/* ==========================================================
   Peter Celona — portfolio
   Palette: drafting ink, blueprint, graphite, paper, pencil
   ========================================================== */

:root {
  --ink:      #14202b;
  --blue:     #24536f;
  --graphite: #5c6873;
  --paper:    #fcfbf8;
  --pencil:   #d4a017;
  --rule:     #ddd8cd;
  --rule-soft:#eceae3;

  --measure: 68ch;
  --gutter: clamp(1.25rem, 4vw, 4rem);

  --display: "Archivo", system-ui, sans-serif;
  --body:    "Source Serif 4", Georgia, serif;
  --mono:    "IBM Plex Mono", ui-monospace, monospace;
}

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: clamp(1.02rem, 0.4vw + 0.95rem, 1.15rem);
  line-height: 1.65;
  font-optical-sizing: auto;
}

/* ---------- shared type ---------- */

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.05;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0 0 1.15em; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}
a:hover { color: var(--ink); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 1px;
}

strong { font-weight: 600; }

em { font-style: italic; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--rule-soft);
  padding: 0.1em 0.35em;
  border-radius: 2px;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--graphite);
  margin: 0 0 1.4rem;
}

/* ---------- signature: drafting scale rule ---------- */
/* A carpenter's rule edge. Long tick every inch, short ticks between.
   Used as the connective tissue between every section of the site. */

.scale {
  height: 15px;
  border-top: 1.5px solid var(--ink);
  background-image:
    repeating-linear-gradient(to right, var(--blue) 0 1.5px, transparent 1.5px 56px),
    repeating-linear-gradient(to right, var(--graphite) 0 1px, transparent 1px 14px),
    repeating-linear-gradient(to right, var(--rule) 0 1px, transparent 1px 7px);
  background-size: 100% 13px, 100% 8px, 100% 4px;
  background-repeat: no-repeat;
  background-position: top left, top left, top left;
}

/* ---------- layout ---------- */

.wrap {
  max-width: 78rem;
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.band { padding-block: clamp(3rem, 6vw, 5rem); }

/* ---------- hero ---------- */

.hero { padding-block: clamp(3rem, 8vw, 6rem) clamp(2.5rem, 5vw, 4rem); }

.thesis {
  font-size: clamp(2.15rem, 6.2vw, 4.4rem);
  max-width: 24ch;
  margin-bottom: 2rem;
}

.thesis .mark {
  position: relative;
  white-space: nowrap;
}
.thesis .mark::after {
  content: "";
  position: absolute;
  left: -0.04em;
  right: -0.04em;
  bottom: 0.06em;
  height: 0.3em;
  background: var(--pencil);
  opacity: 0.45;
  z-index: -1;
}

.hero-lede {
  max-width: 52ch;
  font-size: 1.14em;
  color: var(--graphite);
}
.hero-lede strong { color: var(--ink); font-weight: 600; }

.identity {
  margin-top: 2.75rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--graphite);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
}
.identity .who {
  color: var(--ink);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- section heads ---------- */

.section-head {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  align-items: baseline;
  margin-bottom: 2.75rem;
}
.section-head h2 { font-size: clamp(1.35rem, 2.4vw, 1.85rem); }
.section-head .count {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--graphite);
}

/* ---------- work entries ---------- */

.entry {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 0 3.5rem;
  padding-block: 2.6rem;
  border-top: 1px solid var(--rule-soft);
}
.entry:first-of-type { border-top: 1px solid var(--rule); }

.entry-meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--graphite);
}
.entry-meta dt {
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.65rem;
  color: var(--blue);
  margin-top: 1.1rem;
}
.entry-meta dt:first-child { margin-top: 0; }
.entry-meta dd { margin: 0.1rem 0 0; color: var(--ink); }

.entry-body h3 {
  font-size: clamp(1.5rem, 3vw, 2.05rem);
  margin-bottom: 0.9rem;
}
.entry-body > p { max-width: var(--measure); }

.finding {
  margin: 1.5rem 0 1.35rem;
  padding-left: 1.1rem;
  border-left: 3px solid var(--pencil);
  font-family: var(--display);
  font-size: 1.06rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.45;
  max-width: 54ch;
}
.finding .caveat {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  color: var(--graphite);
  line-height: 1.6;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 1.6rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
}
.links a { text-decoration: none; border-bottom: 1px solid var(--rule); padding-bottom: 2px; }
.links a::before { content: "→ "; color: var(--pencil); }
.links a:hover { border-bottom-color: var(--blue); }

