/* ==========================================================================
   VideoNoteGPT Shared Components (T3.1)
   Accessible, responsive UI building blocks matching design tokens.
   ========================================================================== */

/* ── Base Buttons & Controls ────────────────────────────────────────────── */
.vng-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: var(--min-touch-target);
  min-width: var(--min-touch-target);
  padding: var(--space-1) var(--space-3);
  font-family: inherit;
  font-size: var(--step-sm);
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.vng-btn-primary {
  background-color: var(--color-primary);
  color: var(--color-primary-contrast);
  border-color: var(--color-primary);
}
.vng-btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}
.vng-btn-primary:active {
  background-color: var(--color-primary-active);
  border-color: var(--color-primary-active);
}

.vng-btn-secondary {
  background-color: var(--color-bg-page);
  color: var(--color-text-main);
  border-color: var(--color-border-subtle);
}
.vng-btn-secondary:hover {
  background-color: var(--color-bg-surface);
  border-color: var(--color-border-strong);
}

.vng-btn-ghost {
  background-color: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
}
.vng-btn-ghost:hover {
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
}

.vng-icon-btn {
  width: var(--min-touch-target);
  height: var(--min-touch-target);
  min-width: var(--min-touch-target);
  min-height: var(--min-touch-target);
  box-sizing: border-box;
  flex-shrink: 0;
  padding: var(--space-1);
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  cursor: pointer;
}
.vng-icon-btn:hover {
  background-color: var(--color-bg-surface);
  color: var(--color-text-main);
}

/* ── 1. Dialog & Bottom Sheet ───────────────────────────────────────────── */
.vng-dialog-backdrop {
  position: fixed;
  inset: 0;
  background-color: rgba(32, 33, 36, 0.6);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}

.vng-dialog-backdrop.is-open {
  opacity: 1;
  visibility: visible;
}

.vng-dialog {
  background-color: var(--color-bg-elevated);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  position: relative;
  outline: none;
  max-height: calc(100vh - 2 * var(--space-4));
  overflow-y: auto;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Desktop modal view (>= 640px) */
@media (min-width: 640px) {
  .vng-dialog {
    width: 100%;
    max-width: 540px;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    transform: scale(0.95);
    opacity: 0;
  }
  .vng-dialog-backdrop.is-open .vng-dialog {
    transform: scale(1);
    opacity: 1;
  }
  .vng-sheet-handle {
    display: none;
  }
}

/* Mobile bottom sheet view (< 640px) */
@media (max-width: 639.98px) {
  .vng-dialog-backdrop {
    align-items: flex-end;
  }
  .vng-dialog {
    width: 100%;
    max-width: 100%;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    padding: var(--space-2) var(--space-3) var(--space-4) var(--space-3);
    max-height: 85vh;
    border-bottom: none;
    transform: translateY(100%);
    opacity: 1;
  }
  .vng-dialog-backdrop.is-open .vng-dialog {
    transform: translateY(0);
  }
  .vng-sheet-handle {
    width: 40px;
    height: 4px;
    background-color: var(--color-border-subtle);
    border-radius: var(--radius-full);
    margin: var(--space-1) auto var(--space-2) auto;
  }
}

.vng-dialog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.vng-dialog-title {
  font-size: var(--step-lg);
  font-weight: 700;
  color: var(--color-text-main);
  margin: 0;
}

.vng-dialog-body {
  font-size: var(--step-base);
  color: var(--color-text-main);
  line-height: 1.5;
  margin-bottom: var(--space-4);
}

.vng-dialog-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* ── 2. Toast ───────────────────────────────────────────────────────────── */
.vng-toast-region {
  position: fixed;
  bottom: var(--space-3);
  right: var(--space-3);
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
  max-width: min(420px, calc(100vw - 2 * var(--space-2)));
}

.vng-toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: var(--step-sm);
  min-height: var(--min-touch-target);
  background-color: var(--color-bg-elevated);
  border: 1px solid var(--color-border-subtle);
  color: var(--color-text-main);
  animation: vng-slide-in 200ms ease-out forwards;
}

.vng-toast--info {
  border-left: 4px solid var(--color-info);
}
.vng-toast--success {
  border-left: 4px solid var(--color-success);
}
.vng-toast--warning {
  border-left: 4px solid var(--color-warning);
}
.vng-toast--error {
  border-left: 4px solid var(--color-error);
}

