:root {
  --rail: 212px;
  --max: 1440px;
  --page: #071512;
  --paper: #0e2621;
  --paper-alt: #17332d;
  --ink: #fffcf5;
  --muted: #aebdb7;
  --line: rgba(174, 189, 183, .2);
  --primary: #ddbd62;
  --primary-soft: #f0d992;
  --deep: #315149;
  --accent: #51c7a9;
  --danger: #ef8068;
  --warm: #f3f0e7;
  --warm-surface: #fffcf5;
  --warm-ink: #172923;
  --warm-muted: #556861;
  --on-primary: #13231f;
  --shadow: rgba(0, 0, 0, .28);
  --radius: 8px;
}

body[data-direction="atlas"] {
  --page: #081d1a;
  --paper: #102a24;
  --paper-alt: #123934;
  --ink: #f2fff9;
  --muted: #a9c9c1;
  --line: rgba(112, 212, 187, .22);
  --primary: #70d4bb;
  --primary-soft: #c4f4e8;
  --deep: #285e55;
  --accent: #ddbd62;
  --danger: #ef8068;
  --on-primary: #08201c;
}

body[data-direction="ledger"] {
  --page: #f3f0e7;
  --paper: #fffcf5;
  --paper-alt: #eae5d8;
  --ink: #172923;
  --muted: #556861;
  --line: rgba(49, 81, 73, .24);
  --primary: #806018;
  --primary-soft: #ddbd62;
  --deep: #315149;
  --accent: #267660;
  --danger: #9d594a;
  --on-primary: #fffcf5;
  --shadow: rgba(23, 41, 35, .12);
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Inter, "IBM Plex Sans", "Noto Sans TC", "Noto Sans JP", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  transition: background-color .35s ease, color .35s ease;
}

img, svg {
  display: block;
  max-width: 100%;
}

a { color: inherit; }
button { font: inherit; }
::selection { background: var(--primary); color: var(--on-primary); }

.skip-link {
  position: fixed;
  z-index: 1000;
  top: 12px;
  left: 12px;
  padding: 12px 16px;
  background: var(--primary);
  color: var(--on-primary);
  transform: translateY(-150%);
  transition: transform .2s ease;
}

.skip-link:focus { transform: translateY(0); }
:focus-visible { outline: 3px solid var(--primary-soft); outline-offset: 4px; }

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 auto 0 0;
  width: var(--rail);
  display: flex;
  flex-direction: column;
  padding: 28px 24px 24px;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 94%, transparent);
  backdrop-filter: blur(18px);
}

.brand-home {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
  text-decoration: none;
}

.brand-home img { width: 62px; }
.brand-home span { display: grid; gap: 3px; }
.brand-home strong { font-size: 16px; line-height: 1; }

.brand-home small,
.rail-meta {
  color: var(--muted);
  font-size: 10px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.site-nav {
  display: grid;
  margin-top: 82px;
}

.site-nav a {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid transparent;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-decoration: none;
}

.site-nav a span {
  width: 24px;
  color: var(--primary);
  font-size: 10px;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--ink);
  border-color: var(--line);
}

.rail-meta {
  display: grid;
  gap: 5px;
  margin-top: auto;
}

.menu-toggle { display: none; }
.page-shell { margin-left: var(--rail); }

.direction-bar {
  position: sticky;
  z-index: 90;
  top: 0;
  display: flex;
  min-height: 70px;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--page) 91%, transparent);
  backdrop-filter: blur(18px);
}

.direction-bar > p {
  align-self: center;
  margin: 0;
  padding: 0 24px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.direction-switcher {
  display: flex;
  scrollbar-width: none;
}

.direction-switcher::-webkit-scrollbar {
  display: none;
}

.direction-switcher button {
  min-width: 168px;
  padding: 0 18px;
  border: 0;
  border-left: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 12px;
  font-weight: 800;
}

.direction-switcher button span {
  display: block;
  color: var(--primary);
  font-size: 10px;
  font-weight: 900;
}

.direction-switcher button[aria-selected="true"] {
  background: var(--primary);
  color: var(--on-primary);
}

.direction-switcher button[aria-selected="true"] span { color: var(--on-primary); }

