/* ============================================================
   COMPONENTS — Buttons, cards, forms, accordion
   ============================================================ */

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 0.75em 1.75em;
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.btn:active {
  transform: translateY(1px);
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  border-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-md);
}

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

.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-primary);
  border-color: transparent;
  padding-inline: var(--space-2);
}

.btn--ghost:hover {
  background-color: var(--color-primary-muted);
}

.btn--warm {
  background-color: var(--color-warm);
  color: #fff;
  border-color: var(--color-warm);
}

.btn--warm:hover {
  background-color: var(--color-warm-dark);
  border-color: var(--color-warm-dark);
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn--lg {
  padding: 1em 2.25em;
  font-size: var(--text-base);
}

.btn--sm {
  padding: 0.5em 1.25em;
  font-size: var(--text-xs);
}

/* Inverse buttons for dark sections */
.section--dark .btn--outline {
  color: var(--color-text-inverse);
  border-color: var(--color-text-inverse);
}

.section--dark .btn--outline:hover {
  background-color: var(--color-text-inverse);
  color: var(--color-accent);
}

/* --- Cards --- */
.card {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  transition:
    box-shadow var(--duration-normal) var(--ease-out),
    border-color var(--duration-normal) var(--ease-out);
}

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

.card--flat {
  border: none;
  box-shadow: none;
  background: transparent;
  padding: 0;
}

.card--flat:hover {
  box-shadow: none;
}

.card--elevated {
  border: none;
  box-shadow: var(--shadow-md);
}

.card--elevated:hover {
  box-shadow: var(--shadow-lg);
}

.card__icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: var(--space-1);
}

.card__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

.card__footer {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-border-light);
}

/* --- Form elements --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.form-group + .form-group {
  margin-top: var(--space-3);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 550;
  color: var(--color-text);
}

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

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.7em 0.9em;
  font-size: var(--text-base);
  background: var(--color-surface-raised);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition:
    border-color var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
}

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

.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 3px var(--color-primary-muted);
  outline: none;
}

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

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' fill='none' stroke='%234a6068' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.9em center;
  padding-right: 2.5em;
}

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

.form-input--error:focus,
.form-textarea--error:focus {
  box-shadow: 0 0 0 3px rgba(155, 44, 44, 0.15);
}

.form-error {
  font-size: var(--text-sm);
  color: var(--color-error);
  font-weight: 500;
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* Radio / checkbox groups */
.form-radio-group {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
}

.form-radio {
  display: flex;
}

.form-radio input[type="radio"] {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.form-radio label {
  padding: 0.5em 1.25em;
  font-size: var(--text-sm);
  font-weight: 550;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.form-radio label:hover {
  border-color: var(--color-primary);
}

.form-radio input[type="radio"]:checked + label {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.form-radio input[type="radio"]:focus-visible + label {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* --- Accordion (details/summary) --- */
.accordion {
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.accordion details {
  border-bottom: 1px solid var(--color-border-light);
}

.accordion details:last-child {
  border-bottom: none;
}

.accordion summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  font-weight: 550;
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--ease-out);
  list-style: none;
}

.accordion summary::-webkit-details-marker {
  display: none;
}

.accordion summary::after {
  content: '';
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-text-muted);
  border-bottom: 2px solid var(--color-text-muted);
  transform: rotate(-45deg);
  transition: transform var(--duration-normal) var(--ease-out);
  flex-shrink: 0;
}

.accordion details[open] summary::after {
  transform: rotate(45deg);
}

.accordion summary:hover {
  background-color: var(--color-surface);
}

.accordion__content {
  padding: 0 var(--space-4) var(--space-4);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2em 0.7em;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  border-radius: var(--radius-full);
  background: var(--color-primary-muted);
  color: var(--color-primary);
}