/**
 * PhonoLogic Shared Components
 * ============================
 * 
 * Reusable UI components used across all pages.
 * Import AFTER variables.css
 * 
 * Components:
 * - Buttons (.btn, .btn-primary, .btn-secondary, .btn-ghost)
 * - Forms (.form-group, inputs, selects)
 * - Cards (.card, .card-header)
 * - Progress indicators (.progress-dot, .progress-line)
 * - Alerts (.alert, .alert-success, .alert-error)
 * 
 * @version 1.0.0
 */

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-7) var(--space-12);
  border: none;
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-base);
  -webkit-tap-highlight-color: transparent;
  position: relative;
  white-space: nowrap;
  min-width: fit-content;
}

.btn:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

/* Primary Button - Orange */
.btn-primary {
  background: var(--color-primary);
  color: var(--color-text-inverse);
  box-shadow: var(--shadow-primary);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-primary-hover);
}

@media (hover: hover) {
  .btn-primary:hover:not(:disabled) {
    transform: translateY(-1px);
  }
}

.btn-primary:disabled {
  background: var(--color-text-placeholder);
  box-shadow: none;
}

/* Secondary Button - Gray */
.btn-secondary {
  background: var(--color-bg-subtle);
  color: var(--color-text-secondary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

/* Ghost Button - Transparent */
.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-6);
  font-weight: var(--font-weight-medium);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--color-text-secondary);
  background: var(--color-bg-subtle);
}

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

.btn.loading::after {
  content: '';
  position: absolute;
  width: 18px;
  height: 18px;
  top: 50%;
  left: 50%;
  margin-left: -9px;
  margin-top: -9px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: var(--radius-full);
  animation: btn-spin 0.8s linear infinite;
}

.btn-primary.loading::after {
  border-top-color: var(--color-text-inverse);
}

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

/* Button Row Layout */
.btn-row {
  display: flex;
  gap: var(--space-5);
  margin-top: var(--space-12);
}

.btn-row.stacked {
  flex-direction: column;
  gap: var(--space-4);
}

.btn-row .btn {
  flex: 1;
}

/* ==========================================================================
   Form Elements
   ========================================================================== */

.form-group {
  margin-bottom: var(--space-8);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-3);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--space-6) var(--space-7);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-family: var(--font-family);
  font-size: var(--font-size-md); /* 16px prevents iOS zoom */
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg-card);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  -webkit-appearance: none;
  appearance: none;
}

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

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--color-border-focus);
  outline: none;
  box-shadow: 0 0 0 3px rgba(255, 138, 61, 0.1);
}

/* Select dropdown arrow */
.form-group select {
  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='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-7) center;
  padding-right: var(--space-20);
}

.form-hint {
  font-size: var(--font-size-sm);
  color: var(--color-text-placeholder);
  margin-top: var(--space-3);
}

/* Inline inputs (side by side) */
.inline-inputs {
  display: flex;
  gap: var(--space-6);
}

.inline-inputs .form-group:first-child {
  flex: 1;
}

.inline-inputs .form-group:last-child {
  width: 90px;
  flex-shrink: 0;
}

/* ==========================================================================
   Cards
   ========================================================================== */

.card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
}

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

.card-header {
  padding: var(--space-12) var(--space-14);
  text-align: center;
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.card-header-primary {
  background: var(--color-primary);
}

.card-header h1,
.card-header h2 {
  margin: 0;
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
}

.card-header p {
  margin: var(--space-3) 0 0 0;
  opacity: 0.9;
  font-size: var(--font-size-base);
}

.card-body {
  padding: var(--space-14);
}

/* ==========================================================================
   Progress Indicators
   ========================================================================== */

.step-indicators {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  margin-bottom: var(--space-12);
}

.progress-dot {
  width: 10px;
  height: 10px;
  border-radius: var(--radius-full);
  background: var(--color-border);
  transition: all var(--transition-slow);
  flex-shrink: 0;
}

.progress-dot.active {
  background: var(--color-primary);
  transform: scale(1.3);
}

.progress-dot.completed {
  background: var(--color-success);
}

.progress-line {
  width: 24px;
  height: 2px;
  background: var(--color-border);
  transition: background var(--transition-slow);
  flex-shrink: 0;
}

.progress-line.completed {
  background: var(--color-success);
}

/* ==========================================================================
   Alerts / Notes
   ========================================================================== */

.alert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-5);
  padding: var(--space-6) var(--space-7);
  border-radius: var(--radius-lg);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-8);
}

.alert-icon {
  font-size: var(--font-size-md);
  flex-shrink: 0;
}

.alert-success {
  background: #f0fdf4;
  border: 1px solid var(--color-success-border);
  color: var(--color-success-text);
}

.alert-warning {
  background: var(--color-warning-light);
  border: 1px solid var(--color-warning);
  color: var(--color-warning-dark);
}

.alert-error {
  background: var(--color-error-light);
  border: 1px solid var(--color-error);
  color: var(--color-error-dark);
}

.alert-info {
  background: var(--color-bg-cream);
  border: 1px solid var(--color-border-cream);
  color: var(--color-brand);
}

/* ==========================================================================
   Typography Utilities
   ========================================================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.text-muted { color: var(--color-text-muted); }
.text-primary { color: var(--color-primary); }
.text-success { color: var(--color-success); }
.text-error { color: var(--color-error); }

.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

/* ==========================================================================
   Skip Links (Accessibility)
   ========================================================================== */

.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-brand);
  color: var(--color-text-inverse);
  padding: var(--space-6) var(--space-12);
  z-index: var(--z-loading);
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  border-radius: 0 0 var(--radius-md) 0;
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 0;
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ==========================================================================
   Focus States (Accessibility)
   ========================================================================== */

.btn:focus-visible,
.card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.form-group input:focus-visible,
.form-group select:focus-visible,
.form-group textarea:focus-visible {
  outline: none; /* Using border-color change instead */
}

/* ==========================================================================
   Reduced Motion (Accessibility)
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  .btn,
  .progress-dot,
  .progress-line,
  .form-group input,
  .form-group select {
    animation: none !important;
    transition: none !important;
  }
}

/* ==========================================================================
   Responsive Utilities
   ========================================================================== */

@media (max-width: 480px) {
  .btn-row {
    flex-direction: column;
  }
  
  .inline-inputs {
    flex-direction: column;
    gap: 0;
  }
  
  .inline-inputs .form-group:last-child {
    width: 100%;
  }
}

/* ==========================================================================
   Info Box (Warning/Explanation callouts)
   ========================================================================== */

.info-box {
  background: var(--color-warning-bg, #fef3c7);
  border-radius: var(--radius-xl, 12px);
  padding: var(--space-8, 16px);
  margin-bottom: var(--space-10, 24px);
  border-left: 4px solid var(--color-warning, #f59e0b);
}

.info-box p {
  margin: 0;
  font-size: var(--font-size-sm, 14px);
  color: var(--color-warning-text, #92400e);
  line-height: 1.5;
}

.info-box--compact {
  padding: var(--space-6, 12px) var(--space-8, 16px);
  margin-bottom: var(--space-8, 16px);
}

.info-box--compact p {
  font-size: 13px;
  line-height: 1.4;
}

/* ==========================================================================
   Toast Notifications
   ========================================================================== */

@keyframes toastFadeIn {
  from { transform: translateX(-50%) translateY(20px); opacity: 0; }
  to { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes toastFadeOut {
  from { transform: translateX(-50%) translateY(0); opacity: 1; }
  to { transform: translateX(-50%) translateY(20px); opacity: 0; }
}