.section-pad {
  width: min(100%, var(--max));
  margin: 0 auto;
  padding: 104px 56px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(370px, .82fr);
  gap: 64px;
  align-items: center;
  min-height: calc(100vh - 70px);
}

.hero-copy { max-width: 760px; }

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .16em;
  text-transform: uppercase;
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  margin-bottom: 24px;
  font-family: Georgia, "Noto Serif TC", serif;
  font-size: 76px;
  font-weight: 500;
  line-height: 1.04;
  letter-spacing: 0;
}

h1 em {
  display: block;
  color: var(--primary-soft);
  font-style: normal;
}

.hero-lede {
  max-width: 690px;
  color: var(--muted);
  font-size: 18px;
}

blockquote {
  margin: 26px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--primary);
  color: var(--primary-soft);
  font-family: Georgia, "Noto Serif TC", serif;
  font-size: 26px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  font-size: 14px;
  font-weight: 800;
  text-decoration: none;
}

.button-primary {
  border-color: var(--primary);
  background: var(--primary);
  color: var(--on-primary);
}

.button-quiet:hover,
.button-primary:hover {
  transform: translateY(-1px);
}

.brand-stage {
  position: relative;
  min-height: 520px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, color-mix(in srgb, var(--paper-alt) 72%, transparent), transparent), var(--paper);
  box-shadow: 0 34px 90px var(--shadow);
}

.stage-grid {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 42px 42px;
  opacity: .18;
}

.stage-label {
  position: absolute;
  z-index: 1;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.stage-label-top { top: 22px; left: 22px; }
.stage-label-side { right: -74px; top: 50%; transform: rotate(90deg); }

.stage-logo {
  position: absolute;
  z-index: 2;
  top: 108px;
  left: 50%;
  width: 252px;
  transform: translateX(-50%);
}

.stage-window {
  position: absolute;
  z-index: 2;
  left: 34px;
  right: 34px;
  bottom: 42px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--page) 72%, transparent);
}

.stage-window span {
  display: block;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.stage-window strong {
  display: block;
  margin-top: 4px;
  font-size: 22px;
}

.stage-signal {
  position: absolute;
  z-index: 1;
  inset: 190px 54px 138px;
}

.stage-signal .path {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 3px;
  background: var(--primary-soft);
  transform: rotate(-11deg);
}

.stage-signal .path::before,
.stage-signal .path::after {
  content: "";
  position: absolute;
  width: 42%;
  border-top: 3px solid var(--primary-soft);
  border-radius: 50%;
}

.stage-signal .path::before { left: 4%; top: 38px; transform: rotate(24deg); }
.stage-signal .path::after { right: 2%; top: -36px; transform: rotate(-24deg); }

.point {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 3px solid var(--paper);
}

.point.low { left: 17%; bottom: 18%; background: var(--danger); }
.point.high { right: 19%; top: 16%; background: var(--accent); }

.stage-coordinate {
  position: absolute;
  z-index: 2;
  right: 28px;
  bottom: 154px;
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
}

.stage-coordinate i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
}

.hero-facts {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 20px 0 0;
  border-block: 1px solid var(--line);
}

.hero-facts div {
  padding: 18px;
  border-right: 1px solid var(--line);
}

.hero-facts div:last-child { border-right: 0; }

dt {
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

dd {
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.ruled-section { border-top: 1px solid var(--line); }

.section-heading {
  display: grid;
  grid-template-columns: minmax(250px, .7fr) minmax(0, 1fr);
  gap: 64px;
  margin-bottom: 44px;
}

.section-heading.horizontal { grid-template-columns: .9fr 1.1fr; }
.section-heading.compact { display: block; margin: 0; }

.section-heading h2 {
  margin: 0;
  font-family: Georgia, "Noto Serif TC", serif;
  font-size: 52px;
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: 0;
}

.section-heading h2 small {
  display: block;
  margin-top: 10px;
  color: var(--primary);
  font-family: inherit;
  font-size: 18px;
}

.section-heading p:not(.section-kicker),
.concept-statement {
  max-width: 720px;
  color: var(--muted);
  font-size: 17px;
}