.vng-toast-icon {
  font-size: var(--step-lg);
  flex-shrink: 0;
  display: inline-flex;
}

.vng-toast-message {
  flex: 1;
  word-break: break-word;
}

.vng-toast-close {
  min-width: var(--min-touch-target);
  min-height: var(--min-touch-target);
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}
.vng-toast-close:hover {
  color: var(--color-text-main);
  background-color: var(--color-bg-surface);
}

@keyframes vng-slide-in {
  from {
    transform: translateY(12px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* ── 3. State Panel ─────────────────────────────────────────────────────── */
.vng-state-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-6) var(--space-4);
  border-radius: var(--radius-lg);
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  min-height: 240px;
  width: 100%;
}

.vng-state-panel-icon {
  font-size: var(--step-3xl);
  margin-bottom: var(--space-2);
  line-height: 1;
}

.vng-state-panel-title {
  font-size: var(--step-lg);
  font-weight: 700;
  color: var(--color-text-main);
  margin: 0 0 var(--space-1) 0;
}

.vng-state-panel-desc {
  font-size: var(--step-sm);
  color: var(--color-text-muted);
  max-width: 440px;
  margin: 0 0 var(--space-3) 0;
  line-height: 1.5;
}

.vng-state-panel-actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
}

/* Spinner for loading state */
.vng-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-info-border);
  border-top-color: var(--color-primary);
  border-radius: var(--radius-full);
  animation: vng-spin 800ms linear infinite;
  margin-bottom: var(--space-2);
}

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

/* ── 4. Banner (Zero CLS space reservation) ─────────────────────────────── */
.vng-banner-slot {
  min-height: 52px; /* Reserves layout space to prevent content jump / CLS */
  width: 100%;
  display: block;
}

.vng-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--step-sm);
  line-height: 1.4;
  border: 1px solid transparent;
  min-height: var(--min-touch-target);
}

.vng-banner-content {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
}

.vng-banner-icon {
  font-size: var(--step-lg);
  flex-shrink: 0;
}

.vng-banner--info {
  background-color: var(--color-info-bg);
  border-color: var(--color-info-border);
  color: var(--color-info-text);
}

.vng-banner--warning {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning-border);
  color: var(--color-warning-text);
}

.vng-banner-close {
  min-width: var(--min-touch-target);
  min-height: var(--min-touch-target);
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: inherit;
  opacity: 0.8;
}
.vng-banner-close:hover {
  opacity: 1;
  background-color: rgba(0, 0, 0, 0.05);
}

.vng-input,
.vng-dialog input[type="text"] {
  min-height: var(--min-touch-target);
  box-sizing: border-box;
}

/* ── 5. Skeleton ────────────────────────────────────────────────────────── */
.vng-skeleton {
  background: #f0f2f5;
  background-size: 200% 100%;
  animation: vng-shimmer 1.6s infinite ease-in-out;
  border-radius: var(--radius-sm);
  display: block;
}

.vng-skeleton-text {
  height: 14px;
  width: 100%;
  margin-bottom: var(--space-1);
}

.vng-skeleton-title {
  height: 22px;
  width: 55%;
  margin-bottom: var(--space-2);
}

.vng-skeleton-rect {
  height: 140px;
  width: 100%;
  border-radius: var(--radius-md);
}

.vng-skeleton-circle {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
}

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

/* ── 6. Tab Bar ─────────────────────────────────────────────────────────── */
.vng-tab-bar {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

/* Desktop layout (>= 640px) */
@media (min-width: 640px) {
  .vng-tab-bar {
    border-bottom: 1px solid var(--color-border-subtle);
    padding: 0 var(--space-1);
  }
}

/* Mobile dock (< 640px) */
@media (max-width: 639.98px) {
  .vng-tab-bar.is-mobile-docked {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 900;
    background-color: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border-subtle);
    border-bottom: none;
    justify-content: space-around;
    padding: var(--space-1) var(--space-2) calc(var(--space-1) + env(safe-area-inset-bottom, 0px));
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.08);
  }
}

.vng-tab {
  min-height: var(--min-touch-target);
  min-width: var(--min-touch-target);
  padding: var(--space-1) var(--space-3);
  font-family: inherit;
  font-size: var(--step-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.vng-tab:hover {
  color: var(--color-text-main);
  background-color: var(--color-bg-surface);
}

.vng-tab[aria-selected="true"] {
  color: var(--color-primary);
  font-weight: 600;
  border-bottom-color: var(--color-primary);
}

