/* roulang page: index */
/* ----- 设计变量 ----- */
    :root {
      --bg-deep: #0A0E27;
      --cyan: #00F0FF;
      --purple: #B44AFF;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(0, 240, 255, 0.15);
      --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.4);
      --glow-purple: 0 0 25px rgba(180, 74, 255, 0.5);
      --text-primary: #F0F4FF;
      --text-secondary: #A8B8D0;
      --text-muted: #6A7A99;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
      --font-display: 'Bebas Neue', 'DIN Alternate', 'PingFang SC', sans-serif;
      --max-width: 1280px;
      --radius-card: 16px;
      --radius-btn: 8px;
      --radius-img: 12px;
      --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    }
    
    /* ----- 基础重置 ----- */
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }
    body {
      background-color: var(--bg-deep);
      color: var(--text-primary);
      font-family: var(--font-sans);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    button, .btn {
      cursor: pointer;
      font-family: inherit;
      border: none;
      background: none;
      transition: all 0.3s ease;
    }
    
    /* 容器与栅格 */
    .container {
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    @media (max-width: 768px) {
      .container {
        padding: 0 16px;
      }
    }
    
    /* ----- 导航 PC 固定顶部玻璃拟态 ----- */
    #header {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      background: rgba(10, 14, 39, 0.75);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border-bottom: 1px solid var(--glass-border);
      padding: 0 24px;
    }
    .nav-container {
      max-width: var(--max-width);
      margin: 0 auto;
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }
    .logo {
      font-size: 1.8rem;
      font-weight: 800;
      letter-spacing: 1px;
      background: linear-gradient(135deg, var(--cyan), #7BECFF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo i {
      background: none;
      -webkit-text-fill-color: var(--cyan);
      font-size: 2rem;
      text-shadow: var(--glow-cyan);
    }
    .nav-links {
      display: flex;
      gap: 2.5rem;
      font-weight: 500;
      color: var(--text-secondary);
    }
    .nav-links a {
      position: relative;
      padding: 8px 0;
      font-size: 0.95rem;
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--cyan);
      box-shadow: 0 0 10px var(--cyan);
      transition: width 0.3s ease;
    }
    .nav-links a:hover {
      color: #fff;
    }
    .nav-links a:hover::after {
      width: 100%;
    }
    
    /* 移动端底部胶囊导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: calc(100% - 48px);
      max-width: 420px;
      background: rgba(10, 14, 39, 0.8);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border: 1px solid var(--glass-border);
      border-radius: 60px;
      padding: 8px 16px;
      z-index: 1001;
      box-shadow: 0 10px 30px rgba(0,0,0,0.7);
    }
    .mobile-nav-inner {
      display: flex;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-nav-item {
      display: flex;
      flex-direction: column;
      align-items: center;
      color: var(--text-muted);
      font-size: 0.7rem;
      gap: 2px;
      padding: 6px 12px;
      border-radius: 30px;
      transition: all 0.2s ease;
    }
    .mobile-nav-item i {
      font-size: 1.3rem;
    }
    .mobile-nav-item.active, .mobile-nav-item:hover {
      color: var(--cyan);
      text-shadow: 0 0 12px var(--cyan);
      background: rgba(0,240,255,0.08);
    }
    
    @media (max-width: 768px) {
      #header .nav-links {
        display: none;
      }
      .mobile-bottom-nav {
        display: block;
      }
      .nav-container {
        justify-content: center;
      }
      .logo {
        font-size: 1.6rem;
      }
    }
    
    /* ----- 板块通用样式 ----- */
    section {
      padding: 100px 0;
      position: relative;
      z-index: 2;
    }
    .section-title {
      font-size: 2.4rem;
      font-weight: 700;
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      color: var(--text-secondary);
      font-size: 1.1rem;
      margin-bottom: 48px;
      max-width: 600px;
    }
    .accent-text {
      color: var(--cyan);
      text-shadow: 0 0 8px rgba(0,240,255,0.3);
    }
    .btn-primary {
      background: linear-gradient(135deg, var(--cyan), var(--purple));
      color: #fff;
      padding: 14px 36px;
      border-radius: var(--radius-btn);
      font-weight: 700;
      box-shadow: var(--glow-cyan);
      letter-spacing: 0.5px;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-primary:hover {
      box-shadow: 0 0 30px rgba(0,240,255,0.7);
      transform: scale(1.05);
    }
    .btn-outline {
      border: 1px solid var(--cyan);
      color: var(--cyan);
      padding: 13px 34px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      background: transparent;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-outline:hover {
      background: rgba(0,240,255,0.1);
      box-shadow: 0 0 15px rgba(0,240,255,0.3);
    }
    
