/* ===== Fonts ===== */
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-Light.woff2") format("woff2"); font-weight: 300; font-style: normal; font-display: swap; }
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-LightItalic.woff2") format("woff2"); font-weight: 300; font-style: italic; font-display: swap; }
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-Regular.woff2") format("woff2"); font-weight: 400; font-style: normal; font-display: swap; }
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-RegularItalic.woff2") format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-Bold.woff2") format("woff2"); font-weight: 700; font-style: normal; font-display: swap; }
@font-face { font-family: "Nantes"; src: url("../assets/fonts/Nantes-BoldItalic.woff2") format("woff2"); font-weight: 700; font-style: italic; font-display: swap; }

/* ===== Design tokens ===== */
:root {
  --c-black: #0a0a0a;
  --c-dark: #141414;
  --c-paper: #f5f3ef;
  --c-paper-dim: #eae7e0;
  --c-line: #dcd8cf;
  --c-muted: #7a766c;

  /* Provisional collection accents — placeholders per brandbook p.24, refine with real swatches */
  --c-accent-1: #6b3f4d; /* muted burgundy */
  --c-accent-2: #3f4d43; /* deep emerald */
  --c-accent-3: #8a7345; /* muted gold */

  /* Semantic surface tokens — remapped per theme below */
  --bg: var(--c-paper);
  --bg-elevated: #ffffff;
  --bg-dim: var(--c-paper-dim);
  --border: var(--c-line);
  --text: var(--c-dark);
  --text-muted: var(--c-muted);
  --text-body: #4a4740;
  --shadow-soft: 0 20px 60px rgba(20,20,20,.08);
  --do-color: #35472e;
  --dont-color: #6b3f4d;
  --invert-btn-text: #ffffff;

  --font-display: "Nantes", serif;
  --font-body: "Bricolage Grotesque", system-ui, sans-serif;

  --grid-margin-desktop: 80px;
  --grid-gutter-desktop: 24px;
  --grid-margin-mobile: 20px;
  --grid-gutter-mobile: 16px;

  --sidebar-w: 288px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

:root[data-theme="dark"] {
  --bg: #121115;
  --bg-elevated: #1b1a1f;
  --bg-dim: #232227;
  --border: #34323a;
  --text: #f2efe9;
  --text-muted: #948e85;
  --text-body: #d8d3ca;
  --shadow-soft: 0 20px 60px rgba(0,0,0,.5);
  --do-color: #8fb37d;
  --dont-color: #d99aa8;
  --invert-btn-text: #121115;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background .3s var(--ease), color .3s var(--ease);
}

h1, h2, h3, .display { font-family: var(--font-display); font-weight: 300; letter-spacing: -0.01em; margin: 0; }
a { color: inherit; text-decoration: none; }
code { font-family: 'SF Mono', 'Consolas', monospace; }

.tag { font-family: var(--font-body); text-transform: uppercase; letter-spacing: 0.14em; font-size: 11px; color: var(--text-muted); }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ===== Layout shell ===== */
.shell { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid var(--border);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.sidebar-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.brand-mark { display: block; width: 132px; flex-shrink: 0; }
.brand-mark svg { width: 100%; display: block; fill: var(--text); }

.icon-btn {
  width: 36px; height: 36px; flex-shrink: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg-elevated);
  color: var(--text);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: border-color .2s var(--ease), transform .15s var(--ease);
}
.icon-btn:hover { border-color: var(--text-muted); }
.icon-btn:active { transform: scale(0.92); }
.icon-btn svg { width: 16px; height: 16px; }
.icon-btn .moon { display: none; }
:root[data-theme="dark"] .icon-btn .sun { display: none; }
:root[data-theme="dark"] .icon-btn .moon { display: block; }

