/* System Sciences — hand-rolled static site, no framework, no JavaScript, no third-party requests */

:root {
  --ink: #131a29;
  --ink-soft: #45536e;
  --ink-faint: #707d96;
  --paper: #ffffff;
  --paper-tint: #f4f6fa;
  --line: #dfe5ef;
  --navy: #0e1b30;
  --navy-2: #16283f;
  --accent: #2563eb;
  --accent-ink: #1d4fd7;
  --accent-soft: #e6edfd;
  --glow: #5b9bff;
  --amber: #f59e0b;
  --radius: 16px;
  --maxw: 68rem;
  --shadow-1: 0 1px 2px rgba(15, 27, 48, 0.06), 0 4px 14px rgba(15, 27, 48, 0.05);
  --shadow-2: 0 6px 18px rgba(15, 27, 48, 0.10), 0 18px 44px rgba(15, 27, 48, 0.10);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(circle at 1px 1px, rgba(19, 26, 41, 0.028) 1px, transparent 0) 0 0 / 22px 22px,
    var(--paper);
  line-height: 1.65;
  font-size: 1.0625rem;
  -webkit-font-smoothing: antialiased;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

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

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

.container {
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

main { min-height: 60vh; }

section { padding-block: 3.75rem; }

.grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 48rem) {
  .grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
  .grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px) saturate(1.4);
  -webkit-backdrop-filter: blur(12px) saturate(1.4);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 1px 0 rgba(15, 27, 48, 0.02), 0 6px 24px rgba(15, 27, 48, 0.04);
}

.site-header .container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-block: 0.75rem;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.logo svg {
  display: block;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(16, 35, 63, 0.28);
}

.logo-name {
  font-weight: 800;
  letter-spacing: 0.14em;
  font-size: 0.95rem;
  text-transform: uppercase;
}

.logo-name small {
  display: block;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: none;
  color: var(--ink-faint);
  font-size: 0.72rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.4rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border-bottom: none;
  transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover { color: var(--ink); background: var(--paper-tint); }

.site-nav a[aria-current="page"] {
  color: var(--accent-ink);
  background: var(--accent-soft);
}

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

.hero {
  position: relative;
  overflow: clip;
  background:
    radial-gradient(1100px 500px at 85% -10%, rgba(37, 99, 235, 0.35), transparent 60%),
    radial-gradient(800px 400px at -10% 110%, rgba(245, 158, 11, 0.12), transparent 55%),
    linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #eef3fb;
  padding-block: 5.5rem;
}

/* engineering dot grid over the hero */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(143, 163, 194, 0.16) 1px, transparent 0);
  background-size: 26px 26px;
  mask-image: radial-gradient(60% 70% at 70% 30%, black, transparent 100%);
  -webkit-mask-image: radial-gradient(60% 70% at 70% 30%, black, transparent 100%);
  pointer-events: none;
}

.hero .container { position: relative; }

.hero .eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--amber);
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.4);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  margin-bottom: 1.3rem;
}

.hero .eyebrow::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--amber);
  box-shadow: 0 0 10px var(--amber);
  animation: pulse 2.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero h1 {
  font-size: clamp(2.1rem, 5vw, 3.35rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 1.1rem;
  max-width: 22ch;
  color: #ffffff;
}

.hero h1 .hl {
  background: linear-gradient(92deg, var(--glow) 0%, #9cc4ff 55%, var(--amber) 120%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p.lede {
  font-size: 1.2rem;
  color: #b9c7dd;
  max-width: 56ch;
  margin: 0 0 2.1rem;
}

.hero-figure {
  position: relative;
  background: rgba(9, 16, 29, 0.65);
  border: 1px solid rgba(91, 155, 255, 0.25);
  border-radius: var(--radius);
  padding: 1rem 1.1rem 0.4rem;
  box-shadow: 0 20px 50px rgba(2, 8, 20, 0.55), inset 0 1px 0 rgba(143, 163, 194, 0.15);
  animation: float 7s ease-in-out infinite;
}

/* amber corner ticks — drafting-table flavor */
.hero-figure::before,
.hero-figure::after {
  content: "";
  position: absolute;
  width: 18px;
  height: 18px;
  border-color: rgba(245, 158, 11, 0.75);
  border-style: solid;
}

.hero-figure::before {
  top: -6px; left: -6px;
  border-width: 2px 0 0 2px;
  border-top-left-radius: 8px;
}

.hero-figure::after {
  bottom: -6px; right: -6px;
  border-width: 0 2px 2px 0;
  border-bottom-right-radius: 8px;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-7px); }
}

.hero-figure figcaption {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: #8fa3c2;
  padding-block: 0.5rem 0.4rem;
  border-top: 1px dashed rgba(143, 163, 194, 0.35);
  margin-top: 0.4rem;
}

.hero .btn-primary {
  background: linear-gradient(180deg, #3b76f0, var(--accent));
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.hero .btn-primary:hover { background: linear-gradient(180deg, #2f66db, var(--accent-ink)); }

.hero .btn-ghost {
  color: #eef3fb;
  border-color: rgba(238, 243, 251, 0.4);
}

.hero .btn-ghost:hover { background: rgba(238, 243, 251, 0.1); }

@media (min-width: 56rem) {
  .hero .container {
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 3rem;
    align-items: center;
  }
}

/* ---------- typography ---------- */

h2 {
  font-size: clamp(1.45rem, 2.6vw, 1.85rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 0.5rem;
}

h3 { font-size: 1.15rem; margin: 0 0 0.4rem; letter-spacing: -0.01em; }

.section-lede {
  color: var(--ink-soft);
  max-width: 62ch;
  margin-top: 0.3rem;
}

.kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-ink);
  margin: 0 0 0.6rem;
}

.kicker::before {
  content: "";
  width: 26px;
  height: 2px;
  background: linear-gradient(90deg, var(--amber), transparent);
  border-radius: 2px;
}

a { color: var(--accent-ink); }

/* ---------- cards ---------- */

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.5rem 1.3rem;
  box-shadow: var(--shadow-1);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: #c4d3f2;
  box-shadow: var(--shadow-2);
}

.card h3 { display: flex; align-items: center; gap: 0.55rem; }

.card .icon {
  flex: none;
  width: 2.15rem;
  height: 2.15rem;
  border-radius: 10px;
  display: inline-grid;
  place-items: center;
  background: linear-gradient(145deg, var(--accent-soft), #d7e3fc);
  border: 1px solid #cddcf9;
  color: var(--accent-ink);
  box-shadow: inset 0 1px 0 #fff;
}

.card p { margin: 0.2rem 0 0; color: var(--ink-soft); font-size: 0.98rem; }

.card.tint { background: var(--paper-tint); }

.card.tint:hover { background: #eef2f9; }

/* ---------- lists ---------- */

.checklist {
  list-style: none;
  padding: 0;
  margin: 1rem 0 0;
  display: grid;
  gap: 0.55rem;
}

.checklist li {
  padding-left: 1.7rem;
  position: relative;
  color: var(--ink-soft);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 2px;
  background: linear-gradient(145deg, var(--accent), var(--accent-ink));
  transform: rotate(45deg);
  box-shadow: 0 1px 3px rgba(37, 99, 235, 0.4);
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  padding: 0;
  margin: 1.4rem 0 0;
}

.tags li {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  background: var(--paper);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  box-shadow: var(--shadow-1);
  transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.tags li:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  color: var(--accent-ink);
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: 12px;
  padding: 0.72rem 1.45rem;
  transition: background 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
}

.btn::after {
  content: "→";
  font-weight: 600;
  transition: transform 0.15s ease;
}

.btn:hover::after { transform: translateX(3px); }

.btn:active { transform: translateY(1px); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
}

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

.btn-ghost {
  color: var(--accent-ink);
  border: 1.5px solid var(--accent);
  margin-left: 0.6rem;
}

.btn-ghost:hover { background: var(--accent-soft); }

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

.tint-band {
  background:
    linear-gradient(180deg, rgba(37, 99, 235, 0.035), transparent 40%),
    var(--paper-tint);
  border-block: 1px solid var(--line);
}

.pull {
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--ink);
  max-width: 58ch;
  border-left: 4px solid var(--accent);
  border-image: linear-gradient(180deg, var(--amber), var(--accent)) 1;
  padding-left: 1.2rem;
  margin: 1.5rem 0;
}

/* ---------- stats strip ---------- */

.stats {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(11rem, 1fr));
  margin-top: 2rem;
}

.stat {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.2rem 1rem;
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.stat::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--amber), var(--accent));
}

.stat strong {
  display: block;
  font-size: 1.55rem;
  letter-spacing: -0.015em;
  background: linear-gradient(120deg, var(--accent-ink), var(--accent) 70%, #6ea0ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.stat span { font-size: 0.9rem; color: var(--ink-faint); }

/* ---------- about: portrait ---------- */

.person {
  display: grid;
  gap: 1.8rem;
  align-items: center;
  margin-top: 2rem;
}

@media (min-width: 42rem) {
  .person { grid-template-columns: minmax(10rem, 14rem) 1fr; }
}

.portrait {
  position: relative;
  aspect-ratio: 4 / 5;
  border-radius: var(--radius);
  background:
    radial-gradient(120% 90% at 20% 0%, rgba(91, 155, 255, 0.25), transparent 55%),
    linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 100%);
  border: 1px solid #24354f;
  box-shadow: var(--shadow-2);
  display: grid;
  place-items: center;
  overflow: hidden;
}

.portrait img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portrait .monogram {
  font-weight: 800;
  font-size: 3.4rem;
  letter-spacing: 0.06em;
  color: transparent;
  background: linear-gradient(140deg, var(--glow), #9cc4ff 60%, var(--amber));
  -webkit-background-clip: text;
  background-clip: text;
}

.portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(143, 163, 194, 0.18) 1px, transparent 0);
  background-size: 20px 20px;
  pointer-events: none;
}

.portrait:has(img)::after { display: none; }

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

.contact-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.7rem;
  background: var(--paper);
  box-shadow: var(--shadow-1);
}

.contact-card dl { margin: 0; }

.contact-card dt {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 1.1rem;
}

.contact-card dt:first-child { margin-top: 0; }

.contact-card dd { margin: 0.15rem 0 0; }

.contact-card dd a {
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--accent-soft);
}

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

/* ---------- footer ---------- */

.site-footer {
  position: relative;
  background:
    radial-gradient(900px 300px at 110% 0%, rgba(37, 99, 235, 0.25), transparent 60%),
    linear-gradient(165deg, var(--navy) 0%, var(--navy-2) 100%);
  color: #8fa3c2;
  padding-block: 2.6rem;
  margin-top: 3rem;
  font-size: 0.92rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem 2rem;
  justify-content: space-between;
  align-items: baseline;
}

.site-footer nav { display: flex; flex-wrap: wrap; gap: 1.2rem; }

.site-footer a { color: #c3d1e6; text-decoration: none; }

.site-footer a:hover { color: #ffffff; text-decoration: underline; }

/* ---------- legal pages ---------- */

.legal h2 { margin-top: 2rem; }
.legal h2:first-of-type { margin-top: 0; }
.legal p { color: var(--ink-soft); max-width: 72ch; }