/*
 * Onyx UI — components.css
 * All component styles. Requires tokens.css.
 * Zero hardcoded values — all styles use var(--*) references.
 */

/* ─── BUTTON ─────────────────────────────────────────────────────────────────── */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 36px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-btn);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-active, var(--font-family-primary));
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default),
              border-color var(--duration-fast) var(--ease-default),
              opacity var(--duration-fast) var(--ease-default);
  -webkit-appearance: none;
  appearance: none;
  outline: none;
}

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

/* Primary — black/white solid */
.btn--primary {
  background-color: var(--color-foreground);
  color: var(--color-foreground-inverse);
  border-color: transparent;
}
.btn--primary:hover { background-color: var(--color-surface-action-hover); color: var(--color-foreground-on-accent); border-color: transparent; }
.btn--primary:active { opacity: 0.85; }

/* Outline — ghost with subtle border */
.btn--outline {
  background-color: transparent;
  color: var(--color-foreground-muted);
  border-color: var(--color-border);
}
.btn--outline:hover { background-color: var(--color-surface-muted); color: var(--color-foreground); border-color: var(--color-border-strong); }
.btn--outline:active { opacity: 0.8; }

/* Ghost — no border, no background */
.btn--ghost {
  background-color: transparent;
  color: var(--color-foreground-muted);
  border-color: transparent;
}
.btn--ghost:hover { background-color: var(--color-surface-muted); color: var(--color-foreground); border-color: transparent; }
.btn--ghost:active { opacity: 0.8; }

/* Accent — brand color fill */
.btn--accent {
  background-color: var(--color-brand-accent);
  color: var(--color-foreground-on-accent);
  border-color: transparent;
}
.btn--accent:hover { background-color: var(--color-brand-accent-hover); color: var(--color-foreground-on-accent); border-color: transparent; }
.btn--accent:active { opacity: 0.9; }

/* Nav link — text only, uppercase, hover underline */
.btn--nav {
  background: transparent;
  border-color: transparent;
  color: var(--color-foreground-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  padding: 0 var(--space-2);
  height: auto;
}
.btn--nav:hover { background: transparent; color: var(--color-foreground); border-color: transparent; text-decoration: underline; }

/* Sizes */
.btn--sm { height: 28px; padding: 0 var(--space-3); font-size: var(--font-size-xs); }
.btn--lg { height: 44px; padding: 0 var(--space-6); font-size: var(--font-size-base); }
.btn--xs { height: 24px; padding: 0 var(--space-3); font-size: var(--font-size-xs); border-radius: var(--radius-full); }

/* Icon button — circular, fixed size */
.btn--icon {
  padding: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
}
.btn--icon.btn--sm  { width: 28px; height: 28px; }
.btn--icon.btn--lg  { width: 44px; height: 44px; }
.btn--icon.btn--xs  { width: 24px; height: 24px; }

/* Loading state — spinner */
.btn.is-loading {
  color: transparent;
  pointer-events: none;
  position: relative;
}
.btn.is-loading::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid currentColor;
  border-top-color: transparent;
  border-radius: var(--radius-full);
  animation: btn-spin 0.7s linear infinite;
  color: var(--color-foreground-muted);
}
@keyframes btn-spin { to { transform: rotate(360deg); } }

/* Disabled */
.btn:disabled, .btn[aria-disabled="true"] {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* Full-width (§15: use width:100%, not flex:1) */
.btn--full { width: 100%; }

/* With leading icon */
.btn svg { flex-shrink: 0; }

/* ─── ICON BUTTON SIZES (pill, source: theme toggle, preset) */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border-strong);
  background-color: var(--color-surface-raised);
  color: var(--color-foreground);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default);
  flex-shrink: 0;
}
.icon-btn:hover { background-color: var(--color-surface-muted); color: var(--color-foreground); }
.icon-btn:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: 2px; }
.icon-btn--sm { width: 28px; height: 28px; }
.icon-btn--lg { width: 40px; height: 40px; }

/* ─── TABS (segmented grid style) ───────────────────────────────────────────── */

.tabs {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.tabs__list {
  display: grid;
  gap: 4px;
  background-color: var(--color-tab-container);
  border-radius: var(--radius-lg);
  padding: 4px;
  border: 1px solid var(--color-border);
}

.tabs__list--2 { grid-template-columns: 1fr 1fr; }
.tabs__list--3 { grid-template-columns: 1fr 1fr 1fr; }
.tabs__list--4 { grid-template-columns: 1fr 1fr 1fr 1fr; }

