@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
  /* Color Palette - Museum Exhibit Theme */
  --bg-warm: #faf8f5;          /* Warm organic off-white */
  --bg-navy: #0c1222;          /* Deep scientific navy */
  --bg-navy-light: #161e31;    /* Slightly lighter navy for cards */
  --bg-white: #ffffff;
  
  --accent-neuro: #0a8491;     /* Disciplined neuroscience teal */
  --accent-neuro-light: rgba(10, 132, 145, 0.1);
  --accent-neuro-dark: #075f69;
  
  --text-navy: #0c1222;        /* High-contrast charcoal navy */
  --text-warm: #faf8f5;        /* Warm text for dark backgrounds */
  --text-muted-dark: #828a9b;  /* Muted text on dark backgrounds */
  --text-muted-light: #64748b; /* Muted text on light backgrounds */
  
  --border-subtle: #e5e0d8;    /* Soft warm gray border */
  --border-subtle-dark: rgba(255, 255, 255, 0.1);
  
  /* System Spacing */
  --spacing-section-spacious: 120px;
  --spacing-section-dense: 60px;
  
  /* Layout Transitions */
  --transition-smooth: 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --reading-width: 65ch;       /* Optimum legibility length */
}

/* Reset & Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-warm);
  color: var(--text-navy);
  font-family: 'Inter', sans-serif;
  line-height: 1.75;
  overflow-x: hidden;
  position: relative;
  -webkit-font-smoothing: antialiased;
}

/* Base Typographic Rhythm */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Outfit', sans-serif;
  color: var(--text-navy);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
}

h3 {
  font-size: 1.4rem;
  font-weight: 600;
}

p {
  color: var(--text-muted-light);
}

a {
  color: var(--accent-neuro);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--transition-smooth);
}
a:hover {
  color: var(--accent-neuro-dark);
}

/* Layout Core Elements */
header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  padding: 0 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-navy);
  border-bottom: 1px solid var(--border-subtle-dark);
  z-index: 1000;
  transition: background var(--transition-smooth);
}

header .logo-container {
  display: flex;
  align-items: center;
  gap: 15px;
}

header .logo-img {
  height: 38px;
  width: auto;
  border-radius: 4px;
}

header .logo-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-warm);
  letter-spacing: -0.01em;
}

header nav.desktop-nav {
  display: flex;
  gap: 30px;
}
@media (max-width: 950px) {
  header nav.desktop-nav {
    display: none;
  }
}

header nav.desktop-nav a {
  color: var(--text-muted-dark);
  font-weight: 500;
  font-size: 0.95rem;
  padding: 6px 0;
  position: relative;
}
header nav.desktop-nav a:hover, header nav.desktop-nav a.active {
  color: var(--text-warm);
}
header nav.desktop-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-neuro);
  transition: width var(--transition-smooth);
}
header nav.desktop-nav a:hover::after, header nav.desktop-nav a.active::after {
  width: 100%;
}

.menu-button {
  background: transparent;
  border: 1px solid var(--border-subtle-dark);
  color: var(--text-warm);
  width: 44px;
  height: 44px;
  border-radius: 6px;
  display: none; /* hidden by default; shown only on mobile */
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  cursor: pointer;
  z-index: 1100;
  transition: all var(--transition-smooth);
}
@media (max-width: 950px) {
  .menu-button {
    display: flex;
  }
}
.menu-button:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.3);
}
.menu-button:focus {
  outline: none;
}

/* Glass-free solid museum drawer */
#menu-overlay {
  position: fixed;
  top: 0;
  right: -320px;
  width: 320px;
  height: 100vh;
  background: var(--bg-navy);
  border-left: 1px solid var(--border-subtle-dark);
  display: flex;
  flex-direction: column;
  padding: 100px 40px;
  z-index: 1050;
  transition: right 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
#menu-overlay.active {
  right: 0;
}