.source-comparison {
  display: grid;
  grid-template-columns: 1fr 150px 1fr;
  gap: 18px;
  align-items: center;
}

figure { margin: 0; }

.source-frame,
.specimen,
.color-roles article,
.type-specimens article,
.graphic-card,
.output-card,
.checklist,
.app-frame,
.voice-grid article,
.asset-list article,
.important-note,
.principles,
.clearspace-demo,
.minimum-scale,
.donts {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.source-frame {
  display: grid;
  place-items: center;
  min-height: 280px;
  padding: 24px;
}

.source-frame.original {
  background: var(--warm-surface);
  color: var(--warm-ink);
}

.source-frame.reconstructed { background: #071512; }

.source-frame img {
  width: min(260px, 78%);
  margin: 36px 0;
}

.figure-label,
.specimen span,
.rule-label,
.type-specimens span,
.graphic-card span,
.app-frame span,
.asset-list span,
.meta span {
  justify-self: start;
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.source-frame.original .figure-label { color: #806018; }

figcaption {
  color: var(--muted);
  font-size: 12px;
}

.source-frame.original figcaption { color: #556861; }

.source-arrow {
  display: grid;
  gap: 12px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-align: center;
  text-transform: uppercase;
}

.source-arrow b {
  display: block;
  height: 1px;
  background: var(--primary);
}

.source-arrow b::after {
  content: "";
  display: block;
  width: 9px;
  height: 9px;
  margin: -4px 0 0 auto;
  border-top: 1px solid var(--primary);
  border-right: 1px solid var(--primary);
  transform: rotate(45deg);
}

.register-grid,
.strategy-grid,
.color-roles,
.type-scale,
.layout-system,
.contrast-pairs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin-top: 20px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.register-grid div,
.strategy-grid article,
.type-scale div,
.layout-system div,
.contrast-pairs div {
  padding: 22px;
  background: var(--page);
}

.register-grid span,
.strategy-grid span,
.type-scale span,
.layout-system span,
.contrast-pairs span {
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.register-grid p,
.type-scale p,
.layout-system p,
.contrast-pairs p { margin: 12px 0 0; }

.register-grid strong,
.type-scale strong,
.layout-system strong,
.contrast-pairs strong {
  display: block;
  font-size: 16px;
}

.register-grid small,
.type-scale p,
.layout-system p,
.contrast-pairs p {
  display: block;
  color: var(--muted);
  font-size: 13px;
}

.concept-intro {
  display: grid;
  grid-template-columns: .7fr 1.3fr;
  gap: 64px;
  align-items: start;
  margin-bottom: 38px;
}

.strategy-grid article h3,
.color-roles article h3,
.graphic-card h3,
.app-frame h3,
.asset-list h3 {
  margin: 24px 0 8px;
  font-size: 20px;
}

.strategy-grid article p,
.color-roles article p,
.graphic-card p,
.app-frame p,
.asset-list p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.principles {
  margin-top: 28px;
  padding: 28px;
}

.principles ol {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin: 0;
  padding-left: 22px;
}

.principles li::marker {
  color: var(--primary);
  font-weight: 900;
}

.principles span {
  display: block;
  margin-bottom: 6px;
  font-weight: 900;
}

.principles p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.logo-specimens,
.type-specimens,
.graphic-grid,
.component-grid,
.application-grid,
.voice-grid,
.asset-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}

.specimen {
  display: grid;
  min-height: 240px;
  padding: 22px;
}

.specimen img {
  align-self: center;
  justify-self: center;
  width: 78%;
  max-height: 92px;
  object-fit: contain;
}

.specimen-primary,
.specimen-horizontal,
.specimen-small { background: #071512; }

.specimen-source {
  background: var(--warm-surface);
  color: var(--warm-ink);
}

.specimen-source span { color: #806018; }

.logo-rules {
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 18px;
  margin-top: 18px;
}

.clearspace-demo,
.minimum-scale,
.donts { padding: 24px; }

.clearspace-box {
  display: grid;
  grid-template-columns: 56px 1fr 56px;
  gap: 14px;
  align-items: center;
  margin: 24px 0 14px;
  padding: 24px;
  border: 1px dashed var(--primary);
}

.clearspace-box img {
  justify-self: center;
  width: 180px;
}

.clearspace-box i {
  color: var(--primary);
  font-style: normal;
  text-align: center;
}

