/* /brain — language-tuned typography + atlas 3D motion.
 * Scoped under body.brain. Grep style.css before any short global class. */

body.brain {
  --brain-soft: color-mix(in srgb, var(--accent, #0d9488) 14%, transparent);
  --br-depth: 28px;
  --br-ease: cubic-bezier(.22, 1, .36, 1);
  --br-font-display: "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  --br-font-body: "Segoe UI", "Helvetica Neue", system-ui, sans-serif;
  --br-tracking: -0.012em;
  --br-leading: 1.58;
  --br-title-leading: 1.18;
  --br-teal: #0d9488;
  --br-slate: #334155;
}

html[lang^="ko"] body.brain {
  --br-font-display: "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --br-font-body: "Apple SD Gothic Neo", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --br-tracking: -0.025em;
  --br-leading: 1.72;
  --br-title-leading: 1.36;
}
html[lang^="ja"] body.brain {
  --br-font-display: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  --br-font-body: "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", Meiryo, sans-serif;
  --br-tracking: 0.02em;
  --br-leading: 1.78;
  --br-title-leading: 1.42;
}
html[lang^="zh"] body.brain {
  --br-font-display: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --br-font-body: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --br-tracking: 0.01em;
  --br-leading: 1.72;
  --br-title-leading: 1.36;
}
html[lang="ru"] body.brain {
  --br-font-display: "Segoe UI", "PT Sans", "Helvetica Neue", Arial, sans-serif;
  --br-font-body: "Segoe UI", "PT Sans", Arial, sans-serif;
  --br-tracking: 0;
  --br-leading: 1.62;
}
html[lang="de"] body.brain,
html[lang="es"] body.brain,
html[lang="fr"] body.brain,
html[lang="pt-BR"] body.brain,
html[lang="pt"] body.brain {
  --br-font-display: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --br-tracking: -0.018em;
  --br-leading: 1.6;
}
html[lang="de"] body.brain h1,
html[lang="de"] body.brain h2,
html[lang="de"] body.brain .br-label {
  overflow-wrap: anywhere;
  hyphens: auto;
}

body.brain,
body.brain .lede,
body.brain .sub,
body.brain p,
body.brain .section-intro {
  font-family: var(--br-font-body);
  letter-spacing: var(--br-tracking);
  line-height: var(--br-leading);
}
body.brain h1,
body.brain h2,
body.brain h3,
body.brain .kicker {
  font-family: var(--br-font-display);
  line-height: var(--br-title-leading);
  letter-spacing: var(--br-tracking);
}

html[lang^="ko"] body.brain,
html[lang^="ja"] body.brain,
html[lang^="zh"] body.brain {
  font-size: 1.02rem;
}
html[lang^="ko"] body.brain h1,
html[lang^="ja"] body.brain h1,
html[lang^="zh"] body.brain h1 {
  word-break: keep-all;
}

/* ---------- home atmosphere ---------- */
body.brain .br-home-hero,
body.brain .br-hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(1100px 460px at 8% -12%, var(--brain-soft), transparent 58%),
    radial-gradient(860px 400px at 92% 0%, color-mix(in srgb, #334155 22%, transparent), transparent 55%),
    linear-gradient(165deg, #0b1f24 0%, #12353c 40%, #0f766e 100%);
  color: #f0fdfa;
}
body.brain .br-home-hero .lede,
body.brain .br-home-hero .crumbs a,
body.brain .br-home-hero .kicker,
body.brain .br-hero .lede,
body.brain .br-hero .crumbs a,
body.brain .br-hero .kicker { color: #ccfbf1; }
body.brain .br-home-hero h1,
body.brain .br-hero h1 { color: #fff; text-wrap: balance; }

body.brain .topic-card .jc-meter i,
body.brain .jc-meter i {
  background: linear-gradient(90deg, var(--accent, #0d9488), var(--accent2, #134e4a));
}

/* ---------- 3D stage ---------- */
body.brain .br-stage-wrap {
  perspective: 1200px;
  margin: 1.25rem 0 0.5rem;
  max-width: 420px;
}
body.brain .br-stage {
  --br-tilt-x: 8deg;
  --br-tilt-y: -12deg;
  position: relative;
  min-height: 150px;
  transform-style: preserve-3d;
  transform: rotateX(var(--br-tilt-x)) rotateY(var(--br-tilt-y));
  transition: transform .5s var(--br-ease);
  border-radius: 22px;
  background:
    radial-gradient(60% 80% at 50% 120%, rgba(20, 184, 166, .32), transparent 70%),
    linear-gradient(180deg, rgba(255, 255, 255, .08), rgba(255, 255, 255, .02));
  border: 1px solid rgba(255, 255, 255, .12);
  overflow: hidden;
}
body.brain .br-stage-floor {
  position: absolute;
  inset: auto 10% 14% 10%;
  height: 40%;
  border-radius: 50%;
  background: radial-gradient(ellipse at center, rgba(45, 212, 191, .32), transparent 70%);
  filter: blur(2px);
  transform: translateZ(-20px);
}
body.brain .br-stage-orb {
  position: absolute;
  width: 72px; height: 72px;
  left: 38%; top: 28%;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 28%, #5eead4, #0f766e 62%, #134e4a);
  box-shadow: 0 18px 40px rgba(0, 0, 0, .28);
  transform: translateZ(28px);
}
body.brain .br-stage-orb-2 {
  width: 36px; height: 36px;
  left: 58%; top: 42%;
  opacity: .85;
  transform: translateZ(48px);
  background: radial-gradient(circle at 30% 28%, #99f6e4, #334155 70%);
}

