/* Tokens */
:root {
  --bg: #FAF7F2;
  --ink: #0F0E0D;
  --muted: #6B5F55;
  --rule: #988A7C;
  --hairline: #E6DFD4;
  --accent: #A84B2A;
  --band-accent: #E08A62;

  --sans: 'DM Sans', system-ui, sans-serif;
  --mono: 'DM Mono', ui-monospace, monospace;

  --size-display: clamp(2.75rem, 7vw, 5rem);
  --size-heading: clamp(1.5rem, 3vw, 1.75rem);
  --size-body: 1.0625rem;
  --size-label: 0.75rem;

  --gutter: 16px;
  --margin: 20px;
  --section-gap: 80px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0F0E0D;
    --ink: #F5F1EA;
    --muted: #A89C8F;
    --rule: #6E645A;
    --hairline: #2A2622;
    --accent: #E08A62;
    --band-accent: #A84B2A;
    color-scheme: dark;
  }
}

:root[data-theme="dark"] {
  --bg: #0F0E0D;
  --ink: #F5F1EA;
  --muted: #A89C8F;
  --rule: #6E645A;
  --hairline: #2A2622;
  --accent: #E08A62;
  --band-accent: #A84B2A;
  color-scheme: dark;
}

@media (min-width: 640px) {
  :root { --gutter: 24px; --margin: 40px; }
}

@media (min-width: 1024px) {
  :root { --margin: 80px; --section-gap: 128px; --size-body: 1.125rem; }
}

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

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--size-body);
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, p, ul, ol, dl, dd, figure { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { display: block; max-width: 100%; }

a { color: inherit; text-decoration: none; }

.link {
  background: linear-gradient(currentColor, currentColor) no-repeat 0 100% / 0 1px;
  transition: background-size 200ms ease, color 200ms ease;
  padding-bottom: 2px;
}
.link:hover, .link:focus-visible { background-size: 100% 1px; color: var(--accent); }

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

.skip {
  position: absolute; left: var(--margin); top: -100px;
  background: var(--ink); color: var(--bg); padding: 8px 12px;
  font-family: var(--mono); font-size: var(--size-label); z-index: 10;
}
.skip:focus { top: 12px; }

.label {
  font-family: var(--mono);
  font-size: var(--size-label);
  line-height: 1.4;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

.wrap {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--margin);
}

/* 12-column grid */
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  column-gap: var(--gutter);
}
@media (min-width: 640px) { .grid { grid-template-columns: repeat(8, 1fr); } }
@media (min-width: 1024px) { .grid { grid-template-columns: repeat(12, 1fr); } }

/* Header */
.site-header {
  border-bottom: 1px solid var(--hairline);
}
.site-header .wrap {
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; min-height: 64px;
}
.site-header nav ul { display: flex; gap: 24px; align-items: center; }
.site-header nav .nav-sections { display: none; }
@media (min-width: 768px) { .site-header nav .nav-sections { display: flex; gap: 24px; } }
.brand { color: var(--ink); }

.theme-toggle {
  font: inherit; font-family: var(--mono); font-size: var(--size-label);
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); background: none; border: 1px solid var(--hairline);
  padding: 6px 10px; cursor: pointer;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* Hero */
.hero { position: relative; padding: 48px 0 56px; }
@media (min-width: 1024px) { .hero { padding: 72px 0 96px; } }

.hero-frame {
  position: relative;
  padding: 56px 24px 48px;
  background-image: radial-gradient(var(--hairline) 1px, transparent 1px);
  background-size: 24px 24px;
  background-position: 12px 12px;
}
@media (min-width: 1024px) { .hero-frame { padding: 96px 48px 72px; } }

.crop { position: absolute; width: 14px; height: 14px; border-color: var(--rule); border-style: solid; border-width: 0; }
.crop.tl { top: 0; left: 0; border-top-width: 1px; border-left-width: 1px; }
.crop.tr { top: 0; right: 0; border-top-width: 1px; border-right-width: 1px; }
.crop.bl { bottom: 0; left: 0; border-bottom-width: 1px; border-left-width: 1px; }
.crop.br { bottom: 0; right: 0; border-bottom-width: 1px; border-right-width: 1px; }

.hero-meta-top { position: absolute; top: 16px; right: 24px; }
.hero-meta-bottom { position: absolute; bottom: 16px; right: 24px; }
@media (min-width: 1024px) { .hero-meta-top, .hero-meta-bottom { right: 48px; } }

