/* ==========================================================================
   dataarchitect.studio
   An editorial-architectural design system.
   Paper + ink + a single vermilion accent. Blueprint hairlines.
   ========================================================================== */

/* ---- Tokens -------------------------------------------------------------- */
:root {
  --paper:      #f6f3ec;
  --paper-deep: #efe9dd;
  --ink:        #1c1a17;
  --ink-soft:   #56514a;
  --ink-faint:  #8b857a;
  --accent:     #c8472b;
  --accent-deep:#a4391f;
  --line:       #ddd6c8;
  --line-strong:#cabfac;

  --serif-display: 'Fraunces', Georgia, 'Times New Roman', serif;
  --serif-body:    'Newsreader', Georgia, serif;
  --mono:          'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

  --measure: 38rem;          /* reading column */
  --gutter: clamp(1.25rem, 5vw, 4rem);
  --maxw: 72rem;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---- Reset --------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--serif-body);
  font-size: 1.125rem;
  line-height: 1.65;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint paper grain */
  background-image:
    radial-gradient(transparent 0, rgba(0,0,0,0.014) 100%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.025'/%3E%3C/svg%3E");
}

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

a {
  color: var(--ink);
  text-decoration: none;
}

::selection { background: var(--accent); color: var(--paper); }

/* ---- Layout shell -------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ---- Masthead ------------------------------------------------------------ */
.masthead {
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(120%) blur(8px);
}
.masthead__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.1rem;
}
.brand {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  font-weight: 500;
  color: var(--ink);
  display: inline-flex;
  align-items: baseline;
  gap: 0.55rem;
}
.brand .mark {
  color: var(--accent);
  font-weight: 600;
}
.nav {
  display: flex;
  gap: 1.6rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.nav a {
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 2px;
  transition: color 0.25s var(--ease);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -1px;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.32s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { transform: scaleX(1); }

/* ---- Hero ---------------------------------------------------------------- */
.hero {
  padding-block: clamp(4rem, 11vw, 9rem) clamp(2.5rem, 6vw, 5rem);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
/* blueprint grid wash, right side */
.hero::after {
  content: "";
  position: absolute;
  inset: 0 0 0 auto;
  width: 40%;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 85%);
          mask-image: linear-gradient(90deg, transparent, #000 85%);
  opacity: 0.5;
  pointer-events: none;
}
.hero__kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.4rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.hero__kicker::before {
  content: "";
  width: 2.4rem;
  height: 1px;
  background: var(--accent);
  display: inline-block;
}
.hero h1 {
  font-family: var(--serif-display);
  font-weight: 380;
  font-size: clamp(2.6rem, 7.5vw, 5.25rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  margin: 0;
  max-width: 16ch;
}
.hero h1 em {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}
.hero__lede {
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 46ch;
  margin: 2rem 0 0;
}

/* ---- Section heading ----------------------------------------------------- */
.section-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding-block: 2.4rem 0;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.section-label .count { color: var(--accent); }

/* ---- Essay index --------------------------------------------------------- */
.essays { padding-bottom: clamp(3rem, 8vw, 6rem); }
.essay-row {
  display: grid;
  grid-template-columns: 4.5rem 1fr auto;
  gap: 1.5rem;
  align-items: baseline;
  padding-block: 2.1rem;
  border-bottom: 1px solid var(--line);
  transition: background 0.3s var(--ease);
}
.essay-row:first-of-type { border-top: 1px solid var(--line); }
.essay-row:hover { background: var(--paper-deep); }
.essay-row__no {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  padding-top: 0.45rem;
}
.essay-row__body { min-width: 0; }
.essay-row__kicker {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}
.essay-row__title {
  font-family: var(--serif-display);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  line-height: 1.08;
  letter-spacing: -0.012em;
  margin: 0 0 0.55rem;
  transition: color 0.25s var(--ease);
}
.essay-row:hover .essay-row__title { color: var(--accent-deep); }
.essay-row__excerpt {
  color: var(--ink-soft);
  font-size: 1.02rem;
  line-height: 1.55;
  margin: 0;
  max-width: 58ch;
}
.essay-row__meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
  text-align: right;
  white-space: nowrap;
  padding-top: 0.5rem;
  line-height: 1.7;
}
.essay-row__meta .read { color: var(--ink-soft); display: block; }

/* ---- Article (post) ------------------------------------------------------ */
.article { padding-block: clamp(3rem, 8vw, 6rem) 0; }
.article__head {
  max-width: var(--measure);
  margin-inline: auto;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}
.article__kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.3rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
}
.article__kicker::before {
  content: "";
  width: 2rem; height: 1px;
  background: var(--accent);
  display: inline-block;
}
.article__title {
  font-family: var(--serif-display);
  font-weight: 380;
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
  line-height: 1.04;
  letter-spacing: -0.018em;
  margin: 0 0 1.5rem;
}
.article__meta {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  display: flex;
  gap: 1.4rem;
  flex-wrap: wrap;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}
.article__meta .dot { color: var(--accent); }

