/* styles.css - Little Scientist World
 * A premium, lightweight educational science adventure
 * Mobile-first responsive design, high contrast, accessibility, zero dependencies
 */

:root {
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --bg-app: #F0F4F8;
  --bg-surface: #FFFFFF;
  --bg-card: #FFFFFF;
  --text-main: #1A202C;
  --text-muted: #4A5568;
  --text-light: #718096;
  
  --primary: #2B6CB0;
  --primary-hover: #2C5282;
  --primary-light: #EBF8FF;
  
  --accent-green: #2F855A;
  --accent-green-light: #F0FFF4;
  --accent-amber: #DD6B20;
  --accent-amber-light: #FFFAF0;
  --accent-purple: #6B46C1;
  --accent-purple-light: #FAF5FF;
  --accent-teal: #285E61;
  --accent-red: #C53030;
  --accent-red-light: #FFF5F5;

  --border-color: #E2E8F0;
  --border-focus: #3182CE;
  
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  
  --transition-fast: 0.15s ease-out;
  --transition-normal: 0.25s ease-out;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Accessibility Skip Link & Live Regions */
.skip-link {
  position: absolute;
  top: -40px;
  left: 12px;
  background: var(--primary);
  color: #FFF;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
  font-weight: 600;
  transition: top var(--transition-fast);
}
.skip-link:focus {
  top: 12px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus Styling */
:focus-visible {
  outline: 3px solid var(--border-focus);
  outline-offset: 2px;
}

/* Application Layout */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 2px solid var(--border-color);
  padding: 8px 16px;
}

.header-inner {
  max-width: 1024px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.brand-button {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--primary);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
}

.brand-icon {
  font-size: 1.4rem;
}

.header-status-bar {
  display: flex;
  align-items: center;
  gap: 10px;
}

.stat-chip {
  display: flex;
  align-items: center;
  gap: 4px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.btn-icon:hover {
  background: var(--primary-light);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-icon svg {
  width: 20px;
  height: 20px;
}

/* Bottom Navigation Bar (Mobile-first friendly) */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-surface);
  border-top: 2px solid var(--border-color);
  z-index: 90;
  display: flex;
  justify-content: space-around;
  padding: 6px 12px;
  box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.05);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-width: 60px;
}

.nav-item svg {
  width: 22px;
  height: 22px;
}

.nav-item.active {
  color: var(--primary);
  background: var(--primary-light);
}

/* Main Content Area */
.app-main {
  flex: 1;
  max-width: 1024px;
  width: 100%;
  margin: 0 auto;
  padding: 16px 16px 84px; /* Space for bottom nav */
}

/* Screens */
.game-screen {
  animation: fadeIn 0.25s ease-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* General Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px;
}

.btn-primary {
  background: var(--primary);
  color: #FFF;
  box-shadow: 0 4px 10px rgba(43, 108, 176, 0.3);
}
.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #EDF2F7;
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover:not(:disabled) {
  background: #E2E8F0;
}

.btn-danger {
  background: var(--accent-red);
  color: #FFF;
}
.btn-danger:hover:not(:disabled) {
  background: #9B2C2C;
}

.btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

/* ==========================================
 * SCREEN 1: WELCOME SCREEN
 * ========================================== */
.welcome-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 12px 12px 28px;
  gap: 20px;
}

.welcome-hero {
  position: relative;
  width: 100%;
  max-width: 680px;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.hero-image-wrapper {
  width: 100%;
  position: relative;
  overflow: hidden;
  max-height: 380px;
}

.welcome-hero-img {
  width: 100%;
  height: 100%;
  max-height: 380px;
  object-fit: cover;
  display: block;
  transition: transform 0.4s ease;
}

.welcome-hero:hover .welcome-hero-img {
  transform: scale(1.02);
}

.hero-text-content {
  padding: 20px 24px 24px;
}

.hero-title {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--primary);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.5;
}

.welcome-actions {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 360px;
  gap: 12px;
}

.btn-large {
  padding: 16px 28px;
  font-size: 1.2rem;
}

.btn-glow {
  box-shadow: 0 0 20px rgba(43, 108, 176, 0.45);
  animation: gentlePulse 2.5s infinite;
}

