/*
 * Heyming OS Design Language (HOSDL) — component contract.
 *
 * This file ships the .hos-* classes documented in HOSDL.md. Apps opt in
 * by loading /brand.css first, then this file. All colors, motion, type,
 * and radii come from brand tokens — no literals.
 *
 * The single invariant: app functionality is preserved. These components
 * are the chrome over that functionality.
 */

/* ─── Buttons ──────────────────────────────────────────────────────── */

.hos-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  background: var(--surface-2);
  color: var(--text-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: var(--text-caption);
  font-weight: 600;
  letter-spacing: -0.005em;
  cursor: pointer;
  text-decoration: none;
  transition: background var(--motion-hover), border-color var(--motion-hover),
    color var(--motion-hover), transform var(--motion-hover);
  user-select: none;
}
.hos-button:hover:not(:disabled) {
  background: var(--surface-1);
  border-color: var(--hairline-accent);
}
.hos-button:active:not(:disabled) {
  transform: scale(0.98);
}
.hos-button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.hos-button-primary {
  background: var(--accent-primary-bg);
  color: var(--text-on-accent);
  border-color: transparent;
}
.hos-button-primary:hover:not(:disabled) {
  background: var(--accent-primary-bg-hover);
  border-color: transparent;
}

.hos-button-ghost {
  background: transparent;
  color: var(--accent-primary-hover);
  border-color: transparent;
}
.hos-button-ghost:hover:not(:disabled) {
  background: var(--accent-primary-soft);
  border-color: transparent;
}

.hos-button-danger {
  background: var(--danger);
  color: var(--pure-white);
  border-color: transparent;
}
.hos-button-danger:hover:not(:disabled) {
  background: color-mix(in srgb, var(--danger) 85%, var(--pure-black));
  border-color: transparent;
}

.hos-button-sm {
  padding: 6px 12px;
  font-size: var(--text-micro);
}
.hos-button-lg {
  padding: 14px 24px;
  font-size: var(--text-body);
}

/* ─── Inputs ───────────────────────────────────────────────────────── */

.hos-input,
.hos-textarea,
.hos-select {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface-0);
  color: var(--text-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  font-family: var(--font-ui);
  font-size: var(--text-body);
  line-height: 1.4;
  transition: border-color var(--motion-hover), box-shadow var(--motion-hover);
  outline: none;
  box-sizing: border-box;
}
.hos-textarea {
  resize: vertical;
  min-height: 96px;
  font-family: var(--font-ui);
}
.hos-input::placeholder,
.hos-textarea::placeholder {
  color: var(--text-3);
}
.hos-input:focus,
.hos-textarea:focus,
.hos-select:focus {
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px var(--accent-primary-soft);
}
.hos-input:disabled,
.hos-textarea:disabled,
.hos-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hos-input-mono,
.hos-textarea-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.hos-label {
  display: block;
  font-size: var(--text-micro);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-2);
  margin-bottom: 6px;
}

.hos-field {
  margin-bottom: 16px;
}
.hos-field-hint {
  font-size: var(--text-caption);
  color: var(--text-3);
  margin: 6px 0 0;
}
.hos-field-error {
  font-size: var(--text-caption);
  color: var(--danger);
  margin: 6px 0 0;
}

/* ─── Cards / surfaces ─────────────────────────────────────────────── */

.hos-card {
  background: var(--surface-1);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.hos-card-flush {
  padding: 0;
}
/* .hos-card-glass — kept as a backwards-compat alias. The new
 * heyming-engineering brand has no glass / backdrop-filter, so this
 * paints a solid raised card with the strong hairline. Apps that still
 * reach for the class still get a recognizable card; the visual weight
 * just matches the rest of the chrome. */
.hos-card-glass {
  background: var(--surface-1);
  border: 1px solid var(--hairline-strong);
}

/* ─── App header ───────────────────────────────────────────────────── */

.hos-app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  background: var(--surface-1);
  border-bottom: 1px solid var(--hairline);
  /* Clears the floating back button on standalone pages. */
  padding-left: max(20px, 120px);
}
.hos-app-header-identity {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}
.hos-app-header-identity .app-icon-frame {
  --icon-frame-size: 36px;
}
.hos-app-header-title {
  font-family: var(--font-display);
  font-size: var(--text-h3);
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--text-1);
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hos-app-header-subtitle {
  font-size: var(--text-caption);
  color: var(--text-2);
  margin: 2px 0 0;
}
.hos-app-header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* Compact mode for tight chrome (mobile, narrow popovers). */
.hos-app-header-compact {
  padding: 10px 16px;
  padding-left: max(16px, 100px);
}
.hos-app-header-compact .hos-app-header-title {
  font-size: var(--text-body);
}

/* ─── Toolbar ──────────────────────────────────────────────────────── */

.hos-toolbar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  background: var(--surface-1);
  border-bottom: 1px solid var(--hairline);
  flex-wrap: wrap;
}
.hos-toolbar-separator {
  width: 1px;
  height: 22px;
  background: var(--hairline-strong);
  margin: 0 4px;
}
.hos-toolbar-spacer {
  flex: 1;
}

