/* ============================================================
   NeuroFormation Atlas — Custom Design System
   Concept: Academic + Organic Warmth
   Palette: Deep indigo + warm amber + sage green
   ============================================================ */

:root, [data-theme="light"] {
  /* Surfaces */
  --color-bg:             #f6f4f0;
  --color-surface:        #faf9f6;
  --color-surface-2:      #ffffff;
  --color-surface-offset: #eeebe5;
  --color-surface-offset-2: #e6e2da;
  --color-divider:        #d8d4cc;
  --color-border:         #cdc9c0;

  /* Text */
  --color-text:           #1e1c17;
  --color-text-muted:     #6b6760;
  --color-text-faint:     #a8a49e;
  --color-text-inverse:   #f8f6f2;

  /* Primary Accent — Deep Indigo */
  --color-primary:        #3d4d8a;
  --color-primary-hover:  #2e3a6e;
  --color-primary-active: #212a52;
  --color-primary-highlight: #dde0f0;

  /* Network colors — distinct, accessible */
  --color-node-creativity: #7c4dbb;  /* Purple — DMN / imagination */
  --color-node-empathy:    #2a9d8f;  /* Teal — Mirror neurons */
  --color-node-attention:  #3d4d8a;  /* Indigo — PFC/CEN */
  --color-node-memory:     #e76f51;  /* Terracotta — Hippocampus */
  --color-node-salience:   #e9c46a;  /* Gold — Salience */
  --color-node-virtue:     #8fb89a;  /* Sage — vmPFC/Mentalizing */

  /* Evidence badges */
  --color-strong:         #2d6a4f;
  --color-strong-bg:      #d8f3dc;
  --color-moderate:       #b56a1e;
  --color-moderate-bg:    #fde8d0;
  --color-emerging:       #5c6bc0;
  --color-emerging-bg:    #e8eaf6;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Type */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Font families */
  --font-display: 'Zodiak', 'Georgia', serif;
  --font-body: 'Satoshi', 'system-ui', sans-serif;

  /* Shadows */
  --shadow-sm: 0 1px 3px oklch(0.2 0.03 60 / 0.07);
  --shadow-md: 0 4px 16px oklch(0.2 0.03 60 / 0.10);
  --shadow-lg: 0 12px 40px oklch(0.2 0.03 60 / 0.14);

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-default: 960px;
  --content-wide: 1200px;
}

/* DARK MODE */
[data-theme="dark"] {
  --color-bg:             #151310;
  --color-surface:        #1a1814;
  --color-surface-2:      #1f1d19;
  --color-surface-offset: #1d1b17;
  --color-surface-offset-2: #232119;
  --color-divider:        #2a2820;
  --color-border:         #38352c;
  --color-text:           #d4d0c8;
  --color-text-muted:     #807d76;
  --color-text-faint:     #57544f;
  --color-text-inverse:   #2a2820;
  --color-primary:        #8899d4;
  --color-primary-hover:  #6678bb;
  --color-primary-active: #4f5fa5;
  --color-primary-highlight: #262b44;

  --color-node-creativity: #b08ee8;
  --color-node-empathy:    #4ecdc4;
  --color-node-attention:  #8899d4;
  --color-node-memory:     #f4956c;
  --color-node-salience:   #f0d080;
  --color-node-virtue:     #9ec9ab;

  --color-strong:         #74c69d;
  --color-strong-bg:      #1b3d2c;
  --color-moderate:       #f4a261;
  --color-moderate-bg:    #3d2210;
  --color-emerging:       #9fa8da;
  --color-emerging-bg:    #1c2040;

  --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 16px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.45);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #151310;
    --color-surface: #1a1814;
    --color-surface-2: #1f1d19;
    --color-surface-offset: #1d1b17;
    --color-surface-offset-2: #232119;
    --color-divider: #2a2820;
    --color-border: #38352c;
    --color-text: #d4d0c8;
    --color-text-muted: #807d76;
    --color-text-faint: #57544f;
    --color-text-inverse: #2a2820;
    --color-primary: #8899d4;
    --color-primary-hover: #6678bb;
    --color-primary-active: #4f5fa5;
    --color-primary-highlight: #262b44;
    --color-node-creativity: #b08ee8;
    --color-node-empathy: #4ecdc4;
    --color-node-attention: #8899d4;
    --color-node-memory: #f4956c;
    --color-node-salience: #f0d080;
    --color-node-virtue: #9ec9ab;
    --color-strong: #74c69d;
    --color-strong-bg: #1b3d2c;
    --color-moderate: #f4a261;
    --color-moderate-bg: #3d2210;
    --color-emerging: #9fa8da;
    --color-emerging-bg: #1c2040;
    --shadow-sm: 0 1px 3px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 16px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 40px oklch(0 0 0 / 0.45);
  }
}

