/* ═══════════════════════════════════════════════════════════════════════════
   EVIDENT — Shared Form System
   Inputs, textareas, selects, checkboxes, radios, labels, and error states.
   All form elements pass WCAG 2.1 AA — labels required, errors linked via
   aria-describedby, visible focus rings, sufficient contrast.
   Tokens sourced from /assets/css/tokens.css.
   ═══════════════════════════════════════════════════════════════════════════ */

/* ── Form layout ────────────────────────────────────────────── */
.form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

/* ── Labels ─────────────────────────────────────────────────── */
.form-label {
  font-size: var(--type-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

.form-label--required::after {
  content: " *";
  color: var(--color-ruby);
}

/* ── Text inputs, textareas, selects ────────────────────────── */
.form-input,
.form-textarea,
.form-select {
  background: var(--surface-base);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: var(--type-base);
  padding: 0.6rem 0.75rem;
  transition:
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.form-input:disabled,
.form-textarea:disabled,
.form-select:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.form-textarea {
  min-height: 6rem;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 4.5L6 7.5L9 4.5' fill='none' stroke='%235a6080' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2.25rem;
}

/* ── Error state ────────────────────────────────────────────── */
.form-input--error,
.form-textarea--error,
.form-select--error {
  border-color: var(--color-ruby);
}

.form-input--error:focus,
.form-textarea--error:focus,
.form-select--error:focus {
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-ruby) 20%, transparent);
}

.form-error {
  font-size: var(--type-xs);
  color: var(--color-ruby);
  margin: 0;
}

/* ── Hint text ──────────────────────────────────────────────── */
.form-hint {
  font-size: var(--type-xs);
  color: var(--color-text-muted);
  margin: 0;
}

/* ── Checkbox + Radio ───────────────────────────────────────── */
.form-check {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.form-check__input {
  appearance: none;
  width: 1.125rem;
  height: 1.125rem;
  border: 2px solid var(--border-strong);
  border-radius: 3px;
  background: var(--surface-card-solid);
  cursor: pointer;
  flex-shrink: 0;
  margin-top: 0.1rem;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.form-check__input:checked {
  background: var(--color-primary);
  border-color: var(--color-primary);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M2.5 6L5 8.5L9.5 3.5' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.form-check__input[type="radio"] {
  border-radius: var(--radius-full);
}

.form-check__input[type="radio"]:checked {
  background-image: none;
  box-shadow: inset 0 0 0 3px var(--surface-card-solid);
}

.form-check__input:focus-visible {
  outline: 3px solid var(--color-primary-light);
  outline-offset: 2px;
}

.form-check__label {
  font-size: var(--type-base);
  color: var(--color-text);
  cursor: pointer;
}

/* ── Alert boxes ────────────────────────────────────────────── */
.form-alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--type-sm);
  margin-block-end: 1rem;
}

.form-alert--error {
  background: color-mix(in srgb, var(--color-ruby) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-ruby) 40%, transparent);
  color: var(--color-ruby);
}

.form-alert--success {
  background: color-mix(in srgb, var(--color-emerald) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-emerald) 40%, transparent);
  color: var(--color-emerald);
}

.form-alert--info {
  background: color-mix(in srgb, var(--color-primary) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--color-primary) 40%, transparent);
  color: var(--color-primary);
}

/* ── Monospace input variant ────────────────────────────────── */
.form-input--mono {
  font-family: var(--font-mono);
  font-size: var(--type-sm);
  letter-spacing: 0.02em;
}

/* ── Reduced motion ─────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .form-input,
  .form-textarea,
  .form-select,
  .form-check__input {
    transition: none;
  }
}