/* roulang page: index */
:root {
      --deep-blue: #0B1A2E;
      --dark-bg-start: #0A111F;
      --dark-bg-end: #132238;
      --cyan: #00E5FF;
      --cyan-glow: rgba(0, 229, 255, 0.5);
      --orange: #FF6B35;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(255, 255, 255, 0.2);
      --text-primary: #FFFFFF;
      --text-secondary: rgba(255, 255, 255, 0.75);
      --text-muted: rgba(255, 255, 255, 0.5);
      --border-light: rgba(255, 255, 255, 0.15);
      --card-radius: 20px;
      --btn-radius: 50px;
      --input-radius: 12px;
      --sidebar-width: 240px;
      --font-sans: 'Inter', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: var(--font-sans);
      background: radial-gradient(circle at 20% 10%, #1a2c3f, #0A111F 80%);
      background-attachment: fixed;
      color: var(--text-primary);
      margin: 0;
      padding: 0;
      line-height: 1.8;
      overflow-x: hidden;
      display: flex;
      min-height: 100vh;
    }

    /* 全局噪点纹理 */
    body::before {
      content: "";
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="3" stitchTiles="stitch"/></filter><rect width="100" height="100" filter="url(/%23noise)" opacity="0.04"/></svg>');
      pointer-events: none;
      z-index: 0;
    }

    /* 左侧导航栏 - 桌面 */
    .app-sidebar {
      position: fixed;
      left: 0;
      top: 0;
      width: var(--sidebar-width);
      height: 100vh;
      background: rgba(10, 17, 31, 0.9);
      backdrop-filter: blur(30px);
      -webkit-backdrop-filter: blur(30px);
      border-right: 1px solid rgba(255, 255, 255, 0.06);
      display: flex;
      flex-direction: column;
      justify-content: flex-start;
      padding: 2rem 0;
      z-index: 1050;
      transition: transform 0.3s ease;
    }

    .sidebar-logo {
      padding: 0 1.8rem 2rem;
      font-size: 1.8rem;
      font-weight: 700;
      letter-spacing: 2px;
      color: var(--text-primary);
      border-bottom: 1px solid rgba(255,255,255,0.06);
      margin-bottom: 2rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }
    .sidebar-logo i {
      font-size: 2rem;
      color: var(--cyan);
    }

    .nav-menu {
      list-style: none;
      padding: 0 1.8rem;
      margin: 0;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .nav-item {
      position: relative;
    }

    .nav-link {
      display: block;
      padding: 0.8rem 1rem;
      color: var(--text-secondary);
      text-decoration: none;
      font-weight: 500;
      border-radius: 12px;
      transition: all 0.2s ease;
      background: transparent;
      border: none;
      text-align: left;
      width: 100%;
      font-size: 1rem;
      letter-spacing: 0.3px;
      position: relative;
    }

    .nav-link:hover {
      color: white;
      background: rgba(255,255,255,0.05);
    }

    .nav-link.active {
      color: white;
      background: rgba(0, 229, 255, 0.08);
    }
    .nav-link.active::before {
      content: '';
      position: absolute;
      left: -1rem;
      top: 20%;
      height: 60%;
      width: 4px;
      background: var(--cyan);
      border-radius: 4px;
      box-shadow: 0 0 12px var(--cyan-glow);
    }

    /* 主内容区 */
    .main-content {
      margin-left: var(--sidebar-width);
      width: calc(100% - var(--sidebar-width));
      position: relative;
      z-index: 1;
      background: transparent;
    }

    /* 移动端顶部栏 */
    .mobile-header {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 60px;
      background: rgba(10, 17, 31, 0.95);
      backdrop-filter: blur(20px);
      z-index: 1040;
      align-items: center;
      justify-content: space-between;
      padding: 0 1.5rem;
      border-bottom: 1px solid rgba(255,255,255,0.06);
    }
    .mobile-logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: white;
    }
    .menu-toggle {
      background: transparent;
      border: none;
      color: white;
      font-size: 2rem;
    }

    /* 抽屉菜单 */
    .mobile-drawer {
      position: fixed;
      top: 0;
      left: 0;
      width: 260px;
      height: 100vh;
      background: rgba(10, 17, 31, 0.98);
      backdrop-filter: blur(30px);
      z-index: 1060;
      transform: translateX(-100%);
      transition: transform 0.3s ease;
      padding: 2rem 1.5rem;
      display: flex;
      flex-direction: column;
    }
    .mobile-drawer.open {
      transform: translateX(0);
    }
    .drawer-overlay {
      position: fixed;
      inset: 0;
      background: rgba(0,0,0,0.5);
      z-index: 1055;
      display: none;
    }
    .drawer-overlay.show {
      display: block;
    }

