/* Science Fair Educational Game - Master Stylesheet */
:root {
  --bg-dark: #0a0f1d;
  --bg-card: rgba(18, 26, 47, 0.85);
  --bg-card-hover: rgba(28, 40, 72, 0.9);
  --border-glow: rgba(0, 229, 255, 0.25);
  --border-glow-active: rgba(0, 229, 255, 0.7);
  --cyan-glow: #00e5ff;
  --emerald-glow: #00e676;
  --amber-gold: #ffd600;
  --coral-red: #ff3d71;
  --violet-glow: #a855f7;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --font-main: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, Courier, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-main);
  background: radial-gradient(circle at 50% 0%, #151c38 0%, #070a14 100%);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
}

/* Background Animated Grid */
.bg-grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
  pointer-events: none;
  z-index: 0;
}

/* Header & Top Bar */
.app-header {
  position: relative;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: rgba(10, 15, 29, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 14px;
  cursor: pointer;
}

.school-header-logo {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--amber-gold);
  box-shadow: 0 0 12px rgba(255, 214, 0, 0.4);
}

.atom-icon {
  font-size: 28px;
  animation: atomPulse 4s infinite linear;
}

@keyframes atomPulse {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(1.1); }
  100% { transform: rotate(360deg) scale(1); }
}

.brand-text h1 {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  background: linear-gradient(135deg, #ffffff 30%, var(--cyan-glow) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-text p {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.designer-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(255, 214, 0, 0.12);
  border: 1px solid var(--amber-gold);
  border-radius: 9999px;
  font-size: 0.8rem;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 0 12px rgba(255, 214, 0, 0.2);
}

.designer-badge strong {
  color: var(--amber-gold);
}

/* Offline PWA & Network Status Badge */
.network-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 6px 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9999px;
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 700;
}

.net-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  background: var(--emerald-glow);
  box-shadow: 0 0 8px var(--emerald-glow);
}

.net-dot.offline {
  background: var(--amber-gold);
  box-shadow: 0 0 8px var(--amber-gold);
}

.hero-creator-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  background: rgba(255, 214, 0, 0.15);
  border: 1px solid var(--amber-gold);
  border-radius: 9999px;
  font-size: 0.95rem;
  color: #fff;
  margin-top: 10px;
  box-shadow: 0 0 15px rgba(255, 214, 0, 0.25);
}

.hero-creator-pill strong {
  color: var(--amber-gold);
}

.badge-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9999px;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.badge-button:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cyan-glow);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.3);
}

.printer-status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #64748b;
  display: inline-block;
  box-shadow: 0 0 6px currentColor;
}

.printer-status-dot.connected {
  background: var(--emerald-glow);
  box-shadow: 0 0 8px var(--emerald-glow);
}

.printer-status-dot.connecting {
  background: var(--amber-gold);
  animation: blink 0.8s infinite;
}

@keyframes blink {
  50% { opacity: 0.3; }
}

/* App Main Container */
.app-container {
  position: relative;
  z-index: 1;
  flex: 1;
  display: flex;
  flex-direction: column;
  max-width: 1280px;
  width: 100%;
  margin: 0 auto;
  padding: 24px 20px;
}

/* Screens Visibility */
.screen {
  display: none;
  animation: fadeIn 0.35s ease-out forwards;
}

.screen.active {
  display: flex;
  flex-direction: column;
  flex: 1;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* HOME SCREEN */
.hero-banner {
  text-align: center;
  margin-bottom: 28px;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  border-radius: 20px;
  color: var(--cyan-glow);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.hero-title {
  font-size: 2.6rem;
  font-weight: 900;
  line-height: 1.2;
  margin-bottom: 10px;
  letter-spacing: -0.5px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--cyan-glow), var(--emerald-glow));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
}

/* User Profile Input Bar */
.user-input-card {
  max-width: 580px;
  margin: 0 auto 32px auto;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 16px 20px;
  display: flex;
  align-items: center;
  gap: 14px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.35);
}

