/* =============================================================================
 * components.css — token-driven styling hooks for the component library
 * -----------------------------------------------------------------------------
 * The components' JavaScript lands in later subtasks (task #100513). This file
 * defines the classes and CSS variables those components render into, so the
 * visual contract exists ahead of the behaviour. Everything is coloured from
 * tokens.css — no hard-coded colours.
 * ========================================================================== */

/* -----------------------------------------------------------------------------
 * Buttons (shared control surface, used by forms/modals/toasts)
 * -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: var(--control-height);
  padding: 0 var(--space-4);
  border-radius: var(--control-radius);
  border: var(--border-width) solid transparent;
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  white-space: nowrap;
  transition: background-color var(--transition-fast),
    border-color var(--transition-fast), color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-accent-contrast);
}

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

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

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

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
}

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

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

.btn--sm {
  height: 1.85rem;
  padding: 0 var(--space-3);
  font-size: var(--font-size-sm);
}

.btn--icon {
  width: var(--control-height);
  padding: 0;
}

/* -----------------------------------------------------------------------------
 * Table
 * -------------------------------------------------------------------------- */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: var(--border-width) solid var(--table-border);
  border-radius: var(--card-radius);
  background-color: var(--color-surface);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-md);
}

.table thead th {
  position: sticky;
  top: 0;
  background-color: var(--table-header-bg);
  color: var(--color-muted);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  text-align: left;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-width) solid var(--table-border);
  white-space: nowrap;
}

.table tbody td {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-width) solid var(--table-border);
  color: var(--color-text);
  vertical-align: middle;
}

.table tbody tr:last-child td {
  border-bottom: none;
}

.table tbody tr:hover {
  background-color: var(--table-row-hover);
}

.table--compact tbody td,
.table--compact thead th {
  padding: var(--space-2) var(--space-3);
}

.table__cell--numeric {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* -----------------------------------------------------------------------------
 * Form controls
 * -------------------------------------------------------------------------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

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

.field__hint {
  font-size: var(--font-size-xs);
  color: var(--color-muted);
}

.field__error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
}

.input,
.select,
.textarea {
  width: 100%;
  min-height: var(--control-height);
  padding: 0 var(--control-padding-x);
  background-color: var(--control-bg);
  color: var(--control-text);
  border: var(--border-width) solid var(--control-border);
  border-radius: var(--control-radius);
  transition: border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.textarea {
  min-height: 6rem;
  padding: var(--space-2) var(--control-padding-x);
  resize: vertical;
  line-height: var(--line-height-normal);
}

.input::placeholder,
.textarea::placeholder {
  color: var(--control-placeholder);
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: var(--focus-outline);
}

.input:disabled,
.select:disabled,
.textarea:disabled {
  background-color: var(--color-surface-2);
  color: var(--color-disabled);
  cursor: not-allowed;
}

.field--invalid .input,
.field--invalid .select,
.field--invalid .textarea {
  border-color: var(--color-danger);
}

.select {
  appearance: none;
  padding-right: var(--space-6);
  cursor: pointer;
}

.checkbox,
.radio {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.checkbox input,
.radio input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--color-accent);
}

/* -----------------------------------------------------------------------------
 * Modal
 * -------------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal-backdrop);
  background-color: var(--modal-backdrop);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
}

.modal {
  position: relative;
  z-index: var(--z-modal);
  width: 100%;
  max-width: 32rem;
  max-height: calc(100vh - 2 * var(--space-5));
  display: flex;
  flex-direction: column;
  background-color: var(--modal-bg);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--modal-radius);
  box-shadow: var(--modal-shadow);
  overflow: hidden;
}

.modal--sm { max-width: 24rem; }
.modal--lg { max-width: 48rem; }

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-bottom: var(--border-width) solid var(--color-border);
}

.modal__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading);
}

.modal__body {
  padding: var(--space-5);
  overflow-y: auto;
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: var(--border-width) solid var(--color-border);
  background-color: var(--color-surface-2);
}

