:root {
  --red: #da251c;
  --ink: #111111;
  --muted: #62666b;
  --line: #e5e5e1;
  --paper: #f5f4f1;
  --surface: #f4f4f2;
  --header-height: 72px;
  --sidebar-width: 240px;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  color: var(--ink);
  background: #fff;
  font-synthesis: none;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; font-size: 16px; line-height: 1.7; -webkit-font-smoothing: antialiased; }
body.nav-open { overflow: hidden; }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { cursor: pointer; }
button:disabled { cursor: default; }
button, a { touch-action: manipulation; }
button:focus-visible, a:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--red); outline-offset: 5px; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
p, h1, h2, h3, figure { margin: 0; }
p { overflow-wrap: anywhere; }
h1, h2, h3 { line-height: 1.35; text-wrap: balance; }
h2 { font-size: clamp(30px, 2.5vw, 38px); font-weight: 650; letter-spacing: -.035em; }
h3 { font-size: 17px; font-weight: 650; }
code { font-family: "SFMono-Regular", Consolas, monospace; font-size: .9em; }
::selection { background: #f9d2cf; color: #111; }
[hidden] { display: none !important; }
.skip-link { position: fixed; z-index: 100; left: 16px; top: 12px; padding: 10px 18px; background: var(--ink); color: white; transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }

/* The book is a reading surface: one white canvas, one persistent red accent. */
.site-header { position: sticky; top: 0; z-index: 30; height: var(--header-height); display: flex; align-items: center; gap: 32px; padding: 0 32px; background: rgba(255,255,255,.97); border-bottom: 1px solid var(--line); }
.brand { flex: 0 0 auto; width: 146px; }
.brand img { width: 100%; height: auto; }
.chapter-nav { display: flex; align-items: center; justify-content: center; gap: clamp(20px, 3vw, 44px); flex: 1; font-size: 14px; white-space: nowrap; }
.chapter-nav a { padding: 23px 0; color: var(--muted); transition: color .16s ease; }
.chapter-nav a:hover, .chapter-nav a.is-active { color: var(--red); }
.download-pdf, .menu-toggle { flex: 0 0 auto; white-space: nowrap; font-size: 13px; font-weight: 600; }
.download-pdf { padding: 9px 15px; border: 1px solid var(--line); border-radius: 4px; }
.download-pdf span { margin-left: 12px; color: var(--red); }
.download-pdf:hover { border-color: var(--red); }
.menu-toggle { display: none; border: 0; background: none; padding: 8px 0 8px 12px; color: var(--ink); }
.sidebar { position: fixed; z-index: 20; left: 0; top: var(--header-height); bottom: 0; width: var(--sidebar-width); display: flex; flex-direction: column; border-right: 1px solid var(--line); background: #fff; }
.sidebar-title { padding: 27px 24px 20px; display: flex; flex-direction: column; gap: 4px; }
.sidebar-title > a { font-size: 19px; font-weight: 650; letter-spacing: -.025em; }
.sidebar-title > span { font-size: 11px; color: var(--muted); }
.toc { overflow-y: auto; min-height: 0; padding: 0 14px 26px; scrollbar-width: thin; scrollbar-color: #d7d7d2 transparent; }
.toc-group { padding: 0 0 14px; }
.toc-group summary { list-style: none; cursor: pointer; display: flex; justify-content: space-between; padding: 10px; font-size: 12px; font-weight: 650; color: var(--muted); }
.toc-group summary::-webkit-details-marker { display: none; }
.toc-group summary span { color: #989b9f; font-size: 10px; font-weight: 400; }
.toc-group summary::after { content: "+"; margin-left: 9px; color: #989b9f; font-size: 13px; font-weight: 400; }
.toc-group summary > span { margin-left: auto; }
.toc-group[open] summary::after { content: "−"; }
.toc-group a { display: flex; align-items: baseline; gap: 10px; padding: 7px 10px; font-size: 12px; line-height: 1.55; border-radius: 4px; color: #55595e; }
.toc-page { flex: 0 0 15px; color: #a1a3a5; font-size: 10px; font-variant-numeric: tabular-nums; }
.toc-group a:hover { background: var(--surface); color: var(--ink); }
.toc-group a.is-active, .toc-group a[aria-current="location"], .toc-group a[aria-current="true"] { background: #fff0ee; color: var(--red); }
.toc-group a.is-active .toc-page, .toc-group a[aria-current] .toc-page { color: var(--red); }
.sidebar-footer { flex: 0 0 auto; display: flex; flex-direction: column; padding: 17px 24px; border-top: 1px solid var(--line); font-size: 9px; color: #8b8f93; line-height: 1.7; letter-spacing: .06em; }
.sidebar-footer span:first-child { color: var(--red); font-weight: 600; }
main { margin-left: var(--sidebar-width); min-width: 0; }
.mobile-scrim { display: none; }

/* A title-only cover, using the approved red diagonal language. */
.cover { display: grid; grid-template-columns: 62% 38%; min-height: 560px; height: min(740px, calc(100dvh - 112px)); max-width: 1116px; margin: 32px auto 20px; width: calc(100% - 64px); background: var(--paper); overflow: hidden; scroll-margin-top: 104px; }
