/* 
  quiz.css — Responsive styles for the picture quiz interface
  Provides layout, button styling, confetti animations, and mobile-first responsive design
  
  Dependencies: Requires CSS variables from style.css (--color-primary, --color-secondary, --color-accent, etc.)
  Responsive breakpoints: 1024px (tablet), 768px (small tablet), 640px (mobile), 480px (small mobile)
*/

:root {
  /* Subtle gradient background for visual interest */
  --quiz-bg-1: linear-gradient(120deg, color-mix(in srgb, var(--color-primary) 8%, transparent), color-mix(in srgb, var(--color-secondary) 6%, transparent));
}

body {
  font-family: var(--font-family-body);
  background: var(--color-surface);
  color: var(--color-on-surface);
  margin: 0;
}

/* Header bar with gradient background and elevated shadow */
.quiz-header {
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  color: var(--color-on-primary);
  padding: 0.75rem 1rem;
  box-shadow: var(--shadow-level-1);
  position: relative;
  z-index: 100; /* Ensures header stays above interactive content like buttons */
}

/* Container for logo and navigation, centered with max-width constraint */
.quiz-header-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* App logo styling in header */
.quiz-logo {
  font-family: var(--font-family-heading);
  font-weight: var(--font-weight-bold);
  color: var(--color-on-primary);
  text-decoration: none;
  font-size: 1.25rem;
}

/* Navigation link styling in header */
.quiz-nav-link {
  color: var(--color-on-primary);
  margin-left: 1rem;
  text-decoration: none;
  font-weight: var(--font-weight-medium);
}

.quiz-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  flex: 1;
  min-height: auto;
}

/* Main quiz card with two-column layout (image left, controls right on desktop) */
.quiz-card {
  width: 100%;
  max-width: 1100px;
  display: grid;
  grid-template-columns: 1fr minmax(300px, 420px); /* Image column, then controls column */
  gap: 2rem;
  align-items: center;
  padding: 1.5rem;
  margin: 0 auto;
  box-sizing: border-box;
}

/* Container for the quiz image */
.quiz-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Image display area with rounded corners and shadow */
.quiz-image {
  width: 100%;
  max-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-radius: var(--border-radius-xl);
  background: var(--color-surface-elevated);
  box-shadow: var(--shadow-level-2);
  padding: 1rem;
}

.quiz-image img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--border-radius-md);
}

/* Confetti animation container (positioned absolutely inside .quiz-image) */
.quiz-image { position: relative; }

.confetti-container {
  position: absolute;
  inset: 0;
  pointer-events: none; /* Allows clicks to pass through confetti */
  overflow: hidden;
  border-radius: inherit;
}

.confetti-piece {
  position: absolute;
  opacity: 0.95;
  width: 10px;
  height: 14px;
  border-radius: 2px;
  transform-origin: center;
  will-change: transform, opacity; /* Optimization for animation performance */
}

/* Confetti falling animation (smooth descent with rotation) */
@keyframes confetti-fall {
  0% { transform: translateY(-10vh) rotate(0deg) scale(1); opacity: 1; }
  70% { opacity: 1; }
  100% { transform: translateY(120%) rotate(360deg) scale(0.9); opacity: 0; }
}

/* Confetti burst animation (scaled entry, faster rotation) */
@keyframes confetti-burst {
  0% { transform: translateY(-10vh) rotate(0deg) scale(0); opacity: 1; }
  10% { transform: translateY(-10vh) rotate(0deg) scale(1); }
  70% { opacity: 1; }
  100% { transform: translateY(130%) rotate(720deg) scale(0.7); opacity: 0; }
}

.quiz-body {
  padding: 1rem 0.5rem;
}

/* Question text styling */
.quiz-question {
  font-family: var(--font-family-heading);
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

/* Grid layout for answer choice buttons (2 columns on desktop) */
.quiz-choices {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

/* Individual answer choice button styling */
.choice-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1rem;
  font-size: 1.05rem;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  min-height: 56px;
  box-shadow: var(--shadow-level-1);
  color: var(--color-on-surface);
  font-weight: var(--font-weight-medium);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

/* Assign distinct colors to each answer button for visual appeal */
#choice1 { background: var(--color-primary); }
#choice2 { background: var(--color-secondary); }
#choice3 { background: var(--color-accent); }
#choice4 { background: linear-gradient(90deg, var(--color-primary), var(--color-secondary)); }

/* Button hover and focus states */
.choice-btn:hover:not(:disabled) { 
  transform: translateY(-3px); 
  box-shadow: var(--shadow-level-3);
}

.choice-btn:focus-visible { 
  outline: 3px solid color-mix(in oklab, var(--color-primary) 60%, white);
}

.choice-btn[aria-pressed="true"] { 
  box-shadow: 0 8px 20px rgba(0,0,0,0.18);
  transform: translateY(-2px) scale(1.01);
}

.quiz-controls {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.5rem;
}

/* Feedback message area (displays correct/incorrect messages) */
.quiz-feedback {
  margin-top: 0.75rem;
  min-height: 1.25rem;
  color: color-mix(in srgb, var(--color-on-surface) 88%, black 12%);
}

/* Outline button style for "Back to Home" and other secondary actions */
.btn-outline {
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  background: transparent;
  text-decoration: none;
  padding: 0.6rem 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: all 160ms ease;
}