/* ============================================================
   BASE
   ============================================================ */

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

html {
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-interactive), color var(--transition-interactive);
}

img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
button { cursor: pointer; background: none; border: none; font: inherit; color: inherit; }
h1, h2, h3, h4 { text-wrap: balance; line-height: 1.15; font-family: var(--font-display); }
p { text-wrap: pretty; max-width: 72ch; }

a, button, [role="button"] {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive),
              opacity var(--transition-interactive);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.hidden { display: none !important; }

/* ============================================================
   HEADER
   ============================================================ */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in oklab, var(--color-bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-divider);
}

.header-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.logo-lockup {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.site-logo { flex-shrink: 0; color: var(--color-primary); }

.logo-name {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-text);
}

.logo-sub {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  letter-spacing: 0.03em;
}

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
  background: var(--color-surface-offset);
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  background: linear-gradient(in oklab, var(--color-bg) 0%, var(--color-surface-offset) 100%);
  border-bottom: 1px solid var(--color-divider);
  padding: clamp(var(--space-12), 8vw, var(--space-24)) var(--space-6);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 40% at 10% 50%, color-mix(in oklab, var(--color-node-creativity) 8%, transparent), transparent),
    radial-gradient(ellipse 50% 60% at 90% 20%, color-mix(in oklab, var(--color-node-empathy) 7%, transparent), transparent),
    radial-gradient(ellipse 40% 50% at 60% 80%, color-mix(in oklab, var(--color-node-memory) 6%, transparent), transparent);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--content-default);
  margin: 0 auto;
  position: relative;
}

.hero-eyebrow {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-4);
  max-width: none;
}

.hero-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  max-width: 18ch;
}

.hero-lead {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 60ch;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.stat-pill {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.stat-n {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
}

/* ============================================================
   FILTER SECTION
   ============================================================ */

.filter-section {
  padding: var(--space-10) var(--space-6);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  position: sticky;
  top: 65px;
  z-index: 50;
}

.filter-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.filter-heading {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.filter-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.filter-group {}

.filter-label {
  display: block;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.chip {
  padding: var(--space-1) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  white-space: nowrap;
}

.chip:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.chip.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

.results-meta {
  margin-top: var(--space-5);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

/* ============================================================
   LEGEND
   ============================================================ */

.legend-section {
  padding: var(--space-10) var(--space-6) var(--space-8);
  background: var(--color-bg);
}

.legend-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.legend-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

.legend-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}

.legend-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.legend-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
}

.legend-item strong {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.3;
}

.legend-item span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* ============================================================
   CARDS GRID
   ============================================================ */

.cards-section {
  padding: 0 var(--space-6) var(--space-16);
  background: var(--color-bg);
}

.cards-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-5);
}

/* CARD */
.card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-interactive),
              box-shadow var(--transition-interactive),
              border-color var(--transition-interactive);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-text-faint);
}

.card-accent-bar {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  border-radius: var(--radius-xl) 0 0 var(--radius-xl);
}

.card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
  padding-left: var(--space-3);
}

.card-network-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: color-mix(in oklab, var(--network-color, var(--color-primary)) 15%, var(--color-bg));
  color: var(--network-color, var(--color-primary));
  border: 1px solid color-mix(in oklab, var(--network-color, var(--color-primary)) 30%, var(--color-border));
  flex-shrink: 0;
}

.card-network-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--network-color, var(--color-primary));
  flex-shrink: 0;
}

.card-title {
  font-family: var(--font-display);
  font-size: clamp(1rem, 0.9rem + 0.5vw, 1.2rem);
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.25;
  flex: 1;
}

.card-virtue-tag {
  font-size: var(--text-xs);
  color: var(--color-node-virtue);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.card-virtue-tag::before {
  content: '✦';
  font-size: 9px;
}

.card-body {
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-footer {
  padding-left: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  margin-top: auto;
}

.evidence-badge {
  font-size: var(--text-xs);
  font-weight: 600;
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
}

.evidence-badge.strong {
  background: var(--color-strong-bg);
  color: var(--color-strong);
}

.evidence-badge.moderate {
  background: var(--color-moderate-bg);
  color: var(--color-moderate);
}

.evidence-badge.emerging {
  background: var(--color-emerging-bg);
  color: var(--color-emerging);
}

.age-tag {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  background: var(--color-surface-offset);
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
}

.card-more {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--color-primary);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: var(--space-20) var(--space-6);
  color: var(--color-text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.empty-state svg { opacity: 0.4; }
.empty-state p { max-width: 36ch; margin: 0 auto; }