.cover-copy { padding: clamp(40px, 4vw, 64px); display: flex; align-items: flex-start; flex-direction: column; }
.cover-brand { color: var(--red); font-family: Arial, sans-serif; font-size: 12px; letter-spacing: .05em; font-weight: 700; }
.cover-brand::before { content: ""; display: block; width: 36px; height: 4px; margin-bottom: 20px; background: var(--red); }
.cover h1 { margin-top: clamp(66px, 8vw, 120px); font-size: clamp(52px, 4.7vw, 76px); line-height: 1.35; letter-spacing: -.045em; font-weight: 650; white-space: nowrap; }
.cover-en { color: var(--muted); font-family: Arial, sans-serif; font-weight: 400; font-size: 13px; letter-spacing: .12em; margin-top: 23px; }
.start-reading { display: flex; align-items: center; gap: 40px; font-size: 13px; margin-top: auto; padding-top: 32px; }
.start-reading span { font-size: 19px; color: var(--red); transition: transform .2s ease; }
.start-reading:hover span { transform: translate(3px, -3px); }
.cover-art { isolation: isolate; position: relative; display: flex; align-items: center; justify-content: center; background: var(--red); overflow: hidden; }
.cover-art::before, .cover-art::after { content: ""; position: absolute; z-index: -1; left: -35%; width: 170%; height: 22%; transform: skewY(-27deg); }
.cover-art::before { top: 18%; background: #e3372d; }
.cover-art::after { bottom: 9%; background: #cb2119; }
.code-mark { color: #f6b1ac; font-family: Arial, sans-serif; font-weight: 200; font-size: clamp(90px, 12vw, 190px); line-height: 1; letter-spacing: -.07em; transform: scaleX(.82); }

.manual-content { max-width: 1180px; margin: 0 auto; padding: 0 clamp(32px, 4.5vw, 64px); }
.manual-section { padding: 76px 0 80px; border-bottom: 1px solid var(--line); scroll-margin-top: 100px; }
.manual-section.chapter-start { padding-top: 96px; }
.manual-section:last-child { border-bottom: 0; }
.section-header { margin-bottom: 32px; }
.section-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 22px; }
.source-link { flex: 0 0 auto; font-size: 10px; white-space: nowrap; color: #62666b; }
.source-link:hover { color: var(--red); }
.lede { max-width: 760px; margin-top: 16px; font-size: 15px; line-height: 1.8; color: var(--muted); }
.brand-film-section { padding-top: 64px; }
.film-duration { color: var(--muted); font-size: 13px; font-variant-numeric: tabular-nums; letter-spacing: .06em; white-space: nowrap; }
.brand-video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; background: #faf9f6; border: 1px solid var(--line); }
.brand-video:focus-visible { outline: 2px solid var(--red); outline-offset: 4px; }
.film-caption { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 18px 24px; margin-top: 20px; }
.film-caption p { display: flex; flex-wrap: wrap; gap: 8px 22px; color: var(--muted); font-size: 12px; font-variant-numeric: tabular-nums; }
.film-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; font-size: 12px; }
.film-actions > a { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); }
.film-actions > a:hover, .film-error a { color: var(--red); }
.film-error { margin-top: 14px; font-size: 13px; color: var(--muted); }
@media (max-width: 640px) {
  .film-caption { align-items: flex-start; gap: 12px; }
  .film-caption p { width: 100%; font-size: 11px; gap: 6px 16px; }
  .film-actions { gap: 16px; }
}
@media print { .film-actions, .brand-video, .film-error { display: none !important; } }
.asset-preview { appearance: none; position: relative; display: flex; width: 100%; align-items: center; justify-content: center; border: 0; border-radius: 0; padding: 0; color: inherit; background: var(--surface); overflow: hidden; text-align: left; }
.asset-preview img { width: 100%; height: 100%; object-fit: contain; transition: transform .25s ease; }
.asset-preview:hover img { transform: scale(1.025); }
.asset-preview:active img { transform: scale(1.01); }
.preview-hint { pointer-events: none; position: absolute; bottom: 12px; right: 14px; font-size: 10px; color: var(--muted); background: rgba(255,255,255,.88); padding: 3px 7px; opacity: 0; transition: opacity .2s ease; border-radius: 4px; }
.asset-preview:hover .preview-hint, .asset-preview:focus-visible .preview-hint { opacity: 1; }
.form-stage { height: clamp(240px, 24vw, 340px); padding: clamp(40px, 5vw, 76px); margin-bottom: 33px; }
.form-1 { padding: 20px; }
.form-1 img { max-width: 450px; }
.form-2 img, .form-3 img { max-width: 740px; }
.form-4 { padding: 38px; }
.form-4 img { max-width: 480px; }
.explanation-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 34px; }
.explanation-grid h3, .two-column-copy h3, .rule-grid h3, .vertical-copy h3 { margin-bottom: 11px; }