.minimum-scale p,
.clearspace-demo p,
.donts p {
  color: var(--muted);
  font-size: 13px;
}

.scale-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin: 24px 0 14px;
  align-items: end;
}

.scale-row div {
  display: grid;
  gap: 12px;
  justify-items: center;
  color: var(--muted);
  font-size: 12px;
}

.scale-row div:nth-child(1) img { width: 180px; }
.scale-row div:nth-child(2) img { width: 120px; }
.scale-row div:nth-child(3) img { width: 96px; }

.donts {
  margin-top: 18px;
}

.donts ul {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.donts li {
  display: grid;
  gap: 10px;
}

.bad-logo {
  display: grid;
  place-items: center;
  min-height: 92px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #071512;
}

.bad-logo img { width: 110px; }
.bad-logo.stretch img { transform: scaleX(1.35); }
.bad-logo.rotate img { transform: rotate(-12deg); }
.bad-logo.glow img { filter: drop-shadow(0 0 12px var(--primary)); }
.bad-logo.clash { background: linear-gradient(90deg, #51c7a9, #ef8068); }
.donts p { margin: 0; }

.color-roles {
  grid-template-columns: repeat(4, 1fr);
  margin-bottom: 18px;
}

.color-roles article {
  padding: 22px;
  background: var(--paper);
}

.role-chip {
  color: var(--primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.swatch-grid {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 8px;
}

.swatch {
  min-height: 172px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: #fffcf5;
}

.swatch b,
.swatch span,
.swatch em { display: block; }
.swatch b { font-size: 14px; }
.swatch span { font-weight: 900; }

.swatch em {
  margin-top: 4px;
  font-size: 12px;
  font-style: normal;
  opacity: .82;
}

.swatch.ink { background: #071512; }
.swatch.panel { background: #0e2621; }
.swatch.line { background: #315149; }
.swatch.ivory { background: #f3f0e7; color: #172923; }
.swatch.surface { background: #fffcf5; color: #172923; }
.swatch.gold { background: #ddbd62; color: #13231f; }
.swatch.gold-paper { background: #806018; }
.swatch.high { background: #51c7a9; color: #06221c; }
.swatch.low { background: #ef8068; color: #2b0905; }

.contrast-pairs { grid-template-columns: repeat(3, 1fr); }

.type-specimens {
  grid-template-columns: 1.2fr 1fr 1fr;
}

.type-specimens article { padding: 26px; }

.type-display h3 {
  font-family: Georgia, "Noto Serif TC", serif;
  font-size: 44px;
  font-weight: 500;
  line-height: 1.08;
}

.type-interface h3 {
  font-size: 28px;
  line-height: 1.18;
}

.type-data h3 {
  font-size: 34px;
  font-variant-numeric: tabular-nums;
}

.type-specimens p { color: var(--muted); }
.type-scale, .layout-system { margin-top: 18px; }

.graphic-grid {
  grid-template-columns: repeat(3, 1fr);
}

.graphic-card {
  position: relative;
  min-height: 300px;
  overflow: hidden;
  padding: 24px;
}

.graphic-card i {
  position: absolute;
  inset: auto 24px 28px 24px;
  height: 110px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.graphic-card.timeline i::before {
  content: "";
  position: absolute;
  left: 24px;
  right: 24px;
  top: 54px;
  border-top: 3px solid var(--primary);
}

.graphic-card.timeline i::after {
  content: "LOW        HIGH";
  position: absolute;
  left: 38px;
  right: 38px;
  top: 32px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .12em;
}

.graphic-card.lattice i {
  background:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
}

.graphic-card.pulse i::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 54px;
  height: 54px;
  border: 2px solid var(--primary);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.graphic-card.pulse i::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--primary);
  transform: translate(-50%, -50%);
}

.component-grid { grid-template-columns: 1.1fr .9fr; }

.output-card,
.checklist,
.voice-grid article,
.app-frame,
.asset-list article { padding: 28px; }

.meta strong {
  display: block;
  margin-top: 5px;
  font-size: 22px;
}

.output-points {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 40px 0 18px;
}

.output {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--page) 82%, transparent);
}

