/* =========================================================
   David Stanley — personal site
   Cool editorial / refined-academic. Blues sampled from the
   portrait backdrop. Schibsted Grotesk + IBM Plex Sans/Mono.
   ========================================================= */

:root {
  /* palette — cool, harmonized with the photo's blue backdrop */
  --paper:      #eef1f5;   /* cool off-white canvas */
  --paper-2:    #e2e7ee;   /* alternate section background */
  --ink:        #161a20;   /* blue-charcoal text / dark bands */
  --ink-soft:   #434a54;   /* secondary text */
  --ink-faint:  #7c828c;   /* muted — safe only on the dark --ink background */
  --line:       #d3d9e0;   /* cool hairline dividers */
  --accent:     #2f5180;   /* deep slate blue (photo edge) — WCAG AA text on paper/paper-2 */
  --accent-bright: #5283b0;/* azure (visible backdrop blue) — large/non-text + dark bg */
  --accent-2:   #2c3e50;   /* deep slate — course tags */
  --paper-rgb:  238, 241, 245;

  /* type */
  --display: "Schibsted Grotesk", system-ui, sans-serif;
  --sans:    "IBM Plex Sans", system-ui, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, monospace;

  /* metrics */
  --maxw: 1180px;
  --gutter: clamp(1.25rem, 5vw, 5rem);
  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; }

/* film grain / paper texture overlay */
.grain {
  position: fixed;
  inset: 0;
  z-index: 9999;
  pointer-events: none;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ----------------------------------------------------- NAV */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem var(--gutter);
  background: rgba(var(--paper-rgb), 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav__mark {
  font-family: var(--display);
  font-weight: 600;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.nav__mark span { color: var(--accent); }

.nav__links {
  display: flex;
  gap: clamp(0.9rem, 2.2vw, 2rem);
}
.nav__links a {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink-soft);
  position: relative;
  padding: 0.2rem 0;
  transition: color 0.25s var(--ease);
}
.nav__links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 1.5px;
  background: var(--accent);
  transition: width 0.3s var(--ease);
}
.nav__links a:hover { color: var(--ink); }
.nav__links a:hover::after { width: 100%; }

.nav__cta {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--accent);
  white-space: nowrap;
}
.nav__cta:hover { text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 720px) {
  .nav__links { display: none; }
}

/* --------------------------------------------------- HERO */
.hero {
  padding: clamp(3rem, 9vw, 7.5rem) var(--gutter) clamp(2rem, 5vw, 3.5rem);
  max-width: var(--maxw);
  margin: 0 auto;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.55fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.4rem;
}

.hero__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  line-height: 1.0;
  text-wrap: balance;
  letter-spacing: -0.02em;
  margin: 0 0 1.6rem;
}

.hero__role {
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--ink-soft);
  margin: 0 0 2.2rem;
  max-width: 30ch;
}
.hero__inst { color: var(--ink); font-weight: 600; }

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding: 0.7rem 1.25rem;
  border: 1.5px solid var(--ink);
  border-radius: 2rem;
  color: var(--ink);
  background: transparent;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), color 0.25s var(--ease);
}
.btn:hover { transform: translateY(-2px); background: var(--ink); color: var(--paper); }
.btn--solid { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn--solid:hover { background: var(--ink); border-color: var(--ink); }

/* portrait */
.hero__portrait { justify-self: center; }
.portrait {
  margin: 0;
  position: relative;
  width: clamp(200px, 26vw, 300px);
  aspect-ratio: 4 / 5;
  border-radius: 4px;
  overflow: hidden;
  background: linear-gradient(150deg, var(--paper-2), #d4dbe4);
  border: 1px solid var(--line);
  box-shadow: 18px 18px 0 -4px var(--ink), 18px 18px 0 -3px var(--ink);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; display: block; }
.portrait__mono {
  display: none;
  position: absolute;
  inset: 0;
  align-items: center;
  justify-content: center;
  font-family: var(--display);
  font-weight: 500;
  font-size: 4rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.portrait--empty .portrait__mono { display: flex; }
.portrait__cap {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  text-align: center;
  margin: 1.4rem 0 0;
}

/* ticker */
.hero__ticker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  align-items: center;
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.hero__ticker span:nth-child(even) { color: var(--accent); }

@media (max-width: 760px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__portrait { justify-self: start; order: -1; }
  .portrait { width: clamp(150px, 42vw, 220px); box-shadow: 12px 12px 0 -3px var(--ink), 12px 12px 0 -2px var(--ink); }
}

/* ------------------------------------------------ SECTIONS */
.section {
  padding: clamp(3.5rem, 9vw, 7rem) var(--gutter);
}
.section--alt { background: var(--paper-2); }

.section__head {
  max-width: var(--maxw);
  margin: 0 auto 2.6rem;
  display: flex;
  align-items: baseline;
  gap: 1.2rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: 1.1rem;
}
.section__num {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.section__title {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.6rem, 4.2vw, 2.5rem);
  letter-spacing: -0.02em;
  margin: 0;
}
.section__body { max-width: var(--maxw); margin: 0 auto; }

.lead {
  font-family: var(--sans);
  font-weight: 500;
  font-size: clamp(1.2rem, 2.4vw, 1.55rem);
  line-height: 1.5;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin: 0 0 1.6rem;
  max-width: 40ch;
}

.about { max-width: 62ch; }
.about p { color: var(--ink-soft); }
.about .lead { color: var(--ink); }

/* research cards */
.cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem;
}
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1.8rem;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}
.section--alt .card { background: var(--paper); }
.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 14px 30px -18px rgba(22,26,32,0.5);
}
.card__tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.card h3 {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  margin: 0.7rem 0 0.6rem;
}
.card p { margin: 0; color: var(--ink-soft); font-size: 0.97rem; }

