/* ============================================================
   Matchic — Components v2
   Liquid Glass Design System (from Flutter)
   ============================================================ */

/* ============================================================
   GLASS SURFACES (Multi-layer transparency)
   ============================================================ */

/* Base glass — frosted with subtle border */
.glass {
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius);
}

/* Glass with specular highlight (light diffusion) */
.glass-shine {
  position: relative;
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius);
  overflow: hidden;
}

.glass-shine::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(
    180deg,
    var(--color-specular-light) 0%,
    transparent 100%
  );
  pointer-events: none;
  border-radius: inherit;
}

/* Elevated glass — higher on the z-axis */
.glass-elevated {
  background: var(--surface-high);
  backdrop-filter: blur(var(--glass-blur-lg)) saturate(1.3);
  -webkit-backdrop-filter: blur(var(--glass-blur-lg)) saturate(1.3);
  border: var(--glass-border-visible) solid var(--border-visible);
  border-radius: var(--glass-radius);
  box-shadow: 0 4px 16px var(--shadow-elevated);
}

/* Solid surface (not transparent) */
.glass-solid {
  background: var(--surface-solid);
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius);
}

/* ============================================================
   GLASS CARD
   ============================================================ */

.glass-card {
  position: relative;
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.2);
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius);
  box-shadow: 0 1px 4px var(--shadow);
  transition: all var(--duration-normal) var(--ease-out-cubic);
  overflow: hidden;
}

/* Specular highlight on top edge */
.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-specular-light) 20%,
    var(--color-specular-light) 80%,
    transparent 100%
  );
  opacity: 0.6;
  pointer-events: none;
}

.glass-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px var(--shadow-elevated);
  border-color: var(--border-visible);
}

.glass-card:hover::before {
  opacity: 1;
}

/* Active/pressed state */
.glass-card:active {
  transform: translateY(-1px) scale(0.995);
  transition-duration: var(--duration-fast);
}

/* ============================================================
   BUTTONS (Flutter ElevatedButton / OutlinedButton / TextButton)
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: 16px; /* Flutter: BorderRadius.circular(16.r) */
  font-family: var(--font-family);
  font-weight: var(--font-semibold);
  font-size: var(--text-sm);
  letter-spacing: 0.5px;
  cursor: pointer;
  border: none;
  text-decoration: none !important;
  position: relative;
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out-cubic);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/* Primary Elevated Button */
.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
  box-shadow: 0 2px 8px rgba(33, 150, 243, 0.3);
}

.btn-primary:hover {
  background: var(--primary-variant);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(33, 150, 243, 0.4);
}

.btn-primary:active {
  transform: translateY(0) scale(0.98);
  box-shadow: 0 1px 4px rgba(33, 150, 243, 0.2);
  transition-duration: var(--duration-fast);
}

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

/* Secondary Elevated Button */
.btn-secondary {
  background: var(--secondary);
  color: var(--on-secondary);
  box-shadow: 0 2px 8px rgba(3, 218, 198, 0.25);
}

.btn-secondary:hover {
  background: var(--secondary-variant);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(3, 218, 198, 0.35);
}

.btn-secondary:active {
  transform: translateY(0) scale(0.98);
  transition-duration: var(--duration-fast);
}

/* Outlined Button (Glass outline) */
.btn-outlined {
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-sm));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm));
  color: var(--primary);
  border: 1.5px solid var(--primary);
}

.btn-outlined:hover {
  background: var(--primary-alpha);
  transform: translateY(-2px);
  border-color: var(--primary-variant);
}

.btn-outlined:active {
  transform: translateY(0) scale(0.98);
  background: var(--primary-alpha-strong);
  transition-duration: var(--duration-fast);
}

/* Text Button (Minimal) */
.btn-text {
  background: transparent;
  color: var(--primary);
  padding: var(--space-2) var(--space-4);
}

.btn-text:hover {
  background: var(--primary-alpha);
}

.btn-text:active {
  background: var(--primary-alpha-strong);
  transition-duration: var(--duration-fast);
}

/* Large Button */
.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  border-radius: 16px;
}

/* Glow effect */
.btn-glow {
  box-shadow: 0 2px 20px rgba(33, 150, 243, 0.3);
}

.btn-glow:hover {
  box-shadow: 0 4px 30px rgba(33, 150, 243, 0.5);
}

/* Disabled state */
.btn:disabled,
.btn-disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   CHIPS / TAGS (Flutter ChipTheme)
   ============================================================ */

.chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-sm));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm));
  border: var(--glass-border) solid var(--border);
  border-radius: 12px; /* Flutter: BorderRadius.circular(12.r) */
  font-family: var(--font-family);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out-cubic);
  user-select: none;
}

.chip:hover {
  background: var(--surface-high);
  border-color: var(--border-visible);
}