/* Button hover state with subtle background and dark text */
.btn-outline:hover { 
  background: color-mix(in srgb, var(--color-primary) 12%, transparent) !important;
  color: var(--color-primary) !important;
  border-color: var(--color-primary) !important;
}

/* Level button hover state (for 1/2/3 level indicators) */
.level-btn:hover {
  color: var(--color-primary) !important;
  background: color-mix(in srgb, var(--color-primary) 12%, transparent) !important;
}

/* Container for stage/level completion action buttons */
.stage-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
  flex-wrap: wrap;
}

.stage-actions .btn {
  flex: 1;
  min-width: 120px;
  padding: 0.65rem 1rem;
  font-size: 0.95rem;
  border-radius: 12px;
  cursor: pointer;
  border: none;
  font-weight: 600;
  transition: all 160ms ease;
}

/* Media query: Tablet layout (1024px and below) */
@media (max-width: 1024px) {
  .quiz-main { padding: 1.5rem 1rem; }
  .quiz-card { grid-template-columns: 1fr; gap: 1.5rem; padding: 1.25rem; } /* Image above text */
  .quiz-choices { grid-template-columns: 1fr; } /* Single-column button layout */
  .quiz-image { max-height: 400px; }
  .quiz-question { font-size: 1.4rem; }
}

/* Media query: Small tablet layout (768px and below) */
@media (max-width: 768px) {
  .quiz-main { padding: 1.25rem 0.75rem; }
  .quiz-card { gap: 1rem; padding: 1rem; }
  .quiz-image { max-height: 350px; padding: 0.75rem; }
  .quiz-body { padding: 0.5rem 0; }
  .quiz-question { font-size: 1.25rem; margin-bottom: 0.75rem; }
  .stage-action-question { font-size: 0.95rem; margin-bottom: 0.75rem; }
  .choice-btn { padding: 0.75rem 0.75rem; font-size: 0.95rem; min-height: 46px; }
  .quiz-choices { gap: 0.5rem; margin-bottom: 0.75rem; }
  .quiz-controls { gap: 0.5rem; flex-wrap: wrap; }
  .btn-outline { padding: 0.5rem 0.75rem; font-size: 0.9rem; }
  .quiz-feedback { font-size: 0.9rem; }
  .level-btn { padding: 0.5rem 0.75rem; font-size: 0.85rem; }
}

/* Media query: Mobile layout (640px and below) */
@media (max-width: 640px) {
  .quiz-main { padding: 1rem 0.5rem; }
  .quiz-card { width: 100%; gap: 0.75rem; padding: 0.75rem; box-sizing: border-box; }
  .quiz-image { max-height: 280px; padding: 0.5rem; }
  .quiz-body { padding: 0.25rem 0; }
  .quiz-question { font-size: 1.1rem; margin-bottom: 0.5rem; }
  .stage-action-question { font-size: 0.9rem; margin: 0.25rem 0 0.5rem 0; }
  .choice-btn { padding: 0.65rem 0.5rem; font-size: 0.85rem; min-height: 42px; border-radius: 8px; }
  .quiz-choices { grid-template-columns: 1fr; gap: 0.4rem; margin-bottom: 0.5rem; }
  .quiz-controls { gap: 0.4rem; flex-direction: column; } /* Stack buttons vertically */
  .quiz-controls .btn-outline { width: 100%; }
  .quiz-header-inner { padding: 0 0.5rem; }
  .quiz-logo { font-size: 0.95rem; }
  .quiz-nav-link { margin-left: 0.3rem; font-size: 0.8rem; }
  .quiz-feedback { font-size: 0.85rem; margin-top: 0.5rem; }
  .btn-outline { padding: 0.45rem 0.5rem; font-size: 0.8rem; }
  .level-btn { padding: 0.4rem 0.5rem; font-size: 0.75rem; }
  .stage-actions { display: flex; flex-direction: column; gap: 0.5rem; }
  .stage-actions .btn { width: 100%; }
}

/* Media query: Small mobile layout (480px and below) */
@media (max-width: 480px) {
  .quiz-main { padding: 0.75rem 0.5rem; }
  .quiz-card { gap: 0.5rem; padding: 0.5rem; }
  .quiz-image { max-height: 240px; padding: 0.4rem; }
  .quiz-question { font-size: 1rem; margin-bottom: 0.35rem; }
  .choice-btn { padding: 0.6rem 0.4rem; font-size: 0.8rem; min-height: 40px; }
  .quiz-choices { gap: 0.35rem; margin-bottom: 0.4rem; }
}

/* Footer styling with gradient background matching header */
.quiz-footer {
  background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
  color: var(--color-on-primary);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow-level-1);
  margin-top: auto;
}

/* Footer content container */
.quiz-footer-inner {
  max-width: var(--content-max-width);
  margin: 0 auto;
  font-size: 0.95rem;
  font-weight: var(--font-weight-medium);
}

/* Sticky footer: flex column layout ensures footer stays at bottom */
body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Decorative motif: subtle circle pattern in card corner */
.quiz-card::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  right: 10px;
  top: 10px;
  opacity: 0.06;
  background-image: radial-gradient(circle at 30% 30%, var(--color-primary) 0 10px, transparent 12px);
  border-radius: 50%;
}

/* Prevent horizontal scrollbar on small devices (fix for viewport overflow) */
html, body {
  max-width: 100%;
  overflow-x: hidden;
}

/* Ensure content wrappers never accidentally expand past viewport width */
.thq-section-padding, .thq-section-max-width, .about-hero {
  box-sizing: border-box;
}