.input-icon {
  font-size: 22px;
  color: var(--cyan-glow);
}

.input-group {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.input-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-secondary);
  font-weight: 700;
  margin-bottom: 2px;
}

.name-input {
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-size: 1.1rem;
  font-weight: 600;
  width: 100%;
}

.name-input::placeholder {
  color: var(--text-muted);
}

/* Mode Selection Cards */
.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  margin-bottom: 36px;
}

.mode-card {
  position: relative;
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 2px solid rgba(255, 255, 255, 0.08);
  border-radius: 20px;
  padding: 28px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.mode-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, rgba(0, 229, 255, 0.12), transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.mode-card:hover {
  transform: translateY(-6px);
  border-color: var(--cyan-glow);
  box-shadow: 0 14px 35px rgba(0, 229, 255, 0.2);
}

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

.mode-card.phenomenon:hover {
  border-color: var(--emerald-glow);
  box-shadow: 0 14px 35px rgba(0, 230, 118, 0.2);
}

.mode-icon-badge {
  width: 58px;
  height: 58px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  margin-bottom: 20px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid rgba(0, 229, 255, 0.3);
  color: var(--cyan-glow);
}

.mode-card.phenomenon .mode-icon-badge {
  background: rgba(0, 230, 118, 0.1);
  border-color: rgba(0, 230, 118, 0.3);
  color: var(--emerald-glow);
}

.mode-card-title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.mode-card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.5;
  margin-bottom: 20px;
  flex: 1;
}

.mode-features-list {
  list-style: none;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mode-features-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.mode-features-list li span {
  color: var(--cyan-glow);
}

.start-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-card:hover .start-btn {
  background: linear-gradient(135deg, #00b4d8, #0077b6);
  box-shadow: 0 4px 15px rgba(0, 180, 216, 0.4);
}

.mode-card.phenomenon .start-btn {
  background: linear-gradient(135deg, #059669, #047857);
}

.mode-card.phenomenon:hover .start-btn {
  background: linear-gradient(135deg, #10b981, #059669);
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

/* English Mode Card Variants */
.mode-card.english-syn:hover {
  border-color: var(--violet-glow);
  box-shadow: 0 14px 35px rgba(168, 85, 247, 0.25);
}

.mode-card.english-syn .mode-icon-badge {
  background: rgba(168, 85, 247, 0.12);
  border-color: rgba(168, 85, 247, 0.35);
  color: var(--violet-glow);
}

.mode-card.english-syn .start-btn {
  background: linear-gradient(135deg, #7c3aed, #6d28d9);
}

.mode-card.english-syn:hover .start-btn {
  background: linear-gradient(135deg, #9333ea, #7c3aed);
  box-shadow: 0 4px 15px rgba(147, 51, 234, 0.4);
}

.mode-card.english-idiom:hover {
  border-color: var(--amber-gold);
  box-shadow: 0 14px 35px rgba(255, 214, 0, 0.25);
}

.mode-card.english-idiom .mode-icon-badge {
  background: rgba(255, 214, 0, 0.12);
  border-color: rgba(255, 214, 0, 0.35);
  color: var(--amber-gold);
}

.mode-card.english-idiom .start-btn {
  background: linear-gradient(135deg, #d97706, #b45309);
}

.mode-card.english-idiom:hover .start-btn {
  background: linear-gradient(135deg, #f59e0b, #d97706);
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.4);
}

/* Subject Filter Pills */
.subject-filter-container {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.subject-pill-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 9999px;
  color: var(--text-secondary);
  font-size: 0.92rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.subject-pill-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
  border-color: var(--cyan-glow);
}

.subject-pill-btn.active {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.2), rgba(168, 85, 247, 0.2));
  border-color: var(--cyan-glow);
  color: #fff;
  box-shadow: 0 0 15px rgba(0, 229, 255, 0.3);
}

/* Home Quick Stats & Quick Leaderboard Preview */
.home-bottom-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.info-card {
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 20px;
}