@keyframes gentlePulse {
  0%, 100% { box-shadow: 0 0 16px rgba(43, 108, 176, 0.4); }
  50% { box-shadow: 0 0 28px rgba(43, 108, 176, 0.7); }
}

.welcome-parent-link {
  margin-top: 6px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: underline;
  cursor: pointer;
  padding: 6px 12px;
}
.welcome-parent-link:hover {
  color: var(--primary);
}

/* ==========================================
 * SCREEN 2: WORLD MAP & REGION IMAGES
 * ========================================== */
.region-card-img-wrap {
  position: relative;
  width: 100%;
  height: 160px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.region-card-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}

.region-card:hover .region-card-img {
  transform: scale(1.05);
}

.region-badge-pill {
  position: absolute;
  bottom: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(4px);
  color: #FFF;
  font-size: 0.85rem;
  font-weight: 800;
  padding: 4px 10px;
  border-radius: var(--radius-full);
}

/* Region Hero Banner */
.region-hero-banner-wrap {
  position: relative;
  width: 100%;
  height: 240px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 12px;
  box-shadow: var(--shadow-md);
}

.region-hero-banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.region-hero-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.82) 100%);
  color: #FFF;
  padding: 30px 18px 16px;
}

.region-hero-overlay h2 {
  font-size: 1.6rem;
  font-weight: 900;
  margin-bottom: 4px;
}

.region-hero-overlay p {
  font-size: 0.95rem;
  opacity: 0.92;
  line-height: 1.4;
}

/* ==========================================
 * SCREEN 2: WORLD MAP
 * ========================================== */
.map-header {
  margin-bottom: 16px;
}

.map-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
}

.regions-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 640px) {
  .regions-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .regions-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.region-card {
  position: relative;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 2px solid var(--border-color);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.region-card:hover:not(.locked) {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.region-card.locked {
  opacity: 0.75;
  background: #F7FAFC;
  filter: grayscale(0.2);
}

.region-badge-icon {
  font-size: 2.5rem;
  line-height: 1;
}

.region-info h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 4px;
}

.region-tagline {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 6px;
}

.region-desc {
  font-size: 0.9rem;
  color: var(--text-main);
}

.region-progress-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  font-weight: 600;
}

.region-lock-notice {
  font-size: 0.8rem;
  color: var(--accent-red);
  background: var(--accent-red-light);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* ==========================================
 * SCREEN 3: REGION EXPLORATION & MISSIONS
 * ========================================== */
.region-view-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.region-view-hero {
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 2px solid var(--border-color);
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}

.landmarks-row {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 14px;
}

.landmark-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--border-color);
  padding: 10px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  font-weight: 700;
  text-align: left;
  transition: all var(--transition-fast);
}
.landmark-btn:hover {
  background: #FFF;
  border-color: var(--primary);
  transform: translateX(4px);
}

.landmark-icon {
  font-size: 1.5rem;
}

.landmark-dialog {
  border: none;
  border-radius: var(--radius-lg);
  max-width: 480px;
  width: 90%;
  margin: auto;
  padding: 24px;
  box-shadow: var(--shadow-lg);
}
.landmark-dialog::backdrop {
  background: rgba(0, 0, 0, 0.4);
}

.missions-section h3 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
}

.missions-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.mission-card {
  display: flex;
  align-items: center;
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  gap: 16px;
  transition: all var(--transition-fast);
}

.mission-card-thumb {
  width: 80px;
  height: 64px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

.mission-thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.mission-card-info {
  flex: 1;
}

.mission-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.mission-card.completed {
  border-left: 6px solid var(--accent-green);
}

.mission-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.mission-sub {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================
 * SCREEN 4 & 5: MISSION BRIEFING & EXPERIMENT
 * ========================================== */
.briefing-box {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
  overflow: hidden;
}

.briefing-img-wrap {
  width: 100%;
  height: 220px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}

.briefing-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.sim-reveal-banner-wrap {
  width: 100%;
  max-width: 480px;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin: 14px 0;
  box-shadow: var(--shadow-md);
  animation: fadeIn 0.4s ease-out;
}

.sim-reveal-img {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  display: block;
}

.briefing-objectives {
  margin: 16px 0;
  padding-left: 20px;
}

.briefing-objectives li {
  margin-bottom: 6px;
  color: var(--text-muted);
}

.nova-bubble {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  padding: 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}