@media (max-width: 640px) { .cards { grid-template-columns: 1fr; } }

/* -------------------------------------------------- METRICS */
.metrics {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(3rem, 7vw, 5rem) var(--gutter);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  position: relative;
}
.metrics::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle at 1px 1px, rgba(238,241,245,0.10) 1px, transparent 0);
  background-size: 22px 22px;
  pointer-events: none;
}
.metric {
  text-align: center;
  position: relative;
  z-index: 1;
}
.metric__num {
  display: block;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.8rem, 8vw, 5rem);
  line-height: 1;
  letter-spacing: -0.03em;
}
.metric__plus { color: var(--accent-bright); }
.metric__label {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.7rem;
  display: inline-block;
}
.metrics__src {
  grid-column: 1 / -1;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  margin: 1rem 0 0;
  z-index: 1;
}
.metrics__src a { color: var(--paper); text-underline-offset: 3px; }

@media (max-width: 640px) {
  .metrics { grid-template-columns: 1fr; gap: 2.4rem; }
}

/* ----------------------------------------------- PUBLICATIONS */
.pubs { list-style: none; margin: 0; padding: 0; }
.pub {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  align-items: baseline;
}
.pub:last-of-type { border-bottom: 1px solid var(--line); }
.pub__year {
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--accent);
  font-weight: 500;
}
.pub__title {
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.4;
  letter-spacing: -0.005em;
  margin: 0 0 0.45rem;
}
.pub__meta { margin: 0; font-size: 0.92rem; color: var(--ink-soft); }
.pub:hover .pub__title { color: var(--accent); transition: color 0.25s var(--ease); }

.more {
  display: inline-block;
  margin-top: 1.8rem;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--accent);
  border-bottom: 1.5px solid transparent;
  transition: border-color 0.25s var(--ease);
}
.more:hover { border-color: var(--accent); }

@media (max-width: 540px) {
  .pub { grid-template-columns: 1fr; gap: 0.35rem; }
}

/* -------------------------------------------------- TEACHING */
.teaching { max-width: 64ch; }
.courselist { list-style: none; margin: 0 0 2.6rem; padding: 0; }
.courselist li {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 0.85rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 1.02rem;
}
.courselist__k {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--accent-2);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
  white-space: nowrap;
  flex-shrink: 0;
  min-width: 5.5rem;
  text-align: center;
}
.edu__h {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin: 0 0 0.8rem;
}
.edu ul { list-style: none; margin: 0; padding: 0; }
.edu li { padding: 0.3rem 0; color: var(--ink-soft); }

/* -------------------------------------------------- SOFTWARE */
.software {
  display: block;
  text-decoration: none;
  border: 1.5px solid var(--ink);
  border-radius: 8px;
  padding: clamp(1.6rem, 4vw, 2.6rem);
  max-width: 640px;
  background: var(--paper);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.software:hover { transform: translateY(-4px); box-shadow: 12px 12px 0 -2px var(--accent); }
.software__main { display: flex; align-items: baseline; gap: 1rem; }
.software__name {
  font-family: var(--display);
  font-weight: 600;
  font-size: clamp(1.8rem, 5vw, 2.6rem);
  letter-spacing: -0.02em;
}
.software__lang {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--paper);
  background: var(--ink);
  padding: 0.25rem 0.6rem;
  border-radius: 3px;
}
.software__desc { color: var(--ink-soft); margin: 1rem 0 1.2rem; font-size: 1rem; }
.software__stats {
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
}
.software__stats li { display: flex; align-items: baseline; gap: 0.55rem; }
.software__stats b { color: var(--ink); font-weight: 600; }
.software__statlabel {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
}
.software__go {
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: var(--accent);
}

/* --------------------------------------------------- FOOTER */
.footer {
  background: var(--ink);
  color: var(--paper);
  padding: clamp(3.5rem, 8vw, 6rem) var(--gutter);
}
.footer__inner { max-width: var(--maxw); margin: 0 auto; }
.footer__lead {
  font-family: var(--display);
  font-weight: 500;
  font-size: clamp(2rem, 6vw, 3.4rem);
  letter-spacing: -0.02em;
  margin: 0 0 1.6rem;
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  margin-bottom: 2.4rem;
}
.footer__links a {
  font-family: var(--mono);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  color: var(--paper);
  border-bottom: 1.5px solid transparent;
  padding-bottom: 2px;
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.footer__links a:hover { border-color: var(--accent); color: #fff; }
.footer__fine {
  font-family: var(--mono);
  font-size: 0.76rem;
  line-height: 1.8;
  letter-spacing: 0.02em;
  color: var(--ink-faint);
  margin: 0;
}

/* ----------------------------------------------- ANIMATION */
/* Reveal only hides content when JS is active (html.js); without JS,
   everything is visible by default — no content is ever lost. */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--d, 0ms);
}
.js .reveal.is-in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .js .reveal { opacity: 1; transform: none; transition: none; }
  .btn:hover, .card:hover, .software:hover { transform: none; }
}

/* ----------------------------------------- ACCESSIBILITY */
/* Visible keyboard focus (WCAG 2.4.7) */
a:focus-visible,
.btn:focus-visible {
  outline: 2.5px solid var(--accent-bright);
  outline-offset: 3px;
  border-radius: 3px;
}

/* Skip link (WCAG 2.4.1) — hidden until focused */
.skip {
  position: absolute;
  left: 1rem;
  top: -3rem;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 0.85rem;
  padding: 0.6rem 1rem;
  border-radius: 4px;
  text-decoration: none;
  transition: top 0.2s var(--ease);
}
.skip:focus { top: 1rem; }