/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  --bg: #EDEEF0;
  --bg-panel: #FFFFFF;
  --bg-panel-alt: #F5F6F7;
  --ink: #15181C;
  --ink-soft: #545B64;
  --ink-faint: #8A9098;
  --line: #CBD2D9;
  --line-soft: #DCE1E6;
  --accent: #E8571B;
  --accent-soft: #FBE4D9;
  --signal: #1F4E8C;
  --signal-soft: #DCE6F2;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --rail-width: 64px;
  --content-max: 860px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

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

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

/* ============================================
   BACKGROUND GRID (blueprint feel)
   ============================================ */
.grid-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  mask-image: linear-gradient(to bottom, black, black 60%, transparent 100%);
}

/* ============================================
   SIGNAL RAIL (left margin trace)
   ============================================ */
.signal-rail {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: var(--rail-width);
  z-index: 1;
  display: none;
}

@media (min-width: 900px) {
  .signal-rail { display: block; }
}

.signal-rail svg {
  height: 100%;
  width: 100%;
}

.rail-line {
  stroke: var(--line);
  stroke-width: 1.5;
  fill: none;
}

.rail-node {
  fill: var(--bg);
  stroke: var(--signal);
  stroke-width: 2;
}

.rail-node.active {
  fill: var(--accent);
  stroke: var(--accent);
}

/* ============================================
   LAYOUT SHELL
   ============================================ */
.shell {
  position: relative;
  z-index: 2;
  margin-left: 0;
}

@media (min-width: 900px) {
  .shell { margin-left: var(--rail-width); }
}

.wrap {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(237, 238, 240, 0.88);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 14px;
  padding-bottom: 14px;
}

.brand {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.brand .brand-tick {
  color: var(--accent);
}

.nav-links {
  display: none;
  gap: 28px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  padding-bottom: 2px;
  transition: color 0.15s ease;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--ink);
}

.nav-links a.active {
  border-bottom: 2px solid var(--accent);
}

@media (min-width: 700px) {
  .nav-links { display: flex; align-items: center; }
}

.nav-toggle {
  display: inline-flex;
  background: none;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 7px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  cursor: pointer;
  color: var(--ink);
}

@media (min-width: 700px) {
  .nav-toggle { display: none; }
}

.mobile-nav {
  display: none;
  flex-direction: column;
  gap: 2px;
  padding: 4px 24px 16px;
  font-family: var(--font-mono);
  font-size: 14px;
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  text-decoration: none;
  color: var(--ink-soft);
  padding: 10px 0;
  border-bottom: 1px solid var(--line-soft);
}

@media (min-width: 700px) {
  .mobile-nav { display: none !important; }
}

/* ============================================
   HERO
   ============================================ */
.hero {
  position: relative;
  padding: 72px 0 56px;
}

.reticle {
  position: absolute;
  width: 22px;
  height: 22px;
  z-index: 1;
}

.reticle svg { width: 100%; height: 100%; }
.reticle-tl { top: 8px; left: 0; }
.reticle-tr { top: 8px; right: 0; transform: scaleX(-1); }
.reticle-bl { bottom: -4px; left: 0; transform: scaleY(-1); }
.reticle-br { bottom: -4px; right: 0; transform: scale(-1, -1); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--signal);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 18px;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  line-height: 1.02;
  margin: 0 0 20px;
  letter-spacing: -0.01em;
}

.hero .pitch {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 0 32px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 44px;
}

.btn {
  font-family: var(--font-mono);
  font-size: 13px;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 4px;
  border: 1px solid var(--line);
  color: var(--ink);
  transition: border-color 0.15s ease, background 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

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

.btn.primary {
  background: var(--ink);
  color: var(--bg-panel);
  border-color: var(--ink);
}

.btn.primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* Title block, like an engineering drawing title block */
.title-block {
  border: 1px solid var(--line);
  background: var(--bg-panel);
  border-radius: 6px;
  overflow: hidden;
}

