/* sysketch site: a sketchbook world. Warm paper, ink, and the three marker colors from the
   logo. Shantell Sans is the hand that labels the diagrams, so it sets the headlines too. */

@font-face {
  font-family: 'Shantell Sans';
  font-weight: 600;
  font-display: swap;
  src: url('fonts/shantell-sans-latin-600-normal.woff') format('woff');
}
@font-face {
  font-family: 'Shantell Sans';
  font-weight: 800;
  font-display: swap;
  src: url('fonts/shantell-sans-latin-800-normal.woff') format('woff');
}
@font-face {
  font-family: 'Atkinson Hyperlegible Next';
  font-weight: 400;
  font-display: swap;
  src: url('fonts/atkinson-hyperlegible-next-latin-400-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'Atkinson Hyperlegible Next';
  font-weight: 600;
  font-display: swap;
  src: url('fonts/atkinson-hyperlegible-next-latin-600-normal.woff2') format('woff2');
}
@font-face {
  font-family: 'JetBrains Mono';
  font-weight: 500;
  font-display: swap;
  src: url('fonts/jetbrains-mono-latin-500-normal.woff') format('woff');
}

:root {
  --paper: #fffdf7;
  --desk: #f6f1e4;
  --ink: #1f2328;
  --ink-2: #4f4a3f;
  --line: #ddd5c3;
  --line-strong: #b9b09b;
  --pink: #f783ac;
  --yellow: #ffc93c;
  --blue: #4cc3fc;
  --mark: #ffe08a;
  --link: #0b6e99;
  --code-bg: #f3eddf;
  --card: #fffef9;
  --shadow: 0 1px 1px rgb(20 22 26 / 0.06), 0 10px 28px -12px rgb(20 22 26 / 0.3);
  --hand: 'Shantell Sans', 'Comic Neue', cursive;
  --text: 'Atkinson Hyperlegible Next', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, monospace;
  --gutter: clamp(16px, 4vw, 64px);
  --max: 1640px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #1c1d22;
    --desk: #16171b;
    --ink: #f1f3f5;
    --ink-2: #c3bdb0;
    --line: #34353c;
    --line-strong: #4d4e57;
    --mark: #ffc93c;
    --link: #7fd3fd;
    --code-bg: #24252c;
    --card: #22232a;
    --shadow: 0 1px 1px rgb(0 0 0 / 0.3), 0 14px 32px -14px rgb(0 0 0 / 0.7);
    color-scheme: dark;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}
body {
  margin: 0;
  background: var(--desk);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--text);
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection {
  background: var(--mark);
  color: var(--ink);
}
html {
  scrollbar-color: var(--line-strong) transparent;
}
:focus-visible {
  outline: 2.5px solid var(--blue);
  outline-offset: 3px;
  border-radius: 6px;
}
img {
  max-width: 100%;
  height: auto;
  display: block;
}
a {
  color: var(--link);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
}
a:hover {
  text-decoration-color: var(--pink);
}
code {
  font: 500 0.88em/1.4 var(--mono);
  background: var(--code-bg);
  padding: 0.1em 0.4em;
  border-radius: 6px;
}
h1,
h2,
h3 {
  font-family: var(--hand);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-wrap: balance;
  margin: 0;
}
h2 {
  font-size: clamp(1.75rem, 1.2rem + 2.2vw, 2.75rem);
  margin-bottom: 0.6em;
}
h3 {
  font-size: 1.2rem;
  font-weight: 600;
}
p {
  margin: 0 0 1em;
  text-wrap: pretty;
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}
.dim {
  color: var(--ink-2);
  font-weight: 400;
}
.skip {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 20;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 14px;
  border-radius: 8px;
}
.skip:focus {
  top: 12px;
}