#menu-overlay a {
  color: var(--text-muted-dark);
  font-family: 'Outfit', sans-serif;
  font-size: 1.3rem;
  font-weight: 600;
  margin: 15px 0;
  transition: all var(--transition-smooth);
}
#menu-overlay a:hover {
  color: var(--text-warm);
  padding-left: 10px;
}

main {
  margin-top: 80px;
}

/* Spacious visual layout sections */
.section {
  padding: var(--spacing-section-spacious) 40px;
  max-width: 1200px;
  margin: 0 auto;
}
@media (max-width: 768px) {
  .section {
    padding: var(--spacing-section-dense) 20px;
  }
}

/* Alternate dark layout sections for museum exhibit pacing */
.section-dark {
  background-color: var(--bg-navy);
  color: var(--text-warm);
}
.section-dark h1, .section-dark h2, .section-dark h3, .section-dark h4 {
  color: var(--text-warm);
}
.section-dark p {
  color: var(--text-muted-dark);
}

.section-header {
  text-align: left; /* Left alignment over centered defaults */
  max-width: 800px;
  margin-bottom: 60px;
}
.section-header h2 {
  margin-bottom: 20px;
}

/* Section title / subtitle utility (used by multiple pages) */
.section-title {
  font-family: 'Outfit', sans-serif;
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  color: var(--text-navy);
  margin-bottom: 15px;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-muted-light);
  max-width: 65ch;
  line-height: 1.7;
}

/* gradient-text → flat teal accent (no rainbow) */
.gradient-text {
  color: var(--accent-neuro);
}

/* glass-panel compatibility shim → now maps to museum-card styling */
.glass-panel {
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
}

/* CTA strip section (dark navy band) */
.cta {
  background: var(--bg-navy);
  padding: 100px 40px;
}
.cta-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: left;
}
.cta-content h2 {
  color: var(--text-warm);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  margin-bottom: 20px;
}
.cta-content p {
  color: var(--text-muted-dark);
  font-size: 1.1rem;
  max-width: 55ch;
  margin-bottom: 35px;
}
@media (max-width: 768px) {
  .cta {
    padding: 70px 20px;
  }
}

/* Impact note small caption */
.impact-note {
  font-size: 0.9rem;
  color: var(--text-muted-light);
  text-align: left;
  margin-top: 10px;
}

/* Asymmetric Grid Layout Utilities */
.asymmetric-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}
@media (max-width: 900px) {
  .asymmetric-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* Educational Reading Column for WCAG legibility */
.reading-column {
  max-width: var(--reading-width);
  margin-bottom: 30px;
}
.reading-column p {
  margin-bottom: 25px;
  font-size: 1.05rem;
}

/* Flat, solid bordered museum placards (No Glassmorphism, No excessive shadow) */
.museum-card {
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  padding: 40px;
  transition: border-color var(--transition-smooth), transform var(--transition-smooth);
}
.museum-card:hover {
  border-color: var(--accent-neuro);
  transform: translateY(-2px);
}

.section-dark .museum-card {
  background: var(--bg-navy-light);
  border-color: var(--border-subtle-dark);
}
.section-dark .museum-card:hover {
  border-color: var(--accent-neuro);
}

/* Flat Buttons (No rainbow gradients, solid clean layouts) */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-family: 'Outfit', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--transition-smooth);
  border: none;
  outline: none;
}

.btn-primary {
  background: var(--accent-neuro);
  color: var(--text-warm);
}
.btn-primary:hover {
  background: var(--accent-neuro-dark);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-navy);
}
.btn-secondary:hover {
  background: rgba(12, 18, 34, 0.03);
  border-color: var(--text-navy);
}

.section-dark .btn-secondary {
  border-color: var(--border-subtle-dark);
  color: var(--text-warm);
}
.section-dark .btn-secondary:hover {
  background: rgba(250, 248, 245, 0.05);
  border-color: var(--text-warm);
}

/* Spaciously Asymmetric Hero (Museum Entryway) */
.hero {
  padding: 120px 40px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start; /* Asymmetric left alignment */
  text-align: left;
}
.hero h1 {
  max-width: 800px;
  margin-bottom: 25px;
}
.hero p {
  font-size: 1.25rem;
  max-width: 600px;
  margin-bottom: 40px;
  color: var(--text-muted-light);
}
@media (max-width: 768px) {
  .hero {
    padding: 80px 20px;
  }
}

