/**
 * MSIQ Form Component Library
 * --------------------------------
 * Modern, design-system-matched form styles for Main Street IQ.
 * Single-step and multi-step patterns supported.
 *
 * Tokens used (defined in styles.css):
 *   --color-midnight, --color-navy, --color-sky, --color-neutral,
 *   --color-border, --color-ice, --color-dark-text, --color-navy-hover,
 *   --color-error, --color-success, --font-body, --container-narrow
 *
 * Usage: include this CSS file AFTER styles.css.
 * Pair with assets/js/forms.js for multi-step state management.
 *
 * Last reviewed: 2026-05-21
 */

/* ============================================================
   1. Form container + layout
   ============================================================ */

.msiq-form {
  font-family: var(--font-body);
  color: var(--color-dark-text);
  max-width: 640px;
  width: 100%;
  margin: 0 auto;
  padding: 0;
}

.msiq-form--wide {
  max-width: 800px;
}

.msiq-form__intro {
  margin-bottom: 2rem;
}

.msiq-form__intro h2 {
  font-weight: 500;
  color: var(--color-midnight);
  font-size: 1.6rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.2px;
}

.msiq-form__intro p {
  color: var(--color-neutral);
  font-weight: 300;
  line-height: 1.6;
  margin: 0;
}

/* ============================================================
   2. Progress indicator (multi-step only)
   ============================================================ */

.msiq-form__progress {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.msiq-form__progress-bar {
  flex: 1;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}

.msiq-form__progress-fill {
  height: 100%;
  background: var(--color-navy);
  transition: width 0.3s ease;
  width: 0;
}

.msiq-form__progress-label {
  font-size: 0.85rem;
  color: var(--color-neutral);
  font-weight: 400;
  white-space: nowrap;
  letter-spacing: 0.2px;
}

/* ============================================================
   3. Step container
   ============================================================ */

.msiq-form__step {
  display: none;
  animation: msiq-form-step-in 0.3s ease;
}

.msiq-form__step--active {
  display: block;
}

@keyframes msiq-form-step-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.msiq-form__step-title {
  font-weight: 500;
  color: var(--color-midnight);
  font-size: 1.25rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.1px;
  line-height: 1.3;
}

.msiq-form__step-subtitle {
  color: var(--color-neutral);
  font-weight: 300;
  line-height: 1.6;
  margin: 0 0 1.5rem;
  font-size: 1rem;
}

/* ============================================================
   4. Field group (label + input + help/error)
   ============================================================ */

.msiq-form__field {
  margin-bottom: 1.5rem;
}

.msiq-form__field--inline-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

@media (max-width: 640px) {
  .msiq-form__field--inline-pair {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

.msiq-form__label {
  display: block;
  font-weight: 500;
  color: var(--color-midnight);
  font-size: 0.95rem;
  margin-bottom: 0.5rem;
  letter-spacing: 0.1px;
}

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

.msiq-form__help {
  font-size: 0.85rem;
  color: var(--color-neutral);
  margin-top: 0.4rem;
  line-height: 1.4;
}

.msiq-form__error {
  font-size: 0.85rem;
  color: var(--color-error);
  margin-top: 0.4rem;
  line-height: 1.4;
  display: none;
}

.msiq-form__field--invalid .msiq-form__error {
  display: block;
}

/* ============================================================
   5. Inputs
   ============================================================ */

.msiq-form__input,
.msiq-form__textarea,
.msiq-form__select {
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 300;
  color: var(--color-dark-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  box-sizing: border-box;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  outline: none;
}

.msiq-form__input::placeholder,
.msiq-form__textarea::placeholder {
  color: var(--color-neutral);
  opacity: 0.7;
}

.msiq-form__input:hover,
.msiq-form__textarea:hover,
.msiq-form__select:hover {
  border-color: var(--color-neutral);
}

.msiq-form__input:focus,
.msiq-form__textarea:focus,
.msiq-form__select:focus {
  border-color: var(--color-navy);
  box-shadow: 0 0 0 3px rgba(43, 78, 140, 0.12);
}

.msiq-form__field--invalid .msiq-form__input,
.msiq-form__field--invalid .msiq-form__textarea,
.msiq-form__field--invalid .msiq-form__select {
  border-color: var(--color-error);
}