.info-card h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.rules-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rules-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.rules-list li strong {
  color: var(--text-primary);
}

.mini-leaderboard-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mini-score-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
  font-size: 0.88rem;
}

.mini-score-rank {
  font-weight: 800;
  width: 24px;
  color: var(--amber-gold);
}

.mini-score-name {
  font-weight: 600;
  flex: 1;
}

.mini-score-pts {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--cyan-glow);
}

/* GAMEPLAY SCREEN */
.game-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  padding: 14px 24px;
  margin-bottom: 20px;
}

.game-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.game-mode-badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0, 229, 255, 0.15);
  border: 1px solid var(--cyan-glow);
  border-radius: 20px;
  color: var(--cyan-glow);
  font-size: 0.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.game-player-badge {
  font-weight: 700;
  font-size: 1rem;
}

/* Strict 60-Second Timer Gauge */
.timer-container {
  display: flex;
  align-items: center;
  gap: 16px;
}

.timer-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 0, 0, 0.4);
  padding: 8px 16px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: all 0.3s ease;
}

.timer-icon {
  font-size: 20px;
  color: var(--cyan-glow);
}

.timer-digits {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 1px;
  color: var(--cyan-glow);
}

.timer-box.warning {
  border-color: var(--amber-gold);
  box-shadow: 0 0 12px rgba(255, 214, 0, 0.3);
}

.timer-box.warning .timer-digits,
.timer-box.warning .timer-icon {
  color: var(--amber-gold);
}

.timer-box.critical {
  border-color: var(--coral-red);
  background: rgba(255, 61, 113, 0.15);
  box-shadow: 0 0 16px rgba(255, 61, 113, 0.5);
  animation: pulseCritical 0.6s infinite alternate;
}

.timer-box.critical .timer-digits,
.timer-box.critical .timer-icon {
  color: var(--coral-red);
}

@keyframes pulseCritical {
  from { transform: scale(1); }
  to { transform: scale(1.05); }
}

/* Score and Stars Bar */
.game-stats-group {
  display: flex;
  align-items: center;
  gap: 18px;
}

.stat-pill {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.stat-pill-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 700;
}

.stat-pill-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--emerald-glow);
}

.live-stars-display {
  display: flex;
  gap: 4px;
  font-size: 1.25rem;
  color: var(--amber-gold);
}

.live-star.inactive {
  color: rgba(255, 255, 255, 0.18);
}

/* Main Split Gameplay Layout (Left visual + term, Right choices) */
.gameplay-split {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 24px;
  flex: 1;
}

/* Left Card: Scientific Visual & Term */
.visual-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-glow);
  border-radius: 20px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.visual-top-info {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.category-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  background: rgba(168, 85, 247, 0.15);
  border: 1px solid var(--violet-glow);
  border-radius: 9999px;
  color: #d8b4fe;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
}

.question-counter {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.visual-display-area {
  position: relative;
  background: #020617;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.sci-illustration-svg {
  width: 100%;
  height: 100%;
  max-height: 250px;
  display: block;
}

#phenomenon-canvas {
  width: 100%;
  height: 100%;
  max-height: 250px;
  display: block;
  background: #000;
}

.term-container {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  padding: 14px 18px;
}

.term-eyebrow {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--cyan-glow);
  letter-spacing: 1px;
  font-weight: 800;
  margin-bottom: 2px;
}

.scientific-term-title {
  font-size: 1.6rem;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.3px;
}

.term-tagline {
  color: var(--text-secondary);
  font-size: 0.88rem;
  margin-top: 4px;
}

/* Right Card: Choices & Feedback */
.choices-card {
  background: var(--bg-card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border-glow);
  border-radius: 20px;
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.choices-prompt {
  margin-bottom: 18px;
}

.choices-prompt h3 {
  font-size: 1.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.choices-prompt p {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.options-stack {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  justify-content: center;
}