/* -----------------------------------------------------------------------------
 * Status label (dot + text — for connection/session/link states)
 * -------------------------------------------------------------------------- */
.status-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.status-label::before {
  content: "";
  width: 0.55em;
  height: 0.55em;
  border-radius: var(--radius-pill);
  background-color: var(--status-color, var(--color-muted));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--status-color, var(--color-muted)) 22%, transparent);
  flex: none;
}

.status-label--success { --status-color: var(--color-success); }
.status-label--warning { --status-color: var(--color-warning); }
.status-label--danger  { --status-color: var(--color-danger); }
.status-label--info    { --status-color: var(--color-info); }
.status-label--neutral { --status-color: var(--color-muted); }

/* -----------------------------------------------------------------------------
 * Badge / chip
 * -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 0.15rem var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  background-color: var(--badge-bg, var(--color-surface-2));
  color: var(--badge-fg, var(--color-text));
}

.badge--success { --badge-bg: var(--color-success-bg); --badge-fg: var(--color-success); }
.badge--warning { --badge-bg: var(--color-warning-bg); --badge-fg: var(--color-warning); }
.badge--danger  { --badge-bg: var(--color-danger-bg);  --badge-fg: var(--color-danger); }
.badge--info    { --badge-bg: var(--color-info-bg);    --badge-fg: var(--color-info); }
.badge--accent  { --badge-bg: var(--color-accent-soft); --badge-fg: var(--color-accent-strong); }

.badge--pill {
  border-radius: var(--radius-pill);
  padding-inline: var(--space-3);
}

/* -----------------------------------------------------------------------------
 * Toast (transient notifications, top-right stack)
 * -------------------------------------------------------------------------- */
.toast-region {
  position: fixed;
  top: var(--space-4);
  right: var(--space-4);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  width: min(24rem, calc(100vw - 2 * var(--space-4)));
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background-color: var(--toast-bg);
  border: var(--border-width) solid var(--color-border);
  border-left: var(--border-width-strong) solid var(--toast-accent, var(--color-accent));
  border-radius: var(--toast-radius);
  box-shadow: var(--toast-shadow);
  color: var(--color-text);
}

.toast--success { --toast-accent: var(--color-success); }
.toast--warning { --toast-accent: var(--color-warning); }
.toast--danger  { --toast-accent: var(--color-danger); }
.toast--info    { --toast-accent: var(--color-info); }

.toast__body { flex: 1 1 auto; min-width: 0; }
.toast__title { font-weight: var(--font-weight-semibold); }
.toast__message { color: var(--color-muted); font-size: var(--font-size-sm); }
.toast__close { color: var(--color-muted); padding: 0 var(--space-1); }

/* -----------------------------------------------------------------------------
 * Empty state
 * -------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: var(--space-3);
  padding: var(--space-7) var(--space-5);
  color: var(--color-muted);
}

.empty-state__icon {
  width: 3rem;
  height: 3rem;
  display: grid;
  place-items: center;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-2);
  color: var(--color-muted);
}

.empty-state__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-heading);
}

.empty-state__message {
  max-width: 32rem;
}

/* -----------------------------------------------------------------------------
 * Theme controller (built by theme.js buildThemeController(); mounted later)
 * -------------------------------------------------------------------------- */
.theme-controller {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-controller__brand {
  height: 2rem;
  padding: 0 var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--color-chrome-text);
  background-color: var(--color-chrome-2);
  border: var(--border-width) solid var(--color-chrome-border);
  border-radius: var(--radius-md);
}

.theme-controller__toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-md);
  color: var(--color-chrome-text);
  background-color: var(--color-chrome-2);
  border: var(--border-width) solid var(--color-chrome-border);
  transition: background-color var(--transition-fast);
}

.theme-controller__toggle:hover {
  background-color: var(--color-chrome-active-bg);
}