.search-trigger {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: var(--bg-elevated);
  color: var(--text-muted);
  font-size: 13px;
  cursor: pointer;
  width: 100%;
  font-family: var(--font-body);
  transition: border-color .2s var(--ease);
}
.search-trigger:hover { border-color: var(--text-muted); }
.search-trigger svg { width: 15px; height: 15px; flex-shrink: 0; }
.search-trigger kbd {
  margin-left: auto;
  font-family: var(--font-body);
  font-size: 11px;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 6px;
  color: var(--text-muted);
}

nav.toc { display: flex; flex-direction: column; gap: 2px; flex: 1; position: relative; }
nav.toc .group { margin-top: 16px; }
nav.toc .group-label { display: block; margin-bottom: 6px; color: var(--text-muted); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; }
nav.toc a {
  display: block; position: relative; z-index: 1;
  padding: 6px 10px; margin: 0 -10px;
  border-radius: 6px; font-size: 13.5px;
  color: var(--text); opacity: 0.55;
  transition: opacity .2s var(--ease);
}
nav.toc a:hover { opacity: 1; }
nav.toc a.active { opacity: 1; font-weight: 500; }
.toc-pill {
  position: absolute; left: -10px; width: calc(100% + 20px);
  height: 28px; background: var(--bg-dim); border-radius: 6px;
  z-index: 0; opacity: 0; pointer-events: none;
}

.sidebar-foot { font-size: 11.5px; color: var(--text-muted); border-top: 1px solid var(--border); padding-top: 14px; }

/* ===== Content ===== */
main.content { padding: 0; }

section.block {
  padding: 100px var(--grid-margin-desktop) 100px;
  max-width: 1240px;
  border-bottom: 1px solid var(--border);
  scroll-margin-top: 20px;
  position: relative;
}
section.block:last-of-type { border-bottom: none; }

.grain {
  position: absolute; inset: 0; pointer-events: none;
  opacity: .035; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

section.hero {
  min-height: 92vh;
  display: flex; flex-direction: column; justify-content: center; gap: 24px;
  padding-top: 60px; padding-bottom: 60px;
  overflow: hidden;
}
section.hero h1 { font-size: clamp(48px, 8vw, 108px); line-height: 0.98; }
section.hero p.lead { max-width: 620px; font-size: 19px; color: var(--text-muted); font-weight: 300; }
.hero-stats { display: flex; gap: 40px; margin-top: 20px; flex-wrap: wrap; }
.hero-stats .stat .n { font-family: var(--font-display); font-size: 34px; display: block; }
.hero-stats .stat .l { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .08em; }

.eyebrow { display: flex; align-items: center; gap: 12px; margin-bottom: 22px; }
.eyebrow .num { font-family: var(--font-display); font-style: italic; color: var(--text-muted); }

h2.block-title { font-size: clamp(32px, 4vw, 52px); margin-bottom: 8px; }
p.block-dek { max-width: 700px; color: var(--text-muted); font-size: 17px; margin-top: 14px; margin-bottom: 44px; }

h3.sub-title { font-size: 22px; margin: 48px 0 18px; display: flex; align-items: center; gap: 10px; }
h3.sub-title .tag { position: relative; top: 1px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--grid-gutter-desktop); }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: var(--grid-gutter-desktop); }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--grid-gutter-desktop); }

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 26px;
  transition: border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}
.card:hover { border-color: var(--text-muted); }
.card h3 { font-size: 20px; margin-bottom: 10px; }
.card p { font-size: 14.5px; color: var(--text-body); margin: 0; }
.card .idx { font-family: var(--font-display); font-style: italic; color: var(--text-muted); font-size: 14px; }

.pair-list { display: flex; flex-direction: column; gap: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg-elevated); }
.pair-row { display: grid; grid-template-columns: 1fr 1fr; border-bottom: 1px solid var(--border); }
.pair-row:last-child { border-bottom: none; }
.pair-cell { padding: 16px 22px; font-size: 14.5px; display: flex; align-items: center; gap: 8px; }
.pair-cell.do { color: var(--do-color); }
.pair-cell.dont { color: var(--dont-color); }
.pair-cell .ico { flex-shrink: 0; width: 15px; height: 15px; }
.pair-head { display: grid; grid-template-columns: 1fr 1fr; background: var(--bg-dim); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); }
.pair-head div { padding: 12px 22px; }