.choice-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  color: var(--text-primary);
  font-size: 1rem;
  font-weight: 600;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.choice-key {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.choice-btn:hover:not(:disabled) {
  background: rgba(0, 229, 255, 0.1);
  border-color: var(--cyan-glow);
  transform: translateX(4px);
  box-shadow: 0 4px 15px rgba(0, 229, 255, 0.2);
}

.choice-btn:hover:not(:disabled) .choice-key {
  background: var(--cyan-glow);
  color: #000;
}

/* Answer State Classes */
.choice-btn.correct {
  background: rgba(0, 230, 118, 0.25) !important;
  border-color: var(--emerald-glow) !important;
  color: #fff !important;
  box-shadow: 0 0 20px rgba(0, 230, 118, 0.5) !important;
  animation: correctPop 0.3s ease;
}

.choice-btn.correct .choice-key {
  background: var(--emerald-glow) !important;
  color: #000 !important;
}

.choice-btn.incorrect {
  background: rgba(255, 61, 113, 0.25) !important;
  border-color: var(--coral-red) !important;
  color: #fff !important;
  box-shadow: 0 0 20px rgba(255, 61, 113, 0.4) !important;
  animation: shake 0.3s ease;
}

.choice-btn.incorrect .choice-key {
  background: var(--coral-red) !important;
  color: #fff !important;
}

@keyframes correctPop {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-6px); }
  75% { transform: translateX(6px); }
}

/* Feedback Explanation Banner */
.feedback-box {
  margin-top: 16px;
  padding: 12px 16px;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.85rem;
  line-height: 1.4;
  display: none;
}

.feedback-box.show {
  display: block;
  animation: fadeIn 0.25s ease;
}

.feedback-box.correct-text {
  border-color: var(--emerald-glow);
  color: #a7f3d0;
}

.feedback-box.incorrect-text {
  border-color: var(--coral-red);
  color: #fecdd3;
}

/* Camera Snapshot Widget in Gameplay (optional quick selfie) */
.webcam-hud-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  margin-top: 14px;
  font-size: 0.82rem;
  color: var(--text-secondary);
}

.camera-snap-btn {
  padding: 6px 12px;
  border-radius: 8px;
  background: var(--cyan-glow);
  color: #000;
  font-weight: 700;
  font-size: 0.78rem;
  border: none;
  cursor: pointer;
}

/* RESULTS & KEEPSAKE SCREEN */
.results-card {
  max-width: 900px;
  margin: 0 auto;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-glow);
  border-radius: 24px;
  padding: 36px 32px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
  text-align: center;
}

.results-header-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(255, 214, 0, 0.15);
  border: 1px solid var(--amber-gold);
  border-radius: 20px;
  color: var(--amber-gold);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 1px;
  margin-bottom: 12px;
}

.results-title {
  font-size: 2.4rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.results-subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 24px;
}

/* 3-Star Award Display */
.stars-award-container {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 20px;
}

.award-star {
  font-size: 3.5rem;
  color: rgba(255, 255, 255, 0.15);
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.award-star.earned {
  color: var(--amber-gold);
  text-shadow: 0 0 25px rgba(255, 214, 0, 0.8);
  animation: starEarned 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

@keyframes starEarned {
  0% { transform: scale(0.3) rotate(-30deg); opacity: 0; }
  70% { transform: scale(1.3) rotate(15deg); }
  100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.award-rank-title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--cyan-glow);
  margin-bottom: 28px;
  letter-spacing: 0.5px;
}

/* Results Stats Row */
.results-stats-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}

.result-stat-box {
  background: rgba(0, 0, 0, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 16px;
}

.result-stat-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-secondary);
  font-weight: 700;
  margin-bottom: 4px;
}

.result-stat-num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 900;
  color: var(--text-primary);
}

/* Results Split: Keepsake Badge + Thermal Slip */
.keepsake-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  text-align: left;
  margin-bottom: 32px;
}