.explanation-grid p, .two-column-copy p, .rule-grid p, .vertical-copy p { color: var(--muted); font-size: 14px; line-height: 1.85; }
.two-column-copy { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 42px; margin-top: 36px; }
.rule-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 42px; margin-top: 36px; }
.vertical-copy { display: grid; gap: 28px; }
.note { margin-top: 32px; padding: 18px 22px; background: #fafaf8; border-left: 2px solid #d4d5ce; }
.note p { font-size: 12px; line-height: 1.85; color: #73777b; }
.note strong { display: block; margin-bottom: 7px; font-size: 12px; font-weight: 600; color: var(--ink); }
.subheading { margin: 34px 0 18px; font-size: 19px; }
.asset-caption { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; padding-top: 17px; }
.asset-caption h3 { font-size: 15px; }
.asset-caption p { margin-top: 5px; color: var(--muted); font-size: 12px; line-height: 1.7; }
.asset-caption > div { min-width: 0; }
.text-link { flex: 0 0 auto; white-space: nowrap; font-family: Arial, sans-serif; font-size: 10px; color: #72767a; }
.text-link:hover { color: var(--red); }
.logo-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px 26px; }
.logo-card .asset-preview { aspect-ratio: 2.5; padding: 26px 32px; }
.icon-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 30px 20px; }
.icon-card .asset-preview { aspect-ratio: 1.3; padding: 7px; }
.icon-card .asset-caption { align-items: flex-start; }
.icon-card .asset-caption p { font-size: 11px; }
.color-overview-grid figure { min-width: 0; }
.color-overview-stage { aspect-ratio: 1.35; padding: 8px; }
.color-overview-label { margin-top: 14px; font-size: 14px; font-weight: 550; line-height: 1.6; }
@media (max-width: 640px) {
  .color-overview-label { font-size: 12px; }
}

/* Each color is a complete reading stop with both approved logo forms. */
.anchor-alias { display: block; height: 0; scroll-margin-top: 100px; }
.colorway-sources { display: flex; gap: 12px; flex: 0 0 auto; }
.colorway-pair { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.6fr); gap: 26px; }
.colorway-stage { height: 270px; padding: 32px; }
.colorway-icon img { max-width: 280px; }
.colorway-combination img { max-width: 650px; }
.colorway-pair figcaption { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-top: 16px; }
.colorway-pair figcaption h3 { font-size: 15px; }
.colorway-section .two-column-copy { grid-template-columns: minmax(0, .9fr) minmax(0, 1.6fr); gap: 26px; }
.toc-colorway { font-weight: 400; }
@media (max-width: 640px) {
  .colorway-pair, .colorway-section .two-column-copy { grid-template-columns: 1fr; gap: 28px; }
  .colorway-stage { height: 220px; padding: 28px; }
  .colorway-icon { padding: 10px 35px; }
  .colorway-icon img { max-width: 250px; }
  .colorway-combination { height: 190px; padding: 26px; }
  .colorway-pair figcaption h3 { font-size: 14px; }
  .colorway-sources { gap: 8px; }
}

.swatch-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px 20px; }
.swatch { display: flex; flex-direction: column; justify-content: space-between; align-items: flex-start; width: 100%; height: 170px; padding: 23px; border: 0; border-radius: 0; color: var(--swatch-text); background: var(--swatch); text-align: left; }
.swatch > span:first-child { font-size: 14px; font-weight: 500; }
.swatch strong { font: 500 23px/1.3 Arial, sans-serif; letter-spacing: -.02em; }
.copy-label { font-size: 10px; opacity: 1; }
.swatch:hover .copy-label { opacity: 1; }
.color-tones { margin-top: 11px; display: flex; flex-direction: column; gap: 4px; font-size: 10px; color: var(--muted); font-family: Arial, sans-serif; }
.color-tones span { display: flex; gap: 8px; align-items: center; }
.color-tones i { display: inline-block; width: 10px; height: 10px; }
.fixed-wordmark-colors { display: flex; align-items: center; gap: 20px; padding: 23px; margin-top: 35px; background: var(--surface); }
.fixed-wordmark-colors h3 { font-size: 14px; margin-right: auto; }
.fixed-wordmark-colors button { display: flex; align-items: center; gap: 10px; border: 0; padding: 0; background: none; font-size: 12px; color: var(--muted); }
.fixed-wordmark-colors i { width: 21px; height: 21px; flex: 0 0 auto; }
.fixed-wordmark-colors code { font-size: 10px; }

.space-demo { display: grid; grid-template-columns: 1.8fr 1fr; gap: 22px; }
.clear-space, .space-symbol { background: var(--surface); padding: 38px; display: flex; align-items: center; flex-direction: column; justify-content: center; min-height: 250px; }
.clear-space-box { position: relative; width: 100%; padding: 23px 22px; border: 1px dashed var(--red); }
.clear-space-box img { width: 100%; }
.measure { position: absolute; top: -17px; left: -6px; padding: 0 7px; color: var(--red); background: var(--surface); font-size: 11px; }