/* ---------- header ---------- */
.top {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--desk) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.top-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px var(--gutter);
  display: flex;
  align-items: center;
  gap: 16px;
}
.brand img {
  width: 150px;
  height: auto;
}
.brand-dark {
  display: none;
}
@media (prefers-color-scheme: dark) {
  .brand-light {
    display: none;
  }
  .brand-dark {
    display: block;
  }
}
.nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 4px;
}
.nav a {
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 8px;
}
.nav a:hover {
  background: var(--code-bg);
}
.nav-gh {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1.5px solid var(--ink);
  margin-left: 6px;
}
.nav-gh svg {
  fill: currentColor;
}
.menu-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1.5px solid var(--line-strong);
  border-radius: 8px;
  padding: 7px;
  color: var(--ink);
  cursor: pointer;
}
.menu-toggle svg {
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  fill: none;
  display: block;
}
@media (max-width: 760px) {
  .menu-toggle {
    display: block;
  }
  .nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    padding: 8px var(--gutter) 16px;
    background: var(--desk);
    border-bottom: 1px solid var(--line);
  }
  .nav.open {
    display: flex;
  }
  .nav a {
    padding: 12px;
  }
  .nav-gh {
    margin: 8px 0 0;
    justify-content: center;
  }
}

/* ---------- shared layout: full-width bands, content up to --max ---------- */
main > section {
  padding: clamp(56px, 7vw, 104px) max(var(--gutter), calc((100% - var(--max)) / 2));
}
main > section + section {
  padding-top: clamp(40px, 5vw, 72px);
}
main > .band,
main > .band + section {
  padding-top: clamp(56px, 7vw, 104px);
}
.band {
  background: var(--paper);
  border-block: 1px solid var(--line);
}

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 520px);
  gap: clamp(24px, 4vw, 72px);
  align-items: end;
}
main > .hero {
  padding-top: clamp(32px, 4.5vw, 72px);
}
.hero h1 {
  font-size: clamp(2.5rem, 1rem + 4vw, 5rem);
  letter-spacing: -0.03em;
  line-height: 1.02;
}
.mark {
  background: linear-gradient(transparent 58%, var(--mark) 58%, var(--mark) 92%, transparent 92%);
}
@media (prefers-color-scheme: dark) {
  /* on dark paper the marker underlines instead of filling behind light ink */
  .mark {
    background: none;
    text-decoration: underline var(--yellow);
    text-decoration-thickness: 0.09em;
    text-underline-offset: 0.12em;
  }
}
.mark {
  padding: 0 0.08em;
  margin: 0 -0.08em;
  -webkit-box-decoration-break: clone;
  box-decoration-break: clone;
}
.lede {
  font-size: clamp(1.1rem, 1rem + 0.4vw, 1.3rem);
  color: var(--ink-2);
  max-width: 34em;
  margin: 1.1em 0 0;
}
.hero-sheet {
  grid-column: 1 / -1;
  margin: clamp(8px, 2vw, 24px) 0 0;
  background: #fffdf7;
  color: #1f2328;
  border-radius: 10px;
  box-shadow: var(--shadow);
  padding: clamp(6px, 1.4vw, 20px) clamp(6px, 1.4vw, 20px) 0;
}
.hero-sheet figcaption {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  border-top: 1.5px dashed #ddd5c3;
  padding: 10px 4px 12px;
  font-size: 0.92rem;
  color: #4f4a3f;
}
.motion {
  font: 600 0.88rem var(--text);
  color: #1f2328;
  background: none;
  border: 1.5px solid #b9b09b;
  border-radius: 8px;
  padding: 5px 12px;
  cursor: pointer;
}
.motion:hover {
  border-color: #1f2328;
}
.live-art img,
.live-art svg {
  display: block;
  width: 100%;
  height: auto;
}
/* request packets drawn by app.js along each arrow */
[data-motion='off'] .sk-pkt {
  display: none;
}
.get {
  background: var(--card);
  border: 1.5px solid var(--ink);
  border-radius: 14px;
  padding: 18px;
  min-width: 0;
}
.get p {
  font-size: 0.95rem;
  color: var(--ink-2);
  margin: 12px 0 10px;
}
.tabs {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}
.tabs [role='tab'] {
  font: 600 0.92rem var(--text);
  color: var(--ink-2);
  background: none;
  border: 0;
  border-radius: 8px;
  padding: 7px 11px;
  cursor: pointer;
}
.tabs [role='tab']:hover {
  color: var(--ink);
  background: var(--code-bg);
}
.tabs [role='tab'][aria-selected='true'] {
  color: var(--ink);
  background: var(--code-bg);
  box-shadow: inset 0 -2.5px 0 var(--pink);
}
.copy-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bg);
  border-radius: 10px;
  padding: 6px 6px 6px 12px;
}
.copy-row code {
  flex: 1;
  min-width: 0;
  background: none;
  padding: 0;
  overflow-x: auto;
  white-space: nowrap;
  scrollbar-width: none;
  font-size: 0.85rem;
}
.copy,
.presets button,
.open {
  font: 600 0.9rem var(--text);
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}
.copy {
  background: var(--ink);
  color: var(--paper);
  border: 0;
  padding: 8px 14px;
  transition: transform 0.15s cubic-bezier(0.22, 1, 0.36, 1);
}
.copy:hover {
  transform: translateY(-1px);
}
.copy:active {
  transform: translateY(1px);
}
.copy[data-done] {
  background: #2f7d4f;
}