.output span,
.output time,
.output b { display: block; }

.output span {
  font-size: 12px;
  font-weight: 900;
  letter-spacing: .12em;
}

.output time {
  margin: 18px 0 2px;
  font-size: 38px;
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.output.low { color: var(--danger); }
.output.high { color: var(--accent); }

.output-card p,
.checklist li { color: var(--muted); }

.checklist h3,
.voice-grid h3 { font-size: 24px; }

.checklist ul,
.voice-grid ul {
  margin: 18px 0 0;
  padding-left: 20px;
}

.application-grid {
  grid-template-columns: repeat(3, 1fr);
}

.app-frame {
  min-height: 280px;
}

.landing-preview { background: linear-gradient(180deg, #071512, #0e2621); }
.app-preview { background: linear-gradient(180deg, #102a24, #123934); }
.research-preview { background: #fffcf5; color: #172923; }
.research-preview p { color: #556861; }

.voice-grid {
  grid-template-columns: repeat(2, 1fr);
}

.asset-list {
  grid-template-columns: repeat(4, 1fr);
}

.asset-list a {
  display: inline-flex;
  margin-top: 18px;
  color: var(--primary-soft);
  font-weight: 900;
  text-decoration: none;
}

.important-note {
  margin-top: 18px;
  padding: 24px;
}

.important-note strong { color: var(--primary); }

.important-note p {
  margin: 8px 0 0;
  color: var(--muted);
}

.footer {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr) auto;
  gap: 20px;
  align-items: center;
  padding: 34px 56px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}

.footer img { width: 96px; }
.footer p { margin: 0; }
.footer a { color: var(--primary-soft); text-decoration: none; }

@media (max-width: 1120px) {
  :root { --rail: 0px; }

  .site-header {
    position: sticky;
    inset: auto;
    width: auto;
    min-height: 70px;
    flex-direction: row;
    align-items: center;
    padding: 0 22px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .brand-home img { width: 76px; }

  .site-nav {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    display: none;
    margin: 0;
    padding: 12px 22px 20px;
    background: var(--page);
    border-bottom: 1px solid var(--line);
  }

  .site-nav.open {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0 16px;
  }

  .menu-toggle {
    display: grid;
    gap: 5px;
    margin-left: auto;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: transparent;
    color: var(--ink);
    padding: 9px 12px;
    cursor: pointer;
  }

  .menu-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: currentColor;
  }

  .menu-toggle i {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
  }

  .rail-meta { display: none; }
  .page-shell { margin-left: 0; }
  .direction-bar { top: 70px; }

  .hero,
  .section-heading,
  .section-heading.horizontal,
  .concept-intro,
  .source-comparison,
  .logo-rules {
    grid-template-columns: 1fr;
  }

  .source-arrow { grid-template-columns: 1fr; }

  .source-arrow b::after {
    margin-left: auto;
    margin-right: auto;
    transform: rotate(135deg);
  }

  .hero-facts,
  .register-grid,
  .strategy-grid,
  .color-roles,
  .layout-system,
  .asset-list,
  .logo-specimens {
    grid-template-columns: repeat(2, 1fr);
  }

  .swatch-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 760px) {
  .direction-bar { display: block; }

  .direction-bar > p {
    padding: 12px 18px 4px;
  }

  .direction-switcher { overflow-x: auto; }

  .direction-switcher button {
    min-width: 156px;
    min-height: 52px;
  }

  .section-pad { padding: 72px 20px; }
  h1 { font-size: 44px; }
  blockquote { font-size: 22px; }
  .section-heading h2 { font-size: 36px; }

  .brand-stage { min-height: 430px; }
  .stage-logo { width: 190px; }
  .stage-label-side { display: none; }

  .hero-facts,
  .register-grid,
  .strategy-grid,
  .principles ol,
  .logo-specimens,
  .donts ul,
  .color-roles,
  .type-specimens,
  .type-scale,
  .graphic-grid,
  .layout-system,
  .component-grid,
  .application-grid,
  .voice-grid,
  .asset-list,
  .contrast-pairs,
  .footer {
    grid-template-columns: 1fr;
  }

  .hero-facts div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .hero-facts div:last-child { border-bottom: 0; }
  .swatch-grid { grid-template-columns: repeat(2, 1fr); }
  .output-points, .scale-row { grid-template-columns: 1fr; }
  .site-nav.open { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; }
}