.clear-space p, .space-symbol p { color: var(--muted); font-size: 11px; margin-top: 20px; text-align: center; }
.space-symbol { padding: 18px; }
.space-symbol img { width: 160px; height: 130px; object-fit: contain; }
.table-scroll { width: 100%; overflow-x: auto; scrollbar-width: thin; border-bottom: 1px solid var(--line); }
table { border-collapse: collapse; width: 100%; min-width: 620px; text-align: left; font-size: 12px; line-height: 1.7; }
th { background: #171717; color: white; font-weight: 500; font-size: 11px; padding: 13px 18px; white-space: nowrap; }
td { padding: 16px 18px; vertical-align: top; }
tbody tr:nth-child(odd) { background: #f6f6f4; }
td:first-child { font-weight: 500; width: 28%; }
.background-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.background-sample { display: flex; align-items: center; padding: 20px; aspect-ratio: 1.8; border: 1px solid var(--line); }
.sample-white { background: #fff; }
.sample-cream { background: #fff0e2; }
.sample-dark { background: #27282a; }
.sample-dark img { background: white; padding: 11px; }
.background-grid figcaption { margin-top: 12px; font-size: 12px; color: var(--muted); }

.ip-introduction { display: grid; grid-template-columns: .9fr 1.1fr; gap: 46px; align-items: center; }
.ip-feature .asset-preview { background: #fff0e2; }
.ip-feature img { aspect-ratio: 1; }
.ip-palette { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; margin-top: 32px; }
.ip-palette button { display: flex; align-items: center; gap: 12px; padding: 0; border: 0; background: none; text-align: left; font-size: 12px; color: var(--ink); }
.ip-palette i { width: 30px; height: 30px; border: 1px solid #e1dfd8; flex: 0 0 auto; }
.ip-palette code { display: block; color: var(--muted); font-size: 10px; }
.view-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 20px; }
.view-grid .asset-preview { aspect-ratio: .72; }
.view-grid .asset-preview img { object-fit: contain; }
.view-grid h3 { margin-top: 21px; font-size: 14px; }
.view-grid p { font-size: 12px; color: var(--muted); line-height: 1.8; margin-top: 10px; }
.flat-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.flat-grid .asset-preview { aspect-ratio: .8; padding: 14px; }
.flat-grid > article > p { margin-top: 12px; font-size: 12px; color: var(--muted); }
.flat-grid .asset-spec { color: var(--red); font-size: 10px; }

.avatar-feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; margin-bottom: 34px; }
.avatar-feature-grid > article { background: var(--surface); padding: 24px; }
.avatar-feature-grid h3 { font-size: 16px; margin-top: 20px; }
.avatar-feature-grid > article > p { margin-top: 8px; color: var(--muted); font-size: 12px; }
.avatar-comparison { display: grid; grid-template-columns: 1.3fr 1fr; gap: 25px; align-items: center; }
.avatar-comparison .asset-preview { aspect-ratio: 1; }
.avatar-comparison > .circle { width: 100%; }
.circle { border-radius: 50%; aspect-ratio: 1; object-fit: contain; }
.avatar-toolbar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.avatar-toolbar > span { color: var(--muted); font-size: 12px; }
.segmented { display: inline-flex; padding: 3px; border: 1px solid var(--line); border-radius: 4px; }
.segmented button { border: 0; border-radius: 2px; background: white; color: var(--muted); font-size: 11px; padding: 7px 15px; }
.segmented button.is-selected, .segmented button[aria-pressed="true"] { background: var(--ink); color: white; }
.avatar-grid { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 30px 20px; }
.avatar-stage { aspect-ratio: 1; padding: 13px; }
.avatar-stage img { transition: border-radius .2s ease, transform .25s ease; }
.avatar-grid.is-circular .avatar-stage img { border-radius: 50%; }
.avatar-tile .asset-caption { gap: 4px; }
.avatar-tile .asset-caption h3 { font-size: 11px; }
.avatar-tile .text-link { font-size: 9px; }
.avatar-tile > p { color: var(--muted); font-size: 10px; line-height: 1.8; margin-top: 7px; }
.dark-avatar-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px; }
.dark-avatar-grid .avatar-stage { padding: 24px; }
.dark-avatar-grid .asset-caption h3 { font-size: 13px; }
.dark-avatar-grid > article > p { color: var(--muted); font-size: 12px; margin-top: 12px; }
.crop-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 42px; }
.crop-main { background: var(--surface); padding: 26px; }
.crop-guide { position: relative; }
.crop-guide::after { content: ""; position: absolute; inset: 0; border: 1px dashed var(--red); border-radius: 50%; }
.crop-main figcaption { margin-top: 24px; font-size: 14px; line-height: 1.8; }
.crop-main figcaption span { font-size: 12px; color: var(--muted); }
.crop-details { min-width: 0; }
.size-comparison { display: grid; gap: 22px; margin-bottom: 35px; }
