:root {
  --bg: #f7f5f2;
  --surface: #ffffff;
  --surface-2: #f1ede9;
  --stage: #e2deda;
  --text: #2a2522;
  --muted: #6b625c;
  --line: #ddd6cf;
  --brand: #1f4e79;
  --brand-2: #e2a03f;
  --accent: #d2445f;
  --accent-soft: #f4b2bd;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.05), 0 6px 20px rgba(0,0,0,.06);
  --glow: rgba(255,255,255,.6);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #18171a; --surface: #222125; --surface-2: #2a292e; --stage: #2b2a2e;
    --text: #ece7e3; --muted: #a69d97; --line: #3a383d; --brand: #8ab8e6; --brand-2: #f0b45a;
    --accent: #ff6b86; --accent-soft: #a8566a; --glow: rgba(255,255,255,.07);
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 20px rgba(0,0,0,.3);
  }
}
:root[data-theme="dark"] {
  --bg: #18171a; --surface: #222125; --surface-2: #2a292e; --stage: #2b2a2e;
  --text: #ece7e3; --muted: #a69d97; --line: #3a383d; --brand: #8ab8e6; --brand-2: #f0b45a;
  --accent: #ff6b86; --accent-soft: #a8566a; --glow: rgba(255,255,255,.07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 70px; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 Inter, system-ui, sans-serif; -webkit-font-smoothing: antialiased; }
h1, h2, h3 { font-family: Fraunces, Georgia, serif; line-height: 1.2; margin: 0; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--brand); }

/* Top bar */
.topbar { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px; padding: 12px 24px; background: var(--surface); border-bottom: 1px solid var(--line); }
.logo { font-family: Fraunces, serif; font-size: 28px; font-weight: 700; text-decoration: none; color: var(--brand); letter-spacing: -.5px; }
.logo span { color: var(--brand-2); }
.nav { display: flex; gap: 4px; margin-left: auto; overflow-x: auto; scrollbar-width: none; }
.nav a { text-decoration: none; color: var(--text); font-weight: 700; font-size: 13px; text-transform: uppercase; letter-spacing: .04em; padding: 8px 12px; border-radius: 8px; white-space: nowrap; }
.nav a:hover { background: var(--surface-2); }

/* Explorer */
.explore { background: var(--stage); padding-bottom: 20px; }
.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; padding: 10px 16px; background: var(--surface); border-bottom: 1px solid var(--line); }
#regionSelect { min-width: 240px; padding: 8px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface-2); font-weight: 600; }
.seg { display: inline-flex; background: var(--surface-2); border: 1px solid var(--line); border-radius: 10px; padding: 3px; }
.seg-btn { border: 0; background: none; padding: 6px 14px; border-radius: 7px; cursor: pointer; font-weight: 600; font-size: 14px; color: var(--muted); }
.seg-btn.active { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.12); }
.tools { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.tool { border: 1px solid var(--line); background: var(--surface); padding: 7px 12px; border-radius: 8px; cursor: pointer; font-size: 14px; font-weight: 600; display: inline-flex; align-items: center; }
.tool:hover { background: var(--surface-2); }
.tool[aria-pressed="true"] { background: var(--brand); color: #fff; border-color: var(--brand); }

.explore-grid { display: grid; grid-template-columns: minmax(300px, 420px) 1fr; gap: 20px; padding: 20px 24px 0; max-width: 1400px; margin: 0 auto; }
.panel { background: var(--surface); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; max-height: 640px; overflow-y: auto; }
.panel h2 { font-size: 30px; margin: 4px 0 6px; }
.panel h3 { font-family: Inter, sans-serif; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--muted); margin: 20px 0 6px; }
.panel p, .panel li { font-size: 15px; }
.panel ul { margin: 0; padding-left: 18px; }
.panel li { margin: 3px 0; }
.kicker { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); }
.where { color: var(--muted); font-size: 14px; margin: 0 0 12px; }
.lead { font-size: 16px !important; margin: 0; }
.fact { margin-top: 18px; background: var(--surface-2); border-left: 4px solid var(--brand-2); padding: 12px 14px; border-radius: 8px; font-size: 14px; }
.tips-list li::marker { color: var(--accent); }
.notes { width: 100%; min-height: 80px; border: 1px solid var(--line); border-radius: 8px; padding: 10px; background: var(--surface-2); resize: vertical; font-size: 14px; }
.panel-nav { display: flex; justify-content: space-between; gap: 8px; margin-top: 18px; }
.panel-nav button { flex: 1; }
.intro p { color: var(--text); }
.intro .how { background: var(--surface-2); border-radius: 10px; padding: 12px 14px; font-size: 14px; margin-top: 14px; }