/* ─── List ─────────────────────────────────────────────────────────── */

.hos-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}
.hos-list-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: var(--text-1);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--motion-hover);
}
.hos-list-item:hover {
  background: var(--accent-primary-soft);
}
.hos-list-item.is-selected {
  background: var(--accent-primary-soft);
  color: var(--accent-primary-hover);
  font-weight: 600;
}
.hos-list-item-divider {
  height: 1px;
  background: var(--hairline);
  margin: 6px 0;
  pointer-events: none;
}

/* ─── Segmented control ────────────────────────────────────────────── */

.hos-segmented {
  display: inline-flex;
  background: var(--surface-2);
  border: 1px solid var(--hairline);
  border-radius: var(--radius);
  padding: 3px;
  gap: 2px;
}
.hos-segmented > button,
.hos-segmented > label {
  appearance: none;
  border: none;
  background: transparent;
  color: var(--text-2);
  font-family: var(--font-ui);
  font-size: var(--text-caption);
  font-weight: 600;
  padding: 6px 14px;
  border-radius: calc(var(--radius) - 4px);
  cursor: pointer;
  transition: background var(--motion-hover), color var(--motion-hover);
}
.hos-segmented > button:hover,
.hos-segmented > label:hover {
  color: var(--text-1);
}
.hos-segmented > .is-active,
.hos-segmented > [aria-checked='true'],
.hos-segmented > [aria-selected='true'],
.hos-segmented > input:checked + label {
  background: var(--accent-primary-bg);
  color: var(--text-on-accent);
}

/* ─── Switch ───────────────────────────────────────────────────────── */

.hos-switch {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  user-select: none;
  color: var(--text-1);
  font-family: var(--font-ui);
  font-size: var(--text-caption);
}
.hos-switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}
.hos-switch-track {
  position: relative;
  display: inline-block;
  width: 36px;
  height: 22px;
  background: var(--surface-2);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius-pill);
  transition: background var(--motion-hover), border-color var(--motion-hover);
  flex-shrink: 0;
}
.hos-switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: var(--text-1);
  border-radius: 50%;
  transition: transform var(--motion-hover);
}
.hos-switch input:checked + .hos-switch-track {
  background: var(--accent-primary-bg);
  border-color: var(--accent-primary);
}
.hos-switch input:checked + .hos-switch-track .hos-switch-thumb {
  transform: translateX(14px);
}
.hos-switch input:focus-visible + .hos-switch-track {
  outline: 2px solid var(--focus-ring-inner);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--focus-ring-outer);
}

/* ─── Scrollbar (component-local opt-in) ───────────────────────────── */

.hos-scrollbar {
  scrollbar-width: thin;
  scrollbar-color: var(--surface-2) var(--surface-0);
}
.hos-scrollbar::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
.hos-scrollbar::-webkit-scrollbar-track {
  background: var(--surface-0);
}
.hos-scrollbar::-webkit-scrollbar-thumb {
  background: var(--surface-2);
  border-radius: var(--radius-pill);
  border: 2px solid var(--surface-0);
}
.hos-scrollbar::-webkit-scrollbar-thumb:hover {
  background: var(--accent-primary);
}

/* ─── Status tag (success / warning / danger / info) ───────────────── */

.hos-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  border: 1px solid var(--hairline);
  background: var(--surface-2);
  color: var(--text-2);
}
.hos-tag-success {
  background: var(--success-soft);
  color: var(--success);
  border-color: color-mix(in srgb, var(--success) 32%, transparent);
}
/* Warning fg falls back to dark text on a pale-yellow tile because
 * --warning (#F29900) is a fill color, not a text color, against the
 * paper-cream surface. */
.hos-tag-warning {
  background: var(--warning-soft);
  color: var(--text-1);
  border-color: color-mix(in srgb, var(--warning) 32%, transparent);
}
.hos-tag-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 32%, transparent);
}
.hos-tag-info {
  background: var(--accent-primary-soft);
  color: var(--accent-primary-hover);
  border-color: var(--hairline-accent);
}

/* ─── Notification toast ───────────────────────────────────────────── */

.hos-notify-region {
  position: fixed;
  top: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 9000;
  pointer-events: none;
  max-width: min(320px, calc(100vw - 40px));
}
.hos-notify {
  pointer-events: auto;
  background: var(--surface-1);
  color: var(--text-1);
  border: 1px solid var(--hairline-strong);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: var(--text-caption);
  box-shadow: var(--shadow-modal);
  animation: hos-notify-in 0.22s ease-out;
  /* Engineering signal: notifications get a left-edge color stripe
   * instead of a soft tint. Mirrors the way GitHub flash messages
   * and HN moderation banners signal severity. */
  border-left-width: 4px;
}
.hos-notify.hos-notify-success {
  border-left-color: var(--success);
}
.hos-notify.hos-notify-danger {
  border-left-color: var(--danger);
}
.hos-notify.hos-notify-warning {
  border-left-color: var(--warning);
}
@keyframes hos-notify-in {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}