.tabs__trigger {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-3);
  height: 32px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-active, var(--font-family-primary));
  color: var(--color-tab-inactive-text);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default);
  white-space: nowrap;
}
.tabs__trigger:hover { color: var(--color-foreground); }
.tabs__trigger.is-active, .tabs__trigger[aria-selected="true"] {
  background-color: var(--color-tab-active);
  color: var(--color-tab-active-text);
  box-shadow: var(--shadow-xs);
}
.tabs__trigger:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: -2px; }

.tabs__panel { display: none; }
.tabs__panel.is-active { display: block; }

/* ─── TOGGLE GROUP (radio-style, single and multi-select) ───────────────────── */

.toggle-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.toggle-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  padding: 0 var(--space-3);
  border-radius: var(--radius-btn);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family-active, var(--font-family-primary));
  color: var(--color-foreground-muted);
  background: transparent;
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-default),
              color var(--duration-fast) var(--ease-default),
              border-color var(--duration-fast) var(--ease-default);
  white-space: nowrap;
}
.toggle-btn:hover { background-color: var(--color-surface-muted); color: var(--color-foreground); }
.toggle-btn.is-active, .toggle-btn[aria-pressed="true"] {
  background-color: var(--color-surface-raised);
  color: var(--color-foreground);
  border-color: transparent;
}
.toggle-btn:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: 2px; }

/* ─── CONTROL SECTION (label row + control) ──────────────────────────────────── */

.control-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}
.control-section:last-child { border-bottom: none; }

.control-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
}

.control-label__name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-foreground-muted);
}

.control-label__value {
  font-size: var(--font-size-xs);
  color: var(--color-foreground-muted);
  font-variant-numeric: tabular-nums;
  min-width: 24px;
  text-align: right;
}

/* ─── SLIDER (range input) ───────────────────────────────────────────────────── */

.slider-wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  border-radius: var(--radius-full);
  background: var(--color-surface-muted);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--color-foreground);
  border: 2px solid var(--color-background);
  box-shadow: var(--shadow-sm);
  cursor: grab;
  transition: transform var(--duration-fast) var(--ease-default);
}
.slider::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.2); }

.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: var(--color-foreground);
  border: 2px solid var(--color-background);
  box-shadow: var(--shadow-sm);
  cursor: grab;
}

.slider:focus-visible::-webkit-slider-thumb {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Track fill (progress) via linear-gradient — updated by JS */
.slider[data-filled] {
  background: linear-gradient(
    to right,
    var(--color-foreground) 0%,
    var(--color-foreground) var(--slider-fill, 50%),
    var(--color-surface-muted) var(--slider-fill, 50%),
    var(--color-surface-muted) 100%
  );
}

/* ─── SWATCH PICKER (color palette grid) ─────────────────────────────────────── */

.swatch-picker {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.swatch-picker__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(26px, 1fr));
  gap: var(--space-1);
}

.swatch {
  width: 26px;
  height: 26px;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-default),
              border-color var(--duration-fast) var(--ease-default);
  position: relative;
  flex-shrink: 0;
}
.swatch:hover { transform: scale(1.1); }
.swatch.is-active {
  border-color: var(--color-foreground);
  transform: scale(1.05);
}
.swatch.is-active::after {
  content: '';
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23fff' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size: 14px;
  background-repeat: no-repeat;
  background-position: center;
  border-radius: calc(var(--radius-md) - 2px);
  background-color: rgba(0,0,0,0.25);
}
.swatch:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* ─── SIDEBAR PANEL (tool sidebar layout) ────────────────────────────────────── */

.sidebar-panel {
  display: flex;
  flex-direction: column;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  width: var(--sidebar-width);
  min-height: 100vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--color-surface-muted) transparent;
}

.sidebar-panel__section {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}
.sidebar-panel__section:last-child { border-bottom: none; }

.sidebar-panel__section-label {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground-muted);
  margin-bottom: var(--space-3);
  letter-spacing: var(--letter-spacing-wide);
}

/* ─── CARD ───────────────────────────────────────────────────────────────────── */

.card {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: border-color var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
}

.card--hoverable:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

.card__header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5) var(--space-2);
}

.card__title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-foreground);
  margin: 0 0 var(--space-1);
  line-height: var(--line-height-tight);
}

.card__subtitle {
  font-size: var(--font-size-xs);
  color: var(--color-foreground-muted);
  margin: 0;
  line-height: var(--line-height-normal);
}

.card__body {
  padding: 0 var(--space-5) var(--space-4);
}

.card__media {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: cover;
  background-color: var(--color-surface-muted);
  display: block;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.card__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-surface-overlay);
  color: var(--color-foreground-muted);
  cursor: pointer;
  flex-shrink: 0;
  font-size: var(--font-size-sm);
  line-height: 1;
  transition: background-color var(--duration-fast) var(--ease-default);
}
.card__close:hover { background-color: var(--color-surface-muted); color: var(--color-foreground); }

