/* ================================================================== */
/* 4. SHARED UI PRIMITIVES                                             */
/* ================================================================== */

/* Shared chrome for compact app controls. */
.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group input[type="file"],
.form-group select,
.form-group textarea {
  box-sizing: border-box;
  padding: var(--sp-2) var(--sp-3);
  background: var(--c-surface);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="url"],
.form-group input[type="file"],
.form-group select,
.form-group textarea {
  border: var(--border-width) solid var(--c-border-strong);
  border-radius: var(--radius-sm);
}

.form-group input[type="text"]:focus,
.form-group input[type="email"]:focus,
.form-group input[type="url"]:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--c-link);
  box-shadow: var(--focus-ring);
}

.filter-menu summary,
.user-menu summary,
.message-card summary {
  list-style: none;
  cursor: pointer;
}

.filter-menu summary::-webkit-details-marker,
.user-menu summary::-webkit-details-marker,
.message-card summary::-webkit-details-marker {
  display: none;
}

/* ================================================================== */
/* 4a. BUTTONS                                                         */
/* ================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  min-height: var(--size-touch);
  padding: 0 var(--sp-4);
  border: var(--border-width) solid var(--c-border-strong);
  border-radius: var(--radius-field);
  background: var(--c-surface);
  color: var(--c-text);
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: none;
}

.btn:hover,
.btn-primary:hover:not(:disabled),
.btn-secondary:hover {
  background: var(--c-surface-hover);
  text-decoration: none;
}

.btn-primary {
  border-color: var(--c-link);
  color: var(--c-surface);
  background: var(--c-link);
}

.btn-primary:hover:not(:disabled) {
  background: var(--c-link-deep);
}

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

.btn-secondary:hover {
  background: var(--c-surface-soft);
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-sm {
  min-height: var(--size-md);
  padding: 0 var(--sp-3);
  font-size: var(--fs-xs);
}

.btn-link {
  background: none;
  border: none;
  padding: 0;
  font-size: var(--fs-base);
  color: var(--c-link);
  cursor: pointer;
}
.btn-link:hover { text-decoration: underline; }

.btn-danger-link { color: var(--c-error); }
.btn-danger-link:hover { color: var(--status-red-fg); }