/* Feature grid components */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
}

.feature {
  padding: 40px;
}

.feature-icon-wrapper {
  width: 56px;
  height: 56px;
  border-radius: 6px;
  background: var(--accent-neuro-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 30px;
}

.feature-icon-wrapper svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-neuro);
  stroke-width: 2px;
  fill: none;
}

.feature h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

/* Dense science data counter sheet */
.impact-report {
  max-width: 1100px;
  margin: 0 auto;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.impact-item {
  padding: 30px;
  border-radius: 6px;
  border-left: 3px solid var(--accent-neuro);
}

.impact-item h3 {
  font-size: 3.5rem;
  font-weight: 800;
  color: var(--accent-neuro);
  margin-bottom: 5px;
}

.impact-item p {
  color: var(--text-muted-light);
  font-weight: 600;
  font-size: 0.95rem;
}

.section-dark .impact-item p {
  color: var(--text-muted-dark);
}

/* Team Bios Profiles (Asymmetric alignments) */
.team-members {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 40px;
  margin-top: 40px;
}

.team-member {
  padding: 40px;
  text-align: left;
}

.team-member img {
  width: 100px;
  height: 100px;
  border-radius: 6px;
  object-fit: cover;
  margin-bottom: 25px;
  border: 1px solid var(--border-subtle);
}

.team-member h3 {
  font-size: 1.3rem;
  margin-bottom: 6px;
}

.team-member p.role {
  color: var(--accent-neuro);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 15px;
}

/* Lobe page tab slider selector (warm light layout style) */
.tab-container {
  max-width: 900px;
  margin: 0 auto;
}

.toggle-buttons {
  display: flex;
  gap: 10px;
  margin-bottom: 40px;
  background: var(--border-subtle);
  padding: 6px;
  border-radius: 8px;
  width: fit-content;
}

.toggle-buttons button {
  background: transparent;
  border: none;
  color: var(--text-muted-light);
  padding: 10px 24px;
  border-radius: 6px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  cursor: pointer;
  transition: all var(--transition-smooth);
}
.toggle-buttons button:hover {
  color: var(--text-navy);
}
.toggle-buttons button.active {
  background: var(--bg-warm);
  color: var(--text-navy);
}

.text-panel {
  display: none;
  font-size: 1.05rem;
  line-height: 1.8;
}
.text-panel.active {
  display: block;
  animation: fadeIn var(--transition-smooth);
}

.text-panel p {
  margin-bottom: 20px;
}

.text-panel p:first-of-type {
  font-size: 1.2rem;
  color: var(--text-navy);
  font-weight: 500;
}

/* Exhibition Directory layout grid */
.brain-regions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 30px;
}

.region-link {
  padding: 30px;
  text-align: left;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
}

.region-link a {
  font-family: 'Outfit', sans-serif;
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-navy);
}

.region-link:hover a {
  color: var(--accent-neuro);
}

/* Hover cards (flat, no glassmorphism, no shadow) */
.hover-card {
  margin-top: 15px;
  font-size: 0.85rem;
  color: var(--text-muted-light);
  border-top: 1px solid var(--border-subtle);
  padding-top: 15px;
}

/* Flat Forms for contact & model request */
.form-container {
  max-width: 650px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 25px;
}

.form-group label {
  display: block;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.95rem;
  margin-bottom: 8px;
  color: var(--text-navy);
}

.form-control {
  width: 100%;
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
  border-radius: 6px;
  padding: 14px 16px;
  color: var(--text-navy);
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition-smooth);
}
.form-control:focus {
  border-color: var(--accent-neuro);
}

textarea.form-control {
  min-height: 140px;
  resize: vertical;
}

/* Flat kiosk diagnostic applications (Games & Quiz) */
.game-panel {
  max-width: 600px;
  margin: 40px auto;
  padding: 40px;
  border-radius: 8px;
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
}