.chip:active {
  transform: scale(0.96);
  transition-duration: var(--duration-fast);
}

.chip-selected {
  background: var(--primary-alpha-strong);
  border-color: var(--primary);
  color: var(--primary);
}

.chip-selected:hover {
  background: var(--primary-alpha);
}

.chip-disabled {
  opacity: 0.38;
  cursor: not-allowed;
  pointer-events: none;
}

/* ============================================================
   BADGE / PILL
   ============================================================ */

.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-sm));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm));
  border: var(--glass-border) solid var(--border);
  border-radius: 100px;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
}

.badge-primary {
  background: linear-gradient(
    135deg,
    var(--primary-alpha) 0%,
    var(--secondary-alpha) 100%
  );
  border-color: rgba(33, 150, 243, 0.25);
  color: var(--primary);
}

/* ============================================================
   TRUST PILLS
   ============================================================ */

.trust-pills {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.trust-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-3);
  background: var(--surface);
  backdrop-filter: blur(calc(var(--glass-blur) / 3));
  -webkit-backdrop-filter: blur(calc(var(--glass-blur) / 3));
  border: var(--glass-border) solid var(--border);
  border-radius: 100px;
  font-size: var(--text-xs);
  color: var(--text-secondary);
  transition: all var(--duration-fast) var(--ease-out-cubic);
}

.trust-pill:hover {
  border-color: var(--border-visible);
  background: var(--surface-high);
}

.trust-pill svg {
  width: 12px;
  height: 12px;
  color: var(--primary);
}

/* ============================================================
   NAVIGATION (Flutter AppBar)
   ============================================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: var(--z-nav);
  backdrop-filter: blur(var(--glass-blur)) saturate(1.5);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(1.5);
  background: var(--surface);
  border-bottom: var(--glass-border) solid var(--border);
  transition: background var(--duration-normal) var(--ease-out-cubic);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--text);
  font-weight: var(--font-semibold);
  font-size: var(--text-lg);
  letter-spacing: -0.01em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav-links a {
  display: block;
  padding: var(--space-2) var(--space-3);
  color: var(--text-secondary);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  border-radius: var(--glass-radius-sm);
  transition: all var(--duration-fast) var(--ease-out-cubic);
  white-space: nowrap;
  letter-spacing: 0.5px;
}

.nav-links a:hover,
.nav-links a:focus {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

/* Selected nav item (Flutter: selectedBackground + selectedForeground) */
.nav-links a.active {
  color: var(--primary);
  background: var(--primary-alpha);
}

.nav-cta {
  padding: var(--space-2) var(--space-5) !important;
  background: var(--primary) !important;
  color: var(--on-primary) !important;
  border-radius: 16px !important;
  font-weight: var(--font-semibold) !important;
  letter-spacing: 0.5px !important;
}

.nav-cta:hover {
  background: var(--primary-variant) !important;
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(33, 150, 243, 0.3);
}

/* ============================================================
   INPUT FIELDS (Flutter InputDecoration)
   ============================================================ */

.input-field {
  width: 100%;
  padding: var(--space-4) var(--space-5);
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-sm));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm));
  border: var(--glass-border) solid var(--border);
  border-radius: 16px;
  font-family: var(--font-family);
  font-size: var(--text-base);
  color: var(--text);
  transition: all var(--duration-normal) var(--ease-out-cubic);
  outline: none;
}

.input-field::placeholder {
  color: var(--text-hint);
}

.input-field:hover {
  border-color: var(--border-visible);
}

.input-field:focus {
  border-color: var(--primary);
  border-width: 2px;
  box-shadow: 0 0 0 3px var(--primary-alpha);
}

.input-field:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

/* Error state */
.input-field.error {
  border-color: var(--color-error);
  border-width: 1.5px;
}

.input-field.error:focus {
  box-shadow: 0 0 0 3px var(--color-error-bg);
}

/* ============================================================
   STATUS / FEEDBACK (Flutter StatusColors)
   ============================================================ */

.status-success {
  color: var(--color-success);
  background: var(--color-success-bg);
}

.status-warning {
  color: var(--color-warning);
  background: var(--color-warning-bg);
}

.status-error {
  color: var(--color-error);
  background: var(--color-error-bg);
}

.status-info {
  color: var(--color-info);
  background: var(--color-info-bg);
}

/* ============================================================
   DIVIDER
   ============================================================ */

.divider {
  height: 1px;
  background: var(--outline);
  border: none;
  margin: var(--space-4) 0;
}

.divider-vertical {
  width: 1px;
  height: auto;
  background: var(--outline);
}

/* ============================================================
   MODAL / DIALOG (Flutter DialogTheme)
   ============================================================ */

.dialog-overlay {
  position: fixed;
  inset: 0;
  background: var(--scrim);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: var(--z-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-normal) var(--ease-out-cubic);
}

