* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
  }
  
  body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #1e3c72, #2a5298); /* Lebih gelap, elegan */
    height: 100vh;
    overflow: hidden;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
  }
  
  /* BACKGROUND TEXT */
  .background-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 140px;
    font-weight: 800;
    z-index: 0;
    white-space: nowrap;
    user-select: none;
    pointer-events: none;
    animation: fadeText 6s infinite ease-in-out;
    text-align: center;
  }
  
  .background-text .red {
    color: rgba(255, 0, 0, 0.8); /* Merah terang */
    text-shadow: 2px 2px 4px rgba(0,0,0,0.7);
  }
  
  .background-text .white {
    color: rgba(255, 255, 255, 0.95); /* Putih terang */
    text-shadow: 2px 2px 6px rgba(0,0,0,0.7);
  }
  
  @keyframes fadeText {
    0%   { opacity: 0.08; transform: translate(-50%, -50%) scale(1); }
    50%  { opacity: 0.15; transform: translate(-50%, -50%) scale(1.03); }
    100% { opacity: 0.08; transform: translate(-50%, -50%) scale(1); }
  }
  
  /* LOGIN FORM */
  .login-container {
    position: relative;
    background: rgba(255, 255, 255, 0.15); /* Transparan */
    backdrop-filter: blur(12px);           /* Blur background */
    -webkit-backdrop-filter: blur(12px);
    padding: 40px 30px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    width: 320px;
    z-index: 1;
    animation: fadeIn 0.6s ease-in-out;
    border: 1px solid rgba(255, 255, 255, 0.2);
  }
  
  .login-container h2 {
    text-align: center;
    margin-bottom: 25px;
    color: #fff;
    font-weight: 500;
  }
  
  .input-group {
    position: relative;
    margin-bottom: 20px;
  }
  
  .input-group i {
    position: absolute;
    top: 50%;
    left: 12px;
    transform: translateY(-50%);
    color: #ddd;
  }
  
  .input-group input,
  .input-group select {
    width: 100%;
    padding: 10px 10px 10px 36px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    outline: none;
    background: rgba(255,255,255,0.2);
    color: #fff;
    border: 1px solid rgba(255,255,255,0.3);
  }
  
  .input-group input::placeholder {
    color: #eee;
  }
  
  .input-group select {
    color: #fff;
  }
  
  .input-group input:focus,
  .input-group select:focus {
    border-color: #80bdff;
  }
  
  button {
    width: 100%;
    padding: 12px;
    background: #007bff;
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    transition: background 0.3s;
  }
  
  button:hover {
    background: #0056b3;
  }
  
  @keyframes fadeIn {
    from {
      opacity: 0;
      transform: translateY(-20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }
  
  /* BACKGROUND TEXT */
  .background-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 10vw; /* Responsive based on screen width */
    font-weight: 900;
    z-index: 0;
    user-select: none;
    pointer-events: none;
    animation: fadeText 6s infinite ease-in-out;
    text-align: center;
    opacity: 0.3;
    line-height: 1.1;
    white-space: nowrap;
  }
  
  .background-text .red {
    color: red;
    text-shadow: 4px 4px 12px rgba(255, 0, 0, 0.7),
                 0 0 30px rgba(255, 0, 0, 0.5);
  }
  
  .background-text .white {
    color: white;
    text-shadow: 4px 4px 12px rgba(255, 255, 255, 0.8),
                 0 0 30px rgba(255, 255, 255, 0.6);
  }
  
  /* Animasi */
  @keyframes fadeText {
    0%   { opacity: 0.25; transform: translate(-50%, -50%) scale(1); }
    50%  { opacity: 0.4; transform: translate(-50%, -50%) scale(1.03); }
    100% { opacity: 0.25; transform: translate(-50%, -50%) scale(1); }
  }
  
  /* Responsive untuk layar kecil */
  @media screen and (max-width: 500px) {
    .background-text {
      font-size: 14vw;
    }
  }
  
  
  .background-text .red {
    color: red;
    text-shadow: 4px 4px 12px rgba(255, 0, 0, 0.7), 
                 0 0 30px rgba(255, 0, 0, 0.5);
  }
  
  .background-text .white {
    color: white;
    text-shadow: 4px 4px 12px rgba(255, 255, 255, 0.8),
                 0 0 30px rgba(255, 255, 255, 0.6);
  }
  
  @keyframes fadeText {
    0%   { opacity: 0.25; transform: translate(-50%, -50%) scale(1); }
    50%  { opacity: 0.4; transform: translate(-50%, -50%) scale(1.03); }
    100% { opacity: 0.25; transform: translate(-50%, -50%) scale(1); }
  }
  
  .notification {
    padding: 16px;
    margin: 20px auto;
    width: fit-content;
    max-width: 90%;
    border-radius: 8px;
    font-family: 'Segoe UI', sans-serif;
    font-size: 16px;
    animation: fadeIn 0.5s ease, fadeOut 0.5s ease 3.5s;
    opacity: 0;
    animation-fill-mode: forwards;
  }
  
  .notification.error {
    background-color: #ffe5e5;
    color: #a80000;
    border: 1px solid #f5c2c2;
    box-shadow: 0 0 10px rgba(255, 0, 0, 0.1);
  }
  
  @keyframes fadeIn {
    to { opacity: 1; }
  }
  
  @keyframes fadeOut {
    to { opacity: 0; }
  }