/*
 * DIRECTION CONTRACT: Braun Instrument, carried from the app (brief-pinned; no seed roll).
 * THESIS: The site is the instrument's printed leaflet: one quiet white face, a real graduated scale, ruled
 *   readings with their source. Refuses the product-hero-plus-feature-cards page.
 * OWN-WORLD: Paper #fff, black ink, legend grey #4a4a4a, rule grey #9a9a9a (never text), one green lamp
 *   #1e7a46 that always sits beside words. Archivo, tabular figures. 2px engraved rules under titles,
 *   1.5px pill keys, a panel bezel around every screenshot, ordered-dither fills only on the access scale.
 * STORY: What it is, for which tablet, what is verified; then how each part works, each linked to its file.
 * FIRST VIEWPORT: Wordmark and keys left, the landscape home in its bezel right, the access scale below.
 * FORM: Braun AB1 / T1000 instruction-leaflet grammar; figures numbered, no motion.
 */

@font-face {
  font-family: "Archivo";
  src: url("fonts/archivo.woff2") format("woff2");
  font-weight: 400 800;
  font-stretch: 87% 100%;
  font-display: swap;
}

:root {
  --paper: #ffffff;
  --ink: #000000;
  --legend: #4a4a4a;
  --rule: #9a9a9a;
  --lamp: #1e7a46;
  --rim: 1.5px;
  --engraved: 2px;
  --margin: clamp(20px, 5vw, 72px);
  --max: 1240px;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 24px;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Archivo", "Helvetica Neue", Arial, sans-serif;
  font-size: 1.125rem;
  line-height: 1.6;
  font-variant-numeric: tabular-nums lining-nums;
  font-kerning: normal;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; }

a {
  color: var(--ink);
  text-decoration-line: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 3px;
  border-radius: 2px;
}

code, pre, kbd, .path { font-family: var(--mono); font-size: 0.86em; }
code { overflow-wrap: anywhere; }

p { margin: 0 0 1em; }
h1, h2, h3, h4 { margin: 0; font-weight: 650; text-wrap: balance; }

.skip {
  position: absolute;
  left: var(--margin);
  top: -60px;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  z-index: 10;
}
.skip:focus { top: 12px; }

.wrap {
  max-width: calc(var(--max) + 2 * var(--margin));
  margin: 0 auto;
  padding: 0 var(--margin);
}

/* Masthead ------------------------------------------------------------ */

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px 24px;
  flex-wrap: wrap;
  padding-top: 22px;
  padding-bottom: 22px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  text-decoration: none;
  min-height: 48px;
}
.brand img { width: 36px; height: 36px; image-rendering: pixelated; }

.nav {
  display: flex;
  align-items: center;
  gap: 4px 22px;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 1rem;
  font-weight: 550;
}
.nav a:not(.key) {
  text-decoration: none;
  display: inline-block;
  padding: 12px 0;
}
.nav a:not(.key):hover,
.nav a[aria-current="page"] { text-decoration: underline; text-decoration-thickness: 2px; }

/* Keys: the app's pill buttons --------------------------------------- */

.key {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 48px;
  padding: 0 24px;
  border: var(--rim) solid var(--ink);
  border-radius: 999px;
  background: var(--paper);
  color: var(--ink);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
}
.key:hover { background: var(--ink); color: var(--paper); }
.key.solid { background: var(--ink); color: var(--paper); }
.key.solid:hover { background: var(--paper); color: var(--ink); }
.key.small { min-height: 44px; padding: 0 18px; font-size: 0.9375rem; }

.keys { display: flex; flex-wrap: wrap; gap: 12px; }

/* The lamp ----------------------------------------------------------- */

.lamp {
  display: inline-block;
  width: 0.72em;
  height: 0.72em;
  border-radius: 50%;
  background: var(--lamp);
  box-shadow: 0 0 0 1.5px var(--ink);
  vertical-align: 0.02em;
  flex: none;
}
.lamp.off { background: var(--paper); }
.lamp.cell { border-radius: 0; box-shadow: none; }