    /* ----- Hero 首屏 ----- */
    #hero {
      min-height: 100vh;
      display: flex;
      align-items: center;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
      padding-top: 90px;
    }
    #hero::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,14,27,0.92) 0%, rgba(10,14,27,0.5) 70%);
      z-index: 1;
    }
    .hero-content {
      position: relative;
      z-index: 3;
      max-width: 700px;
    }
    .hero h1 {
      font-size: 3.4rem;
      font-weight: 800;
      line-height: 1.2;
      margin-bottom: 24px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }
    .hero p {
      font-size: 1.2rem;
      color: #C4D0E6;
      margin-bottom: 40px;
      line-height: 1.7;
    }
    .hero-buttons {
      display: flex;
      gap: 20px;
      flex-wrap: wrap;
    }
    @media (max-width: 768px) {
      .hero h1 {
        font-size: 2.4rem;
      }
      .hero p {
        font-size: 1rem;
      }
    }
    
    /* ----- 玻璃拟态卡片复用 ----- */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
    }
    
    /* 优势区 2+1 不对称布局 */
    #advantages .adv-grid {
      display: grid;
      grid-template-columns: 1fr 1.4fr;
      gap: 24px;
      align-items: start;
    }
    .adv-left {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .adv-card {
      padding: 28px;
      transition: transform 0.2s;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0,240,255,0.5);
    }
    .adv-card i {
      font-size: 2.2rem;
      color: var(--cyan);
      margin-bottom: 16px;
      text-shadow: 0 0 12px var(--cyan);
    }
    .adv-card h3 {
      font-size: 1.5rem;
      margin-bottom: 10px;
    }
    @media (max-width: 768px) {
      #advantages .adv-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 产品 2x3 矩阵 */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 24px;
    }
    .product-card {
      overflow: hidden;
    }
    .product-card img {
      border-radius: var(--radius-img) var(--radius-img) 0 0;
      height: 200px;
      object-fit: cover;
      width: 100%;
    }
    .product-info {
      padding: 20px;
    }
    .tag {
      background: rgba(0,240,255,0.1);
      color: var(--cyan);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8rem;
      font-weight: 600;
      display: inline-block;
      margin-bottom: 10px;
    }
    .product-features {
      list-style: none;
      color: var(--text-secondary);
      margin: 16px 0;
      font-size: 0.9rem;
    }
    .product-features li {
      margin-bottom: 6px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .text-link {
      color: var(--cyan);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }
    .text-link:hover i {
      transform: translateX(6px);
    }
    @media (max-width: 1024px) {
      .products-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 600px) {
      .products-grid {
        grid-template-columns: 1fr;
      }
    }
    
    /* 场景交替 */
    .scenario-row {
      display: flex;
      align-items: center;
      gap: 48px;
      margin-bottom: 80px;
    }
    .scenario-row.reverse {
      flex-direction: row-reverse;
    }
    .scenario-text {
      flex: 1;
    }
    .scenario-img {
      flex: 1;
      border-radius: var(--radius-img);
      overflow: hidden;
      border: 1px solid rgba(0,240,255,0.25);
      box-shadow: 0 0 25px rgba(0,240,255,0.25);
    }
    @media (max-width: 768px) {
      .scenario-row, .scenario-row.reverse {
        flex-direction: column;
      }
    }
    
    /* 数据区 */
    .stats-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-around;
      gap: 30px;
      text-align: center;
    }
    .stat-item h3 {
      font-family: var(--font-display);
      font-size: 3.5rem;
      font-weight: 400;
      color: var(--cyan);
      text-shadow: 0 0 20px var(--cyan);
    }
    
    /* 案例横向滑动 */
    .cases-scroll {
      display: flex;
      gap: 24px;
      overflow-x: auto;
      padding-bottom: 16px;
      scroll-snap-type: x mandatory;
    }
    .case-card {
      min-width: 300px;
      flex: 0 0 auto;
      padding: 24px;
      scroll-snap-align: start;
    }
    
    /* FAQ 手风琴 */
    .faq-item {
      border-bottom: 1px solid rgba(255,255,255,0.05);
    }
    .faq-question {
      padding: 20px 0;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
      color: var(--text-secondary);
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding-bottom: 16px;
    }
    
    /* CTA 底栏 */
    #cta {
      background: linear-gradient(180deg, rgba(10,14,27,0) 0%, rgba(0,240,255,0.08) 100%);
    }
    
    /* Footer */
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
    }
    @media (max-width: 768px) {
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .mobile-bottom-nav {
        bottom: 12px;
      }
      section {
        padding: 70px 0;
      }
    }
    
    /* 其余重置 */
    .footer-bottom {
      border-top: 1px solid rgba(255,255,255,0.05);
      margin-top: 40px;
      padding-top: 24px;
      color: var(--text-muted);
    }