/* ─── BADGE / TAG ────────────────────────────────────────────────────────────── */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  height: 22px;
  padding: 0 var(--space-2);
  border-radius: var(--radius-badge);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  letter-spacing: var(--letter-spacing-wide);
  white-space: nowrap;
  background-color: var(--color-surface-muted);
  color: var(--color-foreground-muted);
  border: 1px solid var(--color-border);
}

/* Uppercase tag style */
.badge--tag {
  text-transform: uppercase;
  letter-spacing: var(--letter-spacing-widest);
  font-size: var(--font-size-micro);
  font-weight: var(--font-weight-semibold);
  border-radius: var(--radius-sm);
}

.badge--accent {
  background-color: var(--color-brand-accent-subtle);
  color: var(--color-brand-accent);
  border-color: var(--color-brand-accent-subtle);
}

.badge--outline {
  background: transparent;
  border-color: var(--color-border-strong);
  color: var(--color-foreground);
}

.badge--success { background-color: var(--color-success-subtle); color: var(--color-success); border-color: transparent; }
.badge--warning { background-color: var(--color-warning-subtle); color: var(--color-warning); border-color: transparent; }
.badge--error   { background-color: var(--color-error-subtle);   color: var(--color-error);   border-color: transparent; }
.badge--info    { background-color: var(--color-info-subtle);    color: var(--color-info);    border-color: transparent; }

/* ─── INPUT ──────────────────────────────────────────────────────────────────── */

.input-wrap { display: flex; flex-direction: column; gap: var(--space-2); }

.input-label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
}

.input {
  height: 36px;
  width: 100%;
  padding: 0 var(--space-3);
  border-radius: var(--radius-input);
  border: 1px solid var(--color-border-strong);
  background-color: var(--color-surface);
  color: var(--color-foreground);
  font-family: var(--font-family-active, var(--font-family-primary));
  font-size: var(--font-size-sm);
  outline: none;
  transition: border-color var(--duration-fast) var(--ease-default),
              box-shadow var(--duration-fast) var(--ease-default);
  -webkit-appearance: none;
  appearance: none;
}
.input::placeholder { color: var(--color-foreground-muted); }
.input:focus { border-color: var(--color-border-focus); box-shadow: 0 0 0 3px var(--color-brand-accent-subtle); }
.input:disabled { opacity: 0.5; cursor: not-allowed; }
.input.is-error  { border-color: var(--color-error); }
.input.is-error:focus { box-shadow: 0 0 0 3px var(--color-error-subtle); }
.input.is-success { border-color: var(--color-success); }
.input.is-success:focus { box-shadow: 0 0 0 3px var(--color-success-subtle); }

.input--textarea { height: auto; padding: var(--space-3); resize: vertical; min-height: 80px; }
.input--select { padding-right: var(--space-8); background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23999' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right var(--space-3) center; background-size: 14px; }

.input-hint {
  font-size: var(--font-size-xs);
  color: var(--color-foreground-muted);
  margin: 0;
}

/* ─── NAVIGATION BAR ─────────────────────────────────────────────────────────── */

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
  padding: 0 var(--space-4);
  background-color: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
  gap: var(--space-4);
}

.nav-bar__wordmark {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: var(--letter-spacing-wide);
  color: var(--color-foreground);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.nav-bar__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-bar__link {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-normal);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--color-foreground-secondary);
  text-decoration: none;
  padding: var(--space-1) var(--space-2);
  transition: color var(--duration-fast) var(--ease-default);
}
.nav-bar__link:hover { color: var(--color-foreground); text-decoration: underline; }

.nav-bar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ─── TOAST ──────────────────────────────────────────────────────────────────── */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-lg);
  min-width: 280px;
  max-width: 360px;
  pointer-events: all;
  opacity: 0;
  transform: translateX(100%);
  transition: opacity var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}
.toast.is-visible { opacity: 1; transform: translateX(0); }
.toast.is-leaving { opacity: 0; transform: translateX(100%); }

.toast__icon {
  font-size: var(--font-size-sm);
  flex-shrink: 0;
  margin-top: 2px;
}

.toast__content { flex: 1; min-width: 0; }
.toast__title { font-size: var(--font-size-sm); font-weight: var(--font-weight-semibold); color: var(--color-foreground); margin: 0 0 2px; }
.toast__message { font-size: var(--font-size-xs); color: var(--color-foreground-muted); margin: 0; }

.toast__close {
  background: none;
  border: none;
  padding: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-foreground-muted);
  cursor: pointer;
  flex-shrink: 0;
  font-size: var(--font-size-base);
  border-radius: var(--radius-sm);
}
.toast__close:hover { color: var(--color-foreground); background-color: var(--color-surface-muted); }

