/* 将 Noto Sans SC 字体应用到整个页面 */
      body {
        font-family: "Noto Sans SC", sans-serif;
        background-color: #111827; /* Màu nền xám đậm (Gray 900) */
        color: #d1d5db; /* Màu chữ xám nhạt */
      }

      /* 背景气泡效果 */
      #background-bubbles {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        z-index: -1;
        overflow: hidden;
      }

      .bubble {
        position: absolute;
        bottom: -150px;
        background-color: rgba(
          59,
          130,
          246,
          0.05
        ); /* Màu bong bóng xanh dương rất nhạt */
        border-radius: 50%;
        animation: moveBubbles 35s linear infinite;
      }

      @keyframes moveBubbles {
        0% {
          transform: translateY(0) rotate(0deg);
        }
        100% {
          transform: translateY(-120vh) rotate(360deg);
        }
      }

      /* 蓝色渐变按钮 */
      .btn-gradient-blue {
        background-image: linear-gradient(to top, #1d4ed8, #3b82f6);
        color: white;
        transition: all 0.2s ease;
        box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.2),
          0 4px 15px rgba(59, 130, 246, 0.25);
        border-radius: 9999px;
      }
      .btn-gradient-blue:hover {
        transform: translateY(-2px);
        box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.2),
          0 8px 20px rgba(59, 130, 246, 0.3);
      }

      /* 绿色渐变按钮 */
      .btn-gradient-green {
        background-image: linear-gradient(to top, #16a34a, #22c55e);
        color: white;
        transition: all 0.2s ease;
        box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.2),
          0 4px 15px rgba(34, 197, 94, 0.25);
        border-radius: 9999px;
      }
      .btn-gradient-green:hover {
        transform: translateY(-2px);
        box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.2),
          0 8px 20px rgba(34, 197, 94, 0.3);
      }

      /* 阴影效果 & 毛玻璃 cho các card */
      .card-shadow {
        background-color: rgba(31, 41, 55, 0.5); /* Màu nền xám đậm mờ */
        backdrop-filter: blur(8px);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 1rem;
      }

      /* 主 CTA 区域的网格背景 */
      .grid-background {
        background-color: rgba(31, 41, 55, 0.3);
        backdrop-filter: blur(4px);
        background-image: linear-gradient(
            rgba(107, 114, 128, 0.2) 1px,
            transparent 1px
          ),
          linear-gradient(
            to right,
            rgba(107, 114, 128, 0.2) 1px,
            transparent 1px
          );
        background-size: 25px 25px;
      }

      /* 跑马灯 */
      @keyframes marquee {
        0% {
          transform: translateX(100%);
        }
        100% {
          transform: translateX(-100%);
        }
      }
      .marquee-container {
        width: 100%;
        overflow: hidden;
        white-space: nowrap;
      }
      .animate-marquee {
        display: inline-block;
        animation: marquee 25s linear infinite;
        padding-left: 100%;
      }

      /* 主 Logo 横幅装饰 */
      .logo-banner {
        position: relative;
      }
      .logo-banner::before,
      .logo-banner::after {
        content: "";
        position: absolute;
        width: 30px;
        height: 12px;
        background-color: #000;
        top: -1px;
        z-index: -1;
      }
      .logo-banner::before {
        left: 20px;
        transform: skewX(-40deg);
      }
      .logo-banner::after {
        right: 20px;
        transform: skewX(40deg);
      }