/* prose */
.prose {
  max-width: var(--measure);
  margin-inline: auto;
  font-size: 1.18rem;
  line-height: 1.72;
  color: var(--ink);
}
.prose > p:first-of-type::first-letter {
  font-family: var(--serif-display);
  font-weight: 420;
  float: left;
  font-size: 3.9em;
  line-height: 0.72;
  padding: 0.08em 0.14em 0 0;
  color: var(--accent);
}
.prose p { margin: 0 0 1.5rem; }
.prose h2 {
  font-family: var(--serif-display);
  font-weight: 440;
  font-size: 1.72rem;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 3.2rem 0 1.1rem;
}
.prose h3 {
  font-family: var(--serif-display);
  font-weight: 500;
  font-size: 1.28rem;
  margin: 2.4rem 0 0.8rem;
}
.prose a {
  color: var(--accent-deep);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  transition: text-decoration-color 0.25s var(--ease);
}
.prose a:hover { text-decoration-color: var(--accent); }
.prose strong { font-weight: 600; }
.prose em { font-style: italic; }
.prose blockquote {
  margin: 2.2rem 0;
  padding: 0.2rem 0 0.2rem 1.6rem;
  border-left: 2px solid var(--accent);
  font-family: var(--serif-display);
  font-style: italic;
  font-weight: 360;
  font-size: 1.4rem;
  line-height: 1.4;
  color: var(--ink-soft);
}
.prose ul, .prose ol { margin: 0 0 1.5rem; padding-left: 1.4rem; }
.prose li { margin-bottom: 0.5rem; padding-left: 0.3rem; }
.prose li::marker { color: var(--accent); }
.prose hr {
  border: 0;
  height: 1px;
  background: var(--line);
  margin: 3rem auto;
  width: 100%;
}
.prose code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--paper-deep);
  padding: 0.12em 0.4em;
  border-radius: 3px;
  border: 1px solid var(--line);
}
.prose pre {
  background: #201d19;
  color: #ece6da;
  padding: 1.3rem 1.4rem;
  border-radius: 6px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.92rem;
  line-height: 1.55;
  margin: 2rem 0;
}
.prose pre code {
  background: none; border: 0; padding: 0; font-size: inherit; color: inherit;
}

/* article footer / colophon */
.article__foot {
  max-width: var(--measure);
  margin: clamp(3rem, 7vw, 5rem) auto 0;
  padding-block: 2.2rem clamp(4rem, 9vw, 7rem);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.8rem;
}
.article__foot a {
  color: var(--accent-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.article__foot a:hover { color: var(--accent); }
.signoff { color: var(--ink-faint); margin-top: 1.5rem; line-height: 1.7; }

/* ---- Generic page (about) ------------------------------------------------ */
.page-head {
  max-width: var(--measure);
  margin-inline: auto;
  padding-block: clamp(3.5rem, 9vw, 6.5rem) 0;
}
.page-head h1 {
  font-family: var(--serif-display);
  font-weight: 380;
  font-size: clamp(2.3rem, 6vw, 3.6rem);
  line-height: 1.03;
  letter-spacing: -0.018em;
  margin: 1.2rem 0 0;
}

/* ---- Footer -------------------------------------------------------------- */
.site-foot {
  border-top: 1px solid var(--line);
  margin-top: 4rem;
}
.site-foot__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1.5rem 2rem;
  align-items: baseline;
  padding-block: 2.6rem 3.4rem;
  font-family: var(--mono);
  font-size: 0.76rem;
  color: var(--ink-faint);
}
.site-foot__inner a { color: var(--ink-soft); }
.site-foot__inner a:hover { color: var(--accent); }
.site-foot__links { display: flex; gap: 1.5rem; flex-wrap: wrap; }
.site-foot .credit { letter-spacing: 0.02em; }
.site-foot .credit .mark { color: var(--accent); }

/* ---- Load animation ------------------------------------------------------ */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(12px);
    animation: rise 0.8s var(--ease) forwards;
  }
  .reveal.d1 { animation-delay: 0.06s; }
  .reveal.d2 { animation-delay: 0.14s; }
  .reveal.d3 { animation-delay: 0.22s; }
  .reveal.d4 { animation-delay: 0.30s; }
  @keyframes rise {
    to { opacity: 1; transform: translateY(0); }
  }
}

/* ---- Responsive ---------------------------------------------------------- */
@media (max-width: 640px) {
  body { font-size: 1.06rem; }
  .nav { gap: 1.1rem; }
  .essay-row {
    grid-template-columns: 1fr;
    gap: 0.4rem;
    padding-block: 1.7rem;
  }
  .essay-row__no { padding-top: 0; }
  .essay-row__meta { text-align: left; padding-top: 0.6rem; }
  .hero::after { display: none; }
  .prose { font-size: 1.1rem; }
}