.game-title {
  font-size: 1.8rem;
  margin-bottom: 10px;
  text-align: left;
}
.game-desc {
  font-size: 0.95rem;
  color: var(--text-muted-light);
  margin-bottom: 30px;
  text-align: left;
}

.game-stage {
  width: 100%;
  min-height: 280px;
  border-radius: 6px;
  background: var(--bg-warm);
  border: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  margin-bottom: 25px;
  padding: 25px;
  position: relative;
}

.game-info-badge {
  background: var(--bg-navy);
  color: var(--text-warm);
  padding: 6px 14px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  margin-top: 15px;
}

/* Flat Latency Sensor board */
.reaction-arena {
  width: 100%;
  height: 200px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  transition: all var(--transition-smooth);
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
}
.reaction-arena.state-waiting {
  background: #fef2f2;
  border-color: #fca5a5;
  color: #ef4444;
}
.reaction-arena.state-ready {
  background: #ecfdf5;
  border-color: #6ee7b7;
  color: #059669;
}
.reaction-text {
  font-family: 'Outfit', sans-serif;
  font-size: 1.4rem;
  font-weight: 800;
  color: inherit;
}

/* Flat Circle opaque Simon segments */
.simon-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 15px;
  width: 220px;
  height: 220px;
}
.simon-node {
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all 0.1s ease;
  opacity: 0.4;
}
.simon-node:hover {
  opacity: 0.6;
}
.simon-node:active, .simon-node.lit {
  opacity: 1;
  transform: scale(0.96);
}
.simon-node.node-blue { background: #0066cc; }
.simon-node.node-purple { background: #6600cc; }
.simon-node.node-cyan { background: #009999; }
.simon-node.node-magenta { background: #cc0066; }

/* Typographic Focus board */
.focus-board {
  width: 100%;
  height: 250px;
  position: relative;
  overflow: hidden;
  cursor: crosshair;
}
.focus-target {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: 0.95rem;
  cursor: pointer;
  user-select: none;
  animation: floatNode 3.5s infinite alternate ease-in-out;
  border: 1px solid var(--border-subtle);
  background: var(--bg-white);
  color: var(--text-muted-light);
}
.focus-target.target-active {
  background: var(--accent-neuro);
  color: var(--text-warm);
  border-color: var(--accent-neuro);
}

/* Spacious Quiz Deck Placard */
.quiz-card {
  max-width: 650px;
  width: 100%;
  padding: 50px 40px;
}

.quiz-progress-container {
  width: 100%;
  height: 4px;
  background: var(--border-subtle);
  border-radius: 2px;
  margin-bottom: 30px;
  overflow: hidden;
}
.quiz-progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent-neuro);
  transition: width var(--transition-smooth);
}

.quiz-meta {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted-light);
  font-weight: 700;
  font-family: 'Outfit', sans-serif;
  margin-bottom: 15px;
}

.quiz-question {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 35px;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 15px;
  margin-bottom: 35px;
}

.quiz-option {
  display: flex;
  align-items: center;
  padding: 16px 20px;
  border-radius: 6px;
  background: var(--bg-warm);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: all var(--transition-smooth);
  user-select: none;
}
.quiz-option:hover {
  background: var(--bg-white);
  border-color: var(--text-navy);
}
.quiz-option input[type="radio"] {
  display: none;
}
.quiz-option-indicator {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-subtle);
  margin-right: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-smooth);
  flex-shrink: 0;
  background: var(--bg-white);
}
.quiz-option-text {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted-light);
}

.quiz-option:hover .quiz-option-text {
  color: var(--text-navy);
}

.quiz-option.selected {
  border-color: var(--accent-neuro);
  background: var(--bg-white);
}
.quiz-option.selected .quiz-option-indicator {
  border-color: var(--accent-neuro);
  background: var(--accent-neuro);
}
.quiz-option.selected .quiz-option-indicator::after {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--bg-warm);
  border-radius: 50%;
}
.quiz-option.selected .quiz-option-text {
  color: var(--text-navy);
  font-weight: 700;
}

