/* ============================================================
   Keaton Zelazny — portfolio
   Palette: instrument paper, graphite ink, one plotted blue
   ============================================================ */

:root {
  --paper:  #F3F4F1;
  --panel:  #FBFBF9;
  --grid:   #E4E7E1;
  --rule:   #CBD1C9;
  --ink:    #14171A;
  --muted:  #646C6A;
  --trace:  #1B4DE4;
  --trace-soft: rgba(27, 77, 228, 0.10);

  --sans: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --cond: "IBM Plex Sans Condensed", "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --max: 1120px;
  --pad: 28px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 26px 26px;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

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

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

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 244, 241, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mark {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-decoration: none;
}

.mark .dot { color: var(--trace); }

.nav-links {
  display: flex;
  gap: 26px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.08em;
}

.nav-links a {
  text-decoration: none;
  color: var(--muted);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.nav-links a:hover,
.nav-links a:focus-visible { color: var(--ink); border-bottom-color: var(--trace); }

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

.hero { padding: 78px 0 44px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 20px;
}

h1 {
  font-family: var(--cond);
  font-weight: 700;
  font-size: clamp(3rem, 9vw, 6.4rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
}

.lede {
  font-size: clamp(1.05rem, 2.1vw, 1.32rem);
  line-height: 1.5;
  max-width: 40ch;
  margin: 0 0 30px;
  color: #23282B;
}

.lede em { font-style: normal; color: var(--trace); }

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 32px;
}

.facts span { white-space: nowrap; }

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

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  text-decoration: none;
  padding: 11px 20px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn:hover, .btn:focus-visible { background: var(--trace); border-color: var(--trace); }

.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn.ghost:hover, .btn.ghost:focus-visible { border-color: var(--trace); color: var(--trace); background: transparent; }

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

.trace-band {
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  background: var(--panel);
  margin-top: 52px;
  overflow: hidden;
}

.trace-band svg { display: block; width: 100%; height: 108px; }

.trace-band path {
  fill: none;
  stroke: var(--trace);
  stroke-width: 1.6;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 4200;
  stroke-dashoffset: 4200;
  animation: draw 2.6s cubic-bezier(0.4, 0, 0.2, 1) 0.25s forwards;
}

@keyframes draw { to { stroke-dashoffset: 0; } }

.trace-labels {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8px var(--pad) 12px;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- sections ---------- */

section { padding: 68px 0; }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 12px;
  margin-bottom: 30px;
}

h2 {
  font-family: var(--cond);
  font-weight: 700;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  margin: 0;
}

.sec-count {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  margin-left: auto;
}

/* ---------- filters ---------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.chip {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 7px 15px;
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.chip:hover { border-color: var(--ink); color: var(--ink); }

.chip[aria-pressed="true"] {
  background: var(--trace);
  border-color: var(--trace);
  color: #fff;
}

/* ---------- project grid ---------- */

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 18px;
}

.card {
  border: 1px solid var(--rule);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  transition: border-color 0.18s, transform 0.18s, box-shadow 0.18s;
}

.card:hover, .card:focus-visible {
  border-color: var(--trace);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(20, 23, 26, 0.07);
}

.card.hidden { display: none; }

.card-visual {
  border-bottom: 1px solid var(--rule);
  background: #fff;
  height: 132px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.card-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.card-visual svg { width: 78%; height: auto; }

.card-visual svg path,
.card-visual svg line,
.card-visual svg polyline {
  fill: none;
  stroke: var(--trace);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.card-visual svg .faint { stroke: var(--rule); stroke-width: 1.2; }

.card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }

.card-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  margin-bottom: 8px;
}

.card h3 {
  font-family: var(--cond);
  font-weight: 600;
  font-size: 1.2rem;
  line-height: 1.2;
  margin: 0 0 9px;
}

.card p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.55;
  color: #383E40;
}

.stack {
  margin-top: auto;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  letter-spacing: 0.03em;
}

.more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--trace);
  margin-top: 12px;
  letter-spacing: 0.05em;
}

/* ---------- about ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 52px;
}

.about-grid p { max-width: 62ch; margin: 0 0 16px; }

.side-block { border-left: 2px solid var(--trace); padding-left: 20px; }

.side-block h4 {
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 10px;
  font-weight: 500;
}

.side-block ul { margin: 0 0 26px; padding: 0; list-style: none; font-size: 14.5px; }
.side-block li { padding: 3px 0; }
.side-block li span { font-family: var(--mono); font-size: 12px; color: var(--muted); }

/* ---------- contact ---------- */

.contact-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 34px;
  font-family: var(--mono);
  font-size: 14px;
  margin-top: 6px;
}

.contact-links a {
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 3px;
  transition: border-color 0.15s, color 0.15s;
}

.contact-links a:hover, .contact-links a:focus-visible {
  color: var(--trace);
  border-bottom-color: var(--trace);
}

footer {
  border-top: 1px solid var(--rule);
  padding: 26px 0 40px;
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- project detail page ---------- */

.detail { padding: 60px 0 0; }

.back {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  text-decoration: none;
  letter-spacing: 0.06em;
}

.back:hover { color: var(--trace); }

.detail h1 { font-size: clamp(2.2rem, 5.5vw, 3.6rem); margin-top: 22px; }

.detail-meta {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 20px;
  margin-bottom: 40px;
}

.prose { max-width: 68ch; }
.prose h2 { font-size: 1.22rem; margin: 42px 0 12px; text-transform: none; letter-spacing: 0; }
.prose p { margin: 0 0 16px; }
.prose ul { margin: 0 0 16px; padding-left: 20px; }
.prose li { margin-bottom: 7px; }
.prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--trace-soft);
  padding: 1px 5px;
}

figure {
  margin: 30px 0;
  border: 1px solid var(--rule);
  background: var(--panel);
}

figure img { width: 100%; display: block; }

figure figcaption {
  font-family: var(--mono);
  font-size: 11.5px;
  color: var(--muted);
  padding: 10px 14px;
  border-top: 1px solid var(--rule);
}

.placeholder {
  height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
  background:
    repeating-linear-gradient(45deg, transparent, transparent 9px, var(--grid) 9px, var(--grid) 10px);
}

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

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .hero { padding: 50px 0 32px; }
  section { padding: 50px 0; }
  .nav-links { gap: 18px; }
  .trace-band svg { height: 84px; }
}

@media (max-width: 480px) {
  :root { --pad: 20px; }
  .grid { grid-template-columns: 1fr; }
  .nav-links { gap: 13px; font-size: 11.5px; letter-spacing: 0.04em; }
}

/* ---------- a11y ---------- */

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
  .trace-band path { stroke-dashoffset: 0; }
}