.stage-wrap { position: relative; display: flex; flex-direction: column; border-radius: var(--radius); background: radial-gradient(ellipse at 50% 42%, var(--glow), transparent 68%); }
.stage-wrap:fullscreen { background: var(--stage) radial-gradient(ellipse at 50% 42%, var(--glow), transparent 68%); padding: 16px; }
.stage { position: relative; flex: 1; min-height: 600px; display: flex; align-items: center; justify-content: center; }
.stage-wrap:fullscreen .stage { min-height: calc(100vh - 70px); }
.stage svg { width: 100%; height: auto; max-height: 640px; display: block; }
.stage-loading { color: var(--muted); font-size: 15px; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .4; } }
.brain-canvas { position: absolute; inset: 0; width: 100%; height: 100%; display: block; cursor: grab; touch-action: none; outline: none; }
.brain-canvas:active { cursor: grabbing; }
.labels3d { position: absolute; inset: 0; pointer-events: none; overflow: hidden; }
.l3d { position: absolute; left: 0; top: 0; font: 600 11px Inter, sans-serif; color: #2a1f1f; background: rgba(255,255,255,.85); padding: 1px 7px; border-radius: 999px; white-space: nowrap; box-shadow: 0 1px 4px rgba(0,0,0,.18); will-change: transform; }
.l3d.sel { background: var(--accent); color: #fff; font-size: 13px; z-index: 2; }
.stage-hint { text-align: center; color: var(--muted); font-size: 13px; margin: 0; }
.tooltip { position: absolute; pointer-events: none; background: var(--surface); color: var(--text); border: 1px solid var(--line); padding: 6px 12px; border-radius: 6px; font-size: 16px; box-shadow: var(--shadow); white-space: nowrap; transform: translate(-50%, calc(-100% - 14px)); z-index: 5; }

/* SVG brain */
.region { fill: var(--n); stroke: rgba(120, 50, 50, .08); stroke-width: 1; cursor: pointer; transition: fill .2s, filter .2s; outline: none; }
.brain.colored .region { fill: var(--c); stroke: rgba(255, 255, 255, .7); }
.region:hover, .region:focus-visible { filter: brightness(1.1) saturate(1.1); }
.region.child { fill: var(--accent-soft) !important; }
.region.active { fill: var(--accent) !important; filter: drop-shadow(0 0 6px rgba(210, 68, 95, .6)); }
.region.dashed { stroke-dasharray: 5 3; stroke-width: 1.5; stroke: rgba(90, 40, 40, .6); fill-opacity: .8; }
.base { fill: #f1c6ae; pointer-events: none; }
.brain.colored .base { fill: #eadfd6; }
.deco { fill: none; stroke: #c0475f; stroke-opacity: .5; stroke-width: 2.2; stroke-linecap: round; pointer-events: none; }
.deco.major { stroke-width: 3; stroke-opacity: .6; }
.deco.thin { stroke-width: 1.4; }
.deco.folia { stroke: #a24c5c; stroke-opacity: .4; stroke-width: 1.6; }
.deco.arbor { stroke: #fff; stroke-opacity: .75; stroke-width: 2; }
.shade, .outline { pointer-events: none; }
.outline { fill: none; stroke: rgba(120, 50, 50, .5); stroke-width: 1.5; }
.lbl { font: 600 11px Inter, sans-serif; fill: #3b2a2a; text-anchor: middle; paint-order: stroke; stroke: rgba(255,255,255,.85); stroke-width: 3px; pointer-events: none; opacity: 0; transition: opacity .2s; }
.brain.show-labels .lbl, .lbl.show { opacity: 1; }
.lbl.show { font-size: 13px; }

/* Chips */
.region-index { max-width: 1400px; margin: 16px auto 0; padding: 0 24px; }
#search { width: 100%; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 10px; }
.chip { border: 1px solid var(--line); background: var(--surface); padding: 4px 11px; border-radius: 999px; font-size: 13px; font-weight: 500; cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.chip .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 6px; vertical-align: 1px; }

/* Sections */
.section { padding: 64px 24px; }
.section.alt { background: var(--surface-2); }
.wrap { max-width: 1200px; margin: 0 auto; }
.wrap.narrow { max-width: 720px; }
.eyebrow { text-transform: uppercase; letter-spacing: .1em; font-size: 12px; font-weight: 700; color: var(--accent); margin: 0 0 6px; }
.section h2 { font-size: clamp(30px, 4vw, 42px); }
.sub { color: var(--muted); max-width: 640px; margin: 8px 0 28px; }
.h3 { font-size: 24px; margin: 48px 0 16px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.tiny { font-size: 12px; }

