/**
 * ═══════════════════════════════════════════════════════════════════════════════
 * ANHAD CORE UI SYSTEM
 * Unified glass nav · iOS back button · Page transitions · Offline banner
 * Import this ONCE per page — works with or without trendora-premium.css
 * ═══════════════════════════════════════════════════════════════════════════════
 */

/* ─── Design token fallbacks (resolved by trendora-premium.css if loaded) ─── */
:root {
  --ac-gold:          #D4943A;
  --ac-gold-glow:     rgba(212, 148, 58, 0.22);
  --ac-gold-border:   rgba(212, 148, 58, 0.18);
  --ac-safe-top:      env(safe-area-inset-top,    20px);
  --ac-safe-bottom:   env(safe-area-inset-bottom, 34px);
  --ac-safe-left:     env(safe-area-inset-left,    0px);
  --ac-safe-right:    env(safe-area-inset-right,   0px);
  --ac-nav-height:    56px;
  --ac-blur:          blur(24px) saturate(180%);
  --ac-spring:        cubic-bezier(0.34, 1.56, 0.64, 1);
  --ac-smooth:        cubic-bezier(0.4, 0, 0.2, 1);
  --ac-ios:           cubic-bezier(0.32, 0.72, 0, 1);
  --ac-radius:        14px;

  /* Dark defaults */
  --ac-nav-bg:        rgba(18, 18, 22, 0.80);
  --ac-nav-border:    rgba(255, 255, 255, 0.07);
  --ac-nav-text:      rgba(255, 255, 255, 0.92);
  --ac-nav-sub:       rgba(255, 255, 255, 0.50);
  --ac-btn-bg:        rgba(255, 255, 255, 0.08);
  --ac-btn-hover:     rgba(255, 255, 255, 0.13);
  --ac-btn-active:    rgba(255, 255, 255, 0.18);
  --ac-offline-bg:    rgba(255, 59, 48, 0.90);
  --ac-online-bg:     rgba(48, 209, 88, 0.90);
}

/* Light theme overrides */
[data-theme="light"] {
  --ac-nav-bg:     rgba(248, 248, 252, 0.82);
  --ac-nav-border: rgba(0, 0, 0, 0.07);
  --ac-nav-text:   rgba(0, 0, 0, 0.88);
  --ac-nav-sub:    rgba(60, 60, 67, 0.55);
  --ac-btn-bg:     rgba(0, 0, 0, 0.05);
  --ac-btn-hover:  rgba(0, 0, 0, 0.09);
  --ac-btn-active: rgba(0, 0, 0, 0.13);
}

/* ─────────────────────────────────────────────────────────────────────────────
   GLASS NAV BAR
────────────────────────────────────────────────────────────────────────────── */
.glass-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: calc(var(--ac-nav-height) + var(--ac-safe-top));
  padding-top: var(--ac-safe-top);
  background: var(--ac-nav-bg);
  backdrop-filter: var(--ac-blur);
  -webkit-backdrop-filter: var(--ac-blur);
  border-bottom: 0.5px solid var(--ac-nav-border);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding-left: calc(var(--ac-safe-left) + 4px);
  padding-right: calc(var(--ac-safe-right) + 4px);
  /* REMOVED: will-change and transform that caused scroll rendering glitches */
  transition: background 0.25s var(--ac-smooth),
              border-color 0.25s var(--ac-smooth);
}

/* Thin gold hairline on scroll compact state */
.glass-nav.compact {
  border-bottom-color: var(--ac-gold-border);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.10);
}

/* ─── Back Button ─────────────────────────────────────────────────────────── */
.glass-nav__back,
.glass-back-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  min-width: 44px;
  min-height: 44px;
  padding: 0 10px 0 6px;
  border: none;
  background: var(--ac-btn-bg);
  color: var(--ac-gold);
  font-size: 15px;
  font-weight: 600;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', system-ui, sans-serif;
  letter-spacing: -0.2px;
  border-radius: 22px;
  cursor: pointer;
  text-decoration: none;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s var(--ac-smooth),
              transform  0.15s var(--ac-spring),
              box-shadow 0.15s var(--ac-smooth);
  /* touch target */
  touch-action: manipulation;
  user-select: none;
}

.glass-nav__back:hover,
.glass-back-btn:hover {
  background: var(--ac-btn-hover);
}

.glass-nav__back:active,
.glass-back-btn:active {
  background: var(--ac-btn-active);
  transform: scale(0.94);
}

/* Chevron SVG inside back button */
.glass-nav__back .back-chevron,
.glass-back-btn .back-chevron {
  width: 9px;
  height: 16px;
  flex-shrink: 0;
  stroke: currentColor;
  fill: none;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.glass-nav__back .back-label,
.glass-back-btn .back-label {
  line-height: 1;
}