.nova-bubble-avatar {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
}

/* Simulation Stages & Controls */
.sim-wrapper {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sim-stage {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  box-shadow: var(--shadow-sm);
}

.sim-controls-panel {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sim-feedback-card {
  margin-top: 14px;
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-md);
  background: #EDF2F7;
  color: var(--text-main);
  font-size: 0.95rem;
  text-align: center;
}

.alert-success {
  background: var(--accent-green-light);
  color: #22543D;
  border: 1px solid #9AE6B4;
}

.alert-warning {
  background: #FFFAF0;
  color: #7B341E;
  border: 1px solid #FBD38D;
}

.alert-info {
  background: var(--primary-light);
  color: #2A4365;
  border: 1px solid #BEE3F8;
}

.sim-actions-bar {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--border-color);
}

/* Selection Grid (Plant Needs) */
.selection-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
  margin-top: 12px;
}

.select-chip-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 12px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #FFF;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.select-chip-btn:hover {
  border-color: var(--primary);
}
.select-chip-btn.selected {
  border-color: var(--primary);
  background: var(--primary-light);
  font-weight: 700;
}

.chip-icon {
  font-size: 2rem;
}

/* Sequencing Rows (Life cycles, seed, solar system) */
.sequence-slots-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
  width: 100%;
  margin: 16px 0;
}

.sequence-slot {
  flex: 1 1 120px;
  max-width: 140px;
  min-height: 110px;
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px;
  position: relative;
  background: #F7FAFC;
  cursor: pointer;
}

.slot-number {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 0.75rem;
  font-weight: 800;
  color: var(--text-light);
}

.slot-content.filled {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
}

.slot-item-icon {
  font-size: 1.8rem;
}

.pool-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  margin-top: 10px;
}

.pool-item-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px;
  background: #FFF;
  cursor: pointer;
  transition: all var(--transition-fast);
}
.pool-item-card:hover:not(.placed) {
  border-color: var(--primary);
  transform: translateY(-2px);
}
.pool-item-card.placed {
  opacity: 0.35;
  cursor: default;
}

.pool-item-card .item-icon {
  font-size: 1.8rem;
}
.pool-item-card .item-title {
  font-size: 0.85rem;
  font-weight: 700;
}
.pool-item-card .item-desc {
  font-size: 0.75rem;
  color: var(--text-light);
  margin-top: 2px;
}

/* Water Tank & Buoyancy */
.tank-container {
  width: 100%;
  max-width: 400px;
  height: 200px;
  border: 3px solid #63B3ED;
  border-radius: var(--radius-md);
  position: relative;
  background: linear-gradient(180deg, #EBF8FF 0%, #BEE3F8 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
}

.tank-water {
  width: 100%;
  height: 75%;
  background: rgba(49, 130, 206, 0.25);
  border-top: 2px dashed #3182CE;
  position: relative;
  display: flex;
  justify-content: center;
}

.water-surface-line {
  position: absolute;
  top: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  color: #2B6CB0;
}

.tank-drop-target {
  position: absolute;
  top: 10px;
  font-size: 2rem;
  transition: all 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.tank-drop-target.floating {
  top: 15px;
}
.tank-drop-target.sunken {
  top: 75%;
}

.object-select-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 10px 0;
}

.btn-obj-select {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 8px 12px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #FFF;
  cursor: pointer;
}
.btn-obj-select.active {
  border-color: var(--primary);
  background: var(--primary-light);
}

.prediction-buttons-row {
  display: flex;
  gap: 12px;
  margin: 10px 0;
}

/* Water Filter Assembly */
.filter-column-assembly {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 220px;
}

.filter-top-funnel {
  padding: 6px 14px;
  background: #E2E8F0;
  border-radius: 8px 8px 0 0;
  font-weight: 700;
  font-size: 0.85rem;
}

.filter-tube {
  width: 100%;
  border: 3px solid #CBD5E0;
  display: flex;
  flex-direction: column;
  background: #FFF;
}

.filter-tube-layer {
  padding: 10px;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  border-bottom: 1px solid #E2E8F0;
}
.filter-tube-layer.empty {
  color: #A0AEC0;
  background: #F7FAFC;
}
.filter-tube-layer.filled {
  background: #EBF8FF;
  color: #2B6CB0;
  font-weight: 700;
}