/* Custom Overlay dialogue (Flat solid placards, high contrast) */
.custom-modal-backdrop {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: rgba(12, 18, 34, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  animation: fadeIn 0.2s ease-out;
}

.custom-modal {
  max-width: 420px;
  width: 90%;
  padding: 40px;
  text-align: center;
  border-radius: 8px;
  background: var(--bg-white);
  border: 1px solid var(--border-subtle);
  animation: scaleUp 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.custom-modal h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}
.custom-modal p {
  color: var(--text-muted-light);
  font-size: 0.95rem;
  margin-bottom: 30px;
}

/* Scientific Museum Footer */
footer {
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-white);
  padding: 60px 40px;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-muted-light);
}
footer a {
  color: var(--text-muted-light);
  margin: 0 12px;
}
footer a:hover {
  color: var(--text-navy);
}

/* Keyframe Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleUp {
  from { transform: scale(0.95); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

@keyframes floatNode {
  0% { transform: translateY(0) rotate(0deg); }
  100% { transform: translateY(-8px) rotate(3deg); }
}

.loader-wrapper {
  position: fixed;
  top: 0; left: 0; width: 100%; height: 100%;
  background: var(--bg-warm);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 99999;
  transition: opacity var(--transition-smooth);
}
.loader {
  width: 40px;
  height: 40px;
  border: 2px solid var(--border-subtle);
  border-radius: 50%;
  border-top-color: var(--accent-neuro);
  animation: spin 0.8s infinite linear;
}

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

/* ============================================================
   LEGACY VARIABLE ALIASES
   Maps old colour names used in early pages to the new system
   ============================================================ */
:root {
  --text-secondary:   var(--text-muted-light);
  --bg-tertiary:      var(--bg-warm);
  --grad-primary:     var(--accent-neuro);
  --accent-magenta:   var(--accent-neuro);
  --accent-purple:    var(--accent-neuro-dark);
}

/* ============================================================
   FORM SELECT ELEMENT STYLING
   ============================================================ */
select.form-control {
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%2364748b' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: 40px;
  cursor: pointer;
  background-color: var(--bg-white);
}
select.form-control option {
  background: var(--bg-white);
  color: var(--text-navy);
}

/* ============================================================
   MOBILE MENU BACKDROP (tap outside to close)
   ============================================================ */
#menu-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(12, 18, 34, 0.5);
  z-index: 1040;
}
#menu-backdrop.active {
  display: block;
}

/* ============================================================
   HEADER — tighter padding on small screens
   ============================================================ */
@media (max-width: 600px) {
  header {
    padding: 0 20px;
  }
  header .logo-text {
    font-size: 1.2rem;
  }
}

/* ============================================================
   FOOTER — responsive
   ============================================================ */
@media (max-width: 768px) {
  footer {
    padding: 40px 20px;
  }
}

/* ============================================================
   IMPACT GRID — 2-column on very small screens
   ============================================================ */
@media (max-width: 600px) {
  .impact-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .impact-item h3 {
    font-size: 2.5rem;
  }
}

/* ============================================================
   REGION PAGES — content + sidebar collapse on mobile
   ============================================================ */
@media (max-width: 900px) {
  .region-page-grid {
    grid-template-columns: 1fr !important;
    gap: 40px !important;
  }
  .region-page-grid aside {
    order: 2;
  }
  /* Inline grids on region pages that don't use class */
  section.section > div[style*="grid-template-columns: 1fr 300px"] {
    display: block !important;
  }
  section.section > div[style*="grid-template-columns: 1fr 300px"] > div,
  section.section > div[style*="grid-template-columns: 1fr 300px"] > aside {
    width: 100% !important;
    max-width: 100% !important;
    margin-bottom: 30px;
  }
}

/* ============================================================
   GAMES PAGE — 2-col card grid collapses
   ============================================================ */
@media (max-width: 700px) {
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 30px"] {
    display: block !important;
  }
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 30px"] > div {
    margin-bottom: 20px;
  }
  div[style*="grid-template-columns: repeat(3, 1fr)"] {
    display: block !important;
  }
  div[style*="grid-template-columns: repeat(3, 1fr)"] > div {
    margin-bottom: 24px;
  }
}

