hidden;
      background: #eee;
    }
    
    .testimonial-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    
    .testimonial-quote {
      font-style: italic;
      color: var(--text-dark);
      font-size: 15px;
      line-height: 1.6;
    }
    
    @media (max-width: 1024px) {
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    
    @media (max-width: 600px) {
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* FAQ 手风琴 */
    .faq-list {
      max-width: 800px;
      margin: 0 auto;
    }
    
    .faq-item {
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 12px;
    }
    
    .faq-question {
      width: 100%;
      background: none;
      border: none;
      padding: 20px 16px;
      font-size: 18px;
      font-weight: 600;
      color: var(--text-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-family: var(--font-heading);
    }
    
    .faq-icon {
      font-size: 22px;
      color: var(--primary);
      transition: transform 0.3s;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease;
      padding: 0 16px;
      background: #F9F7FC;
      margin: 0 8px 8px;
      border-radius: var(--radius-sm);
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px;
    }
    
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
      color: var(--accent);
    }
    
    /* CTA 深色区块 */
    .cta-section {
      background: linear-gradient(135deg, var(--bg-dark-start), var(--bg-dark-end));
      color: #fff;
    }
    
    .cta-content {
      text-align: center;
      max-width: 700px;
      margin: 0 auto;
    }
    
    .cta-content h2 {
      color: #fff;
    }
    
    .cta-content p {
      color: rgba(255,255,255,0.75);
      margin: 16px 0 28px;
    }
    
    /* 页脚 */
    .site-footer {
      background: #2D2A3A;
      color: #B9B5C2;
      padding: 60px 0 30px;
    }
    
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    
    .footer-logo {
      font-size: 22px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 12px;
    }
    
    .social-icons {
      display: flex;
      gap: 16px;
      margin-top: 16px;
    }
    
    .social-icons a {
      color: #B9B5C2;
      font-size: 20px;
    }
    
    .social-icons a:hover {
      color: var(--accent);
    }
    
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.1);
      padding-top: 24px;
      text-align: center;
      font-size: 14px;
    }
    
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 工具类 */
    .text-center { text-align: center; }
    .mb-2 { margin-bottom: 0.5rem; }
    .mb-4 { margin-bottom: 1.5rem; }
    .mt-3 { margin-top: 1rem; }