/* ===== Colour swatches ===== */
.swatches { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: 16px; }
.swatch {
  border: 1px solid var(--border); border-radius: 12px; overflow: hidden;
  background: var(--bg-elevated); cursor: pointer; position: relative;
  transition: border-color .2s var(--ease);
}
.swatch:hover { border-color: var(--text-muted); }
.swatch .fill { height: 100px; position: relative; overflow: hidden; }
.swatch .fill::after {
  content: ''; position: absolute; inset: 0; opacity: .12; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
.swatch .copy-hint {
  position: absolute; top: 8px; right: 8px; font-size: 10px; letter-spacing: .06em; text-transform: uppercase;
  background: rgba(0,0,0,.35); color: #fff; padding: 4px 8px; border-radius: 999px; opacity: 0;
  transition: opacity .15s var(--ease);
}
.swatch:hover .copy-hint { opacity: 1; }
.swatch .meta { padding: 12px 14px; }
.swatch .meta .name { font-size: 13px; font-weight: 500; }
.swatch .meta .hex { font-size: 12px; color: var(--text-muted); font-family: monospace; }
.swatch .shades {
  display: grid; grid-template-columns: repeat(8, 1fr);
  max-height: 0; overflow: hidden; transition: max-height .35s var(--ease);
}
.swatch.expanded .shades { max-height: 40px; }
.swatch .shades div { height: 40px; cursor: pointer; }

.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg); padding: 10px 20px; border-radius: 999px;
  font-size: 13px; opacity: 0; pointer-events: none; z-index: 200;
  transition: opacity .25s var(--ease), transform .25s var(--ease);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

.type-sample { border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elevated); padding: 30px; margin-bottom: 16px; }
.type-sample .label { font-size: 11px; letter-spacing: .12em; text-transform: uppercase; color: var(--text-muted); margin-bottom: 14px; }
.type-scale-table { width: 100%; border-collapse: collapse; margin-top: 8px; }
.type-scale-table th, .type-scale-table td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--border); font-size: 13.5px; }
.type-scale-table th { color: var(--text-muted); font-size: 11px; text-transform: uppercase; letter-spacing: .1em; font-weight: 500; }
.type-scale-table td.sample { font-family: var(--font-display); }

.grid-visual { display: grid; gap: 4px; border: 1px solid var(--border); border-radius: 10px; padding: 20px; background: var(--bg-elevated); }
.grid-visual .col { background: var(--bg-dim); min-height: 140px; border-radius: 3px; transition: background .2s var(--ease); }
.grid-demo-controls { display: flex; gap: 8px; margin-bottom: 18px; }
.seg-btn {
  border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text-muted);
  border-radius: 999px; padding: 8px 18px; font-size: 13px; cursor: pointer; font-family: var(--font-body);
  transition: all .2s var(--ease);
}
.seg-btn.active { background: var(--text); color: var(--bg); border-color: var(--text); }

.dl-card { display: flex; align-items: center; justify-content: space-between; gap: 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elevated); padding: 18px 22px; margin-bottom: 12px; }
.dl-card .info .name { font-weight: 500; font-size: 15px; }
.dl-card .info .meta { font-size: 12.5px; color: var(--text-muted); }
.dl-btn {
  border: 1px solid var(--text); border-radius: 999px; padding: 9px 20px; font-size: 13px; white-space: nowrap;
  transition: background .2s var(--ease), color .2s var(--ease); cursor: pointer; background: none; font-family: var(--font-body);
}
.dl-btn:hover { background: var(--text); color: var(--invert-btn-text); }

.steps { display: flex; flex-direction: column; gap: 0; }
.step { display: grid; grid-template-columns: 60px 1fr; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--border); }
.step:last-child { border-bottom: none; }
.step .n { font-family: var(--font-display); font-style: italic; font-size: 22px; color: var(--text-muted); }
.step h4 { font-size: 17px; margin-bottom: 6px; }
.step p { font-size: 14.5px; color: var(--text-body); margin: 0; max-width: 640px; }

.mono-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.mono-list li { padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg-elevated); font-size: 14.5px; display: flex; gap: 12px; align-items: baseline; }
.mono-list li .k { font-family: var(--font-display); font-style: italic; color: var(--text-muted); font-size: 13px; min-width: 26px; }

.principle-strip { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.principle-strip span { border: 1px solid var(--border); border-radius: 999px; padding: 8px 16px; font-size: 13px; background: var(--bg-elevated); }

