/* Reset, typography and the shared component primitives (buttons, fields,
   alerts, cards) used by every page. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  line-height: var(--line-height-tight);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.015em;
}

h1 {
  font-size: var(--font-size-2xl);
}

h2 {
  font-size: var(--font-size-xl);
}

h3 {
  font-size: var(--font-size-lg);
}

p {
  margin: 0;
}

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

a:hover {
  text-decoration: underline;
}

img,
svg {
  display: block;
  max-width: 100%;
}

/* The `hidden` attribute must win over any author `display` rule, otherwise a
   component styled with `display: grid` stays visible while marked hidden. */
[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--color-focus-ring);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Visible only to assistive technology. */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: var(--space-xs);
  left: var(--space-xs);
  z-index: var(--z-skip-link);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
}

.skip-link:focus-visible {
  transform: translateY(0);
}

/* ---------------------------------------------------------------- Buttons */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: var(--field-height);
  padding: 0 var(--space-lg);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast), color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast);
}

.button:hover {
  text-decoration: none;
}

.button:active {
  transform: translateY(1px);
}

.button[disabled],
.button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.6;
  transform: none;
}

/* Primary actions use the brand yellow with dark text, as in the reference UI. */
.button--primary {
  background-color: var(--color-brand);
  color: var(--color-brand-contrast);
  box-shadow: var(--shadow-sm);
}

.button--primary:hover:not([disabled]) {
  background-color: var(--color-brand-hover);
  box-shadow: var(--shadow-md);
}

.button--primary:active:not([disabled]) {
  background-color: var(--color-brand-hover);
  box-shadow: none;
}

/* Record-level actions such as Edit. */
.button--info {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
}

.button--info:hover:not([disabled]) {
  background-color: var(--color-primary-hover);
  text-decoration: none;
}

/* Destructive actions. */
.button--danger {
  background-color: var(--color-error);
  color: var(--color-error-contrast);
}

.button--danger:hover:not([disabled]) {
  background-color: var(--color-error-hover);
  text-decoration: none;
}

.button--ghost {
  background-color: var(--color-surface);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.button--ghost:hover:not([disabled]) {
  background-color: var(--color-surface-muted);
  border-color: var(--color-text-subtle);
}

.button--sm {
  min-height: var(--control-height-sm);
  padding: 0 var(--space-sm);
  font-size: var(--font-size-sm);
}

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

.button__icon {
  flex: 0 0 auto;
  width: 1rem;
  height: 1rem;
}

/* Spinner shown while a form submission is in flight. */
.button__spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-pill);
  animation: button-spin 600ms linear infinite;
}

.button:not(.is-loading) .button__spinner {
  display: none;
}

.button.is-loading .button__label {
  opacity: 0.85;
}

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

/* ----------------------------------------------------------------- Fields */

.field + .field {
  margin-top: var(--space-md);
}

.field__label {
  display: block;
  margin-bottom: var(--space-2xs);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.field__required {
  color: var(--color-error);
}

.field__control {
  width: 100%;
  min-height: var(--field-height);
  padding: 0 var(--space-sm);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: var(--font-size-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.field__control::placeholder {
  color: var(--color-text-subtle);
}

.field__control:hover {
  border-color: var(--color-text-subtle);
}

.field__control:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.field__control[aria-invalid="true"] {
  border-color: var(--color-error);
}

.field__control[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px var(--color-error-soft);
}

.field__hint {
  margin-top: var(--space-2xs);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.field__error {
  display: flex;
  align-items: center;
  gap: var(--space-2xs);
  margin-top: var(--space-2xs);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-error);
}

/* ----------------------------------------------------------------- Alerts */

.alert {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.alert__icon {
  flex: 0 0 auto;
  width: 1.125rem;
  height: 1.125rem;
  margin-top: 0.1rem;
}

.alert--error {
  background-color: var(--color-error-soft);
  border-color: var(--color-error);
  color: var(--color-error);
}

.alert--info {
  background-color: var(--color-info-soft);
  border-color: var(--color-info);
  color: var(--color-info);
}

.alert--success {
  background-color: var(--color-success-soft);
  border-color: var(--color-success);
  color: var(--color-success);
}

/* --------------------------------------------------------------- Checkbox */

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: var(--control-height-sm);
  cursor: pointer;
  user-select: none;
}

.checkbox__input {
  width: 1.125rem;
  height: 1.125rem;
  margin: 0;
  accent-color: var(--color-brand);
  cursor: pointer;
}

.checkbox__label {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

/* ------------------------------------------------------------------ Cards */

.card {
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

/* ------------------------------------------------------------------ Badge */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-3xs) var(--space-xs);
  border-radius: var(--radius-pill);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
}

.badge::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: var(--radius-pill);
  background-color: currentColor;
}

.badge--success {
  background-color: var(--color-success-soft);
  color: var(--color-success);
}

.badge--error {
  background-color: var(--color-error-soft);
  color: var(--color-error);
}

/* ------------------------------------------------------------- Error page */

.message-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-lg);
}

.message-page__card {
  max-width: 34rem;
  text-align: center;
}

.message-page__status {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-subtle);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.message-page__heading {
  margin-top: var(--space-xs);
}

.message-page__text {
  margin-top: var(--space-sm);
  color: var(--color-text-muted);
}

.message-page__actions {
  margin-top: var(--space-lg);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}