/* Custom properties for easy color customization */
:root {
    --bg-color: #121212;
    --card-bg: #1c1c1e;
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --accent-color: #f59e0b; /* Golden beer amber */
    --accent-hover: #d97706;
    --input-bg: #2c2c2e;
    --border-radius: 16px;
    --transition-speed: 0.2s;
  }

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

  body {
    font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
  }

  .app-container {
    width: 100%;
    max-width: 400px;
    display: flex;
    flex-direction: column;
    gap: 24px;
  }

  /* Header Styling */
  .hero {
    text-align: center;
    padding: 10px 0;
  }

  .mug-icon {
    font-size: 3.5rem;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 12px rgba(245, 158, 11, 0.3));
  }

  .hero h1 {
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 8px;
  }

  .hero .subtitle {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
  }

  /* Form Container */
  .form-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 28px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  }

  form {
    display: flex;
    flex-direction: column;
    gap: 20px;
  }

  .input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
  }

  .input-group label {
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary);
  }

  .input-group input {
    background-color: var(--input-bg);
    color: var(--text-primary);
    border: 1.5px solid transparent;
    border-radius: 10px;
    padding: 14px 16px;
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition-speed) ease;
  }

  .input-group input:focus {
    border-color: var(--accent-color);
  }

  .input-group input::placeholder {
    color: #71717a;
  }

  /* Interactive CTA Button */
  button {
    background-color: var(--accent-color);
    color: #000000;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    border-radius: 12px;
    padding: 16px;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 12px;
    transition: background-color var(--transition-speed) ease, transform 0.1s ease;
    position: relative;
  }

  button:hover {
    background-color: var(--accent-hover);
  }

  button:active {
    transform: scale(0.98);
  }

  /* Button Loading State Styles (Handled dynamically in app.js if needed) */
  button.loading {
    background-color: var(--accent-hover);
    pointer-events: none;
  }

  button.loading .btn-text {
    visibility: hidden;
  }

  button.loading .btn-loader {
    display: block;
    position: absolute;
    width: 24px;
    height: 24px;
    border: 3px solid rgba(0, 0, 0, 0.1);
    border-top-color: #000000;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
  }

  .btn-loader {
    display: none;
  }

  /* Footer disclaimer */
  .info-footer {
    text-align: center;
    padding: 0 10px;
  }

  .info-footer p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
  }

  /* Animations */
  @keyframes spin {
    to { transform: rotate(360deg); }
  }