/* ============================================================
   ABOUT SECTION
   ============================================================ */

.about-section {
  background: var(--color-surface-offset);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-16) var(--space-6);
}

.about-inner {
  max-width: var(--content-default);
  margin: 0 auto;
}

.about-inner h2 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-8);
  color: var(--color-text);
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-5);
}

.about-card {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
}

.about-card h3 {
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-3);
  color: var(--color-text);
  font-family: var(--font-display);
}

.about-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  padding: var(--space-8) var(--space-6);
}

.footer-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.footer-note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 56ch;
  font-style: italic;
}

.pplx-link {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
  border-bottom: 1px solid var(--color-border);
}

.pplx-link:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* ============================================================
   MODAL
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: oklch(0 0 0 / 0.5);
  backdrop-filter: blur(4px);
  z-index: 200;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0;
  animation: fadeIn 160ms ease;
}

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

@media (min-width: 600px) {
  .modal-overlay {
    align-items: center;
    padding: var(--space-6);
  }
}

.modal-box {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  max-width: 680px;
  width: 100%;
  max-height: 90dvh;
  overflow-y: auto;
  padding: var(--space-8) var(--space-6);
  position: relative;
  animation: slideUp 220ms cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 600px) {
  .modal-box {
    border-radius: var(--radius-2xl);
    max-height: 85dvh;
  }
}

@keyframes slideUp {
  from { transform: translateY(24px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.modal-close {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  line-height: 1;
  color: var(--color-text-muted);
}

.modal-close:hover {
  background: var(--color-surface-offset-2);
  color: var(--color-text);
}

/* Modal content styles */
.modal-network-pill {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-1) var(--space-4);
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}

#modal-title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
  line-height: 1.2;
}

.modal-subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  font-style: italic;
}

.modal-section {
  margin-bottom: var(--space-6);
}

.modal-section-title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
}

.modal-section p {
  font-size: var(--text-base);
  color: var(--color-text);
  line-height: 1.7;
}

.modal-section ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.modal-section li {
  font-size: var(--text-sm);
  color: var(--color-text);
  padding-left: var(--space-5);
  position: relative;
  line-height: 1.55;
}

.modal-section li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: 600;
}

.modal-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.modal-citations {
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-top: var(--space-6);
}

.modal-citations h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  font-family: var(--font-body);
}

.modal-citations ol {
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.modal-citations li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.modal-citations a {
  color: var(--color-primary);
  text-underline-offset: 2px;
  word-break: break-all;
}

/* ============================================================
   MOBILE RESPONSIVE
   ============================================================ */

@media (max-width: 600px) {
  .filter-section {
    position: static;
  }

  .cards-grid {
    grid-template-columns: 1fr;
  }

  .legend-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .hero-title {
    max-width: none;
  }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .header-inner {
    padding: var(--space-3) var(--space-4);
  }

  .logo-sub { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================================
   BRAIN MAPS SECTION
   ============================================================ */

.brain-maps-section {
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-divider);
  padding: clamp(var(--space-12), 6vw, var(--space-20)) var(--space-6);
}

.brain-maps-inner {
  max-width: var(--content-wide);
  margin: 0 auto;
}

.section-header {
  max-width: 680px;
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-3);
}

.section-lead {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 60ch;
}

/* Tabs */
.brain-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
  padding-bottom: var(--space-3);
}

.brain-tab {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  background: transparent;
  border: 1.5px solid var(--color-border);
  transition: all var(--transition-interactive);
}

.brain-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.brain-tab.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}

/* Panels */
.brain-panel {
  display: none;
}

.brain-panel.active {
  display: block;
  animation: fadeInUp 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.brain-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-8);
  align-items: start;
}

@media (max-width: 768px) {
  .brain-layout {
    grid-template-columns: 1fr;
  }
}

/* Canvas wrapper */
.brain-canvas-wrap {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.brain-canvas-container {
  width: 100%;
  min-height: 280px;
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.brain-canvas-container canvas {
  border-radius: var(--radius-xl);
  display: block !important;
}

.brain-hint {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  padding: var(--space-2) var(--space-4) var(--space-3);
  max-width: none;
}

/* Tooltip */
.brain-tooltip {
  position: absolute;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3) var(--space-4);
  max-width: 210px;
  pointer-events: none;
  z-index: 50;
  box-shadow: var(--shadow-md);
  font-size: var(--text-xs);
}

.brain-tooltip strong {
  display: block;
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
  line-height: 1.3;
}

.brain-tooltip p {
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: none;
}

/* Brain info panel */
.brain-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.brain-state-title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.2;
}