/* Left: Webcam Snapshot & Badge Card */
.webcam-badge-card {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.webcam-badge-card h4 {
  font-size: 1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.camera-preview-wrapper {
  position: relative;
  width: 100%;
  aspect-ratio: 4/3;
  background: #000;
  border-radius: 12px;
  overflow: hidden;
  border: 2px dashed rgba(255, 255, 255, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

#camera-video,
#photo-preview-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.camera-shutter-flash {
  position: absolute;
  inset: 0;
  background: #fff;
  opacity: 0;
  pointer-events: none;
}

.camera-shutter-flash.flash {
  animation: flashAnim 0.35s ease-out;
}

@keyframes flashAnim {
  0% { opacity: 0.9; }
  100% { opacity: 0; }
}

.camera-action-btns {
  display: flex;
  gap: 10px;
}

.camera-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.camera-btn.primary {
  background: var(--cyan-glow);
  color: #000;
}

.camera-btn.secondary {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

/* Right: POS-58 Thermal Receipt Keepsake Preview */
.receipt-wrapper {
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.thermal-receipt-paper {
  background: #fafafa;
  color: #111;
  font-family: var(--font-mono);
  padding: 20px 18px;
  border-radius: 4px;
  position: relative;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  font-size: 0.82rem;
  line-height: 1.4;
  filter: drop-shadow(0 4px 6px rgba(0,0,0,0.3));
}

/* Jagged Paper Tear Edges */
.thermal-receipt-paper::before,
.thermal-receipt-paper::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  height: 8px;
  background-size: 14px 8px;
}

.thermal-receipt-paper::before {
  top: -8px;
  background-image: radial-gradient(circle at 7px 8px, transparent 6px, #fafafa 7px);
}

.thermal-receipt-paper::after {
  bottom: -8px;
  background-image: radial-gradient(circle at 7px 0px, transparent 6px, #fafafa 7px);
}

.receipt-center {
  text-align: center;
}

.receipt-title {
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 1px;
}

.receipt-line {
  border-top: 1px dashed #444;
  margin: 8px 0;
}

.receipt-row {
  display: flex;
  justify-content: space-between;
}

.receipt-photo-box {
  width: 140px;
  height: 105px;
  margin: 10px auto;
  border: 1px solid #222;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #eee;
}

.receipt-photo-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%) contrast(160%);
}

.receipt-stars {
  font-size: 1.2rem;
  letter-spacing: 4px;
  font-weight: 900;
}

/* Thermal Printer Actions Bar */
.printer-actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.print-bt-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  background: linear-gradient(135deg, #0284c7, #0369a1);
  color: #fff;
  font-size: 1rem;
  font-weight: 800;
  border: none;
  cursor: pointer;
  transition: all 0.2s;
}

.print-bt-btn:hover {
  background: linear-gradient(135deg, #0ea5e9, #0284c7);
  box-shadow: 0 4px 18px rgba(2, 132, 199, 0.4);
}

.print-fallback-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 10px;
  color: var(--text-secondary);
  font-size: 0.85rem;
  cursor: pointer;
}

.print-fallback-btn:hover {
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.1);
}

/* Results Navigation Buttons */
.results-bottom-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
}

.action-btn.primary {
  background: linear-gradient(135deg, var(--cyan-glow), #00b4d8);
  color: #000;
}

.action-btn.secondary {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-primary);
}

.action-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* MODALS (Leaderboard & Bluetooth Config) */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 9999;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-overlay.open {
  display: flex;
  animation: fadeIn 0.2s ease;
}

.modal-box {
  background: #0f172a;
  border: 1px solid var(--border-glow);
  border-radius: 20px;
  max-width: 650px;
  width: 100%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 28px;
  box-shadow: 0 25px 60px rgba(0, 0, 0, 0.6);
  position: relative;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding-bottom: 14px;
}

.modal-header h3 {
  font-size: 1.35rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 10px;
}

.close-modal-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 24px;
  cursor: pointer;
  line-height: 1;
}