/* ===== Checklists ===== */
.checklist { list-style: none; margin: 0; padding: 0; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; background: var(--bg-elevated); }
.checklist li { border-bottom: 1px solid var(--border); }
.checklist li:last-child { border-bottom: none; }
.checklist label { display: flex; align-items: center; gap: 12px; padding: 13px 18px; cursor: pointer; font-size: 14.5px; }
.checklist input[type="checkbox"] {
  width: 18px; height: 18px; flex-shrink: 0; margin: 0; accent-color: var(--text); cursor: pointer;
}
.checklist input:checked ~ span { text-decoration: line-through; color: var(--text-muted); }
.checklist-progress { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.checklist-progress .bar { flex: 1; height: 6px; border-radius: 999px; background: var(--bg-dim); overflow: hidden; }
.checklist-progress .bar .fill { height: 100%; background: var(--text); width: 0%; transition: width .3s var(--ease); }
.checklist-progress .label { font-size: 12px; color: var(--text-muted); white-space: nowrap; font-family: monospace; }

/* ===== Accordions ===== */
.accordion { border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elevated); overflow: hidden; margin-bottom: 10px; }
.accordion-head {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 16px 20px; cursor: pointer; font-size: 15px; font-weight: 500; background: none; border: none;
  width: 100%; text-align: left; color: var(--text); font-family: var(--font-body);
}
.accordion-head .chev { transition: transform .3s var(--ease); flex-shrink: 0; }
.accordion.open .accordion-head .chev { transform: rotate(180deg); }
.accordion-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .35s var(--ease); }
.accordion.open .accordion-body { grid-template-rows: 1fr; }
.accordion-body > div { overflow: hidden; }
.accordion-body .inner { padding: 0 20px 20px; font-size: 14.5px; color: var(--text-body); }

/* ===== Gallery / Lightbox ===== */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.gallery-item {
  aspect-ratio: 4/5; border-radius: 10px; position: relative; cursor: pointer; overflow: hidden;
  border: 1px solid var(--border); display: flex; align-items: flex-end; padding: 14px;
  transition: transform .25s var(--ease);
}
.gallery-item:hover { transform: translateY(-4px); }
.gallery-item .g-idx { font-family: var(--font-display); font-style: italic; color: rgba(255,255,255,.85); font-size: 13px; position: absolute; top: 14px; left: 14px; }
.gallery-item .g-label { color: #fff; font-size: 14px; font-weight: 500; position: relative; z-index: 1; }
.gallery-item::before { content: ''; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,.55)); }

.lightbox {
  position: fixed; inset: 0; background: rgba(10,10,10,.9); z-index: 300;
  display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none;
  transition: opacity .25s var(--ease);
}
.lightbox.show { opacity: 1; pointer-events: auto; }
.lightbox-stage { width: min(420px, 80vw); aspect-ratio: 4/5; border-radius: 14px; position: relative; display: flex; align-items: flex-end; padding: 26px; }
.lightbox-stage .g-label { color: #fff; font-size: 20px; font-family: var(--font-display); }
.lightbox-close, .lightbox-prev, .lightbox-next {
  position: absolute; background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.2); color: #fff;
  border-radius: 50%; width: 42px; height: 42px; display: flex; align-items: center; justify-content: center; cursor: pointer;
}
.lightbox-close { top: 24px; right: 24px; }
.lightbox-prev { left: 24px; top: 50%; transform: translateY(-50%); }
.lightbox-next { right: 24px; top: 50%; transform: translateY(-50%); }

