button, .button {
    appearance: none;
    background: linear-gradient(15deg, var(--primary-color) 0%, var(--primary-color-hover) 35%);
    color: white;
    border: 1px solid transparent;
    border-radius: var(--button-radius);
    padding: var(--button-padding-y) var(--button-padding-x);
    font-size: var(--button-font-size);
    line-height: 1;
    cursor: pointer;
    display: inline-block;
    text-decoration: none;
    transition: background-color .15s ease, border-color .15s ease, box-shadow .15s ease, transform .02s ease;
  }
  /* Icon-only buttons: equal X/Y padding */
  button:has(> svg:only-child),
  .button:has(> svg:only-child) {
    padding: var(--button-icon-padding);
  }
  button:hover, .button:hover {
    filter: brightness(96%);
  }
  button:active, .button:active {
    transform: translateY(1px);
  }
  button:focus-visible, .button:focus-visible {
    outline: none;
  }
  button:disabled, .button:disabled {
    opacity: .6;
    cursor: not-allowed;
  }
  
  /* Ghost/Muted button: subtle outline, primary color text/border */
  .button--ghost {
    background: transparent !important;
    color: var(--primary-color) !important;
    border-color: var(--primary-color) !important;
  }
  .button--ghost:hover {
    color: var(--primary-color-hover) !important;
    border-color: var(--primary-color-hover) !important;
    filter: none;
  }
  
  /* Big button: larger padding and font size */
  .button.button--big {
    padding: var(--button-big-padding-y) var(--button-big-padding-x);
    font-size: var(--button-big-font-size);
  }
  .button.button--big:has(> svg:only-child) {
    padding: var(--button-big-icon-padding);
  }
  
  .button-group .button {
    margin: 5px;
  }