/* roulang page: index */
:root {
      --primary: #00F0FF;
      --secondary: #0A0E27;
      --accent: #FF3CAC;
      --surface-glass: rgba(255, 255, 255, 0.05);
      --text-main: #E8F0FE;
      --text-muted: #8892B0;
      --border-glow: rgba(0, 240, 255, 0.2);
      --border-strong: rgba(0, 240, 255, 0.5);
      --shadow-card: 0 8px 32px rgba(0, 240, 255, 0.08);
      --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.4);
      --shadow-accent-glow: 0 0 24px rgba(255, 60, 172, 0.5);
      --radius-card: 16px;
      --radius-btn: 50px;
      --radius-input: 12px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
      --font-mono: 'JetBrains Mono', monospace;
      --spacing-xs: 8px;
      --spacing-sm: 16px;
      --spacing-md: 24px;
      --spacing-lg: 32px;
      --spacing-xl: 48px;
      --spacing-xxl: 80px;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 20%, #0f1535, #0A0E27 80%);
      color: var(--text-main);
      line-height: 1.7;
      margin: 0;
      padding: 0;
      overflow-x: hidden;
      position: relative;
    }

    /* 网格纹理背景 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: linear-gradient(rgba(0, 240, 255, 0.03) 1px, transparent 1px),
                        linear-gradient(90deg, rgba(0, 240, 255, 0.03) 1px, transparent 1px);
      background-size: 40px 40px;
      pointer-events: none;
      z-index: -2;
    }

    h1, h2, h3, h4, h5, h6 {
      font-weight: 700;
      letter-spacing: -0.3px;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: color 0.2s;
    }
    a:hover {
      color: #fff;
    }

    img {
      max-width: 100%;
      height: auto;
    }

    /* 自定义容器 */
    .container-custom {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 浮动Dock导航 */
    .navbar-dock {
      position: fixed;
      top: 20px;
      left: 50%;
      transform: translateX(-50%);
      width: min(92%, 720px);
      background: rgba(10, 14, 39, 0.7);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: 50px;
      padding: 8px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      z-index: 1000;
      transition: background 0.3s, box-shadow 0.3s;
    }
    .navbar-dock.scrolled {
      background: rgba(10, 14, 39, 0.92);
      box-shadow: 0 10px 30px rgba(0, 240, 255, 0.2);
    }
    .logo-text {
      font-weight: 800;
      font-size: 20px;
      background: linear-gradient(135deg, #00F0FF, #00C8FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      white-space: nowrap;
    }
    .nav-menu {
      display: flex;
      gap: 28px;
      list-style: none;
      margin: 0;
      padding: 0;
    }
    .nav-menu a {
      color: var(--text-muted);
      font-weight: 500;
      font-size: 15px;
      transition: color 0.2s;
    }
    .nav-menu a:hover, .nav-menu a.active {
      color: var(--primary);
    }
    .btn-dock {
      background: var(--primary);
      color: #0A0E27;
      border-radius: 50px;
      padding: 8px 20px;
      font-weight: 600;
      font-size: 14px;
      border: none;
      transition: all 0.25s;
      white-space: nowrap;
    }
    .btn-dock:hover {
      box-shadow: 0 0 18px rgba(0, 240, 255, 0.6);
      transform: scale(1.03);
      color: #0A0E27;
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      display: none;
      position: fixed;
      bottom: 12px;
      left: 50%;
      transform: translateX(-50%);
      width: 92%;
      background: rgba(10, 14, 39, 0.85);
      backdrop-filter: blur(20px);
      border: 1px solid var(--border-glow);
      border-radius: 40px;
      padding: 10px 20px;
      z-index: 1000;
      justify-content: space-around;
      align-items: center;
    }
    .mobile-bottom-nav a {
      color: var(--text-muted);
      font-size: 20px;
    }
    .mobile-bottom-nav a.active {
      color: var(--primary);
    }
    .hamburger {
      background: none;
      border: none;
      color: var(--primary);
      font-size: 24px;
    }

    /* Hero */
    .hero-section {
      min-height: 100vh;
      display: flex;
      align-items: center;
      position: relative;
      background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      background-blend-mode: overlay;
      margin-top: 0;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(180deg, rgba(10,14,39,0.7) 0%, rgba(10,14,39,0.9) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      text-align: center;
      width: 100%;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.15;
      background: linear-gradient(to right, #00F0FF, #00C8FF);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin-bottom: 20px;
    }
    .hero-sub {
      font-size: 18px;
      color: #cbd5e0;
      max-width: 600px;
      margin: 0 auto 32px;
    }
    .btn-primary-glow {
      background: var(--primary);
      color: #0A0E27;
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 700;
      border: none;
      box-shadow: var(--shadow-glow);
      transition: 0.25s;
    }
    .btn-primary-glow:hover {
      box-shadow: 0 0 28px rgba(0,240,255,0.7);
      transform: scale(1.04);
    }
    .btn-outline-glow {
      background: transparent;
      border: 1px solid var(--primary);
      color: var(--primary);
      border-radius: 50px;
      padding: 14px 36px;
      font-weight: 600;
      transition: 0.25s;
    }
    .btn-outline-glow:hover {
      background: rgba(0,240,255,0.1);
    }

    /* 区块标题 */
    .section-title {
      font-size: 36px;
      font-weight: 700;
      margin-bottom: 16px;
      color: white;
    }
    .section-sub {
      color: var(--text-muted);
      max-width: 600px;
    }

    /* 卡片玻璃态 */
    .glass-card {
      background: rgba(10,14,39,0.6);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(0,240,255,0.15);
      border-radius: var(--radius-card);
      padding: var(--spacing-lg);
      box-shadow: var(--shadow-card);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--border-strong);
      box-shadow: 0 8px 36px rgba(0,240,255,0.2);
      transform: translateY(-4px);
    }

    .adv-img-top {
      height: 140px;
      object-fit: cover;
      border-radius: 16px 16px 0 0;
      margin: -32px -32px 20px -32px;
      width: calc(100% + 64px);
    }

    /* 数据区 */
    .data-number {
      font-family: var(--font-mono);
      font-size: 48px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 解决方案卡片顶部线 */
    .solution-card {
      border-top: 2px solid var(--primary);
    }

    /* FAQ手风琴 */
    .accordion-button {
      background: transparent;
      color: var(--text-main);
      font-weight: 600;
      font-size: 18px;
      border: 1px solid var(--border-glow);
      border-radius: 12px !important;
      padding: 18px 24px;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(0,240,255,0.08);
      color: var(--primary);
      border-color: var(--primary);
    }
    .accordion-item {
      background: transparent;
      border: none;
      margin-bottom: 16px;
    }

    /* CTA横幅 */
    .cta-banner {
      background: linear-gradient(135deg, #00F0FF, #0A0E27);
      position: relative;
    }
    .btn-accent {
      background: var(--accent);
      color: white;
      border-radius: 50px;
      padding: 16px 40px;
      box-shadow: var(--shadow-accent-glow);
      border: none;
      font-weight: 700;
    }

    /* 页脚 */
    .footer {
      background: #060B1F;
      border-top: 1px solid rgba(0,240,255,0.2);
    }

    @media (max-width: 768px) {
      .navbar-dock {
        display: none;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .hero-title {
        font-size: 34px;
      }
      .section-title {
        font-size: 28px;
      }
    }