/* ===== Search / command palette ===== */
.cmdk-overlay { position: fixed; inset: 0; background: rgba(10,10,10,.5); z-index: 400; display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh; opacity: 0; pointer-events: none; transition: opacity .2s var(--ease); }
.cmdk-overlay.show { opacity: 1; pointer-events: auto; }
.cmdk-panel { width: min(560px, 88vw); background: var(--bg-elevated); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow-soft); overflow: hidden; transform: translateY(-10px); transition: transform .2s var(--ease); }
.cmdk-overlay.show .cmdk-panel { transform: translateY(0); }
.cmdk-input-row { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.cmdk-input-row svg { width: 17px; height: 17px; color: var(--text-muted); flex-shrink: 0; }
.cmdk-input-row input { flex: 1; border: none; background: none; outline: none; font-size: 16px; color: var(--text); font-family: var(--font-body); }
.cmdk-input-row kbd { font-size: 11px; border: 1px solid var(--border); border-radius: 5px; padding: 2px 6px; color: var(--text-muted); }
.cmdk-results { max-height: 360px; overflow-y: auto; padding: 8px; }
.cmdk-item { display: flex; align-items: baseline; gap: 10px; padding: 11px 14px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.cmdk-item.active, .cmdk-item:hover { background: var(--bg-dim); }
.cmdk-item .grp { font-size: 11px; color: var(--text-muted); text-transform: uppercase; letter-spacing: .06em; margin-left: auto; flex-shrink: 0; }
.cmdk-empty { padding: 30px; text-align: center; color: var(--text-muted); font-size: 13.5px; }
.pulse-target { animation: pulseTarget 1.4s var(--ease); }
@keyframes pulseTarget {
  0% { box-shadow: 0 0 0 0 rgba(120,110,90,.35); }
  100% { box-shadow: 0 0 0 24px rgba(120,110,90,0); }
}

/* ===== Naming generator ===== */
.gen-form { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
.gen-form input {
  border: 1px solid var(--border); background: var(--bg-elevated); color: var(--text); border-radius: 8px;
  padding: 11px 13px; font-size: 13.5px; font-family: var(--font-body); outline: none; width: 100%;
  transition: border-color .2s var(--ease);
}
.gen-form input:focus { border-color: var(--text-muted); }
.gen-output { display: flex; align-items: center; justify-content: space-between; gap: 12px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg-dim); padding: 16px 20px; }
.gen-output code { font-size: 14.5px; word-break: break-all; }

/* ===== Motion demo ===== */
.motion-demo { border: 1px solid var(--border); border-radius: 10px; background: var(--bg-elevated); padding: 26px; }
.motion-track { position: relative; height: 6px; border-radius: 999px; background: var(--bg-dim); margin: 30px 0 20px; }
.motion-dot { position: absolute; top: 50%; left: 0; width: 16px; height: 16px; border-radius: 50%; background: var(--text); transform: translate(0,-50%); }

/* mockup wireframes */
.wireframe { border: 1px solid var(--border); border-radius: 10px; padding: 20px; background: var(--bg-elevated); }
.wireframe .wf-label { font-size: 11px; text-transform: uppercase; letter-spacing: .1em; color: var(--text-muted); margin-bottom: 12px; }
.wf-bad .wf-img { height: 60px; background: repeating-linear-gradient(45deg, var(--bg-dim), var(--bg-dim) 6px, transparent 6px, transparent 12px); border-radius: 6px; margin-bottom: 8px; }
.wf-bad .wf-line { height: 8px; background: var(--bg-dim); border-radius: 4px; margin-bottom: 6px; width: 90%; }
.wf-good .wf-img { height: 100px; background: var(--bg-dim); border-radius: 6px; margin-bottom: 14px; }
.wf-good .wf-line { height: 8px; background: var(--bg-dim); border-radius: 4px; margin-bottom: 8px; width: 50%; }
.wf-good .wf-line.sm { width: 30%; height: 6px; }

.mobile-toggle {
  display: none; position: fixed; top: 18px; right: 18px; z-index: 50;
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--bg-elevated); color: var(--text); align-items: center; justify-content: center;
}

/* ===== Responsive ===== */
@media (max-width: 980px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; inset: 0 20% 0 0; height: 100vh; width: auto;
    transform: translateX(-100%); transition: transform .3s var(--ease);
    background: var(--bg); z-index: 40;
  }
  .sidebar.open { transform: translateX(0); box-shadow: 20px 0 60px rgba(0,0,0,.2); }
  .mobile-toggle { display: flex; }
  section.block { padding: 60px var(--grid-margin-mobile) 60px; }
  .grid-2, .grid-3, .grid-4, .gen-form { grid-template-columns: 1fr; }
  .pair-row, .pair-head { grid-template-columns: 1fr; }
  .pair-cell.do { border-bottom: 1px solid var(--border); }
  section.hero { min-height: auto; padding-top: 100px; }
  .cmdk-overlay { padding-top: 8vh; }
}