.close-modal-btn:hover {
  color: #fff;
}

/* Leaderboard Tabs */
.leaderboard-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
}

.tab-btn {
  padding: 8px 16px;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-secondary);
  font-weight: 700;
  font-size: 0.85rem;
  cursor: pointer;
}

.tab-btn.active {
  background: rgba(0, 229, 255, 0.15);
  border-color: var(--cyan-glow);
  color: var(--cyan-glow);
}

.leaderboard-table {
  width: 100%;
  border-collapse: collapse;
}

.leaderboard-table th {
  text-align: left;
  padding: 10px 12px;
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.leaderboard-table td {
  padding: 12px;
  font-size: 0.9rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.leaderboard-table tr:hover td {
  background: rgba(255, 255, 255, 0.03);
}

.rank-badge {
  font-weight: 900;
  font-size: 1rem;
}

.empty-leaderboard-msg {
  padding: 16px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 10px;
  border: 1px dashed rgba(255, 255, 255, 0.1);
}

.leaderboard-footer-tools {
  display: flex;
  gap: 10px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  flex-wrap: wrap;
}

.tool-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tool-btn:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--cyan-glow);
}

.tool-btn.danger {
  color: #f87171;
  border-color: rgba(248, 113, 113, 0.3);
}

.tool-btn.danger:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: #ef4444;
}

/* PRINT MEDIA QUERY (Strict 58mm Thermal Receipt Output) */
@media print {
  body * {
    visibility: hidden;
  }
  .thermal-receipt-paper,
  .thermal-receipt-paper * {
    visibility: visible;
  }
  .thermal-receipt-paper {
    position: absolute;
    left: 0;
    top: 0;
    width: 58mm !important;
    max-width: 58mm !important;
    padding: 2mm !important;
    box-shadow: none !important;
    border: none !important;
  }
  .thermal-receipt-paper::before,
  .thermal-receipt-paper::after {
    display: none !important;
  }
}

/* ============================================================
   RESPONSIVE & ANDROID TABLET PORTRAIT / VERTICAL KIOSK MODE
   ============================================================ */
@media (max-width: 1024px), (orientation: portrait) {
  .app-container {
    padding: 12px 14px;
    max-width: 100%;
  }

  .app-header {
    padding: 12px 16px;
  }

  .brand-text h1 {
    font-size: 1.15rem;
  }

  .brand-text p {
    font-size: 0.68rem;
  }

  .hero-title {
    font-size: clamp(2rem, 6vw, 2.8rem);
  }

  /* Vertical Portrait Kiosk Layout: Top visual, Bottom large touch answers */
  .gameplay-split {
    display: flex;
    flex-direction: column;
    gap: 14px;
    flex: 1;
  }

  .visual-card {
    padding: 16px 18px;
    border-radius: 18px;
  }

  .visual-display-area {
    min-height: 200px;
    max-height: 250px;
    margin-bottom: 12px;
  }

  .scientific-term-title {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }

  .choices-card {
    padding: 16px 18px;
    border-radius: 18px;
  }

  .choices-prompt {
    margin-bottom: 12px;
  }

  .choices-prompt h3 {
    font-size: 1.1rem;
  }

  /* Big chunky touch buttons for Android tablet fingers */
  .options-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }

  .choice-btn {
    min-height: 58px;
    padding: 14px 18px;
    font-size: 1.1rem;
    font-weight: 700;
    border-radius: 14px;
  }

  .choice-key {
    width: 36px;
    height: 36px;
    font-size: 1rem;
  }

  .keepsake-split {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .home-bottom-grid {
    grid-template-columns: 1fr;
  }
}

/* Extra touch target comfort on high-res portrait tablets */
@media (min-height: 900px) and (orientation: portrait) {
  .visual-display-area {
    min-height: 260px;
    max-height: 320px;
  }

  .choice-btn {
    min-height: 68px;
    font-size: 1.2rem;
    padding: 16px 22px;
  }
}