/* Hero --------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 40px clamp(32px, 5vw, 80px);
  align-items: center;
  padding-top: clamp(24px, 5vw, 64px);
  padding-bottom: clamp(40px, 5vw, 64px);
}

.hero > :first-child { container-type: inline-size; }
.hero h1 {
  font-size: clamp(2.25rem, 1.2rem + 4.6vw, 5.25rem);
  font-size: min(5.5rem, 14.2cqi);
  line-height: 0.96;
  font-weight: 720;
  letter-spacing: -0.038em;
  margin-bottom: 0.32em;
}

.lead {
  font-size: clamp(1.25rem, 1rem + 0.75vw, 1.5625rem);
  line-height: 1.38;
  font-weight: 500;
  letter-spacing: -0.008em;
  max-width: 30ch;
  margin-bottom: 1.4em;
  text-wrap: pretty;
}

.status-line {
  display: flex;
  gap: 10px;
  align-items: baseline;
  margin-top: 28px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--legend);
  max-width: 42ch;
}
.status-line strong { color: var(--ink); font-weight: 600; }

/* Panels: a screenshot in the tablet's bezel -------------------------- */

figure { margin: 0; }

.panel {
  border: var(--rim) solid var(--ink);
  border-radius: 18px;
  padding: 10px;
  background: var(--paper);
}
.panel img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: 0 0 0 1px var(--rule);
}

figcaption {
  margin-top: 12px;
  font-size: 0.875rem;
  line-height: 1.45;
  color: var(--legend);
  max-width: 46ch;
}
figcaption b { color: var(--ink); font-weight: 650; margin-right: 0.35em; }

/* Engraved section titles -------------------------------------------- */

section { scroll-margin-top: 24px; }

.engraved {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  border-bottom: var(--engraved) solid var(--ink);
  margin-bottom: clamp(24px, 3vw, 36px);
}
.engraved h2 {
  font-size: clamp(1.75rem, 1.2rem + 1.6vw, 2.625rem);
  line-height: 1.08;
  letter-spacing: -0.024em;
}
.engraved .key { margin-bottom: 2px; }

.block { margin-top: clamp(72px, 9vw, 136px); }

/* The access scale --------------------------------------------------- */

.scale-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px 24px;
  margin-bottom: 18px;
}
.scale-head h2 {
  font-size: clamp(1.375rem, 1.1rem + 0.9vw, 1.875rem);
  letter-spacing: -0.018em;
  line-height: 1.15;
}
.scale-head p { margin: 0; color: var(--legend); font-size: 1rem; max-width: 52ch; }

.tiers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  position: relative;
}

/* minor ticks across the whole scale, like the app's tuning scale */
.tiers::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 12px;
  background: repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 100%) 0 0 / calc(100% / 40) 100%;
  border-right: 1px solid var(--rule);
}

.tier {
  position: relative;
  padding: 26px clamp(12px, 1.6vw, 24px) 0 0;
  border-left: var(--engraved) solid var(--ink);
  padding-left: clamp(12px, 1.6vw, 20px);
}
.tier:last-child { border-right: 0; }

.tier .band {
  height: 44px;
  margin: 0 0 18px;
  border: var(--rim) solid var(--ink);
  border-radius: 3px;
}
.t0 .band { background: conic-gradient(var(--ink) 0 25%, var(--paper) 0) 0 0 / 8px 8px; }
.t1 .band { background: repeating-conic-gradient(var(--ink) 0 25%, var(--paper) 0 50%) 0 0 / 8px 8px; }
.t2 .band { background: conic-gradient(var(--paper) 0 25%, var(--ink) 0) 0 0 / 8px 8px; }
.t3 .band { border-style: dashed; border-color: var(--legend); background: var(--paper); }