.brain-state-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: none;
}

/* Region list */
.region-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 260px;
  overflow-y: auto;
  padding-right: var(--space-2);
}

.region-list::-webkit-scrollbar {
  width: 4px;
}

.region-list::-webkit-scrollbar-track {
  background: var(--color-surface-offset);
  border-radius: var(--radius-full);
}

.region-list::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

.region-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  border: 1px solid transparent;
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}

.region-item.primary {
  background: var(--color-surface);
  border-color: var(--color-border);
}

.region-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 4px;
}

.region-item strong {
  display: block;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
  margin-bottom: 2px;
}

.region-item span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* Brain citations */
.brain-citations {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.brain-citations h4 {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
  font-family: var(--font-body);
}

.brain-citations ol {
  padding-left: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.brain-citations li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.55;
}

.brain-citations a {
  color: var(--color-primary);
  text-underline-offset: 2px;
}

/* Header nav */
.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-left: auto;
  margin-right: var(--space-4);
}

.nav-link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
}

.nav-link:hover {
  color: var(--color-text);
}

@media (max-width: 600px) {
  .header-nav { display: none; }
  .brain-tabs {
    gap: var(--space-1);
  }
  .brain-tab {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
  }
}

/* ============================================================
   MODE SWITCHER
   ============================================================ */

.mode-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

.mode-tag {
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  white-space: nowrap;
}

[data-mode='coaching'] .mode-tag {
  color: var(--coaching-accent);
}

.mode-toggle-btn {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1.5px solid var(--color-primary);
  background: transparent;
  color: var(--color-primary);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s, border-color 0.15s, box-shadow 0.15s;
}

.mode-toggle-btn:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

[data-mode='coaching'] .mode-toggle-btn {
  border-color: var(--coaching-accent);
  color: var(--coaching-accent);
}

[data-mode='coaching'] .mode-toggle-btn:hover {
  background: var(--coaching-accent);
  color: #fff;
}

@media (max-width: 760px) {
  .mode-switcher { gap: var(--space-1); }
  .mode-tag { display: none; }
  .mode-toggle-btn {
    font-size: 10px;
    padding: var(--space-1) var(--space-3);
  }
}

/* ============================================================
   COACHING MODE — Visual Accent Override
   Applied when data-mode="coaching" on <html>
   ============================================================ */

:root {
  --coaching-accent:       #1a3a5c;  /* Deep navy */
  --coaching-accent-mid:   #2c5282;  /* Mid navy */
  --coaching-accent-light: #dce8f5;  /* Sky tint */
  --coaching-accent-glow:  #bee3f8;  /* Highlight */
}

/* Header bar gets a subtle coaching indicator */
[data-mode='coaching'] .site-header {
  border-bottom-color: var(--coaching-accent);
  border-bottom-width: 2px;
}

/* Hero eyebrow in coaching mode */
[data-mode='coaching'] .hero-eyebrow {
  color: var(--coaching-accent-mid);
  border-color: color-mix(in oklab, var(--coaching-accent-mid) 40%, transparent);
}

/* Primary accent override in coaching mode */
[data-mode='coaching'] .brain-tab.active {
  background: var(--coaching-accent);
  border-color: var(--coaching-accent);
  color: #fff;
}

[data-mode='coaching'] .brain-tab:hover:not(.active) {
  border-color: var(--coaching-accent-mid);
  color: var(--coaching-accent-mid);
}

/* Filter chips active state */
[data-mode='coaching'] .chip.active {
  background: var(--coaching-accent);
  color: #fff;
  border-color: var(--coaching-accent);
}

[data-mode='coaching'] .chip:hover:not(.active) {
  border-color: var(--coaching-accent-mid);
  color: var(--coaching-accent-mid);
}

/* Card accent bars pulse slightly in coaching mode to signal the mode */
[data-mode='coaching'] .card:hover {
  box-shadow: 0 0 0 1.5px color-mix(in oklab, var(--coaching-accent) 25%, transparent),
              0 8px 32px color-mix(in oklab, var(--coaching-accent) 12%, transparent);
}

/* Modal section title in coaching mode */
[data-mode='coaching'] .modal-section-title {
  color: var(--coaching-accent-mid);
}

/* Coaching mode banner strip under hero stats */
[data-mode='coaching'] .hero {
  background: linear-gradient(in oklab,
    color-mix(in oklab, #dce8f5 60%, var(--color-bg)) 0%,
    var(--color-bg) 100%
  );
}

/* Legend section gets coaching accent border */
[data-mode='coaching'] .legend-section {
  border-top: 2px solid var(--coaching-accent-light);
}