/* roulang page: index */
/* :root 设计变量 */
    :root {
      --bg-deep-purple: #0B0C1E;
      --bg-gradient-end: #1A1F3A;
      --purple-electric: #7B2FBE;
      --purple-light: #A855F7;
      --cyan-neon: #00F0FF;
      --text-primary: #FFFFFF;
      --text-secondary: #B0B8D0;
      --text-muted: #6B7394;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --card-radius-lg: 16px;
      --card-radius-md: 12px;
      --btn-radius: 50px;
      --shadow-dark: 0 8px 32px rgba(0, 0, 0, 0.4);
      --shadow-hover: 0 16px 48px rgba(0, 0, 0, 0.6), 0 0 0 1px rgba(0, 240, 255, 0.3);
      --font-head: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    
    body {
      font-family: var(--font-head);
      background: linear-gradient(145deg, var(--bg-deep-purple) 0%, var(--bg-gradient-end) 100%);
      color: var(--text-primary);
      line-height: 1.7;
      font-size: 16px;
      -webkit-font-smoothing: antialiased;
      scroll-behavior: smooth;
    }
    
    /* 全局容器 */
    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }
    
    @media (min-width: 640px) {
      .container {
        padding: 0 48px;
      }
    }
    
    /* 玻璃拟态卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius-lg);
      box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.05), var(--shadow-dark);
      transition: all 0.3s ease;
    }
    
    .glass-card:hover {
      box-shadow: var(--shadow-hover);
      transform: translateY(-2px);
    }
    
    /* 按钮样式 */
    .btn-primary {
      background: linear-gradient(135deg, var(--purple-electric), var(--purple-light));
      color: white;
      font-weight: 600;
      border: none;
      border-radius: var(--btn-radius);
      padding: 12px 28px;
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      text-decoration: none;
      line-height: 1.2;
      min-width: 44px;
      min-height: 44px;
    }
    
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0, 240, 255, 0.8);
      transform: translateY(-2px);
      color: white;
      text-decoration: none;
    }
    
    .btn-outline {
      background: transparent;
      border: 1px solid var(--cyan-neon);
      color: var(--cyan-neon);
      font-weight: 600;
      border-radius: var(--btn-radius);
      padding: 12px 28px;
      transition: all 0.3s ease;
      display: inline-block;
      text-align: center;
      cursor: pointer;
      text-decoration: none;
      line-height: 1.2;
      min-width: 44px;
      min-height: 44px;
    }
    
    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.1);
      color: var(--cyan-neon);
      text-decoration: none;
    }
    
    /* 标题层级 */
    h1, h2, h3 {
      font-family: var(--font-head);
      font-weight: 700;
      margin-bottom: 0.5rem;
    }
    
    h1 {
      font-size: 48px;
      line-height: 56px;
    }
    
    h2 {
      font-size: 36px;
      line-height: 44px;
    }
    
    h3 {
      font-size: 20px;
      line-height: 28px;
    }
    
    @media (max-width: 640px) {
      h1 {
        font-size: 32px;
        line-height: 40px;
      }
      h2 {
        font-size: 24px;
        line-height: 32px;
      }
    }
    
    /* 段落间距 */
    p {
      margin-bottom: 1.5rem;
      color: var(--text-secondary);
    }
    
    .text-cyan {
      color: var(--cyan-neon);
    }
    
    .text-muted {
      color: var(--text-muted);
    }
    
    /* 导航分屏布局 */
    .hero-split {
      display: flex;
      min-height: 100vh;
      position: relative;
    }
    
    .nav-side {
      width: 40%;
      background: rgba(11, 12, 30, 0.9);
      display: flex;
      flex-direction: column;
      justify-content: center;
      padding: 40px;
      position: relative;
      z-index: 2;
    }
    
    .visual-side {
      width: 60%;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    
    .visual-side::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(135deg, rgba(11,12,30,0.7) 0%, rgba(26,31,58,0.5) 100%);
    }
    
    .visual-content {
      position: relative;
      z-index: 3;
      text-align: left;
      padding: 40px;
      width: 100%;
    }
    