.dialog-overlay.active {
  opacity: 1;
  visibility: visible;
}

.dialog {
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-lg));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg));
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius);
  box-shadow: 0 20px 60px var(--shadow-elevated);
  max-width: 480px;
  width: 100%;
  max-height: 80vh;
  overflow: auto;
  transform: scale(0.95) translateY(20px);
  transition: transform var(--duration-normal) var(--ease-out-cubic);
}

.dialog-overlay.active .dialog {
  transform: scale(1) translateY(0);
}

.dialog-header {
  padding: var(--space-6) var(--space-6) var(--space-4);
}

.dialog-title {
  font-size: var(--text-headline-sm);
  font-weight: var(--font-bold);
  color: var(--text);
  margin: 0;
}

.dialog-content {
  padding: 0 var(--space-6) var(--space-4);
  color: var(--text-secondary);
  font-size: var(--text-body-md);
  line-height: var(--leading-relaxed);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-6) var(--space-6);
}

/* ============================================================
   BOTTOM SHEET (Flutter BottomSheetTheme)
   ============================================================ */

.bottom-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--surface);
  backdrop-filter: blur(var(--glass-blur-lg));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg));
  border: var(--glass-border) solid var(--border);
  border-bottom: none;
  border-radius: var(--glass-radius) var(--glass-radius) 0 0;
  box-shadow: 0 -10px 40px var(--shadow-elevated);
  z-index: var(--z-modal);
  transform: translateY(100%);
  transition: transform var(--duration-normal) var(--ease-out-cubic);
  max-height: 70vh;
  overflow-y: auto;
}

.bottom-sheet.active {
  transform: translateY(0);
}

.bottom-sheet-handle {
  width: 40px;
  height: 4px;
  background: var(--outline);
  border-radius: 2px;
  margin: var(--space-3) auto;
}

/* ============================================================
   TOOLTIP
   ============================================================ */

.tooltip {
  position: relative;
}

.tooltip-text {
  position: absolute;
  bottom: calc(100% + var(--space-2));
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  padding: var(--space-2) var(--space-4);
  background: var(--surface-solid);
  backdrop-filter: blur(var(--glass-blur-sm));
  -webkit-backdrop-filter: blur(var(--glass-blur-sm));
  border: var(--glass-border) solid var(--border);
  border-radius: var(--glass-radius-sm);
  font-size: var(--text-xs);
  color: var(--text);
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all var(--duration-fast) var(--ease-out-cubic);
  z-index: var(--z-tooltip);
  pointer-events: none;
}

.tooltip:hover .tooltip-text,
.tooltip:focus-visible .tooltip-text {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ============================================================
   SKELETON LOADING
   ============================================================ */

.skeleton {
  background: linear-gradient(
    90deg,
    var(--surface) 0%,
    var(--surface-high) 50%,
    var(--surface) 100%
  );
  background-size: 200% 100%;
  border-radius: var(--glass-radius-sm);
  animation: skeleton-pulse 1.5s ease-in-out infinite;
}

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

/* ============================================================
   PROGRESS INDICATOR
   ============================================================ */

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--surface);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 2px;
  transition: width var(--duration-slow) var(--ease-out-cubic);
}

.progress-circular {
  width: 48px;
  height: 48px;
  border: 3px solid var(--surface);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: progress-spin 1s linear infinite;
}

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

/* ============================================================
   SWITCH / TOGGLE
   ============================================================ */

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 48px;
  height: 28px;
  cursor: pointer;
}

.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}

.switch-track {
  position: absolute;
  inset: 0;
  background: var(--surface);
  border: var(--glass-border) solid var(--border);
  border-radius: 14px;
  transition: all var(--duration-normal) var(--ease-out-cubic);
}

.switch-thumb {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 24px;
  height: 24px;
  background: var(--text-secondary);
  border-radius: 50%;
  transition: all var(--duration-normal) var(--ease-out-cubic);
  box-shadow: 0 1px 4px var(--shadow);
}

.switch input:checked + .switch-track {
  background: var(--primary-alpha);
  border-color: var(--primary);
}

.switch input:checked + .switch-track + .switch-thumb,
.switch input:checked ~ .switch-thumb {
  transform: translateX(20px);
  background: var(--primary);
}

.switch input:focus-visible + .switch-track {
  box-shadow: 0 0 0 3px var(--primary-alpha);
}

/* ============================================================
   ACCESSIBILITY
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
  .btn,
  .chip,
  .glass-card,
  .input-field,
  .dialog,
  .bottom-sheet,
  .tooltip-text,
  .switch-track,
  .switch-thumb {
    transition: none !important;
    animation: none !important;
  }
  
  .glass-card:hover,
  .btn:hover {
    transform: none !important;
  }
  
  .skeleton {
    animation: none !important;
    background: var(--surface);
  }
  
  .progress-circular {
    animation: none !important;
  }
}

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}