/* ==========================================================
   Personal website — black / electric blue / white
   Edit colours in :root, edit text in index.html
   ========================================================== */

:root {
  --bg: #08090f;
  --surface: #10131c;
  --fg: #f7f8fa;
  --muted: #9aa4b8;
  --border: #262c3b;
  --blue: #1f6bff;
  --blue-glow: #5b8def;
  --radius: 8px;
  --shadow-hard: 0 6px 20px rgba(31, 107, 255, 0.25);
  --font-display: "Archivo Black", system-ui, sans-serif;
  --font-sans: "Barlow", system-ui, sans-serif;
  --font-mono: "Space Mono", ui-monospace, monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

::selection {
  background: var(--blue);
  color: #fff;
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  text-transform: uppercase;
  line-height: 1;
}

a {
  color: inherit;
  text-decoration: none;
}

.wrap {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: rgba(8, 9, 15, 0.85);
  backdrop-filter: blur(8px);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}
.logo {
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 18px;
}
.logo span {
  color: var(--blue-glow);
}
.site-nav a {
  padding: 8px 12px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  transition: color 0.18s ease;
}
.site-nav a:hover {
  color: var(--blue-glow);
}

/* ---------- shared bits ---------- */
.tag {
  display: inline-block;
  background: var(--blue);
  color: #fff;
  padding: 4px 14px;
  border-radius: 999px;
  font-family: var(--font-display);
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.2em;
}

.slab {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(16, 19, 28, 0.88);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}
.slab:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
  border-color: var(--blue);
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition:
    transform 0.18s ease,
    box-shadow 0.18s ease,
    border-color 0.18s ease;
}
.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hard);
  border-color: var(--blue);
}
.btn-primary {
  background: var(--blue);
  border-color: var(--blue);
}

.section {
  padding: 96px 0;
}
.section-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--blue-glow);
}
.section-title {
  font-size: clamp(2.2rem, 5vw, 3rem);
  margin-top: 8px;
}
.rule {
  height: 3px;
  width: 72px;
  background: var(--blue);
  margin-top: 16px;
}
.center {
  text-align: center;
}
.center .rule {
  margin-left: auto;
  margin-right: auto;
}

/* ---------- hero ---------- */
.hero {
  border-bottom: 1px solid var(--border);
  background-image:
    linear-gradient(rgba(31, 107, 255, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(31, 107, 255, 0.06) 1px, transparent 1px);
  background-size: 56px 56px;
}
.hero .wrap {
  padding-top: 120px;
  padding-bottom: 120px;
}
.hero h1 {
  font-size: clamp(3rem, 11vw, 7rem);
  line-height: 0.92;
  margin-top: 24px;
}
.hero h1 .outline {
  display: block;
  color: transparent;
  -webkit-text-stroke: 2px var(--fg);
}
.hero p.lede {
  margin-top: 32px;
  max-width: 34rem;
  font-size: 19px;
  color: var(--muted);
}
.hero .actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 40px;
}
.meta {
  margin-top: 40px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- about ---------- */
.about-grid {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}
.about-text p + p {
  margin-top: 20px;
}
.about-text p {
  color: var(--muted);
  font-size: 18px;
}
.facts {
  list-style: none;
  display: grid;
  gap: 12px;
}
.facts li {
  padding: 16px;
}
.facts .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue-glow);
}
.facts .v {
  font-weight: 600;
  margin-top: 4px;
}

/* ---------- research ---------- */
.research-update + .research-update {
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--border);
}
.research-update-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--fg);
  font-weight: 700;
}
.research-intro {
  margin-top: 24px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.qa-list {
  display: grid;
  gap: 20px;
  margin-top: 32px;
}
.qa-item {
  padding: 28px 32px;
}
.qa-q {
  font-weight: 700;
  font-size: 17px;
}
.qa-num {
  display: inline-block;
  margin-right: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--blue-glow);
}
.qa-a {
  margin-top: 14px;
  color: var(--muted);
  font-size: 16px;
}
.sources {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}
.sources .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--blue-glow);
}
.sources ul {
  list-style: none;
  margin-top: 12px;
  display: grid;
  gap: 8px;
}
.sources a {
  font-size: 15px;
  color: var(--fg);
  border-bottom: 1px solid var(--border);
  transition: border-color 0.18s ease, color 0.18s ease;
}
.sources a:hover {
  color: var(--blue-glow);
  border-color: var(--blue);
}

/* ---------- contact ---------- */
.contact {
  border-top: 1px solid var(--border);
}
.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 40px;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- responsive ---------- */
@media (min-width: 760px) {
  .about-grid {
    grid-template-columns: 1.4fr 1fr;
  }
}

@media (max-width: 620px) {
  .site-nav a {
    padding: 8px 6px;
    font-size: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}