.filter-collection-beaker {
  margin-top: 10px;
  padding: 10px 16px;
  border: 2px solid #CBD5E0;
  border-radius: 0 0 12px 12px;
  width: 100%;
  text-align: center;
  font-weight: 700;
}

.filter-media-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
  margin-top: 8px;
}

.btn-filter-media {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 10px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: #FFF;
  cursor: pointer;
  text-align: center;
}
.btn-filter-media.used {
  opacity: 0.4;
  cursor: default;
}

/* Matching Columns */
.matching-columns-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 12px;
}

.matching-col {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.match-item-btn {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  background: #FFF;
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 600;
  text-align: left;
}
.match-item-btn.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}
.match-item-btn.matched {
  border-color: var(--accent-green);
  background: var(--accent-green-light);
  cursor: default;
}

/* Circuit Builder */
.circuit-breadboard {
  width: 100%;
  max-width: 440px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding: 20px;
  background: #2D3748;
  border-radius: var(--radius-md);
  color: #FFF;
}

.circuit-comp {
  padding: 12px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-weight: 700;
  background: #4A5568;
}

.circuit-comp.switch.open {
  background: #742A2A;
  border: 2px dashed #FC8181;
  cursor: pointer;
}
.circuit-comp.switch.closed {
  background: #22543D;
  border: 2px solid #68D391;
  cursor: pointer;
}

.circuit-comp.bulb.lit {
  background: #D69E2E;
  color: #744210;
  box-shadow: 0 0 20px #FAF089;
}

.circuit-wire-line {
  grid-column: span 2;
  height: 8px;
  background: #718096;
  border-radius: 4px;
  text-align: center;
  font-size: 0.65rem;
  line-height: 8px;
}
.circuit-wire-line.connected {
  background: #ECC94B;
  box-shadow: 0 0 8px #ECC94B;
}

/* Day Night Globe */
.rotating-earth-container {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  border: 4px solid #4A5568;
  margin: 16px auto;
  position: relative;
  overflow: hidden;
}

.earth-sphere {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  transition: transform 0.4s ease;
}

.earth-day-side {
  width: 50%;
  height: 100%;
  background: #4299E1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFF;
  font-weight: 700;
}
.earth-night-side {
  width: 50%;
  height: 100%;
  background: #1A202C;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #ECC94B;
  font-weight: 700;
}

.city-pin {
  position: absolute;
  top: 40%;
  left: 35%;
  background: rgba(255, 255, 255, 0.9);
  color: #000;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.7rem;
  font-weight: 800;
}

/* Safety Banner */
.safety-warning-banner {
  margin: 16px 0;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--accent-red-light);
  border: 1px solid #FEB2B2;
  color: var(--accent-red);
  font-size: 0.9rem;
}

/* ==========================================
 * SCREEN 6: DISCOVERY RESULTS
 * ========================================== */
.result-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  box-shadow: var(--shadow-md);
}

.result-pip-celebrate {
  width: 90px;
  height: 90px;
}

.result-reward-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 8px 16px;
  border-radius: var(--radius-full);
  font-weight: 800;
}

.result-explanation-box {
  background: #F7FAFC;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  text-align: left;
  line-height: 1.6;
}

/* ==========================================
 * SCREEN 7: SCIENCE JOURNAL
 * ========================================== */
.journal-wrapper {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.journal-header h2 {
  font-size: 1.5rem;
  font-weight: 800;
}

.journal-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-muted);
  font-weight: 600;
  cursor: pointer;
  font-size: 0.85rem;
}
.tab-btn.active {
  background: var(--primary);
  color: #FFF;
  border-color: var(--primary);
}

.journal-cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

@media (min-width: 640px) {
  .journal-cards-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.journal-entry-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
}

.entry-card-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 10px;
}

.entry-icon {
  font-size: 1.8rem;
}

.entry-category {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.entry-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.entry-date {
  margin-left: auto;
  font-size: 0.75rem;
  color: var(--text-light);
}