/* ---------- atlas chart ---------- */
body.brain .br-chart {
  position: relative;
  border-radius: 18px;
  background:
    radial-gradient(80% 60% at 50% 0%, color-mix(in srgb, #0d9488 12%, transparent), transparent 70%),
    linear-gradient(180deg, #f8fafc, #e2e8f0);
  border: 1px solid color-mix(in srgb, #0d9488 18%, #cbd5e1);
  padding: .75rem;
  transform-style: preserve-3d;
  box-shadow: 0 12px 32px rgba(15, 23, 42, .08);
}
body.brain .br-chart svg { width: 100%; height: auto; display: block; }
body.brain .br-region { cursor: pointer; transition: opacity .25s var(--br-ease); }
body.brain .br-region .br-path {
  transition: filter .25s var(--br-ease), transform .25s var(--br-ease);
  transform-box: fill-box;
  transform-origin: center;
}
body.brain .br-region:hover .br-path,
body.brain .br-region.is-on .br-path {
  filter: brightness(1.08) drop-shadow(0 4px 8px rgba(13, 148, 136, .35));
}
body.brain .br-label {
  fill: #0f172a;
  font-family: var(--br-font-display);
  font-weight: 600;
  pointer-events: none;
  opacity: .82;
}
body.brain .br-readout {
  position: absolute;
  left: 1rem; bottom: 1rem;
  min-height: 1.25rem;
  font-size: .85rem;
  color: #134e4a;
  background: rgba(255, 255, 255, .82);
  backdrop-filter: blur(6px);
  padding: .35rem .65rem;
  border-radius: 999px;
  border: 1px solid rgba(13, 148, 136, .2);
  opacity: 0;
  transition: opacity .2s;
  pointer-events: none;
}
body.brain .br-readout.is-on { opacity: 1; }

body.brain .br-meters { display: grid; gap: .55rem; margin-top: 1rem; }
body.brain .br-meter { display: grid; grid-template-columns: 7.5rem 1fr 2rem; gap: .5rem; align-items: center; }
body.brain .br-ml { font-size: .85rem; color: var(--muted, #64748b); }
body.brain .br-mv { text-align: right; font-variant-numeric: tabular-nums; font-weight: 600; }

body.brain .br-region-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 1.5rem;
}
@media (max-width: 860px) {
  body.brain .br-region-grid { grid-template-columns: 1fr; }
}

body.brain .br-fn { margin: 0; padding-left: 1.1rem; }
body.brain .br-fn li { margin: .35rem 0; }

body.brain .br-atlas-peek {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}
@media (max-width: 720px) {
  body.brain .br-atlas-peek { grid-template-columns: 1fr; }
}
body.brain .br-chart-cap { margin: .5rem 0 0; text-align: center; }

body.brain .br-vs-charts {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.25rem;
}
@media (max-width: 720px) {
  body.brain .br-vs-charts { grid-template-columns: 1fr; }
}
body.brain .br-vs-x { color: var(--muted, #64748b); font-weight: 500; }
body.brain .br-vs-row {
  display: grid;
  grid-template-columns: 8rem 1fr;
  gap: .75rem;
  align-items: center;
  margin: .55rem 0;
}
body.brain .br-vs-bars {
  display: grid;
  gap: .35rem;
}
body.brain .br-vs-a,
body.brain .br-vs-b {
  display: block;
  height: 1.15rem;
  line-height: 1.15rem;
  font-size: .75rem;
  color: #fff;
  padding: 0 .4rem;
  border-radius: 6px;
  width: var(--w, 40%);
  max-width: 100%;
  font-variant-numeric: tabular-nums;
}
body.brain .br-vs-a { background: #0d9488; }
body.brain .br-vs-b { background: #475569; }

body.brain .br-field-head {
  display: flex;
  gap: .85rem;
  align-items: flex-start;
  margin-bottom: .85rem;
}
body.brain .br-field-emoji { font-size: 1.75rem; }

body.brain .br-card {
  transform-style: preserve-3d;
}
body.brain .br-credits { line-height: 1.7; }

@media (prefers-reduced-motion: reduce) {
  body.brain .br-stage,
  body.brain .br-region .br-path,
  body.brain .br-card {
    transition: none !important;
    transform: none !important;
  }
}