/* ==========================================================================
   Mark Harold Bien — Portfolio
   Design system: "Blueprint" — engineering drawing / PCB schematic aesthetic
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@400;500;600;700&family=Inter:wght@400;500;600&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  /* Color tokens */
  --bg: #0a1929;
  --bg-panel: #0f2439;
  --bg-panel-raised: #12293f;
  --line: #24405c;
  --line-soft: rgba(107, 140, 174, 0.25);
  --line-strong: rgba(45, 212, 191, 0.4);
  --ink: #e3f2f7;
  --ink-muted: #7d97ae;
  --ink-faint: #4f647a;
  --trace: #2dd4bf;
  --trace-bright: #6ee7d8;
  --copper: #d89b5d;

  /* Type */
  --font-display: 'Oswald', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --container: 1040px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background:
    linear-gradient(rgba(10,25,41,0.96), rgba(10,25,41,0.98)),
    repeating-linear-gradient(0deg, rgba(125,151,174,0.05) 0px, rgba(125,151,174,0.05) 1px, transparent 1px, transparent 40px),
    repeating-linear-gradient(90deg, rgba(125,151,174,0.05) 0px, rgba(125,151,174,0.05) 1px, transparent 1px, transparent 40px),
    var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--trace); text-decoration: none; }
a:hover { color: var(--trace-bright); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--trace); outline-offset: 3px; }

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

.wrap { max-width: var(--container); margin: 0 auto; padding: 0 28px; }

/* -------------------- Eyebrow / mono labels -------------------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--trace);
}
.eyebrow--muted { color: var(--ink-muted); }

/* -------------------- Header / Nav -------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 25, 41, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  max-width: var(--container);
  margin: 0 auto;
}
.nav-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
}
.nav-mark .node {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--trace);
  box-shadow: 0 0 0 3px rgba(45,212,191,0.18);
}
.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.05em;
}
.nav-links a {
  color: var(--ink-muted);
  padding: 8px 14px;
  border: 1px solid transparent;
  display: inline-block;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active {
  color: var(--trace);
  border: 1px solid var(--line-strong);
  background: rgba(45,212,191,0.06);
}
.nav-toggle {
  display: none;
  background: none; border: 1px solid var(--line-soft); color: var(--ink);
  font-family: var(--font-mono); font-size: 12px; padding: 8px 12px; cursor: pointer;
}

@media (max-width: 720px) {
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; gap: 0;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--line-soft);
    padding: 8px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .nav-toggle { display: block; }
}

/* -------------------- Dimension-line divider -------------------- */
.dim-divider {
  display: flex; align-items: center; gap: 14px;
  margin: 64px 0 40px;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
}
.dim-divider::before, .dim-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background:
    linear-gradient(90deg, var(--line-soft) 0 6px, transparent 6px),
    linear-gradient(90deg, transparent calc(100% - 6px), var(--line-soft) calc(100% - 6px));
  position: relative;
}
.dim-divider::before { border-left: 1px solid var(--line-soft); }
.dim-divider::after { border-right: 1px solid var(--line-soft); }

/* -------------------- Hero -------------------- */
.hero {
  padding: 96px 0 56px;
  position: relative;
}
.hero-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(40px, 6vw, 68px);
  line-height: 1.02;
  margin: 18px 0 10px;
  color: var(--ink);
  letter-spacing: 0.01em;
}
.hero-title .accent { color: var(--trace); }
.hero-role {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink-muted);
  margin: 0 0 28px;
  max-width: 640px;
}
.hero-lede {
  max-width: 620px;
  color: var(--ink-muted);
  font-size: 17px;
  margin-bottom: 8px;
}
.trace-rule {
  width: 64px; height: 2px;
  background: var(--trace);
  margin: 22px 0;
}

/* -------------------- Readout strip (stats) -------------------- */
.readout {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--line-soft);
  margin-top: 40px;
}
.readout-cell {
  padding: 20px 18px;
  border-right: 1px solid var(--line-soft);
}
.readout-cell:last-child { border-right: none; }
.readout-value {
  font-family: var(--font-mono);
  font-size: clamp(20px, 2.6vw, 28px);
  color: var(--trace);
  font-weight: 600;
}
.readout-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-top: 6px;
}
@media (max-width: 720px) {
  .readout { grid-template-columns: repeat(2, 1fr); }
  .readout-cell:nth-child(2) { border-right: none; }
}

/* -------------------- Section heading -------------------- */
.section-head { margin-bottom: 36px; }
.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 36px);
  margin: 8px 0 0;
  color: var(--ink);
}

/* -------------------- Schematic card (projects) -------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}
@media (max-width: 780px) { .card-grid { grid-template-columns: 1fr; } }