.display {
  font-size: var(--size-display);
  font-weight: 300;
  letter-spacing: -0.035em;
  line-height: 1.02;
}
.hero-line { margin-top: 24px; max-width: 34ch; }
.hero-loc { margin-top: 12px; }

.hero-actions { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block;
  font-family: var(--mono); font-size: var(--size-label);
  letter-spacing: 0.08em; text-transform: uppercase;
  padding: 14px 20px;
  border: 1px solid var(--ink);
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}
.btn-solid { background: var(--ink); color: var(--bg); }
.btn-solid:hover, .btn-solid:focus-visible { background: var(--accent); border-color: var(--accent); color: var(--bg); }
.btn-line { color: var(--ink); }
.btn-line:hover, .btn-line:focus-visible { color: var(--accent); border-color: var(--accent); }

/* Sections */
.section { border-top: 1px solid var(--hairline); padding: 40px 0 var(--section-gap); }
@media (min-width: 1024px) { .section { padding-top: 48px; } }

.section-label { grid-column: 1 / -1; margin-bottom: 24px; }
.section-body { grid-column: 1 / -1; }
@media (min-width: 1024px) {
  .section-label { grid-column: 1 / 4; margin-bottom: 0; }
  .section-body { grid-column: 4 / 13; }
}

.heading {
  font-size: var(--size-heading);
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

/* Systems list */
.systems li + li { border-top: 1px solid var(--hairline); }
.system {
  display: grid; gap: 20px;
  padding: 28px 0;
  grid-template-columns: 1fr;
}
.systems li:first-child .system { padding-top: 0; }
@media (min-width: 768px) { .system { grid-template-columns: 1fr 220px; align-items: center; } }
.system .heading { font-weight: 400; }
.system p { color: var(--muted); margin-top: 6px; }
.system .label { margin-top: 12px; display: block; }
.system:hover .heading, .system:focus-visible .heading { color: var(--accent); }
.system-thumb { border: 1px solid var(--hairline); padding: 16px; }
.system-thumb svg { width: 100%; height: auto; }

/* Experience table */
.timeline { width: 100%; border-collapse: collapse; }
.timeline caption { text-align: left; padding-bottom: 12px; }
.timeline th, .timeline td {
  text-align: left; vertical-align: top;
  padding: 14px 16px 14px 0;
  border-bottom: 1px solid var(--hairline);
  font-family: var(--mono); font-size: var(--size-label);
  letter-spacing: 0.08em; text-transform: uppercase;
  font-weight: 400;
}
.timeline th { color: var(--ink); }
.timeline td { color: var(--muted); }
.timeline td:last-child { text-align: right; padding-right: 0; white-space: nowrap; }
.timeline tr:first-child th, .timeline tr:first-child td { border-top: 1px solid var(--hairline); }
.timeline + .timeline { margin-top: 48px; }
@media (max-width: 639px) {
  .timeline tr { display: grid; grid-template-columns: 1fr auto; border-bottom: 1px solid var(--hairline); padding: 12px 0; }
  .timeline tr:first-child { border-top: 1px solid var(--hairline); }
  .timeline th, .timeline td { border: 0 !important; padding: 2px 0; }
  .timeline td.org { grid-column: 1 / 2; }
  .timeline td:last-child { grid-row: 1; grid-column: 2; }
}

.currently { margin-top: 56px; }
.currently ul { margin-top: 16px; }
.currently li { padding: 10px 0; border-bottom: 1px solid var(--hairline); }
.currently li:first-child { border-top: 1px solid var(--hairline); }

/* About */
.prose p + p { margin-top: 1em; }
.prose { max-width: 62ch; }

/* Contact band */
.band {
  background: var(--ink); color: var(--bg);
  --muted-band: color-mix(in srgb, var(--bg) 70%, var(--ink));
}
.band .section { border-top: 0; padding-bottom: 96px; }
.band .label { color: var(--muted-band); }
.band .contact-list li { border-bottom: 1px solid color-mix(in srgb, var(--bg) 18%, var(--ink)); }
.band .contact-list li:first-child { border-top: 1px solid color-mix(in srgb, var(--bg) 18%, var(--ink)); }
.band .link:hover, .band .link:focus-visible { color: var(--band-accent); }
.band :focus-visible { outline-color: var(--band-accent); }

