* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    @property --angle {
      syntax: '<angle>';
      initial-value: 0deg;
      inherits: false;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: white;
      min-height: 100vh;
      overflow-x: hidden;
      position: relative;
    }

    /* Video Background */
    #bg-video {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      object-fit: cover;
      z-index: -2;
      opacity: 0;
      transition: opacity 1s ease;
    }

    #bg-video.loaded {
      opacity: 1;
    }

    /* Placeholder background khi video chưa load */
    .bg-placeholder {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: url('assets/img/bg.webp') center/cover no-repeat;
      z-index: -3;
      transition: opacity 0.8s ease;
    }

    .bg-placeholder.loaded {
      opacity: 0;
    }

    /* Overlay tối để chữ dễ đọc */
    .overlay {
      position: fixed;
      top: 0; left: 0;
      width: 100%; height: 100%;
      background: rgba(0, 0, 0, 0.45); /* điều chỉnh độ tối nếu cần */
      z-index: -1;
    }

    .container {
      position: relative;
      z-index: 1;
      width: 100%;
      max-width: 420px;
      margin: 0 auto;
      padding: 40px 20px;
      text-align: center;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .avatar-wrapper {
      position: relative;
      width: 160px;
      height: 160px;
      margin: 0 auto 24px;
    }

    .avatar {
      width: 130px;
      height: 130px;
      border-radius: 50%;
      object-fit: cover;
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      z-index: 3;
      border: 4px solid rgba(255, 255, 255, 0.18);
      box-shadow: 0 0 30px rgba(100, 100, 255, 0.4);
    }

    .avatar-wrapper::before {
      content: "";
      position: absolute;
      inset: 0;
      border-radius: 50%;
      
      animation: rotate 10s linear infinite;
      filter: blur(6px);
      z-index: 1;
      box-shadow: 0 0 40px rgba(255, 0, 200, 0.6), 0 0 80px rgba(0, 255, 234, 0.4);
    }

    .avatar-wrapper::after {
      content: "";
      position: absolute;
      inset: -15px;
      border-radius: 50%;
      background: conic-gradient(
        from calc(var(--angle) * -1),
        transparent 0deg 100deg,
        rgba(0, 255, 255, 0.7) 120deg 180deg,
        transparent 200deg 280deg,
        rgba(255, 0, 255, 0.6) 300deg 360deg
      );
      animation: rotate 14s linear infinite reverse;
      filter: blur(12px);
      z-index: 0;
      opacity: 0.8;
    }

    @keyframes rotate {
      to { --angle: 360deg; }
    }

    .name {
      font-size: 2.4rem;
      font-weight: 800;
      margin-bottom: 10px;
      text-shadow: 0 0 20px rgba(100, 100, 255, 0.7);
    }

    .bio {
      font-size: 1.1rem;
      opacity: 0.9;
      margin-bottom: 40px;
      line-height: 1.6;
      text-shadow: 0 2px 10px rgba(0,0,0,0.6);
    }

    .links {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 50px;
    }

    .btn {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      background: rgba(255,255,255,0.08);
      backdrop-filter: blur(12px);
      border: 1px solid rgba(255,255,255,0.15);
      color: white;
      text-decoration: none;
      font-size: 1.15rem;
      font-weight: 600;
      padding: 18px 28px;
      border-radius: 999px;
      transition: all 0.4s ease;
      box-shadow: 0 6px 20px rgba(0,0,0,0.3);
    }

    .btn:hover {
      background: rgba(255,255,255,0.2);
      transform: translateY(-4px) scale(1.03);
      box-shadow: 0 12px 35px rgba(100, 100, 255, 0.5);
    }

    .btn i {
      font-size: 1.4rem;
    }

    .socials {
      display: flex;
      justify-content: center;
      gap: 28px;
      margin-top: 30px;
    }

    .socials a {
      color: white;
      font-size: 2rem;
      opacity: 0.8;
      transition: all 0.4s;
    }

    .socials a:hover {
      opacity: 1;
      transform: scale(1.2) rotate(10deg);
      text-shadow: 0 0 15px currentColor;
    }

    footer {
      margin-top: 60px;
      font-size: 0.95rem;
      opacity: 0.6;
      text-shadow: 0 1px 5px black;
    }

    @media (max-width: 500px) {
      .avatar-wrapper { width: 140px; height: 140px; }
      .avatar { width: 110px; height: 110px; }
      .name { font-size: 2.1rem; }
      .btn { padding: 16px 24px; font-size: 1.05rem; }
      .container { padding: 30px 15px; }
    }