/* ---------- capability columns ---------- */

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr));
  gap: 2.5rem 3rem;
}
.cols h3 {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.85rem;
}
.cols ul {
  margin: 0; padding: 0; list-style: none;
  font-size: 0.95em;
  line-height: 1.75;
}
.cols li { border-bottom: 1px solid var(--rule-soft); padding: 0.35rem 0; }

/* ---------- closing ---------- */

.closing { background: var(--ink); color: var(--paper); }
.closing h2 { color: var(--paper); max-width: 30ch; font-size: clamp(1.6rem, 3.4vw, 2.4rem); }
.closing p { color: #b9c2c9; max-width: 48ch; margin-top: 1.25rem; }
.closing a { color: var(--pencil); }
.closing a:hover { color: var(--paper); }
.closing .identity { color: #8d99a3; }
.closing .identity .who { color: var(--paper); }

/* ==========================================================
   Case study pages
   ========================================================== */

.back {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--graphite);
  display: inline-block;
  padding-block: 2rem 0;
}
.back::before { content: "← "; }
.back:hover { color: var(--ink); }

.cs-head { padding-block: 2.5rem clamp(2.5rem, 6vw, 4rem); }
.cs-head h1 {
  font-size: clamp(2rem, 5.2vw, 3.4rem);
  max-width: 26ch;
  margin-bottom: 0.9rem;
}
.cs-head .sub {
  font-size: 1.14em;
  color: var(--graphite);
  max-width: 52ch;
  margin-bottom: 2.25rem;
}

.facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  gap: 1.5rem 2.5rem;
  margin: 0;
  font-family: var(--mono);
  font-size: 0.74rem;
  line-height: 1.65;
}
.facts dt {
  text-transform: uppercase;
  letter-spacing: 0.13em;
  font-size: 0.64rem;
  color: var(--blue);
  margin-bottom: 0.3rem;
}
.facts dd { margin: 0; color: var(--ink); }

/* stages — the derivation */

.stage { border-top: 1px solid var(--rule); padding-block: clamp(2.5rem, 5vw, 3.75rem); }

.stage-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.65rem;
}
.stage-label .n { color: var(--pencil); margin-right: 0.6em; }

.stage h2 {
  font-size: clamp(1.5rem, 3.2vw, 2.1rem);
  margin-bottom: 1.35rem;
  max-width: 30ch;
}

.stage > p,
.stage > ul,
.stage > .note { max-width: var(--measure); }

.stage h3 {
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.005em;
  margin: 1.9rem 0 0.6rem;
  max-width: var(--measure);
}

.stage ul { padding-left: 1.15rem; margin: 0 0 1.15em; }
.stage li { margin-bottom: 0.5rem; }

.note {
  border-left: 3px solid var(--pencil);
  padding: 0.15rem 0 0.15rem 1.1rem;
  margin: 1.6rem 0;
  color: var(--ink);
}
.note .label {
  display: block;
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--graphite);
  margin-bottom: 0.45rem;
}

.cs-foot { border-top: 1px solid var(--rule); padding-block: 2.5rem 4rem; }
.cs-foot .links { font-size: 0.78rem; }

/* ---------- responsive ---------- */

@media (max-width: 46rem) {
  /* title leads on mobile; metadata follows the pitch */
  .entry { display: flex; flex-direction: column; gap: 1.6rem; }
  .entry-body { order: 1; }
  .entry-meta {
    order: 2;
    display: grid;
    grid-template-columns: max-content 1fr;
    gap: 0.3rem 1.1rem;
    padding-top: 0.4rem;
    border-top: 1px solid var(--rule-soft);
  }
  .entry-meta dt { margin-top: 0; align-self: baseline; }
  .entry-meta dd { align-self: baseline; }
  .thesis { max-width: 18ch; }
  .facts { gap: 1.1rem 1.75rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* ---------- top nav ---------- */

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: clamp(2.5rem, 6vw, 4.5rem);
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
}
.topnav-name {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 500;
  color: var(--ink);
}
.topnav-links { display: flex; gap: 1.5rem; }
.topnav-links a {
  text-decoration: none;
  color: var(--graphite);
  padding-bottom: 3px;
  border-bottom: 1px solid transparent;
}
.topnav-links a:hover { color: var(--ink); border-bottom-color: var(--rule); }
.topnav-links a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--pencil);
}