.tier h3 {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 1.125rem;
  line-height: 1.3;
  margin-bottom: 6px;
}
.tier h3 .id {
  font-stretch: 88%;
  font-weight: 750;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
}
.tier p { font-size: 0.9375rem; line-height: 1.5; color: var(--legend); margin: 0; }
.tier p strong { color: var(--ink); font-weight: 600; }
.t3 h3 { color: var(--legend); }

.lamp-note {
  display: flex;
  gap: 8px;
  align-items: baseline;
  margin-top: 10px !important;
  color: var(--ink) !important;
  font-weight: 600;
}

/* Why: the owner's words, and the readings plate ---------------------- */

.why {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 40px clamp(32px, 5vw, 88px);
  align-items: start;
}
.why .statement {
  font-size: clamp(1.25rem, 1rem + 0.8vw, 1.625rem);
  line-height: 1.45;
  font-weight: 500;
  letter-spacing: -0.008em;
  max-width: 38ch;
}
.why .statement p + p { margin-top: 0.9em; }

.readings {
  margin: 0;
  padding: 0;
  border-top: var(--engraved) solid var(--ink);
}
.readings div {
  display: grid;
  grid-template-columns: minmax(7.5em, 0.8fr) minmax(0, 1.6fr);
  gap: 4px 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 0.9375rem;
  line-height: 1.45;
}
.readings dt { color: var(--legend); font-weight: 500; }
.readings dd { margin: 0; font-weight: 600; }
.readings dd span { display: block; font-weight: 400; color: var(--legend); }

.principles {
  list-style: none;
  padding: 0;
  margin: 40px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0 clamp(20px, 3vw, 40px);
  grid-column: 1 / -1;
}
.principles li { border-top: 1px solid var(--ink); padding-top: 14px; }
.principles h3 { font-size: 1.125rem; margin-bottom: 6px; }
.principles p { font-size: 1rem; color: var(--legend); margin: 0; max-width: 34ch; }

/* Feature rows ------------------------------------------------------- */

.feature {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 32px clamp(32px, 5vw, 80px);
  padding: clamp(32px, 4vw, 56px) 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
.feature:first-of-type { padding-top: 8px; }
.feature:last-child { border-bottom: 0; }

.feature h3 {
  font-size: clamp(1.5rem, 1.2rem + 0.9vw, 2rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
}
.feature .text > p { max-width: 44ch; }

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 12px;
  border: var(--rim) solid var(--ink);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.ticks {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  max-width: 46ch;
}
.ticks li {
  position: relative;
  padding: 9px 0 9px 22px;
  border-top: 1px solid var(--rule);
  font-size: 1rem;
  line-height: 1.5;
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.05em;
  width: 10px;
  height: 2px;
  background: var(--ink);
}
.ticks li b { font-weight: 650; }

.more {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  font-weight: 600;
}

.figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 320px));
  gap: 28px;
  justify-content: end;
}
.figures.one { grid-template-columns: minmax(0, 340px); }
.figures.wide { grid-template-columns: minmax(0, 1fr) minmax(0, 250px); align-items: start; }

/* Get it ------------------------------------------------------------- */

.install {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px clamp(32px, 5vw, 80px);
}
.install h3 { font-size: 1.375rem; letter-spacing: -0.015em; margin-bottom: 10px; }
.install p { max-width: 46ch; }

pre {
  margin: 0 0 1.2em;
  padding: 16px 18px;
  border: 1px solid var(--ink);
  border-radius: 10px;
  overflow-x: auto;
  font-size: 0.84rem;
  line-height: 1.65;
  background: var(--paper);
  tab-size: 2;
}
pre code { font-size: inherit; overflow-wrap: normal; }
pre .c { color: var(--legend); }

