/* ============================================================
   Daily Calculator — forms.css
   Inputs, selects, buttons, validation messages
   ============================================================ */

/* ---------- Field groups ---------- */
.field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.field:last-child { margin-bottom: 0; }

.field__label {
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  color: var(--color-text);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.field__label .optional {
  font-weight: var(--fw-normal);
  color: var(--color-text-muted);
  font-size: var(--fs-xs);
}

.field__hint {
  font-size: var(--fs-xs);
  color: var(--color-text-muted);
  line-height: var(--lh-base);
}

.field__error {
  font-size: var(--fs-xs);
  color: var(--color-error);
  font-weight: var(--fw-medium);
  display: none;
  align-items: center;
  gap: var(--space-1);
}

.field[data-invalid="true"] .field__error {
  display: inline-flex;
}

/* ---------- Text/number inputs ---------- */
.input,
.select,
.textarea {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  color: var(--color-text);
  line-height: 1.4;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  min-height: 48px;
}

.input:focus,
.select:focus,
.textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(23, 105, 232, 0.15);
}

.input:hover,
.select:hover,
.textarea:hover {
  border-color: var(--color-border-strong);
}

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

.input[readonly] {
  background: var(--color-bg-subtle);
  cursor: default;
}

.input[aria-invalid="true"],
.select[aria-invalid="true"] {
  border-color: var(--color-error);
  background: var(--color-error-bg);
}

.input[aria-invalid="true"]:focus,
.select[aria-invalid="true"]:focus {
  box-shadow: 0 0 0 3px rgba(196, 36, 28, 0.15);
}

.textarea {
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: var(--fs-sm);
  line-height: var(--lh-base);
}

/* ---------- Select ---------- */
.select {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23637083' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%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: 16px;
  padding-right: var(--space-10);
  cursor: pointer;
}

/* ---------- Input group (number + unit) ---------- */
.input-group {
  display: flex;
  align-items: stretch;
  gap: 0;
  width: 100%;
}

.input-group .input {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: none;
  flex: 1 1 auto;
}

.input-group .input:focus {
  z-index: 1;
}

.input-group__suffix {
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-3);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-left: none;
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
  font-weight: var(--fw-medium);
}

.input-group--prefix .input {
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  border-right: 1px solid var(--color-border);
  border-left: none;
}

.input-group__prefix {
  display: inline-flex;
  align-items: center;
  padding-inline: var(--space-3);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-right: none;
  border-radius: var(--radius-md) 0 0 var(--radius-md);
  font-size: var(--fs-sm);
  color: var(--color-text-muted);
  font-weight: var(--fw-medium);
}

/* ---------- Radio / checkbox ---------- */
.radio-group,
.checkbox-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  border: none;
}

.radio-group--stack,
.checkbox-group--stack {
  flex-direction: column;
  gap: var(--space-1);
}

.choice {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: var(--fs-sm);
  min-height: 44px;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast);
  user-select: none;
}

.choice:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-border-strong);
}

.choice input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.choice__dot {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border-strong);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--transition-fast);
}

.choice__dot::after {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-primary);
  transform: scale(0);
  transition: transform var(--transition-fast);
}

.choice input:checked + .choice__dot {
  border-color: var(--color-primary);
}

.choice input:checked + .choice__dot::after {
  transform: scale(1);
}

.choice:has(input:checked) {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  color: var(--color-primary-dark);
  font-weight: var(--fw-medium);
}

.choice input:focus-visible + .choice__dot {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

.choice__box {
  width: 18px;
  height: 18px;
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-xs);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.choice__box svg {
  width: 12px;
  height: 12px;
  color: var(--color-white);
  transform: scale(0);
  transition: transform var(--transition-fast);
}

.choice input:checked + .choice__box {
  background: var(--color-primary);
  border-color: var(--color-primary);
}

.choice input:checked + .choice__box svg {
  transform: scale(1);
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              border-color var(--transition-fast),
              color var(--transition-fast),
              box-shadow var(--transition-fast);
  min-height: 48px;
  white-space: nowrap;
  user-select: none;
}

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

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
}

.btn--secondary {
  background: var(--color-white);
  color: var(--color-primary-dark);
  border-color: var(--color-border);
}

.btn--secondary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary);
  text-decoration: none;
}

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

.btn--ghost:hover {
  background: var(--color-bg-subtle);
  text-decoration: none;
}

.btn--danger {
  background: var(--color-error);
  color: var(--color-white);
  border-color: var(--color-error);
}

.btn--danger:hover {
  background: #A81C15;
  border-color: #A81C15;
  text-decoration: none;
}

.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-sm);
  min-height: 40px;
}

.btn--lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--fs-md);
  min-height: 56px;
}

.btn--block {
  width: 100%;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- Button group ---------- */
.btn-group {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.btn-group--split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

@media (min-width: 480px) {
  .btn-group--split { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.btn-group--full {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .btn-group--full { grid-template-columns: auto auto; }
}

/* ---------- Segmented control ---------- */
.segmented {
  display: inline-flex;
  padding: 3px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.segmented input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.segmented label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text-muted);
  cursor: pointer;
  min-height: 40px;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  user-select: none;
}

.segmented input:checked + label {
  background: var(--color-white);
  color: var(--color-primary-dark);
  box-shadow: var(--shadow-xs);
  font-weight: var(--fw-semibold);
}

.segmented input:focus-visible + label {
  outline: var(--focus-outline);
  outline-offset: 2px;
}