/* pua - Base styles */

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, sans-serif;
  min-height: 100dvh;
}

/* T019: Responsive layout - viewport units, max-width, padding for mobile/desktop */
main {
  min-height: 100dvh;
  min-height: 100vh; /* fallback for older browsers */
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 4vw, 2rem);
  transition: background 0.4s ease;
}

/* Deterministic background variants per content item id */
.bg-variant-0 { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); }
.bg-variant-1 { background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%); }
.bg-variant-2 { background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%); }
.bg-variant-3 { background: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%); }
.bg-variant-4 { background: linear-gradient(135deg, #fa709a 0%, #fee140 100%); }
.bg-variant-5 { background: linear-gradient(135deg, #a8edea 0%, #fed6e3 100%); }

/* T022: Mobile - mild gradients, thumbs above fold, theme matches background */
@media (max-width: 768px) {
  .bg-variant-0 { background: linear-gradient(180deg, #5a67d8 0%, #6b7de8 50%, #4c5fd8 100%); }
  .bg-variant-1 { background: linear-gradient(180deg, #ed64a6 0%, #f078b0 50%, #dd5a9c 100%); }
  .bg-variant-2 { background: linear-gradient(180deg, #4299e1 0%, #5aa8e8 50%, #3690d8 100%); }
  .bg-variant-3 { background: linear-gradient(180deg, #48bb78 0%, #5ac88a 50%, #3aa868 100%); }
  .bg-variant-4 { background: linear-gradient(180deg, #ed8936 0%, #f09a50 50%, #dd7a26 100%); }
  .bg-variant-5 { background: linear-gradient(180deg, #b2f5ea 0%, #c4f8ef 50%, #a0e8dc 100%); }
  /* Info icon: upper right, below status bar (avoids notch; clickable in PWA standalone) */
  .info-btn {
    top: max(clamp(0.5rem, 2vw, 1rem), env(safe-area-inset-top));
    left: auto;
    right: max(clamp(0.5rem, 2vw, 1rem), env(safe-area-inset-right));
  }
  /* Thumbs fixed at bottom so always above fold (visible in viewport) */
  .vote-buttons {
    position: fixed;
    bottom: max(1rem, env(safe-area-inset-bottom));
    left: 50%;
    transform: translateX(-50%);
    padding: 0;
    margin: 0;
    z-index: 15;
  }
  main {
    padding-bottom: 6rem; /* space for fixed thumbs */
    padding-top: env(safe-area-inset-top); /* match content to safe area under notch */
  }
}

/* Quote-style content block */
.content-block {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: clamp(0.75rem, 2vw, 1.5rem);
  max-width: min(42rem, 92vw);
}

/* T020: Text contrast and legibility - responsive font, weight, contrast per variant */
.content-text {
  font-size: clamp(1.375rem, 3vw + 1.2rem, 2rem);
  font-weight: 600;
  line-height: 1.6;
  margin: 0;
  text-align: center;
  transition: opacity 0.3s ease;
}

/* Dark backgrounds (0,1,2): light text for contrast */
.bg-variant-0 .content-text,
.bg-variant-1 .content-text,
.bg-variant-2 .content-text {
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

/* Light backgrounds (3,4,5): dark text for contrast */
.bg-variant-3 .content-text,
.bg-variant-4 .content-text,
.bg-variant-5 .content-text {
  color: rgba(0, 0, 0, 0.9);
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.4);
}

/* T021: Buttons - min 44px touch target per mobile UX */
.vote-buttons {
  display: flex;
  gap: clamp(1rem, 3vw, 1.5rem);
  padding: clamp(1rem, 3vw, 1.5rem) 0;
}

.vote-buttons button {
  width: 56px;
  height: 56px;
  min-width: 56px;
  min-height: 56px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease;
}

.vote-buttons button:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.05);
}

.vote-buttons button:active {
  transform: scale(0.98);
}

/* Transition animation between items */
main.transition-out .content-text {
  opacity: 0;
}

main.transition-in .content-text {
  animation: fadeIn 0.3s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* T023–T026: Loading, error, empty, vote-error states */
.hidden {
  display: none !important;
}

.state-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(0.75rem, 2vw, 1.5rem);
  max-width: min(42rem, 92vw);
  text-align: center;
}

.loading-state .loading-text,
.error-state .error-message,
.empty-state .empty-message {
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin: 0 0 1rem;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
}