/* ─── Nav Title ───────────────────────────────────────────────────────────── */
.glass-nav__title {
  font-size: 17px;
  font-weight: 700;
  color: var(--ac-nav-text);
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', system-ui, sans-serif;
  letter-spacing: -0.3px;
  text-align: center;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin: 0;
  padding: 0 8px;
}

/* ─── Right Action Button ─────────────────────────────────────────────────── */
.glass-nav__action {
  display: flex;
  justify-content: flex-end;
  align-items: center;
}

.glass-nav__action-btn,
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: var(--ac-btn-bg);
  color: var(--ac-nav-text);
  border-radius: 50%;
  cursor: pointer;
  font-size: 18px;
  -webkit-tap-highlight-color: transparent;
  transition: background 0.15s var(--ac-smooth),
              transform  0.15s var(--ac-spring);
  touch-action: manipulation;
  user-select: none;
}

.glass-nav__action-btn:hover,
.icon-btn:hover {
  background: var(--ac-btn-hover);
}

.glass-nav__action-btn:active,
.icon-btn:active {
  background: var(--ac-btn-active);
  transform: scale(0.90);
}

/* ─── Nav spacer — pushes content below the fixed glass nav ──────────────── */
.glass-nav-spacer {
  height: calc(var(--ac-nav-height) + var(--ac-safe-top) + 8px);
  flex-shrink: 0;
}

/* ─────────────────────────────────────────────────────────────────────────────
   TAPPABLE SPRING FEEDBACK
────────────────────────────────────────────────────────────────────────────── */
.tappable {
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  cursor: pointer;
  user-select: none;
  transition: transform 0.15s var(--ac-spring),
              opacity  0.15s var(--ac-smooth);
}

.tappable:active {
  transform: scale(0.97);
  opacity: 0.88;
}

/* ─────────────────────────────────────────────────────────────────────────────
   PAGE TRANSITIONS
────────────────────────────────────────────────────────────────────────────── */
@keyframes ac-page-enter {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.985);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes ac-page-exit {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-10px) scale(0.985);
  }
}

.page-enter {
  animation: ac-page-enter 0.48s var(--ac-spring) both;
  will-change: opacity, transform;
}

.page-exiting {
  animation: ac-page-exit 0.18s var(--ac-smooth) both;
  pointer-events: none !important;
  will-change: opacity, transform;
}

/* Staggered children */
.page-enter > *:nth-child(1)  { animation: ac-page-enter 0.48s var(--ac-spring) 0.00s both; }
.page-enter > *:nth-child(2)  { animation: ac-page-enter 0.48s var(--ac-spring) 0.04s both; }
.page-enter > *:nth-child(3)  { animation: ac-page-enter 0.48s var(--ac-spring) 0.08s both; }
.page-enter > *:nth-child(4)  { animation: ac-page-enter 0.48s var(--ac-spring) 0.12s both; }
.page-enter > *:nth-child(5)  { animation: ac-page-enter 0.48s var(--ac-spring) 0.16s both; }

/* ─────────────────────────────────────────────────────────────────────────────
   OFFLINE BANNER
────────────────────────────────────────────────────────────────────────────── */
.ac-offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 9990;
  padding: 10px 16px calc(10px + var(--ac-safe-top));
  padding-top: calc(var(--ac-safe-top) + 10px);
  background: var(--ac-offline-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', system-ui, sans-serif;
  letter-spacing: -0.1px;
  text-align: center;
  transform: translateY(-110%);
  transition: transform 0.35s var(--ac-ios);
  will-change: transform;
  pointer-events: none;
}

.ac-offline-banner.visible {
  transform: translateY(0);
  pointer-events: auto;
}

.ac-offline-banner.online {
  background: var(--ac-online-bg);
}

.ac-offline-banner__icon {
  margin-right: 6px;
  font-style: normal;
}

/* ─────────────────────────────────────────────────────────────────────────────
   GLASS CARD — shared utility
────────────────────────────────────────────────────────────────────────────── */
.ac-glass-card {
  background: var(--ac-btn-bg);
  border: 0.5px solid var(--ac-nav-border);
  border-radius: var(--ac-radius);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
}

/* ─────────────────────────────────────────────────────────────────────────────
   GOLD DIVIDER — section separator
────────────────────────────────────────────────────────────────────────────── */
.ac-divider {
  height: 0.5px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--ac-gold-border) 20%,
    var(--ac-gold-border) 80%,
    transparent 100%);
  margin: 12px 0;
}

/* ─────────────────────────────────────────────────────────────────────────────
   REDUCED MOTION — respect user accessibility preference
────────────────────────────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  .page-enter,
  .page-enter > * {
    animation: none;
    opacity: 1;
    transform: none;
  }

