/* Buttons */
.btn {
  align-items: center;
  border: 1px solid transparent;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--font-weight-semibold);
  gap: var(--space-2);
  justify-content: center;
  line-height: var(--line-base);
  min-height: 44px;
  min-width: 44px;
  padding-inline: var(--space-4);
  text-decoration: none;
  transition: background-color var(--duration-fast) var(--ease-default),
    border-color var(--duration-fast) var(--ease-default),
    box-shadow var(--duration-fast) var(--ease-default),
    color var(--duration-fast) var(--ease-default),
    transform var(--duration-fast) var(--ease-default);
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 2px;
}

.btn:active {
  box-shadow: var(--shadow-none);
  transform: scale(0.98);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  background: var(--color-neutral-300);
  border-color: var(--color-neutral-300);
  color: var(--color-neutral-500);
  cursor: not-allowed;
  pointer-events: none;
}

.btn.is-loading {
  color: transparent !important;
  pointer-events: none;
  position: relative;
}

.btn.is-loading::after {
  animation: button-spin 0.8s linear infinite;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: var(--radius-full);
  content: "";
  height: 1rem;
  left: 50%;
  margin-left: -0.5rem;
  margin-top: -0.5rem;
  position: absolute;
  top: 50%;
  width: 1rem;
}

.btn--primary {
  background: var(--color-primary-400);
  box-shadow: var(--shadow-sm);
  color: var(--color-neutral-950);
}

.btn--primary:hover {
  background: var(--color-primary-500);
}

.btn--secondary {
  background: var(--color-neutral-100);
  border-color: var(--color-neutral-200);
  color: var(--color-neutral-800);
}

.btn--secondary:hover {
  background: var(--color-neutral-200);
}

.btn--tertiary {
  background: transparent;
  color: var(--color-primary-600);
}

.btn--tertiary:hover {
  background: var(--color-neutral-100);
}

.btn--danger {
  background: var(--color-error-light);
  border-color: var(--color-error-border);
  color: var(--color-error-700);
}

.btn--danger:hover {
  background: var(--color-error-100);
}

.btn--sm {
  font-size: var(--text-sm);
  min-height: 32px;
  padding-inline: var(--space-3);
}

.btn--lg {
  font-size: var(--text-lg);
  min-height: 56px;
  padding-inline: var(--space-6);
}

/* Form controls */
.form-stack {
  display: grid;
  gap: var(--space-6);
}

.form-field {
  display: grid;
  gap: var(--space-1);
}

.form-label {
  color: var(--color-neutral-800);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-sm);
}

.form-input,
.form-select {
  appearance: none;
  background: var(--color-neutral-100);
  border: 1px solid var(--color-neutral-200);
  border-radius: var(--radius-md);
  color: var(--color-neutral-800);
  font-size: var(--text-base);
  height: 48px;
  line-height: var(--line-base);
  padding-inline: var(--space-4);
  transition: border-color var(--duration-fast) var(--ease-default),
    box-shadow var(--duration-fast) var(--ease-default);
  width: 100%;
}

.form-select {
  background-image: linear-gradient(45deg, transparent 50%, var(--color-neutral-600) 50%),
    linear-gradient(135deg, var(--color-neutral-600) 50%, transparent 50%);
  background-position: calc(100% - 20px) calc(50% - 2px),
    calc(100% - 14px) calc(50% - 2px);
  background-repeat: no-repeat;
  background-size: 6px 6px;
  padding-right: 2.5rem;
}

.form-input:hover,
.form-select:hover {
  border-color: var(--color-primary-300);
}

.form-input:focus,
.form-select:focus {
  border-color: var(--color-primary-400);
  box-shadow: 0 0 0 2px var(--color-primary-200);
  outline: none;
}

.form-input:disabled,
.form-select:disabled {
  background: var(--color-neutral-300);
  color: var(--color-neutral-500);
  cursor: not-allowed;
}

/* Toggle switch */
.toggle {
  align-items: center;
  display: inline-flex;
  gap: var(--space-3);
}

.toggle__input {
  height: 1px;
  opacity: 0;
  position: absolute;
  width: 1px;
}