.size-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.size-row > span { width: 34px; flex: 0 0 auto; color: var(--muted); font-size: 10px; }
.size-row img { flex: 0 1 auto; min-width: 0; }
.size-96 { width: 18%; max-width: 96px; }
.size-64 { width: 15%; max-width: 64px; }
.size-32 { width: 32px; }
.crop-details .vertical-copy { gap: 22px; }
.crop-details .vertical-copy h3 { font-size: 15px; }
.crop-details .vertical-copy p { font-size: 12px; }
.account-list { overflow: hidden; }
#heading-20 > span { display: inline-block; }
.account-row { display: grid; grid-template-columns: 1.3fr 1fr 1.15fr; gap: 25px; align-items: center; padding: 23px 24px; background: #dde6ee; }
.account-row:nth-child(even) { background: #e8eef3; }
.account-identity h3 { font-size: 14px; line-height: 1.6; }
.account-identity p { margin-top: 6px; font-size: 11px; line-height: 1.8; color: var(--muted); }
.account-avatar { display: flex; align-items: center; gap: 12px; min-width: 0; }
.account-avatar > img { width: 48px; height: 48px; flex: 0 0 48px; }
.account-avatar > div { min-width: 0; }
.account-avatar strong { display: block; font-size: 12px; line-height: 1.6; font-weight: 550; }
.account-avatar span { display: block; font-size: 10px; color: var(--muted); margin-top: 5px; }
.account-reason { font-size: 11px; color: var(--muted); line-height: 1.85; }

.composition-stage { display: grid; grid-template-columns: 1.7fr 1fr; gap: 30px; background: var(--surface); padding: 30px 42px; margin-bottom: 34px; align-items: center; }
.composition-stage > div img { width: 100%; }
.composition-stage > div p { font-size: 12px; color: var(--muted); margin-top: 27px; }
.composition-stage > img { width: 100%; }
.expression-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.expression-item { padding: 22px 18px 0; display: flex; flex-direction: column; background: var(--surface); }
.expression-item > img:first-child { width: 100%; height: 50px; object-fit: contain; }
.expression-item h3 { font-size: 19px; margin-top: 33px; }
.expression-item .expression-ip { aspect-ratio: .8; width: 100%; object-fit: contain; margin-top: 5px; }
.expression-item p { margin: 16px -18px 0; background: white; padding-top: 16px; font-size: 11px; color: var(--muted); }
.expression-1 { background: #edf3ff; }
.expression-2 { background: #e7efea; }
.expression-3 { background: #fff6eb; }
.mockup-stage { padding: 20px; margin-bottom: 34px; }
.mockup-stage img { width: 100%; height: auto; object-fit: contain; }
.site-footer { max-width: 1180px; margin: 0 auto; padding: 34px clamp(32px, 4.5vw, 64px); display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--line); }
.site-footer > div { display: flex; flex-direction: column; gap: 3px; }
.site-footer strong { font-size: 13px; font-weight: 550; }
.site-footer span { font-size: 10px; color: var(--muted); }
.site-footer > a { font-size: 11px; color: var(--muted); }
.site-footer > a:hover { color: var(--red); }

dialog { width: min(1000px, calc(100% - 64px)); max-height: calc(100dvh - 64px); padding: 0; border: 0; border-radius: 4px; color: var(--ink); overflow: auto; overscroll-behavior: contain; background: white; }
dialog::backdrop { background: rgba(17,17,17,.63); }
.dialog-top { padding: 22px 28px; display: flex; justify-content: space-between; align-items: center; gap: 24px; border-bottom: 1px solid var(--line); }
.dialog-top h2 { font-size: 19px; }
.dialog-close { border: 0; padding: 3px; color: var(--muted); background: none; font-size: 12px; white-space: nowrap; }
.dialog-close:hover { color: var(--red); }
.dialog-image-wrap { min-height: 220px; max-height: 65dvh; padding: 42px; background: var(--surface); display: flex; align-items: center; justify-content: center; }
.dialog-image-wrap img { max-width: 100%; max-height: 56dvh; object-fit: contain; width: auto; height: auto; }
.dialog-bottom { padding: 22px 28px; display: flex; align-items: center; gap: 24px; justify-content: space-between; }
.dialog-bottom p { font-size: 12px; color: var(--muted); }
.download-asset { background: var(--red); color: white; padding: 9px 17px; font-size: 12px; border-radius: 4px; flex: 0 0 auto; }
.toast { position: fixed; z-index: 90; bottom: 24px; left: calc(50% + 120px); transform: translate(-50%, 18px); opacity: 0; pointer-events: none; padding: 12px 20px; background: var(--ink); color: #fff; border-radius: 4px; font-size: 12px; transition: opacity .2s ease, transform .2s ease; }
.toast.is-visible, .toast.show { opacity: 1; transform: translate(-50%, 0); }
.noscript-note { margin-left: var(--sidebar-width); padding: 20px 32px; font-size: 13px; color: var(--muted); background: var(--surface); }

@media (min-width: 1600px) {
  .site-header { padding-left: 40px; padding-right: 40px; }