.toast--success { border-left: 3px solid var(--color-success); }
.toast--error   { border-left: 3px solid var(--color-error); }
.toast--warning { border-left: 3px solid var(--color-warning); }
.toast--info    { border-left: 3px solid var(--color-info); }

/* ─── MODAL ──────────────────────────────────────────────────────────────────── */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--color-surface-overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  padding: var(--space-6);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-default);
}
.modal-overlay.is-open { opacity: 1; pointer-events: all; }

.modal {
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-xl);
  width: 100%;
  max-width: 480px;
  transform: translateY(16px) scale(0.98);
  transition: transform var(--duration-normal) var(--ease-out);
}
.modal-overlay.is-open .modal { transform: translateY(0) scale(1); }

.modal__header { padding: var(--space-6) var(--space-6) var(--space-4); }
.modal__title  { font-size: var(--font-size-base); font-weight: var(--font-weight-semibold); color: var(--color-foreground); margin: 0 0 var(--space-1); }
.modal__subtitle { font-size: var(--font-size-xs); color: var(--color-foreground-muted); margin: 0; }
.modal__body   { padding: 0 var(--space-6) var(--space-4); font-size: var(--font-size-sm); color: var(--color-foreground); }
.modal__footer { display: flex; align-items: center; justify-content: flex-end; gap: var(--space-3); padding: var(--space-4) var(--space-6) var(--space-6); border-top: 1px solid var(--color-border); }

/* ─── ACCORDION ──────────────────────────────────────────────────────────────── */

.accordion { border: 1px solid var(--color-border); border-radius: var(--radius-card); overflow: hidden; }

.accordion__item { border-bottom: 1px solid var(--color-border); }
.accordion__item:last-child { border-bottom: none; }

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-4) var(--space-5);
  background: none;
  border: none;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-foreground);
  font-family: var(--font-family-active, var(--font-family-primary));
  text-align: left;
  cursor: pointer;
  gap: var(--space-4);
  transition: background-color var(--duration-fast) var(--ease-default);
}
.accordion__trigger:hover { background-color: var(--color-surface-muted); }
.accordion__trigger:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: -2px; }

.accordion__icon {
  flex-shrink: 0;
  color: var(--color-foreground-muted);
  transition: transform var(--duration-normal) var(--ease-default);
}
.accordion__item.is-open .accordion__icon { transform: rotate(180deg); }

.accordion__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--duration-normal) var(--ease-default);
}
.accordion__item.is-open .accordion__panel { grid-template-rows: 1fr; }
.accordion__panel-inner { overflow: hidden; }
.accordion__body {
  padding: 0 var(--space-5) var(--space-5);
  font-size: var(--font-size-sm);
  color: var(--color-foreground-muted);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* ─── SKELETON ───────────────────────────────────────────────────────────────── */

@keyframes shimmer {
  0%   { background-position: -200% 0; }
  100% { background-position:  200% 0; }
}

.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-surface-muted) 25%,
    var(--color-surface-raised) 50%,
    var(--color-surface-muted) 75%
  );
  background-size: 200% 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton--text    { height: 14px; border-radius: var(--radius-sm); }
.skeleton--heading { height: 20px; border-radius: var(--radius-sm); }
.skeleton--btn     { height: 36px; border-radius: var(--radius-btn); }
.skeleton--img     { aspect-ratio: 16/9; border-radius: var(--radius-card); }
.skeleton--circle  { border-radius: var(--radius-full); }

/* ─── DIVIDER ────────────────────────────────────────────────────────────────── */

.divider {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 0;
}
.divider--strong { border-top-color: var(--color-border-strong); }
.divider--accent { border-top-color: var(--color-brand-accent); border-top-width: 2px; }

/* ─── UPLOAD ZONE (dashed border, transparent bg — §10) ─────────────────────── */

.upload-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-8) var(--space-6);
  border: 2px dashed var(--color-border-strong);
  border-radius: var(--radius-card);
  background: transparent;
  cursor: pointer;
  text-align: center;
  transition: border-color var(--duration-fast) var(--ease-default),
              background-color var(--duration-fast) var(--ease-default);
}
.upload-zone:hover { border-color: var(--color-foreground-muted); background-color: var(--color-surface-overlay); }
.upload-zone.is-dragging { border-color: var(--color-brand-accent); background-color: var(--color-brand-accent-subtle); }

.upload-zone__icon { color: var(--color-foreground-muted); }
.upload-zone__title { font-size: var(--font-size-sm); font-weight: var(--font-weight-medium); color: var(--color-foreground); margin: 0; }
.upload-zone__hint  { font-size: var(--font-size-xs); color: var(--color-foreground-muted); margin: 0; }