.toggle__track {
  background: var(--color-neutral-300);
  border-radius: var(--radius-full);
  display: inline-flex;
  flex-shrink: 0;
  height: 24px;
  padding: 2px;
  position: relative;
  transition: background-color var(--duration-fast) var(--ease-default);
  width: 44px;
}

.toggle__thumb {
  background: var(--color-neutral-50);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  display: block;
  height: 20px;
  transition: transform var(--duration-fast) var(--ease-default);
  width: 20px;
}

.toggle__input:checked + .toggle__track {
  background: var(--color-primary-400);
}

.toggle__input:checked + .toggle__track .toggle__thumb {
  transform: translateX(20px);
}

.toggle__input:focus-visible + .toggle__track {
  outline: 2px solid var(--color-primary-400);
  outline-offset: 2px;
}

.toggle__label {
  color: var(--color-neutral-800);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-sm);
}

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

.auth-shell {
  display: grid;
  gap: var(--space-6);
  margin-inline: auto;
  max-width: 480px;
}

.auth-shell__form-outline {
  background: var(--color-neutral-100);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-lg);
  min-height: 220px;
  padding: var(--space-6);
}

.landing-shell {
  margin-bottom: var(--space-10);
}

.landing-shell:last-child {
  margin-bottom: 0;
}

.page-shell {
  display: grid;
  gap: var(--space-6);
  margin-inline: auto;
  max-width: 960px;
}

.page-shell__placeholder {
  align-content: start;
  background: var(--color-neutral-100);
  border: 1px dashed var(--color-neutral-300);
  border-radius: var(--radius-lg);
  display: grid;
  gap: var(--space-4);
  min-height: 220px;
  padding: var(--space-6);
}

.page-shell__actions {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.page-shell__empty-state {
  max-width: 52ch;
}

.page-shell__meta {
  color: var(--color-neutral-600);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}

/* Timeline (Generation Progress) */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-block: var(--space-2);
  padding-left: var(--space-8);
  position: relative;
}

.timeline::before {
  background: var(--color-neutral-200);
  bottom: var(--space-4);
  content: "";
  left: 15px;
  position: absolute;
  top: var(--space-4);
  width: 2px;
}

.timeline__status-region {
  height: 0;
  overflow: hidden;
  position: absolute;
  width: 0;
}

.timeline__item {
  align-items: center;
  display: flex;
  gap: var(--space-3);
  padding-block: var(--space-3);
  position: relative;
  transition: opacity var(--duration-normal) var(--ease-default);
}

.timeline__icon {
  align-items: center;
  border-radius: var(--radius-full);
  display: inline-flex;
  flex-shrink: 0;
  height: 24px;
  justify-content: center;
  left: calc(-1 * var(--space-8) + 4px);
  position: absolute;
  width: 24px;
}

/* Pending state: empty circle */
.timeline__item.is-pending .timeline__icon {
  background: var(--color-neutral-50);
  border: 2px solid var(--color-neutral-300);
}

.timeline__item.is-pending .timeline__label {
  color: var(--color-neutral-400);
  font-size: var(--text-base);
}

/* Active (in-progress) state: spinner */
.timeline__item.is-active .timeline__icon {
  background: var(--color-neutral-50);
  border: 2px solid var(--color-primary-400);
  border-top-color: transparent;
  animation: timeline-spin 0.8s linear infinite;
}

.timeline__item.is-active .timeline__label {
  color: var(--color-neutral-900);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-bold);
}

/* Complete state: checkmark */
.timeline__item.is-complete .timeline__icon {
  background: var(--color-success-600);
  border: 2px solid var(--color-success-600);
}

.timeline__item.is-complete .timeline__icon::after {
  border-bottom: 2px solid var(--color-neutral-50);
  border-right: 2px solid var(--color-neutral-50);
  content: "";
  display: block;
  height: 10px;
  transform: rotate(45deg) translateY(-1px);
  width: 5px;
}

.timeline__item.is-complete .timeline__label {
  color: var(--color-neutral-500);
  font-size: var(--text-base);
}

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

@media (prefers-reduced-motion: reduce) {
  .timeline__item.is-active .timeline__icon {
    animation: none;
    border: 2px solid var(--color-primary-400);
  }

  .timeline__item {
    transition: none;
  }
}