@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;600&display=swap');
  body {
    font-family: 'Poppins', sans-serif;
    background-color: #fff9f2;
    color: #5e381e;
    margin: 0;
    padding: 0;
    display: flex;
    min-height: 100vh;
    justify-content: center;
    align-items: center;
  }
  body.dark {
    background-color: #111;
    color: #eee;
  }
  .container {
    background: #fff;
    padding: 30px 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
    max-width: 400px;
    width: 100%;
    text-align: center;
  }
  body.dark .container {
    background: #222;
  }
  h1.title {
    font-size: 3rem;
    color: #b14c05;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
  }
  h2.subtitle {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #5e381e;
  }
  body.dark h2.subtitle {
    color: #d4a65b;
  }
  input[type=number] {
    width: 100%;
    padding: 12px 15px;
    font-size: 1.2rem;
    border: 2px solid #dba55d;
    border-radius: 10px;
    margin-bottom: 20px;
    outline: none;
    transition: border-color 0.3s ease;
  }
  input[type=number]:focus {
    border-color: #b14c05;
  }
  button {
    background-color: #db5f07;
    color: white;
    border: none;
    padding: 12px 25px;
    font-size: 1.1rem;
    border-radius: 10px;
    cursor: pointer;
    margin: 5px 8px;
    transition: background-color 0.3s ease;
    box-shadow: 0 4px 8px rgb(219 95 7 / 0.6);
  }
  button:hover:not(:disabled) {
    background-color: #b14c05;
    box-shadow: 0 6px 12px rgb(177 76 5 / 0.8);
  }
  button:disabled {
    background-color: #aaa;
    cursor: not-allowed;
    box-shadow: none;
  }
  #result {
    margin-top: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    color: green;
    min-height: 50px;
  }
  body.dark #result {
    color: #a6e22e;
  }
  body {
  position: relative;  /* to position absolute children relative to body */
}

.logo-container {
  position: absolute;
  top: 15px;
  left: 15px;
  z-index: 1000; /* so it stays on top */
}

.logo-container img {
  width: 60px;
  height: 60px;
  object-fit: contain;
  border-radius: 10px; /* optional: rounded corners */
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
}