.links {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: var(--engraved) solid var(--ink);
}
.links li { border-bottom: 1px solid var(--rule); }
.engraved + .links { border-top: 0; }
.links a {
  display: grid;
  grid-template-columns: minmax(0, 12em) minmax(0, 1fr);
  gap: 2px 20px;
  padding: 14px 0;
  text-decoration: none;
  min-height: 48px;
}
.links a strong { font-weight: 650; text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
.links a:hover strong { text-decoration-thickness: 2px; }
.links a span { color: var(--legend); font-size: 0.9375rem; line-height: 1.5; }

/* Footer ------------------------------------------------------------- */

.foot {
  margin-top: clamp(80px, 10vw, 144px);
  background: linear-gradient(var(--ink), var(--ink)) var(--margin) 0 / calc(100% - 2 * var(--margin)) var(--engraved) no-repeat;
  padding-top: 28px;
  padding-bottom: 48px;
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 28px clamp(32px, 5vw, 80px);
  font-size: 0.9375rem;
  line-height: 1.55;
  color: var(--legend);
}
.foot p { max-width: 64ch; }
.foot strong { color: var(--ink); font-weight: 650; }
.foot ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 20px; }
.foot ul a { display: inline-block; padding: 8px 0; color: var(--ink); }
.foot .sign { display: flex; gap: 12px; align-items: center; color: var(--ink); font-weight: 650; margin-bottom: 14px; }
.foot .sign img { width: 28px; height: 28px; image-rendering: pixelated; }

/* The technical page ------------------------------------------------- */

.doc-head {
  padding-top: clamp(24px, 5vw, 64px);
  padding-bottom: clamp(32px, 4vw, 48px);
  border-bottom: var(--engraved) solid var(--ink);
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 32px clamp(32px, 5vw, 80px);
  align-items: end;
}
.doc-head h1 {
  font-size: clamp(2.5rem, 1.4rem + 3.6vw, 4.5rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 720;
  margin-bottom: 0.35em;
}
.doc-head .lead { max-width: 36ch; margin-bottom: 0; }
.doc-head .readings div:last-child { border-bottom: 0; }

.doc {
  display: grid;
  grid-template-columns: minmax(200px, 250px) minmax(0, 1fr);
  gap: 0 clamp(40px, 6vw, 96px);
  align-items: start;
}

.toc {
  position: sticky;
  top: 24px;
  padding-top: 40px;
  font-size: 0.9375rem;
}
.toc h2 { font-size: 0.9375rem; font-weight: 650; padding-bottom: 10px; border-bottom: var(--engraved) solid var(--ink); }
.toc ol { list-style: none; margin: 0; padding: 0; counter-reset: toc; }
.toc li { counter-increment: toc; border-bottom: 1px solid var(--rule); }
.toc a {
  display: grid;
  grid-template-columns: 1.6em 1fr;
  padding: 10px 0;
  text-decoration: none;
  line-height: 1.35;
  min-height: 44px;
  align-items: baseline;
}
.toc a::before { content: counter(toc); color: var(--legend); font-stretch: 88%; font-weight: 600; }
.toc a:hover span { text-decoration: underline; }

.topic {
  padding-top: 40px;
  max-width: 76ch;
}
.topic + .topic { margin-top: clamp(40px, 6vw, 88px); }
.topic > p, .topic > ul, .topic > ol:not(.sequence) { max-width: 68ch; }
.topic h3 {
  font-size: 1.25rem;
  letter-spacing: -0.012em;
  margin: 2em 0 0.6em;
}
.topic ul:not(.links):not(.ticks), .topic ol.plain { padding-left: 1.2em; margin: 0 0 1.2em; }
.topic li { margin-bottom: 0.45em; }
.topic li::marker { color: var(--legend); }

.note {
  border: var(--rim) solid var(--ink);
  border-radius: 14px;
  padding: 16px 20px;
  margin: 1.6em 0;
  font-size: 1rem;
  max-width: 68ch;
}
.note p:last-child { margin-bottom: 0; }
.note h4 { display: flex; gap: 10px; align-items: baseline; font-size: 1rem; margin-bottom: 6px; }