/* ---------- try it: an index card on the desk, the drawing on a sheet ---------- */
.try {
  padding-top: clamp(32px, 5vw, 56px) !important;
}
.desk {
  display: grid;
  grid-template-columns: minmax(280px, 420px) minmax(0, 1fr);
  gap: 0;
  align-items: start;
}
.card {
  position: relative;
  z-index: 2;
  margin-top: 36px;
  margin-right: -28px;
  background: var(--card);
  border: 1.5px solid var(--ink);
  border-radius: 12px;
  padding: 14px 14px 10px;
  transform: rotate(-0.8deg);
}
.card-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}
.card-head label {
  font: 600 1rem var(--hand);
}
.presets {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.presets button {
  background: none;
  color: var(--ink);
  border: 1.5px solid var(--line-strong);
  padding: 4px 10px;
  font-size: 0.85rem;
}
.presets button:hover {
  border-color: var(--ink);
}
.presets button[aria-pressed='true'] {
  background: var(--yellow);
  border-color: var(--ink);
  color: #1f2328;
}
#spec {
  width: 100%;
  min-height: 330px;
  resize: vertical;
  border: 0;
  border-top: 1.5px dashed var(--line-strong);
  background: linear-gradient(var(--card), var(--card)) padding-box;
  color: var(--ink);
  font: 500 0.82rem/1.65 var(--mono);
  padding: 10px 2px 0;
  tab-size: 2;
  caret-color: var(--pink);
}
#spec:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px var(--blue);
  border-radius: 6px;
}
.hint {
  font-size: 0.85rem;
  color: var(--ink-2);
  margin: 8px 0 2px;
}
.sheet {
  margin: 0;
  color: #1f2328;
  min-width: 0;
  background: #fffdf7;
  border-radius: 6px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.sheet-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px 10px 44px;
  border-bottom: 1px solid #e9e2d1;
  color: #4f4a3f;
  font-size: 0.9rem;
}
.theme-pick {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}
.theme-pick select {
  font: 500 0.9rem var(--text);
  color: #1f2328;
  background: #fffef9;
  border: 1.5px solid #b9b09b;
  border-radius: 8px;
  padding: 5px 8px;
}
.status {
  flex: 1;
  min-width: 0;
  color: #4f4a3f;
}
.open {
  color: #1f2328;
  border: 1.5px solid #1f2328;
  padding: 5px 12px;
  text-decoration: none;
}
.open:hover {
  background: #ffe08a;
}
.sheet-paper {
  position: relative;
  min-height: 420px;
  display: grid;
  place-items: center;
  padding: 12px 12px 12px 44px;
}
#diagram {
  width: 100%;
  max-height: min(760px, 80vh);
  object-fit: contain;
  transition:
    opacity 0.45s cubic-bezier(0.16, 1, 0.3, 1),
    filter 0.45s cubic-bezier(0.16, 1, 0.3, 1);
}
#diagram.drawing {
  opacity: 0.35;
  filter: blur(3px) saturate(0.6);
}
@media (prefers-reduced-motion: reduce) {
  #diagram {
    transition: none;
  }
}
.error {
  position: absolute;
  inset: auto 16px 16px 60px;
  margin: 0;
  background: #fff1f4;
  color: #8a1538;
  border: 1.5px solid #e46a8f;
  border-radius: 10px;
  padding: 10px 14px;
  font: 500 0.85rem/1.5 var(--mono);
}
@media (max-width: 860px) {
  .desk {
    grid-template-columns: 1fr;
  }
  .card {
    margin: 0 0 -16px;
    transform: none;
  }
  #spec {
    min-height: 220px;
  }
  .sheet-bar,
  .sheet-paper {
    padding-left: 14px;
  }
  .sheet-bar {
    padding-top: 26px;
    flex-wrap: wrap;
  }
  .sheet-paper {
    min-height: 260px;
  }
  .error {
    inset: auto 12px 12px 12px;
  }
}