.vng-tabpanel {
  display: block;
  padding: var(--space-3) 0;
}
.vng-tabpanel[hidden] {
  display: none !important;
}

/* ── 7. Upgrade Sheet ───────────────────────────────────────────────────── */
.vng-upgrade-dialog {
  max-width: 480px;
}

.vng-upgrade-badge {
  display: inline-block;
  padding: 2px 8px;
  background-color: var(--color-info-bg);
  color: var(--color-info-text);
  border-radius: var(--radius-full);
  font-size: var(--step-sm);
  font-weight: 600;
  margin-bottom: var(--space-1);
}

.vng-upgrade-hero {
  margin-bottom: var(--space-3);
}

.vng-upgrade-title {
  font-size: var(--step-lg);
  font-weight: 700;
  margin: 0 0 var(--space-1) 0;
}

.vng-upgrade-sub {
  font-size: var(--step-sm);
  color: var(--color-text-muted);
  margin: 0;
}

.vng-upgrade-benefits {
  list-style: none;
  padding: 0;
  margin: var(--space-3) 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.vng-upgrade-benefit-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--step-sm);
  color: var(--color-text-main);
}

.vng-upgrade-benefit-icon {
  color: var(--color-success);
  font-weight: bold;
  flex-shrink: 0;
}

.vng-upgrade-price-box {
  background-color: var(--color-bg-surface);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  margin: var(--space-3) 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-1);
}

.vng-upgrade-price-val {
  font-size: var(--step-xl);
  font-weight: 800;
  color: var(--color-text-main);
}

.vng-upgrade-renews {
  font-size: var(--step-sm);
  color: var(--color-text-muted);
}

.vng-upgrade-refund {
  font-size: var(--step-sm);
  color: var(--color-success-text);
  background-color: var(--color-success-bg);
  border: 1px solid var(--color-success-border);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.vng-upgrade-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  width: 100%;
}

.vng-upgrade-cta {
  width: 100%;
  font-size: var(--step-base);
  padding: var(--space-2) var(--space-4);
}

.vng-upgrade-dismiss {
  width: 100%;
  text-align: center;
}

/* ── 9. In-App Browser Adapter (T3.2 / D21) ─────────────────────────────────── */

html[data-inapp] #google-signin-btn-container,
html[data-inapp] .google-auth-btn-wrap,
html[data-inapp] .btn-google,
html[data-inapp] .auth-divider,
html[data-inapp] #auth-or-divider {
  display: none !important;
}

.vng-inapp-banner {
  background: var(--color-info-bg, #F4F4F4);
  border-bottom: 1px solid var(--color-info-border, #E5E5E5);
  color: var(--color-text-main, #202124);
  padding: var(--space-2, 12px) var(--space-3, 16px);
  display: flex;
  flex-direction: column;
  gap: var(--space-2, 8px);
  position: relative;
  z-index: 1000;
  box-sizing: border-box;
}

@media (min-width: 640px) {
  .vng-inapp-banner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.vng-inapp-banner-content {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2, 10px);
  flex: 1;
}

.vng-inapp-banner-icon {
  font-size: var(--step-lg);
  line-height: 1.2;
}

.vng-inapp-banner-text {
  flex: 1;
}

.vng-inapp-banner-title {
  font-weight: 700;
  font-size: var(--step-sm);
  color: var(--color-text-main, #202124);
  margin-bottom: 2px;
}

.vng-inapp-banner-desc {
  font-size: var(--step-xs);
  color: var(--color-text-muted, #5f6368);
  line-height: 1.4;
}

.vng-inapp-banner-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2, 8px);
}

.vng-inapp-banner-copy-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  min-width: 44px;
  box-sizing: border-box;
  padding: 8px 16px;
  background: var(--color-primary, #111111);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm, 6px);
  font-weight: 600;
  font-size: var(--step-xs);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s ease;
}

.vng-inapp-banner-copy-btn:hover {
  background: var(--color-primary-hover, #1A1A1A);
}

.vng-inapp-banner-copy-btn.copied {
  background: var(--color-success, #188038);
}

.vng-inapp-banner-close-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  min-height: 44px;
  box-sizing: border-box;
  background: transparent;
  border: none;
  color: var(--color-text-muted, #5f6368);
  font-size: var(--step-lg);
  cursor: pointer;
  border-radius: var(--radius-sm, 6px);
}

.vng-inapp-banner-close-btn:hover {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text-main, #202124);
}