  .brand { width: 154px; }
}
@media (max-width: 1200px) and (min-width: 901px) {
  .site-header { padding: 0 24px; gap: 26px; }
  .chapter-nav { gap: 24px; font-size: 12px; }
  .brand { width: 132px; }
  .manual-content { padding: 0 32px; }
  .cover { width: calc(100% - 48px); margin-top: 24px; }
  .cover-copy { padding: 38px; }
  .cover h1 { font-size: 52px; }
  .cover-en { font-size: 11px; }
  .explanation-grid { gap: 24px; }
  .explanation-grid h3 { font-size: 15px; }
  .explanation-grid p { font-size: 13px; }
  .view-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px 20px; }
  .flat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flat-grid .asset-preview { aspect-ratio: 1; }
  .avatar-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .icon-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .icon-card .asset-preview { aspect-ratio: 1.7; }
  .fixed-wordmark-colors { flex-wrap: wrap; }
  .fixed-wordmark-colors h3 { width: 100%; }
  .ip-introduction { gap: 26px; }
  .vertical-copy { gap: 20px; }
  .vertical-copy h3 { font-size: 15px; }
  .vertical-copy p { font-size: 12px; }
  .avatar-feature-grid > article { padding: 18px; }
  .avatar-comparison { gap: 15px; }
  .avatar-feature-grid h3 { font-size: 13px; }
  .dark-avatar-grid { gap: 18px; }
  .dark-avatar-grid .avatar-stage { padding: 16px; }
  .crop-layout { grid-template-columns: .8fr 1.2fr; gap: 26px; }
  .crop-main { padding: 20px; }
  .account-row { grid-template-columns: 1.3fr 1fr; gap: 13px 24px; padding: 20px; }
  .account-reason { grid-column: 1 / -1; }
  .expression-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 26px 20px; }
  .expression-item .expression-ip { aspect-ratio: 1; }
}
@media (max-width: 900px) {
  :root { --header-height: 64px; }
  .site-header { padding: 0 22px; gap: 18px; }
  .brand { width: 128px; margin-right: auto; }
  .chapter-nav { display: none; }
  .download-pdf { font-size: 11px; padding: 7px 10px; }
  .download-pdf span { margin-left: 8px; }
  .menu-toggle { display: block; font-size: 12px; }
  .sidebar { width: min(320px, calc(100vw - 50px)); transform: translateX(-101%); transition: transform .22s ease; z-index: 50; }
  .sidebar-title { padding: 25px 25px 20px; }
  .toc { padding: 0 15px 24px; }
  .toc-group summary { font-size: 13px; }
  .toc-group a { font-size: 13px; padding: 9px 10px; }
  .mobile-scrim { position: fixed; inset: var(--header-height) 0 0; z-index: 40; background: rgba(17,17,17,.35); }
  .nav-open .sidebar { transform: translateX(0); }
  .nav-open .mobile-scrim { display: block; }
  main { margin-left: 0; }
  .cover { max-width: none; width: calc(100% - 48px); height: min(680px, calc(100dvh - 112px)); min-height: 520px; margin-top: 24px; }
  .cover h1 { font-size: clamp(50px, 7vw, 64px); margin-top: 75px; }
  .manual-content { padding: 0 32px; }
  .manual-section { padding: 60px 0 64px; }
  .manual-section.chapter-start { padding-top: 76px; }
  .section-header { margin-bottom: 28px; }
  h2 { font-size: 30px; }
  .explanation-grid { gap: 26px; }
  .explanation-grid p { font-size: 13px; }
  .ip-introduction { gap: 30px; }
  .vertical-copy { gap: 20px; }
  .vertical-copy h3 { font-size: 15px; }
  .vertical-copy p { font-size: 13px; }
  .view-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 26px 20px; }
  .flat-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .flat-grid .asset-preview { aspect-ratio: 1; }
  .avatar-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .account-row { grid-template-columns: 1.3fr 1fr; gap: 13px 24px; }
  .account-reason { grid-column: 1 / -1; }
  .expression-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 22px; }
  .expression-item .expression-ip { aspect-ratio: 1; }
  .toast { left: 50%; }
  .noscript-note { margin-left: 0; }
}
@media (max-width: 640px) {
  html { scroll-padding-top: 86px; }
  body { font-size: 15px; }
  .site-header { gap: 10px; padding: 0 18px; }
  .brand { width: 116px; }
  .download-pdf { font-size: 10px; padding: 6px 9px; }
  .menu-toggle { font-size: 11px; padding-left: 7px; }
  .cover { width: calc(100% - 36px); grid-template-columns: 1fr; min-height: 0; height: auto; margin-top: 18px; }
  .cover-copy { min-height: 440px; padding: 31px; }
  .cover-brand { font-size: 10px; }
  .cover-brand::before { width: 28px; height: 3px; margin-bottom: 14px; }
  .cover h1 { font-size: clamp(44px, 11.8vw, 62px); line-height: 1.3; margin-top: 58px; }
  .cover-en { margin-top: 20px; font-size: 10px; }
  .start-reading { font-size: 12px; padding-top: 30px; }
  .cover-art { height: 130px; }
  .cover-art::before { top: -10%; height: 65%; left: -12%; }
  .cover-art::after { bottom: -75%; height: 110%; }
  .code-mark { font-size: 112px; }
  .manual-content { padding: 0 24px; }