.contact-list li {
  display: grid; grid-template-columns: 1fr; gap: 4px; padding: 18px 0;
}
@media (min-width: 640px) { .contact-list li { grid-template-columns: 160px 1fr; align-items: baseline; } }
.contact-list a { font-size: var(--size-heading); font-weight: 300; letter-spacing: -0.02em; word-break: break-word; }

.site-footer { padding: 24px 0 40px; }
.site-footer.band { border-top: 1px solid color-mix(in srgb, var(--bg) 18%, var(--ink)); }
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* Case study pages */
.case-head { padding: 48px 0 40px; }
@media (min-width: 1024px) { .case-head { padding: 72px 0 56px; } }
.case-head .display { margin-top: 20px; }
.case-head .hero-line { color: var(--muted); }

.case-meta {
  margin-top: 40px; display: grid; gap: 20px 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
@media (min-width: 1024px) { .case-meta { grid-template-columns: repeat(4, minmax(0, 1fr)); } }
.case-meta dd { margin-top: 6px; font-size: 1rem; }

.figure { border-top: 1px solid var(--hairline); padding: 40px 0 24px; }
.figure-frame {
  position: relative; padding: 32px 16px;
  background-image: radial-gradient(var(--hairline) 1px, transparent 1px);
  background-size: 24px 24px;
  overflow-x: auto;
}
@media (min-width: 1024px) { .figure-frame { padding: 48px; } }
.figure-frame svg { min-width: 640px; width: 100%; height: auto; margin: 0 auto; }
.figure figcaption { margin-top: 16px; }

.case-section { border-top: 1px solid var(--hairline); padding: 36px 0; }
.case-section .section-body > * + * { margin-top: 1em; }
.case-section ul.list li { padding-left: 20px; position: relative; }
.case-section ul.list li + li { margin-top: 0.6em; }
.case-section ul.list li::before {
  content: ''; position: absolute; left: 0; top: 0.8em; width: 8px; height: 1px; background: var(--rule);
}
.case-section.inverted { background: var(--ink); color: var(--bg); border-top: 0; }
.case-section.inverted .label { color: color-mix(in srgb, var(--bg) 70%, var(--ink)); }
.case-section.inverted code { background: color-mix(in srgb, var(--bg) 12%, var(--ink)); }
.full-bleed { margin: 0 calc(var(--margin) * -1); padding-left: var(--margin); padding-right: var(--margin); }

code {
  font-family: var(--mono); font-size: 0.85em;
  background: var(--hairline); padding: 1px 5px;
}

.pager { border-top: 1px solid var(--hairline); padding: 28px 0 56px; }
.pager .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* Diagrams */
.dia text { font-family: var(--mono); font-size: 11px; letter-spacing: 0.04em; fill: var(--ink); }
.dia .t-muted { fill: var(--muted); font-size: 10px; }
.dia .t-strong { font-family: var(--sans); font-size: 14px; letter-spacing: 0; font-weight: 500; }
.dia .box { fill: var(--bg); stroke: var(--rule); stroke-width: 1; }
.dia .box-accent { fill: color-mix(in srgb, var(--accent) 10%, var(--bg)); stroke: var(--accent); stroke-width: 1.5; }
.dia .zone { fill: none; stroke: var(--rule); stroke-width: 1; stroke-dasharray: 3 4; }
.dia .line { fill: none; stroke: var(--rule); stroke-width: 1; }
.dia .arrow-head { fill: var(--rule); }

/* Motion */
.reveal { opacity: 0; transform: translateY(8px); transition: opacity 400ms ease-out, transform 400ms ease-out; }
.reveal.in { opacity: 1; transform: none; }
.draw .line, .draw .box, .draw .box-accent { stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 900ms ease-out; }
.draw .zone { opacity: 0; transition: opacity 900ms ease-out; }
.draw.in .line, .draw.in .box, .draw.in .box-accent { stroke-dashoffset: 0; }
.draw.in .zone { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .draw .line, .draw .box, .draw .box-accent { stroke-dasharray: none; stroke-dashoffset: 0; transition: none; }
  .draw .zone { opacity: 1; transition: none; }
  .link, .btn { transition: none; }
}

.no-js .reveal { opacity: 1; transform: none; }
.no-js .draw .line, .no-js .draw .box, .no-js .draw .box-accent { stroke-dasharray: none; stroke-dashoffset: 0; }
.no-js .draw .zone { opacity: 1; }

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