.title-block-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}

@media (min-width: 640px) {
  .title-block-grid { grid-template-columns: repeat(4, 1fr); }
}

.title-block-cell {
  padding: 14px 18px;
  border-right: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.title-block-cell:last-child { border-right: none; }

.title-block-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 4px;
}

.title-block-value {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--ink);
}

.title-block-value a {
  text-decoration: none;
  color: var(--signal);
}

.title-block-value a:hover { text-decoration: underline; }

/* ============================================
   SECTION HEADERS
   ============================================ */
.section {
  padding: 64px 0;
  position: relative;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 36px;
}

.section-id {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin: 0;
}

.section-rule {
  flex: 1;
  height: 1px;
  background: var(--line);
}

/* ============================================
   PROJECT CARD ("spec plate")
   ============================================ */
.project {
  background: var(--bg-panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  margin-bottom: 28px;
  overflow: hidden;
  scroll-margin-top: 90px;
}

.project-plate {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: 22px 26px;
  border-bottom: 1px solid var(--line-soft);
  background: var(--bg-panel-alt);
}

.project-plate-id {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  margin-bottom: 6px;
}

.project-plate h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 8px;
}

.project-blurb {
  color: var(--ink-soft);
  font-size: 0.98rem;
  max-width: 520px;
  margin: 0;
}

.project-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex-shrink: 0;
}

.project-links a {
  font-family: var(--font-mono);
  font-size: 12px;
  text-decoration: none;
  color: var(--signal);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 6px;
}

.project-links a:hover { text-decoration: underline; }

.project-links a.disabled {
  color: var(--ink-faint);
  cursor: default;
  pointer-events: none;
}

.project-body {
  padding: 24px 26px 28px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tag-pin {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 4px 9px;
  background: var(--bg-panel);
  position: relative;
  padding-left: 16px;
}

.tag-pin::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--signal);
}

.project-block {
  margin-bottom: 20px;
}

.project-block:last-child { margin-bottom: 0; }

.project-block-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.project-block p {
  margin: 0;
  color: var(--ink);
  font-size: 0.96rem;
}

.project-block ul {
  margin: 8px 0 0;
  padding-left: 20px;
}

.project-block li {
  margin-bottom: 6px;
  font-size: 0.94rem;
}

.project-block li strong {
  font-weight: 600;
}

.placeholder-text {
  color: var(--ink-faint);
  font-style: italic;
}

.results-line {
  background: var(--signal-soft);
  border-left: 3px solid var(--signal);
  padding: 12px 16px;
  border-radius: 0 4px 4px 0;
  font-size: 0.95rem;
}

.contribution-line {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--ink-soft);
  background: var(--bg-panel-alt);
  border: 1px dashed var(--line);
  border-radius: 4px;
  padding: 10px 14px;
}

/* Labs list, collapsible */
details.labs {
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

details.labs summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

details.labs summary::-webkit-details-marker { display: none; }

details.labs summary::before {
  content: "+";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 12px;
  color: var(--ink);
  flex-shrink: 0;
}

details.labs[open] summary::before {
  content: "\2212";
}

.labs-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 14px;
}

.labs-grid span {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-soft);
  background: var(--bg-panel-alt);
  border: 1px solid var(--line-soft);
  padding: 5px 10px;
  border-radius: 3px;
}

/* ============================================
   ABOUT / CONTACT
   ============================================ */
.about-text {
  max-width: 620px;
  color: var(--ink-soft);
  font-size: 1rem;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.contact-card {
  border: 1px solid var(--line);
  background: var(--bg-panel);
  border-radius: 6px;
  padding: 16px 18px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s ease;
}

.contact-card:hover { border-color: var(--accent); }

.contact-card .label {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  margin-bottom: 6px;
}

.contact-card .value {
  font-family: var(--font-mono);
  font-size: 13.5px;
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px 0 48px;
  margin-top: 20px;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--ink-faint);
}