    /* 通用区块 */
    .section-block {
      padding: 5rem 2rem;
      max-width: 1200px;
      margin: 0 auto;
    }

    h1, h2, h3 {
      font-weight: 700;
      letter-spacing: 0.5px;
    }
    h1 {
      font-size: 3.5rem;
      line-height: 1.2;
    }
    h2 {
      font-size: 2.5rem;
      margin-bottom: 2.5rem;
    }
    h3 {
      font-size: 1.5rem;
    }
    .text-muted-custom {
      color: var(--text-muted);
    }
    .text-secondary-custom {
      color: var(--text-secondary);
    }

    /* 玻璃卡片 */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid var(--glass-border);
      border-radius: var(--card-radius);
      transition: all 0.3s ease;
    }
    .glass-card:hover {
      border-color: var(--glass-hover-border);
      background: rgba(255,255,255,0.06);
      transform: translateY(-4px);
    }

    .btn-glow {
      background: var(--cyan);
      color: #0B1A2E;
      font-weight: 700;
      border-radius: var(--btn-radius);
      padding: 0.8rem 2.2rem;
      border: none;
      box-shadow: 0 0 20px rgba(0, 229, 255, 0.4);
      transition: all 0.3s;
      text-decoration: none;
      display: inline-block;
    }
    .btn-glow:hover {
      box-shadow: 0 0 30px rgba(0, 229, 255, 0.7);
      transform: scale(1.05);
      color: #0B1A2E;
    }
    .btn-outline-light-custom {
      background: transparent;
      border: 1px solid var(--border-light);
      color: white;
      border-radius: var(--btn-radius);
      padding: 0.7rem 2rem;
      transition: 0.3s;
      text-decoration: none;
    }
    .btn-outline-light-custom:hover {
      border-color: white;
      background: rgba(255,255,255,0.1);
      color: white;
    }

    /* Hero区域 */
    .hero-container {
      display: flex;
      align-items: center;
      min-height: 100vh;
      padding: 2rem;
      background-image: url('/assets/images/backpic/back-1.webp');
      background-size: cover;
      background-position: center;
      position: relative;
    }
    .hero-overlay {
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, rgba(10,17,31,0.9) 40%, rgba(10,17,31,0.6) 100%);
    }
    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 600px;
    }
    .floating-card {
      background: rgba(20, 30, 44, 0.7);
      backdrop-filter: blur(18px);
      border: 1px solid rgba(255,255,255,0.15);
      border-radius: 24px;
      padding: 1.5rem;
      color: white;
      box-shadow: 0 20px 40px rgba(0,0,0,0.5);
    }

    /* 功能卡片 */
    .feature-icon {
      font-size: 2.5rem;
      color: var(--cyan);
      margin-bottom: 1.2rem;
    }

    /* 场景图片 */
    .scene-img {
      width: 100%;
      border-radius: 20px;
      border: 1px solid rgba(255,255,255,0.1);
      object-fit: cover;
    }

    /* 案例数字 */
    .big-number {
      font-size: 3rem;
      font-weight: 700;
      color: var(--cyan);
    }

    /* 价格卡片高亮 */
    .pricing-card.popular {
      border: 1px solid var(--cyan);
      box-shadow: 0 0 25px rgba(0,229,255,0.3);
      position: relative;
    }
    .popular-badge {
      background: var(--orange);
      color: white;
      font-size: 0.8rem;
      padding: 0.2rem 1rem;
      border-radius: 20px;
      position: absolute;
      top: -12px;
      right: 20px;
    }

    /* FAQ手风琴 */
    .accordion-button {
      background: transparent !important;
      color: white !important;
      font-weight: 600;
      border: none;
      box-shadow: none;
    }
    .accordion-item {
      background: transparent;
      border: 1px solid var(--glass-border);
      border-radius: 16px !important;
      margin-bottom: 1rem;
      overflow: hidden;
    }
    .accordion-button:not(.collapsed) {
      background: rgba(255,255,255,0.05) !important;
    }

    /* 表单 */
    .form-control-dark {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.15);
      color: white;
      border-radius: 12px;
      padding: 0.8rem;
    }
    .form-control-dark:focus {
      border-color: var(--cyan);
      box-shadow: 0 0 8px rgba(0,229,255,0.3);
      background: rgba(0,0,0,0.3);
    }

    footer {
      border-top: 1px solid rgba(255,255,255,0.06);
    }

    @media (max-width: 768px) {
      .app-sidebar {
        display: none;
      }
      .mobile-header {
        display: flex;
      }
      .main-content {
        margin-left: 0;
        width: 100%;
        padding-top: 60px;
      }
      h1 {
        font-size: 2.2rem;
      }
      h2 {
        font-size: 1.8rem;
      }
      .hero-container {
        min-height: 90vh;
        flex-direction: column;
        text-align: center;
      }
      .floating-card {
        margin-top: 2rem;
      }
    }