/* A sequence drawn as a scale: steps in time */
.sequence {
  list-style: none;
  margin: 1.8em 0 2em;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(var(--steps, 4), minmax(0, 1fr));
  border-top: var(--engraved) solid var(--ink);
}
.sequence li {
  position: relative;
  padding: 22px 16px 0 0;
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.5;
}
.sequence li::before {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 2px;
  height: 14px;
  background: var(--ink);
}
.sequence .when {
  display: block;
  font-weight: 700;
  font-stretch: 88%;
  font-size: 1rem;
  margin-bottom: 4px;
  letter-spacing: -0.005em;
}
.sequence .what { color: var(--legend); display: block; }
.sequence .what code { color: var(--ink); }

.table-wrap { overflow-x: auto; margin: 1.4em 0 1.8em; }
table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9375rem;
  line-height: 1.45;
  font-variant-numeric: tabular-nums;
}
caption {
  text-align: left;
  caption-side: bottom;
  padding-top: 10px;
  font-size: 0.875rem;
  color: var(--legend);
}
th, td { text-align: left; vertical-align: top; padding: 10px 16px 10px 0; }
thead th { border-bottom: var(--engraved) solid var(--ink); font-weight: 650; white-space: nowrap; }
tbody th { font-weight: 600; }
tbody th code { white-space: nowrap; overflow-wrap: normal; }
tbody tr { border-bottom: 1px solid var(--rule); }
td.num, th.num { text-align: right; white-space: nowrap; padding-right: 20px; }

.sources { margin-top: 1.6em; }
.sources h3 { margin-top: 0 !important; font-size: 1rem !important; padding-bottom: 8px; }
.sources .links a { grid-template-columns: minmax(0, 1fr); padding: 11px 0; }
.sources .links a strong { font-family: var(--mono); font-weight: 500; font-size: 0.875rem; overflow-wrap: anywhere; }

/* Responsive --------------------------------------------------------- */

@media (max-width: 1080px) {
  .doc { grid-template-columns: minmax(0, 1fr); }
  .toc { position: static; padding-top: 32px; }
  .toc ol { columns: 2; column-gap: 32px; }
  .toc li { break-inside: avoid; }
}

@media (max-width: 960px) {
  .hero, .why, .feature, .install, .foot, .doc-head { grid-template-columns: minmax(0, 1fr); }
  .hero .lead { max-width: 34ch; }
  .figures, .figures.one { justify-content: start; }
  .tiers { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 28px; }
  .tiers::before { display: none; }
  .tier { padding-top: 0; }
  .principles { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .sequence { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 20px; border-top: 0; }
  .sequence li { border-top: var(--engraved) solid var(--ink); }
  .sequence li::before { top: -2px; }
}

@media (max-width: 600px) {
  body { font-size: 1.0625rem; }
  .nav .opt { display: none; }
  .tiers { grid-template-columns: minmax(0, 1fr); }
  .figures, .figures.wide { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
  .figures.one { grid-template-columns: minmax(0, 300px); }
  .figures.wide > :first-child { grid-column: 1 / -1; }
  .panel { padding: 6px; border-radius: 12px; }
  .panel img { border-radius: 4px; }
  .links a { grid-template-columns: minmax(0, 1fr); }
  .readings div { grid-template-columns: minmax(0, 1fr); }
  .toc ol { columns: 1; }
  .sequence { grid-template-columns: minmax(0, 1fr); }
  pre { font-size: 0.78rem; padding: 14px; }
  table.wide { min-width: 34rem; }
}

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

@media print {
  .nav, .skip, .keys, .toc { display: none; }
  .block, .foot { margin-top: 40px; }
  a { text-decoration: none; }
  .panel { break-inside: avoid; }
}

.after-scale { margin: 22px 0 0; }
.foot .quiet { margin-top: 14px; }