/**
 * HIC OS Forms - Base Styles
 * Multi-brand form platform base stylesheet
 * Brand-specific overrides in brand-{id}.css
 */

/* CSS Variables (will be overridden by brand CSS) */
:root {
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 200ms ease-in-out;
  --transition-slow: 300ms ease-in-out;

  /* Z-index */
  --z-dropdown: 1000;
  --z-modal: 2000;
  --z-toast: 3000;
}

/* Reset & Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-heading);
  margin-bottom: var(--space-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
  margin-bottom: var(--space-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

/* Layout - Standalone Forms */
.form-container {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
}

.form-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.form-logo {
  max-width: 200px;
  height: auto;
  margin-bottom: var(--space-lg);
}

.form-title {
  font-size: 2rem;
  color: var(--color-heading);
  margin-bottom: var(--space-sm);
}

.form-description {
  font-size: 1.1rem;
  color: var(--color-text-muted);
  max-width: 600px;
  margin: 0 auto;
}

/* Layout - Embed Mode */
body.embed-mode {
  padding: var(--space-lg);
}

body.embed-mode .form-header {
  display: none;
}

body.embed-mode .form-container {
  max-width: 100%;
  padding: 0;
}

/* Form Structure */
.form-section {
  background: white;
  padding: var(--space-xl);
  margin-bottom: var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.form-section-title {
  font-size: 1.5rem;
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--color-border);
}

.form-section-description {
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
}

/* Field Groups */
.field-group {
  margin-bottom: var(--space-lg);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.field-row.two-col {
  grid-template-columns: repeat(2, 1fr);
}

.field-row.three-col {
  grid-template-columns: repeat(3, 1fr);
}

/* Form Fields */
.form-field {
  display: flex;
  flex-direction: column;
}

.form-label {
  font-weight: 500;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

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

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: white;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(19, 102, 254, 0.1);
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: var(--color-background-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.form-textarea {
  min-height: 100px;
  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 fill='%23333' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-sm) center;
  padding-right: var(--space-xl);
}

.form-help-text {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
}

.form-error {
  font-size: 0.875rem;
  color: var(--color-error);
  margin-top: var(--space-xs);
}

.form-field.has-error .form-input,
.form-field.has-error .form-select,
.form-field.has-error .form-textarea {
  border-color: var(--color-error);
}

/* Checkboxes & Radio Buttons */
.form-checkbox-group,
.form-radio-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-checkbox,
.form-radio {
  display: flex;
  align-items: center;
  cursor: pointer;
}

.form-checkbox input[type="checkbox"],
.form-radio input[type="radio"] {
  width: 20px;
  height: 20px;
  margin-right: var(--space-sm);
  cursor: pointer;
}

.form-checkbox label,
.form-radio label {
  margin-bottom: 0;
  cursor: pointer;
}

/* Consent Fields */
.consent-field {
  padding: var(--space-md);
  background-color: var(--color-background-muted);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

.consent-text {
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: var(--space-md) var(--space-xl);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-primary:disabled {
  background-color: var(--color-border);
  cursor: not-allowed;
  transform: none;
}

.btn-secondary {
  background-color: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

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

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

/* Loading State */
.btn-loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.btn-loading::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid white;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
  to { transform: rotate(360deg); }
}

/* Alerts & Messages */
.alert {
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-lg);
}

.alert-success {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid #10B981;
}

.alert-error {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #EF4444;
}

.alert-info {
  background-color: #DBEAFE;
  color: #1E40AF;
  border: 1px solid #3B82F6;
}

/* Loading Skeleton */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Hidden Fields and Sections (Conditional Logic) */
.field-hidden,
.section-hidden {
  display: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .field-row.two-col,
  .field-row.three-col {
    grid-template-columns: 1fr;
  }

  .form-container {
    padding: var(--space-md);
  }

  .form-section {
    padding: var(--space-md);
  }

  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  .form-title { font-size: 1.75rem; }
}

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .btn {
    padding: var(--space-sm) var(--space-lg);
  }
}