.entry-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================
 * SCREEN 8: LABORATORY
 * ========================================== */
.lab-room-stage {
  background: linear-gradient(180deg, #EDF2F7 0%, #E2E8F0 100%);
  border: 3px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px 16px;
  box-shadow: var(--shadow-md);
}

.lab-wall-decorations {
  display: flex;
  justify-content: space-between;
  margin-bottom: 24px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.workbench-surface {
  background: #C05621;
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: 0 8px 0 #7B341E;
}

.workbench-slots-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 12px;
}

.lab-slot-card {
  background: #FFF;
  border: 2px solid #ED8936;
  border-radius: var(--radius-sm);
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 6px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.slot-badge {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--text-light);
}

.slot-apparatus-icon {
  font-size: 2.2rem;
}

.slot-apparatus-name {
  font-size: 0.8rem;
  font-weight: 700;
  line-height: 1.2;
}

.btn-slot-action {
  font-size: 0.75rem;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: #F7FAFC;
  cursor: pointer;
}

.workbench-legs {
  display: flex;
  justify-content: space-between;
  padding: 0 40px;
}

.bench-leg {
  width: 24px;
  height: 40px;
  background: #7B341E;
}

/* Modal Picker */
.lab-picker-dialog {
  border: none;
  border-radius: var(--radius-lg);
  max-width: 500px;
  width: 90%;
  margin: auto;
  box-shadow: var(--shadow-lg);
}
.lab-picker-dialog::backdrop {
  background: rgba(0, 0, 0, 0.5);
}

.dialog-inner {
  padding: 20px;
}

.dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.btn-close-dialog {
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  padding: 4px 8px;
}

.inventory-items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 10px;
}

.btn-inventory-choice {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px;
  background: #FFF;
  cursor: pointer;
}
.btn-inventory-choice:hover {
  border-color: var(--primary);
}

/* ==========================================
 * SCREEN 9: ACHIEVEMENTS & PROGRESS
 * ========================================== */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.badge-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 8px;
}

.badge-card.unearned {
  opacity: 0.45;
  filter: grayscale(1);
}

.badge-icon-frame {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  background: #F7FAFC;
  border: 2px solid var(--border-color);
}

.badge-title {
  font-size: 1rem;
  font-weight: 800;
}

.badge-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* ==========================================
 * SCREEN 10: PARENT DASHBOARD & GATE
 * ========================================== */
.parent-gate-card {
  max-width: 440px;
  margin: 40px auto;
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.gate-icon {
  font-size: 3rem;
  margin-bottom: 10px;
}

.gate-disclaimer {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin: 10px 0;
}

.gate-subnote {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.form-input {
  width: 100%;
  padding: 12px;
  font-size: 1.2rem;
  text-align: center;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  margin: 12px 0;
}

.gate-error {
  color: var(--accent-red);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.parent-dashboard-wrapper {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.dashboard-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

@media (min-width: 768px) {
  .dashboard-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.dash-card {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  box-shadow: var(--shadow-sm);
}

.card-title-icon {
  font-size: 1.15rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.stats-summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin: 12px 0;
}

.stat-pill {
  background: var(--primary-light);
  border-radius: var(--radius-md);
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.stat-num {
  font-size: 1.3rem;
  font-weight: 900;
  color: var(--primary);
}

.stat-lbl {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
}

.profile-options-column {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 10px;
}

.profile-radio-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 10px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.privacy-list {
  list-style: none;
  font-size: 0.9rem;
  margin: 10px 0;
}
.privacy-list li {
  margin-bottom: 6px;
}

.danger-zone-box {
  margin-top: 16px;
  padding: 12px;
  border-top: 1px solid var(--border-color);
}

.offline-activities-section {
  background: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.activities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 14px;
}

@media (min-width: 640px) {
  .activities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.activity-card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  background: #F7FAFC;
}

.act-steps {
  margin: 8px 0 8px 18px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ==========================================
 * SCREEN 11: HEALTHY BREAK REMINDER SCREEN
 * ========================================== */
.break-reminder-card {
  max-width: 480px;
  margin: 30px auto;
  background: var(--bg-surface);
  border: 3px solid var(--primary);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.break-icon {
  font-size: 3.5rem;
  margin-bottom: 12px;
}

/* Reduced Motion Mode Support */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .tank-drop-target {
    transition: none !important;
  }
}