.msiq-form__textarea {
  min-height: 120px;
  resize: vertical;
  font-family: var(--font-body);
  line-height: 1.5;
}

.msiq-form__select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1.5L6 6.5L11 1.5' stroke='%236B7480' stroke-width='1.5' fill='none' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
  cursor: pointer;
}

/* Honeypot (anti-spam) */
.msiq-form__honeypot {
  position: absolute;
  left: -9999px;
  height: 0;
  width: 0;
  opacity: 0;
  pointer-events: none;
}

/* ============================================================
   6. Radio + checkbox groups (card-style choices)
   ============================================================ */

.msiq-form__choice-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.msiq-form__choice-group--grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

.msiq-form__choice {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.9rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  cursor: pointer;
  background: var(--color-white);
  transition: border-color 0.15s ease, background 0.15s ease;
}

.msiq-form__choice:hover {
  border-color: var(--color-neutral);
  background: var(--color-ice);
}

.msiq-form__choice input[type="radio"],
.msiq-form__choice input[type="checkbox"] {
  margin: 0;
  margin-top: 0.2rem;
  flex-shrink: 0;
  accent-color: var(--color-navy);
  cursor: pointer;
}

.msiq-form__choice input[type="radio"]:checked + .msiq-form__choice-label,
.msiq-form__choice input[type="checkbox"]:checked + .msiq-form__choice-label {
  color: var(--color-midnight);
  font-weight: 500;
}

.msiq-form__choice:has(input:checked) {
  border-color: var(--color-navy);
  background: rgba(91, 184, 255, 0.06);
}

.msiq-form__choice-label {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--color-dark-text);
  line-height: 1.4;
  cursor: pointer;
  user-select: none;
}

.msiq-form__choice-label-sub {
  display: block;
  font-size: 0.85rem;
  color: var(--color-neutral);
  font-weight: 300;
  margin-top: 0.2rem;
  line-height: 1.4;
}

/* ============================================================
   7. Buttons (Next, Back, Submit)
   ============================================================ */

.msiq-form__buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 2rem;
}

.msiq-form__buttons--end {
  justify-content: flex-end;
}

.msiq-form__btn {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  border: none;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
  letter-spacing: 0.2px;
}

.msiq-form__btn--primary {
  background: var(--color-navy);
  color: var(--color-white);
}

.msiq-form__btn--primary:hover:not(:disabled) {
  background: var(--color-navy-hover);
  transform: translateY(-1px);
}

.msiq-form__btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

.msiq-form__btn--secondary {
  background: transparent;
  color: var(--color-neutral);
  border: 1px solid var(--color-border);
}

.msiq-form__btn--secondary:hover:not(:disabled) {
  color: var(--color-dark-text);
  border-color: var(--color-neutral);
}

.msiq-form__btn--secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================================
   8. Success state (post-submit)
   ============================================================ */

.msiq-form__success {
  display: none;
  text-align: center;
  padding: 2rem 1rem;
}

.msiq-form__success--active {
  display: block;
}

.msiq-form__success-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  color: var(--color-success);
}

.msiq-form__success-title {
  font-weight: 500;
  color: var(--color-midnight);
  font-size: 1.4rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.1px;
}

.msiq-form__success-body {
  color: var(--color-neutral);
  font-weight: 300;
  line-height: 1.6;
  margin: 0;
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================================
   9. Loading / submit state
   ============================================================ */

.msiq-form__btn--loading {
  position: relative;
  color: transparent !important;
  pointer-events: none;
}

.msiq-form__btn--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-white);
  border-radius: 50%;
  animation: msiq-form-spin 0.6s linear infinite;
}

@keyframes msiq-form-spin {
  to {
    transform: rotate(360deg);
  }
}

/* ============================================================
   10. Inline form variants (e.g., footer newsletter, hero CTA)
   ============================================================ */

.msiq-form--inline {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
  margin: 0;
}

.msiq-form--inline .msiq-form__field {
  flex: 1;
  margin-bottom: 0;
}

.msiq-form--inline .msiq-form__input {
  padding: 0.625rem 0.875rem;
}

.msiq-form--inline .msiq-form__btn {
  flex-shrink: 0;
}

@media (max-width: 480px) {
  .msiq-form--inline {
    flex-direction: column;
  }
}