/* ============================================================
   INDEX PAGE — Brain Regions Preview + For Teachers
   ============================================================ */
@media (max-width: 900px) {
  /* "Eight regions" section (1fr 1.4fr) */
  div[style*="grid-template-columns: 1fr 1.4fr"] {
    display: block !important;
  }
  div[style*="grid-template-columns: 1fr 1.4fr"] > div {
    width: 100% !important;
    margin-bottom: 30px;
  }
  /* The 2-column region tile grid inside */
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 15px"] {
    display: grid !important;
    grid-template-columns: 1fr 1fr !important;
  }
  /* "For Teachers" section (1.4fr 1fr) */
  div[style*="grid-template-columns: 1.4fr 1fr"] {
    display: block !important;
  }
  div[style*="grid-template-columns: 1.4fr 1fr"] > div {
    width: 100% !important;
    margin-bottom: 30px;
  }
}

@media (max-width: 500px) {
  /* Small phones: region tile grid collapses to 1 col */
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 15px"] {
    grid-template-columns: 1fr !important;
  }
  /* Motor Cortex span 2 tile */
  a[style*="grid-column: span 2"] {
    grid-column: span 1 !important;
  }
}

/* ============================================================
   ABOUT PAGE — mission grid (1fr 1.6fr) collapses
   ============================================================ */
@media (max-width: 900px) {
  div[style*="grid-template-columns: 1fr 1.6fr"] {
    display: block !important;
  }
  div[style*="grid-template-columns: 1fr 1.6fr"] > div {
    width: 100% !important;
    margin-bottom: 25px;
  }
  /* Principles grid (repeat(auto-fit, minmax(260px,1fr))) — already responsive */
}

/* ============================================================
   EXPLORE NAV — orientation footer 2-col grid
   ============================================================ */
@media (max-width: 700px) {
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 60px"] {
    display: block !important;
  }
  div[style*="grid-template-columns: 1fr 1fr"][style*="gap: 60px"] > div {
    margin-bottom: 25px;
  }
}

/* ============================================================
   TOGGLE BUTTONS — full width on mobile
   ============================================================ */
@media (max-width: 600px) {
  .toggle-buttons {
    width: 100%;
    display: flex;
  }
  .toggle-buttons button {
    flex: 1;
    padding: 10px 10px;
    font-size: 0.82rem;
  }
}

/* ============================================================
   FEATURES GRID — enforce single col on phones
   ============================================================ */
@media (max-width: 600px) {
  .features {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   HERO — button row wraps properly on mobile
   ============================================================ */
@media (max-width: 600px) {
  .hero {
    padding: 70px 20px 50px;
  }
  .hero h1 {
    font-size: 2rem;
  }
  .hero p {
    font-size: 1rem;
  }
}

/* ============================================================
   FORM PAGES — full-width container, reduced padding
   ============================================================ */
@media (max-width: 700px) {
  .form-container {
    max-width: 100%;
  }
  .glass-panel {
    padding: 28px 20px;
    border-radius: 8px;
  }
}

/* ============================================================
   REQUEST MODEL — address city/state row stacks
   ============================================================ */
@media (max-width: 600px) {
  .address-city-state {
    flex-direction: column !important;
  }
}

/* ============================================================
   SECTION general spacing on mobile
   ============================================================ */
@media (max-width: 600px) {
  .section-subtitle {
    max-width: 100%;
    font-size: 1rem;
  }
  .section-header {
    margin-bottom: 30px;
  }
  h3 {
    font-size: 1.2rem;
  }
}

/* ============================================================
   QUIZ / GAME PANELS
   ============================================================ */
@media (max-width: 700px) {
  .game-panel,
  .quiz-card {
    padding: 28px 18px;
  }
}

/* ============================================================
   BRAIN REGIONS GRID on explore page
   ============================================================ */
@media (max-width: 500px) {
  .brain-regions {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   CTA BAND
   ============================================================ */
@media (max-width: 500px) {
  .cta-content h2 {
    font-size: 1.5rem;
  }
}