/* ---------- why ---------- */
.why {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.why-copy > p {
  max-width: 36em;
}
.bars {
  margin: 28px 0 14px;
  display: grid;
  gap: 12px;
}
.bar-row {
  display: grid;
  grid-template-columns: 8.5em minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
}
.bar-label {
  color: var(--ink-2);
}
.track {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.fill {
  height: 28px;
  width: var(--w);
  min-width: 10px;
  background: var(--line-strong);
  border-radius: 6px;
}
.fill-us {
  background: var(--pink);
}
.val {
  font: 600 0.88rem var(--text);
  white-space: nowrap;
}
.fine {
  font-size: 0.9rem;
  color: var(--ink-2);
}
.compare {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.compare figure {
  margin: 0;
}
.compare img {
  background: #fff;
  border: 1.5px solid var(--line-strong);
  border-radius: 8px;
  aspect-ratio: 4 / 3;
  object-fit: contain;
  width: 100%;
}
.compare figcaption {
  font: 600 0.95rem var(--hand);
  margin-top: 8px;
}
.compare figure:last-child img {
  border-color: var(--ink);
}

/* ---------- examples ---------- */
.examples h2 {
  max-width: 18em;
}
.tabs-wide {
  margin-bottom: 14px;
}
.example {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: 28px;
  align-items: start;
  background: #fffdf7;
  border-radius: 6px;
  box-shadow: var(--shadow);
  padding: 28px;
  color: #1f2328;
}
.example .live-art {
  display: grid;
  place-items: center;
  min-height: 320px;
}
.example .live-art img,
.example .live-art svg {
  max-height: min(760px, 80vh);
}
.example-side {
  border-left: 1.5px dashed #ddd5c3;
  padding-left: 24px;
  min-width: 0;
}
.example-note {
  color: #4f4a3f;
  margin: 0 0 12px;
}
.example-spec {
  margin-top: 16px;
  border-top: 1.5px dashed #ddd5c3;
  padding-top: 12px;
}
.example-spec summary {
  cursor: pointer;
  font: 600 1rem var(--hand);
  width: fit-content;
}
.example-spec pre {
  background: #f3eddf;
  color: #1f2328;
  border-radius: 10px;
  padding: 14px 16px;
  overflow: auto;
  max-height: min(560px, 60vh);
  margin: 12px 0 0;
}
.example-spec code {
  background: none;
  padding: 0;
  font-size: 0.82rem;
}