.loading-state .loading-text {
  margin-bottom: 0;
}

.error-state button,
.empty-state button {
  min-width: 44px;
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.3);
  color: inherit;
  cursor: pointer;
  transition: background 0.15s ease;
}

.error-state button:hover,
.empty-state button:hover {
  background: rgba(255, 255, 255, 0.5);
}

/* Vote feedback overlays - confetti (thumbs up) and booh (thumbs down) */
.vote-feedback-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 5;
}

#confetti-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.booh-feedback {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  animation: boohShake 0.6s ease-out;
}

.booh-emoji {
  font-size: 4rem;
  animation: boohBounce 0.4s ease-out 0.2s both;
}

.booh-text {
  font-size: 1.75rem;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.95);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  letter-spacing: 0.15em;
  text-transform: lowercase;
  animation: boohFadeIn 0.3s ease-out 0.3s both;
}

@keyframes boohShake {
  0%, 100% { transform: translateX(0); }
  15% { transform: translateX(-12px) rotate(-3deg); }
  30% { transform: translateX(10px) rotate(2deg); }
  45% { transform: translateX(-8px) rotate(-2deg); }
  60% { transform: translateX(6px) rotate(1deg); }
  75% { transform: translateX(-4px); }
}

@keyframes boohBounce {
  0% { transform: scale(0.3); opacity: 0; }
  50% { transform: scale(1.15); }
  70% { transform: scale(0.95); }
  100% { transform: scale(1); opacity: 1; }
}

@keyframes boohFadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.vote-error-overlay {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  z-index: 10;
}

.vote-error-overlay p {
  margin: 0 0 1rem;
  font-size: 1.125rem;
}

.vote-error-overlay button {
  min-width: 44px;
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  border: none;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.9);
  color: #333;
  cursor: pointer;
}

.vote-error-overlay button:hover {
  background: #fff;
}

/* Info icon: upper right corner (below status bar for PWA on iPhone) */
.info-btn {
  position: fixed;
  top: max(clamp(0.5rem, 2vw, 1rem), env(safe-area-inset-top));
  right: max(clamp(0.5rem, 2vw, 1rem), env(safe-area-inset-right));
  left: auto;
  z-index: 20;
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  backdrop-filter: blur(8px);
  font-size: 1.25rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s ease, transform 0.15s ease;
}

.info-btn:hover {
  background: rgba(255, 255, 255, 0.4);
  transform: scale(1.08);
}

.info-btn:active {
  transform: scale(0.95);
}

/* Info overlay */
.info-overlay {
  position: fixed;
  inset: 0;
  z-index: 25;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(1rem, 4vw, 2rem);
  background: rgba(0, 0, 0, 0.4);
}

.info-overlay.hidden {
  display: none !important;
}

.info-overlay-content {
  background: #fff;
  max-width: min(28rem, 95vw);
  max-height: 85vh;
  overflow-y: auto;
  padding: 1.75rem;
  border-radius: 0.5rem;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
}

.info-overlay-content h2 {
  margin: 0 0 1.25rem;
  font-size: 1.25rem;
  font-weight: 600;
  color: #111;
}

.info-glossary {
  margin: 0 0 1.25rem;
}

.info-glossary dt {
  font-weight: 600;
  font-size: 0.875rem;
  margin-top: 1rem;
  color: #333;
}

.info-glossary dt:first-child {
  margin-top: 0;
}

.info-glossary dd {
  margin: 0.25rem 0 0;
  line-height: 1.55;
  font-size: 0.9rem;
  color: #555;
}

.info-close-btn {
  display: block;
  width: 100%;
  min-height: 44px;
  padding: 0.5rem 1rem;
  font-size: 0.9375rem;
  font-weight: 500;
  border: 1px solid #e2e8f0;
  border-radius: 0.5rem;
  background: #fff;
  color: #333;
  cursor: pointer;
  transition: background 0.15s ease;
}

.info-close-btn:hover {
  background: #f8fafc;
}

/* Version badge: bottom right, small white text */
.version {
  position: fixed;
  bottom: max(0.35rem, env(safe-area-inset-bottom));
  right: max(0.5rem, env(safe-area-inset-right));
  font-size: 0.65rem;
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
  font-weight: 400;
  z-index: 5;
  pointer-events: none;
}