.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 10px; }
.card h3 { font-size: 21px; }
.card p { margin: 0; font-size: 15px; }
.card .insight { font-size: 14px; color: var(--muted); border-top: 1px dashed var(--line); padding-top: 10px; margin-top: auto; }
.card .chips { margin-top: 0; }

.myths { display: grid; gap: 10px; }
.myth { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; display: grid; grid-template-columns: 1fr 1.6fr; gap: 16px; }
.myth b { display: block; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 2px; }
.myth .m b { color: var(--accent); }
.myth .f b { color: #2e8b57; }
.myth .m { text-decoration: line-through; text-decoration-color: rgba(210,68,95,.5); }

.chem-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; }
.chem { background: var(--surface); border-radius: var(--radius); padding: 18px; border: 1px solid var(--line); }
.chem h3 { font-size: 20px; margin-bottom: 6px; }
.chem p { margin: 0 0 8px; font-size: 15px; }
.chem .note { font-size: 13px; color: var(--muted); margin: 0; }

.tips-layout { display: grid; grid-template-columns: 1fr 320px; gap: 24px; align-items: start; }
.tip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.tip-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.tip-card h3 { font-size: 20px; margin-bottom: 8px; }
.tip-card dl { margin: 0; }
.tip-card dt { font-weight: 600; font-size: 15px; margin-top: 10px; }
.tip-card dd { margin: 2px 0 0; color: var(--muted); font-size: 14px; }
.tracker { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; position: sticky; top: 84px; }
.tracker h3 { font-size: 20px; }
.habit-list { display: grid; gap: 6px; margin: 10px 0 14px; }
.habit-list label { display: flex; gap: 10px; align-items: center; padding: 8px 10px; border-radius: 8px; background: var(--surface-2); cursor: pointer; font-size: 14px; }
.habit-list input { accent-color: var(--accent); width: 18px; height: 18px; }
.progress { height: 8px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
#habitBar { height: 100%; width: 0; background: linear-gradient(90deg, var(--brand-2), var(--accent)); transition: width .3s; }
.week { display: flex; gap: 6px; margin: 10px 0 4px; }
.day { flex: 1; text-align: center; font-size: 11px; color: var(--muted); }
.day i { display: block; height: 26px; border-radius: 6px; background: var(--surface-2); margin-bottom: 3px; }

/* Quiz */
.quiz { background: var(--surface); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow); }
.quiz .qmeta { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; }
.quiz .clue { font-family: Fraunces, serif; font-size: 23px; margin: 12px 0 20px; line-height: 1.3; }
.options { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.opt { border: 1px solid var(--line); background: var(--surface-2); padding: 12px 14px; border-radius: 10px; cursor: pointer; text-align: left; font-weight: 600; }
.opt:hover:not(:disabled) { border-color: var(--brand); }
.opt.right { background: #d9f2e2; border-color: #2e8b57; color: #1d5c3a; }
.opt.wrong { background: #fbdde2; border-color: var(--accent); color: #8a2238; }
.opt:disabled { cursor: default; }
.explain { margin-top: 16px; font-size: 15px; background: var(--surface-2); padding: 12px 14px; border-radius: 10px; }
.btn { border: 0; background: var(--brand); color: #fff; padding: 10px 18px; border-radius: 10px; font-weight: 600; cursor: pointer; }
.btn.ghost { background: transparent; color: var(--brand); border: 1px solid var(--line); }
.btn-row { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.score { font-family: Fraunces, serif; font-size: 48px; margin: 8px 0; }

.footer { text-align: center; padding: 28px 16px; color: var(--muted); font-size: 13px; border-top: 1px solid var(--line); }

/* Responsive */
@media (max-width: 900px) {
  .explore-grid { grid-template-columns: 1fr; padding: 16px 16px 0; }
  .stage-wrap { order: -1; }
  .stage { min-height: 62vh; }
  .panel { max-height: none; }
  .tips-layout { grid-template-columns: 1fr; }
  .tracker { position: static; }
  .region-index { padding: 0 16px; }
}
@media (max-width: 640px) {
  .topbar { flex-wrap: wrap; gap: 4px; padding: 10px 16px; }
  .nav { margin-left: 0; width: 100%; }
  .toolbar { padding: 10px 16px; }
  #regionSelect { min-width: 0; width: 100%; }
  .tools { margin-left: 0; }
  .section { padding: 48px 16px; }
  .options { grid-template-columns: 1fr; }
  .myth { grid-template-columns: 1fr; gap: 6px; }
  .quiz { padding: 20px; }
}
[hidden] { display: none !important; }