/* ---------- themes ---------- */
.themes {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}
.swatches {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}
.swatches button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font: 600 0.92rem var(--text);
  color: var(--ink);
  background: var(--card);
  border: 1.5px solid var(--line-strong);
  border-radius: 999px;
  padding: 6px 14px 6px 6px;
  cursor: pointer;
}
.swatches button[aria-checked='true'] {
  border-color: var(--ink);
  box-shadow: 0 0 0 2px var(--ink) inset;
}
.sw {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid rgb(0 0 0 / 0.2);
}
.sw-sketch {
  background: conic-gradient(var(--pink) 0 33%, var(--yellow) 0 66%, var(--blue) 0);
}
.sw-graphite {
  background: #2c2e33;
}
.sw-blueprint {
  background: #0f2a5c;
}
.sw-midnight {
  background: #0a1020;
}
.sw-classic {
  background: #f7f9fc;
}
.themes-img {
  width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow);
  transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- language ---------- */
.language {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(24px, 5vw, 64px);
  align-items: center;
}
.language-copy p {
  max-width: 34em;
}
q {
  font-family: var(--mono);
  font-size: 0.85em;
  quotes: none;
  background: #fff1f4;
  color: #8a1538;
  padding: 0.1em 0.4em;
  border-radius: 6px;
}
.index-card {
  position: relative;
  background: #fffef9;
  border: 1.5px solid #1f2328;
  border-radius: 6px;
  padding: 46px 22px 22px;
  transform: rotate(0.6deg);
  color: #1f2328;
  overflow-x: auto;
}
.index-card::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 36px;
  border-top: 2px solid #f4a5bf;
}
.index-card pre {
  margin: 0;
}
.index-card code {
  background: none;
  padding: 0;
  font-size: 0.82rem;
  line-height: 26px;
}
.index-card .k {
  color: #08597d;
}
.index-card .c {
  color: #5f5a4c;
}

/* ---------- where ---------- */
.where-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 4vw, 48px);
  border-top: 1.5px solid var(--ink);
  padding-top: 24px;
}
.where-cols h3 {
  margin-bottom: 8px;
}
.where-cols p {
  color: var(--ink-2);
  font-size: 0.98rem;
}

/* ---------- install ---------- */
.options {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px clamp(20px, 4vw, 48px);
}
.options li {
  border-top: 1.5px dashed var(--line-strong);
  padding-top: 16px;
}
.options h3 {
  margin-bottom: 6px;
}
.options p {
  color: var(--ink-2);
  font-size: 0.98rem;
}
.ask {
  margin-top: 28px;
  background: var(--card);
  border: 1.5px solid var(--ink);
  border-radius: 14px;
  padding: 18px 22px;
  max-width: 46em;
}
.ask h3 {
  margin-bottom: 6px;
}
.ask p {
  margin: 0;
  font: 600 1.05rem/1.5 var(--hand);
}
.more {
  margin-top: 24px;
  color: var(--ink-2);
}

/* ---------- footer ---------- */
.foot {
  border-top: 1px solid var(--line);
}
.foot-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px var(--gutter) 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 14px;
  align-items: center;
  font-size: 0.92rem;
}
.foot-inner img {
  grid-row: span 2;
}
.foot-inner p {
  margin: 0;
}
.foot .dim {
  font-size: 0.85rem;
}

/* ---------- small screens ---------- */
@media (max-width: 1100px) {
  .example {
    grid-template-columns: minmax(0, 1fr);
  }
  .example-side {
    border-left: 0;
    padding-left: 0;
  }
  .example .live-art {
    min-height: 0;
  }
}
@media (max-width: 960px) {
  .hero,
  .why,
  .themes,
  .language {
    grid-template-columns: minmax(0, 1fr);
  }
  .hero {
    align-items: start;
  }
  .where-cols,
  .options {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 600px) {
  .example {
    padding: 18px;
  }
}
@media (max-width: 520px) {
  .compare {
    grid-template-columns: 1fr;
  }
  .bar-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }
  .index-card {
    transform: none;
  }
}

/* Code must look exactly as typed: no "--" dashes or "=>" arrows from font ligatures.
   Last in the file so no later `font:` shorthand turns them back on. */
code,
pre,
pre *,
#spec {
  font-variant-ligatures: none;
  font-feature-settings:
    'calt' 0,
    'liga' 0,
    'dlig' 0;
}