  .manual-section { padding: 48px 0 52px; scroll-margin-top: 88px; }
  .manual-section.chapter-start { padding-top: 62px; }
  .section-heading { gap: 15px; align-items: flex-start; }
  h2 { font-size: 26px; line-height: 1.5; }
  .source-link { margin-top: 8px; font-size: 9px; }
  .lede { font-size: 14px; line-height: 1.85; margin-top: 15px; }
  .form-stage { height: 220px; padding: 26px; margin-bottom: 28px; }
  .form-1 { padding: 8px 38px; }
  .form-4 { padding: 30px 42px; }
  .explanation-grid, .two-column-copy, .rule-grid { grid-template-columns: 1fr; gap: 25px; }
  .explanation-grid h3, .two-column-copy h3, .rule-grid h3 { font-size: 16px; margin-bottom: 8px; }
  .explanation-grid p, .two-column-copy p, .rule-grid p { font-size: 14px; }
  .note { padding: 17px 18px; margin-top: 28px; }
  .note p { font-size: 12px; }
  .logo-grid { grid-template-columns: 1fr; gap: 27px; }
  .logo-card .asset-preview { padding: 29px 30px; aspect-ratio: 2.8; }
  .asset-caption { padding-top: 13px; }
  .asset-caption h3 { font-size: 14px; }
  .icon-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 25px 16px; }
  .icon-card .asset-preview { aspect-ratio: 1.35; padding: 0; }
  .icon-card .asset-caption { gap: 5px; }
  .icon-card .asset-caption h3 { font-size: 13px; }
  .icon-card .asset-caption p { font-size: 10px; }
  .text-link { font-size: 9px; }
  .swatch-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px 15px; }
  .swatch { height: 145px; padding: 19px; }
  .swatch > span:first-child { font-size: 12px; }
  .swatch strong { font-size: 20px; }
  .copy-label { font-size: 9px; }
  .color-tones { font-size: 9px; }
  .fixed-wordmark-colors { flex-direction: column; align-items: flex-start; gap: 15px; padding: 20px; }
  .fixed-wordmark-colors h3 { font-size: 14px; }
  .fixed-wordmark-colors button { font-size: 12px; }
  .space-demo { grid-template-columns: 1fr; gap: 15px; }
  .clear-space { padding: 32px 30px; min-height: 195px; }
  .clear-space-box { padding: 23px 18px; }
  .space-symbol { min-height: 190px; padding: 20px; }
  .space-symbol img { width: 150px; height: 115px; }
  .space-symbol p { margin-top: 4px; }
  .subheading { font-size: 18px; }
  table { min-width: 590px; font-size: 11px; }
  td { padding: 14px 15px; }
  th { padding: 12px 15px; }
  .background-grid { grid-template-columns: 1fr; gap: 24px; }
  .background-sample { padding: 30px; aspect-ratio: 2.8; }
  .background-grid figcaption { margin-top: 9px; }
  .ip-introduction { grid-template-columns: 1fr; gap: 30px; }
  .ip-feature .asset-preview { max-height: 380px; }
  .ip-feature img { max-height: 380px; }
  .vertical-copy h3 { font-size: 16px; margin-bottom: 8px; }
  .vertical-copy p { font-size: 14px; }
  .ip-palette { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 23px 20px; }
  .view-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px 17px; }
  .view-grid .asset-preview { aspect-ratio: .8; }
  .view-grid h3 { margin-top: 16px; font-size: 13px; }
  .view-grid p { font-size: 12px; }
  .flat-grid { gap: 28px 17px; }
  .flat-grid .asset-preview { padding: 8px; aspect-ratio: .9; }
  .flat-grid .asset-caption h3 { font-size: 13px; }
  .flat-grid > article > p { font-size: 12px; }
  .flat-grid .asset-spec { font-size: 10px; }
  .avatar-feature-grid { grid-template-columns: 1fr; gap: 20px; }
  .avatar-feature-grid > article { padding: 23px; }
  .avatar-feature-grid h3 { font-size: 15px; }
  .avatar-comparison { grid-template-columns: 1.2fr 1fr; gap: 25px; }
  .avatar-toolbar { gap: 13px; margin-bottom: 21px; }
  .avatar-toolbar > span { font-size: 11px; }
  .segmented button { padding: 6px 10px; font-size: 10px; }
  .avatar-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 27px 16px; }
  .avatar-stage { padding: 13px; }
  .avatar-tile .asset-caption h3 { font-size: 10px; }
  .avatar-tile .text-link { font-size: 8px; }
  .avatar-tile > p { font-size: 10px; }
  .dark-avatar-grid { grid-template-columns: 1fr; gap: 28px; }
  .dark-avatar-grid .avatar-stage { padding: 25px; max-height: 340px; }
  .dark-avatar-grid .asset-caption h3 { font-size: 14px; }
  .dark-avatar-grid > article > p { font-size: 13px; }
  .crop-layout { grid-template-columns: 1fr; gap: 31px; }
  .crop-main { max-width: 380px; padding: 26px; }
  .size-comparison { gap: 24px; }
  .size-row { gap: 12px; }
  .size-row > span { width: 29px; }
  .size-96 { width: 18%; }
  .size-64 { width: 15%; }
  .size-32 { width: 32px; }
  .crop-details .vertical-copy h3 { font-size: 15px; }
  .crop-details .vertical-copy p { font-size: 13px; }
  .account-row { grid-template-columns: 1fr; gap: 15px; padding: 24px 21px; }
  .account-identity h3 { font-size: 15px; }
  .account-identity p { font-size: 12px; margin-top: 5px; }
  .account-avatar { gap: 14px; }