  .page-exiting {
    animation: none;
  }

  .glass-nav,
  .glass-nav__back,
  .glass-back-btn,
  .glass-nav__action-btn,
  .icon-btn,
  .tappable,
  .ac-offline-banner {
    transition: none;
  }
}

/* ─────────────────────────────────────────────────────────────────────────────
   PWA UPDATE SECTION — Manual Update Check Button (Static, below cards)
────────────────────────────────────────────────────────────────────────────── */
.pwa-update-section {
  position: relative;
  margin: 24px auto 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 16px;
}

.pwa-update-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--ac-btn-bg);
  border: 0.5px solid var(--ac-nav-border);
  border-radius: 20px;
  color: var(--ac-nav-sub);
  font-size: 12px;
  font-weight: 500;
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'Inter', system-ui, sans-serif;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: all 0.2s var(--ac-smooth);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
}

.pwa-update-btn:hover {
  background: var(--ac-btn-hover);
}

.pwa-update-btn:active {
  background: var(--ac-btn-active);
  transform: scale(0.96);
}

.pwa-update-btn.checking {
  color: var(--ac-gold);
  border-color: var(--ac-gold-border);
}

.pwa-update-btn.checking .pwa-update-btn__icon {
  animation: spin 1s linear infinite;
}

.pwa-update-btn.available {
  background: rgba(48, 209, 88, 0.15);
  color: #30d158;
  border-color: rgba(48, 209, 88, 0.3);
}

.pwa-update-btn.uptodate {
  color: rgba(255, 255, 255, 0.4);
}

.pwa-update-btn.error {
  color: #ff453a;
  border-color: rgba(255, 69, 58, 0.3);
}

.pwa-update-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.pwa-update-btn__icon {
  font-size: 14px;
  display: inline-block;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.pwa-update-status {
  font-size: 11px;
  font-weight: 500;
  color: var(--ac-nav-sub);
  opacity: 0;
  transition: opacity 0.2s var(--ac-smooth);
}

.pwa-update-status.checking,
.pwa-update-status.available,
.pwa-update-status.uptodate,
.pwa-update-status.error {
  opacity: 1;
}

.pwa-update-status.available {
  color: #30d158;
}

.pwa-update-status.error {
  color: #ff453a;
}

.pwa-update-lastcheck {
  font-size: 10px;
  color: var(--ac-nav-sub);
  opacity: 0.6;
}

/* Light theme overrides */
[data-theme="light"] .pwa-update-btn.uptodate {
  color: rgba(0, 0, 0, 0.4);
}

/* Desktop: center in main content */
@media screen and (min-width: 1024px) {
  .pwa-update-section {
    margin-left: 120px;
  }
}

/* ─────────────────────────────────────────────────────────────────────────────
   PWA UPDATE PROMPT — Install dialog
────────────────────────────────────────────────────────────────────────────── */
.pwa-update-prompt {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  opacity: 0;
  transition: opacity 0.3s var(--ac-smooth);
  padding: 20px;
}

.pwa-update-prompt.visible {
  opacity: 1;
}

.pwa-update-prompt__content {
  background: var(--ac-nav-bg);
  border: 0.5px solid var(--ac-nav-border);
  border-radius: var(--ac-radius);
  padding: 24px;
  max-width: 320px;
  text-align: center;
  transform: scale(0.9);
  transition: transform 0.3s var(--ac-spring);
}

.pwa-update-prompt.visible .pwa-update-prompt__content {
  transform: scale(1);
}

.pwa-update-prompt__icon {
  font-size: 40px;
  margin-bottom: 12px;
}

.pwa-update-prompt__title {
  font-size: 18px;
  font-weight: 600;
  color: var(--ac-nav-text);
  margin-bottom: 8px;
}

.pwa-update-prompt__text {
  font-size: 14px;
  color: var(--ac-nav-sub);
  line-height: 1.5;
  margin-bottom: 20px;
}

.pwa-update-prompt__actions {
  display: flex;
  gap: 10px;
}

.pwa-update-prompt__btn {
  flex: 1;
  padding: 12px 16px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  -webkit-tap-highlight-color: transparent;
  transition: all 0.15s var(--ac-smooth);
}

.pwa-update-prompt__btn--primary {
  background: var(--ac-gold);
  color: #000;
}

.pwa-update-prompt__btn--primary:hover {
  background: #e5a547;
}

.pwa-update-prompt__btn--secondary {
  background: var(--ac-btn-bg);
  color: var(--ac-nav-text);
}

.pwa-update-prompt__btn--secondary:hover {
  background: var(--ac-btn-hover);
}

/* Hide update section when install banner is shown */
.install-banner:not([style*="display: none"]) ~ .app .pwa-update-section,
.install-banner:not(.hidden) ~ .app .pwa-update-section {
  margin-bottom: 80px;
}