/* ============================================================
   base.css — Reset + primitivas reutilizables
   ============================================================ */

/* ——— Reset / base ——— */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-regular);
  font-size: 1rem;
  line-height: var(--line-height);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-secondary);
  text-decoration: none;
}

a:hover {
  color: var(--color-secondary-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* ——— Focus visible ——— */
a:focus-visible,
button:focus-visible,
input:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  outline-offset: 2px;
}

/* ============================================================
   Button (.btn)
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-1);
  padding: 12px var(--spacing-3);
  border: 1px solid transparent;
  border-radius: var(--radius-medium);
  font-size: 1rem;
  font-weight: var(--font-semibold);
  line-height: 1.4;
  color: var(--color-surface);
  background-color: var(--color-primary);
  transition: background-color var(--duration) var(--easing),
              border-color var(--duration) var(--easing);
}

.btn:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.btn:disabled {
  opacity: .6;
  cursor: not-allowed;
}

.btn--block {
  width: 100%;
}

.btn--secondary {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-background);
}

.btn--danger {
  background-color: var(--color-error);
}

/* ——— Loading ——— */
.btn--loading .spinner {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

.btn--loading .btn__label {
  opacity: .85;
}

/* ============================================================
   Spinner (.spinner)
   ============================================================ */
.spinner {
  width: 20px;
  height: 20px;
  border: 3px solid color-mix(in srgb, var(--color-surface) 40%, transparent);
  border-top-color: var(--color-surface);
  border-radius: 50%;
  animation: spin var(--duration) linear infinite;
}

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

/* ============================================================
   Field / Label / Input
   ============================================================ */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  margin-bottom: var(--spacing-2);
}

.label {
  font-size: .875rem;
  font-weight: var(--font-medium);
  color: var(--color-text-primary);
}

.input {
  width: 100%;
  padding: 12px var(--spacing-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-medium);
  background-color: var(--color-surface);
  font-size: 1rem;
  color: var(--color-text-primary);
  transition: border-color var(--duration) var(--easing),
              box-shadow var(--duration) var(--easing);
}

.input::placeholder {
  color: var(--color-text-secondary);
}

.input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 25%, transparent);
  outline: none;
}

.field--error .input {
  border-color: var(--color-error);
}

.field--error .input:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-error) 25%, transparent);
}

.field__error {
  font-size: .8125rem;
  color: var(--color-error);
}

/* ============================================================
   Card (.auth-card)
   ============================================================ */
.auth-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-large);
  box-shadow: var(--shadow-card);
  padding: var(--spacing-5);
}

/* ============================================================
   Alert (.alert)
   ============================================================ */
.alert {
  padding: var(--spacing-2);
  border-radius: var(--radius-medium);
  font-size: .875rem;
  border: 1px solid transparent;
}

.alert--error {
  background-color: color-mix(in srgb, var(--color-error) 10%, var(--color-surface));
  border-color: var(--color-error);
  color: var(--color-error);
}

.alert--success {
  background-color: color-mix(in srgb, var(--color-success) 10%, var(--color-surface));
  border-color: var(--color-success);
  color: var(--color-success);
}

.alert--info {
  background-color: color-mix(in srgb, var(--color-secondary) 10%, var(--color-surface));
  border-color: var(--color-secondary);
  color: var(--color-secondary);
}

/* ——— Hidden ——— */
[hidden] {
  display: none !important;
}