  .account-avatar > img { width: 50px; height: 50px; flex-basis: 50px; }
  .account-avatar strong { font-size: 13px; }
  .account-avatar span { font-size: 11px; }
  .account-reason { grid-column: auto; font-size: 12px; }
  .composition-stage { grid-template-columns: 1.2fr 1fr; padding: 22px; gap: 17px; }
  .composition-stage > div p { font-size: 9px; margin-top: 15px; }
  .expression-grid { gap: 25px 16px; }
  .expression-item { padding: 18px 14px 0; }
  .expression-item > img:first-child { height: 30px; }
  .expression-item h3 { font-size: 17px; margin-top: 27px; }
  .expression-item .expression-ip { aspect-ratio: .8; margin-top: 10px; }
  .expression-item p { margin: 13px -14px 0; font-size: 10px; line-height: 1.75; }
  .mockup-stage { padding: 8px; margin-bottom: 27px; }
  .site-footer { padding: 27px 24px; }
  .site-footer strong { font-size: 12px; }
  .site-footer span { font-size: 9px; }
  dialog { width: calc(100% - 28px); max-height: calc(100dvh - 28px); }
  .dialog-top { padding: 18px 20px; gap: 16px; }
  .dialog-top h2 { font-size: 16px; }
  .dialog-close { font-size: 11px; }
  .dialog-image-wrap { padding: 25px; min-height: 200px; max-height: 65dvh; }
  .dialog-image-wrap img { max-height: 56dvh; }
  .dialog-bottom { padding: 18px 20px; gap: 17px; }
  .dialog-bottom p { font-size: 11px; }
  .download-asset { font-size: 11px; padding: 8px 12px; }
  .toast { font-size: 11px; width: max-content; max-width: calc(100% - 36px); bottom: 20px; }
}
@media (max-width: 360px) {
  .manual-content { padding: 0 19px; }
  .site-header { padding: 0 15px; }
  .brand { width: 105px; }
  .download-pdf { padding: 5px 7px; }
  .cover { width: calc(100% - 30px); }
  .cover-copy { padding: 28px; }
  .cover h1 { font-size: 42px; }
  .section-heading { flex-direction: column; gap: 7px; }
  .source-link { margin-top: 0; }
  .swatch { padding: 16px; }
  .swatch strong { font-size: 18px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}
@media print {
  .site-header, .sidebar, .mobile-scrim, .preview-hint, .avatar-toolbar, .text-link, .source-link, .site-footer, .start-reading, .toast, dialog { display: none !important; }
  main { margin-left: 0; }
  .cover { width: 100%; height: 80vh; margin: 0; break-after: page; }
  .manual-content { padding: 0; }
  .manual-section { padding-top: 28px; break-inside: avoid; }
  .asset-preview { background: #f4f4f2 !important; }
  .table-scroll { overflow: visible; }
  table { min-width: 0; }
}

/* The brand comparison is the final reading section, separate from the film. */
.film-actions .comparison-link { gap: 14px; padding: 9px 15px; border: 1px solid var(--red); border-radius: 4px; color: var(--red); }
.film-actions .comparison-link:hover { background: #fff0ee; }
.comparison-eyebrow { margin-bottom: 16px; font-size: 11px; letter-spacing: .12em; font-weight: 600; color: var(--red); }
.comparison-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.comparison-version { min-width: 0; padding: 28px 24px 24px; border: 1px solid var(--line); border-top: 3px solid #b5b5b0; background: #fff; }
.comparison-after { border-top-color: var(--red); }
.comparison-version-heading { display: flex; align-items: baseline; gap: 14px; margin-bottom: 28px; }
.comparison-version-heading h3 { font-size: 25px; }
.comparison-version-heading span { font-size: 11px; letter-spacing: .1em; color: var(--muted); }
.comparison-after .comparison-version-heading h3, .comparison-after .comparison-version-heading span { color: var(--red); }
.comparison-item + .comparison-item { border-top: 1px solid var(--line); margin-top: 16px; padding-top: 24px; }
.comparison-label { font-size: 12px; color: var(--muted); }
.comparison-logo-stage { height: clamp(120px, 14vw, 170px); display: flex; align-items: center; justify-content: center; }
.comparison-art { position: relative; overflow: hidden; flex: 0 0 auto; }
.comparison-art img { position: absolute; max-width: none; height: auto; }
.comparison-art-logo { width: 100%; max-width: 400px; }
.comparison-before .comparison-art-logo { width: 70%; }
.comparison-ip-stage { --ip-height: clamp(220px, 24vw, 300px); display: flex; justify-content: center; align-items: center; padding: 26px 0 0; }
.comparison-art-ip { height: var(--ip-height); width: calc(var(--ip-height) * var(--art-ratio)); }
@media (max-width: 640px) {
  .comparison-grid { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  .comparison-version { padding: 24px 22px; }
  .comparison-version-heading { margin-bottom: 22px; }
  .comparison-logo-stage { height: 138px; }
  .comparison-ip-stage { --ip-height: 260px; }
}
@media print {
  .comparison-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .comparison-version { break-inside: avoid; }
  .comparison-ip-stage { --ip-height: 220px; }
}