    .nav-links {
      list-style: none;
      margin: 2rem 0;
    }
    
    .nav-links li {
      margin-bottom: 1.2rem;
    }
    
    .nav-links a {
      color: var(--text-secondary);
      text-decoration: none;
      font-size: 18px;
      font-weight: 500;
      transition: all 0.3s ease;
      display: inline-block;
      position: relative;
    }
    
    .nav-links a:hover {
      color: var(--cyan-neon);
      transform: translateX(4px);
    }
    
    .logo-text {
      font-size: 28px;
      font-weight: 700;
      color: white;
      letter-spacing: 2px;
    }
    
    .logo-text i {
      color: var(--cyan-neon);
      margin-right: 8px;
    }
    
    /* 移动端导航 */
    .mobile-header {
      display: none;
    }
    
    @media (max-width: 1024px) {
      .hero-split {
        flex-direction: column;
      }
      .nav-side {
        display: none;
      }
      .visual-side {
        width: 100%;
        height: 60vh;
      }
      .mobile-header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 16px 24px;
        background: rgba(11, 12, 30, 0.95);
        position: fixed;
        top: 0;
        width: 100%;
        z-index: 20;
        backdrop-filter: blur(8px);
      }
      .hamburger {
        font-size: 24px;
        color: white;
        cursor: pointer;
      }
      .mobile-nav {
        display: none;
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        background: rgba(11, 12, 30, 0.98);
        padding: 20px;
        z-index: 19;
      }
      .mobile-nav.active {
        display: block;
      }
      .mobile-nav a {
        display: block;
        padding: 12px;
        color: var(--text-secondary);
        border-bottom: 1px solid rgba(255,255,255,0.1);
      }
    }
    
    /* 板块间距 */
    section {
      padding: 120px 0;
    }
    
    @media (max-width: 1024px) {
      section {
        padding: 80px 0;
      }
    }
    
    @media (max-width: 640px) {
      section {
        padding: 60px 0;
      }
    }
    
    /* 非对称能力区 */
    .capability-row {
      display: flex;
      align-items: center;
      margin-bottom: 80px;
      gap: 40px;
    }
    
    .capability-row.reverse {
      flex-direction: row-reverse;
    }
    
    .capability-text {
      flex: 1;
    }
    
    .capability-img {
      flex: 1;
      border-radius: var(--card-radius-md);
      overflow: hidden;
      border: 1px solid var(--glass-border);
      box-shadow: 0 8px 20px rgba(0,0,0,0.5);
    }
    
    .capability-img img {
      width: 100%;
      display: block;
      transition: transform 0.3s;
    }
    
    .capability-img:hover img {
      transform: scale(1.02);
    }
    
    @media (max-width: 640px) {
      .capability-row, .capability-row.reverse {
        flex-direction: column;
      }
    }
    
    /* 数据数字 */
    .stat-number {
      font-family: var(--font-mono);
      font-weight: 600;
      color: var(--cyan-neon);
      font-size: 48px;
      line-height: 1.2;
    }
    
    /* FAQ手风琴 */
    .faq-item {
      border-bottom: 1px solid var(--glass-border);
      padding: 20px 0;
      cursor: pointer;
    }
    
    .faq-question {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
    }
    
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
      margin-top: 10px;
    }
    
    .faq-item.active .faq-answer {
      max-height: 200px;
    }
    
    .faq-icon {
      color: var(--cyan-neon);
      font-size: 20px;
      transition: transform 0.3s;
    }
    
    /* 证言区浅色背景 */
    .testimonial-section {
      background: #F8FAFC;
      color: #1a1a2e;
    }
    
    .testimonial-card {
      background: rgba(0,0,0,0.02);
      border-radius: var(--card-radius-lg);
      padding: 24px;
      border: 1px solid rgba(0,0,0,0.05);
    }
    
    /* 页脚 */
    footer {
      background: #0B0C1E;
      padding: 40px 0;
      color: var(--text-secondary);
    }