.schema-card {
  position: relative;
  border: 1px solid var(--line-soft);
  background: var(--bg-panel);
  padding: 26px;
}
.schema-card::before, .schema-card::after,
.schema-card .cnr-tl, .schema-card .cnr-br { content: none; }
.schema-card .corner {
  position: absolute; width: 12px; height: 12px;
  border-color: var(--trace); border-style: solid; border-width: 0;
}
.schema-card .corner.tl { top: -1px; left: -1px; border-top-width: 2px; border-left-width: 2px; }
.schema-card .corner.br { bottom: -1px; right: -1px; border-bottom-width: 2px; border-right-width: 2px; }

.schema-meta {
  display: flex; flex-wrap: wrap; gap: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.schema-meta b { color: var(--ink-muted); font-weight: 500; }

.schema-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 12px;
}
.schema-body { color: var(--ink-muted); font-size: 15px; margin-bottom: 14px; }
.schema-body strong { color: var(--ink); font-weight: 600; }

.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tag {
  font-family: var(--font-mono); font-size: 11px;
  border: 1px solid var(--line-soft); color: var(--ink-muted);
  padding: 3px 9px;
}

.proof-line {
  display: flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12.5px;
  color: var(--copper);
  border-top: 1px solid var(--line-soft);
  padding-top: 12px; margin-top: 4px;
}
.proof-line::before { content: "▸"; }

/* -------------------- Placeholder image box -------------------- */
.img-placeholder {
  border: 1px dashed var(--line-strong);
  background: repeating-linear-gradient(135deg, rgba(45,212,191,0.05) 0 10px, transparent 10px 20px);
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 14px;
  min-height: 160px;
  margin-bottom: 16px;
}

/* Video embed placeholder — same visual language, sized for 16:9 */
.video-placeholder {
  border: 1px dashed var(--line-strong);
  background: repeating-linear-gradient(135deg, rgba(45,212,191,0.05) 0 10px, transparent 10px 20px);
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: flex; align-items: center; justify-content: center;
  text-align: center;
  padding: 14px;
  aspect-ratio: 16 / 9;
  margin-bottom: 16px;
}

/* Placeholder link — visibly marked as "fill me in" without looking broken */
.link-placeholder {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--copper);
  border-bottom: 1px dashed var(--copper);
}
.link-placeholder:hover { color: var(--trace-bright); border-bottom-color: var(--trace-bright); }

/* -------------------- Buttons / links -------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 13px;
  letter-spacing: 0.04em;
  padding: 11px 20px;
  border: 1px solid var(--trace);
  color: var(--trace);
  background: transparent;
  cursor: pointer;
}
.btn:hover { background: rgba(45,212,191,0.08); color: var(--trace-bright); }
.btn--solid { background: var(--trace); color: #06201c; border-color: var(--trace); }
.btn--solid:hover { background: var(--trace-bright); color: #06201c; }

.link-arrow::after { content: " →"; }

/* -------------------- Timeline (About) -------------------- */
.timeline { position: relative; padding-left: 34px; }
.timeline::before {
  content: ""; position: absolute; left: 5px; top: 6px; bottom: 6px;
  width: 1px; background: var(--line-soft);
}
.timeline-item { position: relative; margin-bottom: 30px; }
.timeline-item::before {
  content: ""; position: absolute; left: -34px; top: 4px;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--trace);
}
.timeline-num {
  font-family: var(--font-mono); font-size: 11px; color: var(--ink-faint);
}
.timeline-title { font-family: var(--font-display); font-size: 19px; color: var(--ink); margin: 4px 0; }
.timeline-body { color: var(--ink-muted); font-size: 14.5px; }

/* -------------------- Generic content blocks -------------------- */
.prose { color: var(--ink-muted); font-size: 16px; max-width: 720px; }
.prose strong { color: var(--ink); }
.prose p { margin-bottom: 16px; }

.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
@media (max-width: 780px) { .two-col { grid-template-columns: 1fr; } }

.chip-list { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  font-family: var(--font-mono); font-size: 12.5px;
  border: 1px solid var(--line-soft); padding: 7px 13px;
  color: var(--ink-muted);
}
a.chip.link-placeholder {
  color: var(--copper);
  border-color: var(--copper);
  border-style: dashed;
}
a.chip.link-placeholder:hover { color: var(--trace-bright); border-color: var(--trace-bright); }

/* -------------------- Footer (title block) -------------------- */
.site-footer {
  margin-top: 100px;
  border-top: 1px solid var(--line-soft);
  padding: 26px 0 40px;
}
.footer-grid {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 14px;
  font-family: var(--font-mono); font-size: 12px; color: var(--ink-faint);
}
.footer-grid a { color: var(--ink-muted); }
.footer-grid a:hover { color: var(--trace); }
.footer-label { color: var(--ink-faint); }

section { padding: 8px 0; }