/* ============================================================
   Nicholas Leybourne — personal site
   Modern editorial design system
   ============================================================ */

:root {
  --ink:        #1a1a1a;
  --ink-soft:   #4a4a4a;
  --ink-faint:  #8a8a86;
  --line:       #e6e4df;
  --line-soft:  #efedf8;
  --bg:         #fbfaf8;
  --surface:    #ffffff;
  --surface-2:  #f4f2ee;
  --accent:     #0e6e63;
  --accent-deep:#0a4f47;
  --accent-tint:#e7f1ef;

  --font-display: 'Cabinet Grotesk', 'Satoshi', system-ui, sans-serif;
  --font-body:    'Satoshi', system-ui, -apple-system, sans-serif;

  --maxw: 1120px;
  --radius: 14px;
  --radius-sm: 10px;
  --shadow-sm: 0 1px 2px rgba(20,20,20,.04), 0 2px 8px rgba(20,20,20,.04);
  --shadow-md: 0 4px 14px rgba(20,20,20,.06), 0 10px 30px rgba(20,20,20,.06);
  --ease: cubic-bezier(.16,1,.3,1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

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

a { color: var(--accent); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--accent-deep); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 700; line-height: 1.08; letter-spacing: -.01em; color: var(--ink); }

/* ---------- Top navigation ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(251,250,248,.78);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .3s var(--ease);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }

.nav {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: .9rem clamp(1.1rem, 4vw, 2rem);
}
.brand { display: flex; align-items: center; gap: .65rem; font-family: var(--font-display); font-weight: 700; font-size: 1.02rem; letter-spacing: -.01em; color: var(--ink); }
.brand .mark { color: var(--accent); }
.brand:hover { color: var(--ink); }

.nav-links { display: flex; align-items: center; gap: .35rem; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  color: var(--ink-soft); font-size: .88rem; font-weight: 500;
  padding: .5rem .8rem; border-radius: 8px;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.nav-links a:hover { color: var(--ink); background: var(--surface-2); }
.nav-links a.active { color: var(--accent); }

.nav-toggle { display: none; background: none; border: 0; cursor: pointer; padding: .4rem; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); margin: 4px 0; transition: .3s var(--ease); border-radius: 2px; }

/* ---------- Layout shell ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 clamp(1.1rem, 4vw, 2rem); }
.section { padding: clamp(3rem, 7vw, 5.5rem) 0; }
.section-head { margin-bottom: 2.4rem; }
.eyebrow {
  font-size: .72rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  color: var(--accent); margin: 0 0 .7rem;
}
.section-head h2 { font-size: clamp(1.6rem, 3.2vw, 2.3rem); margin: 0; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); padding: 2.6rem 0; margin-top: 1rem; }
.footer-inner { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between; }
.footer-inner p { margin: 0; color: var(--ink-faint); font-size: .85rem; }
.footer-social { display: flex; gap: 1.1rem; }
.footer-social a { color: var(--ink-soft); font-size: .85rem; font-weight: 500; }
.footer-social a:hover { color: var(--accent); }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   HOME / ABOUT
   ============================================================ */
.hero { padding: clamp(3.2rem, 8vw, 6rem) 0 clamp(2.4rem, 5vw, 3.5rem); }
.hero-grid { display: grid; grid-template-columns: 1.35fr .85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
.hero-eyebrow { font-size: .74rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase; color: var(--accent); margin: 0 0 1.1rem; }
.hero h1 { font-size: clamp(2.4rem, 6vw, 4.1rem); line-height: 1.02; margin: 0 0 1.2rem; letter-spacing: -.02em; }
.hero h1 .accent { color: var(--ink); }
.hero-lead { font-size: clamp(1rem, 1.6vw, 1.12rem); color: var(--ink-soft); max-width: 52ch; margin: 0 0 1.8rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; }

.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-body); font-weight: 600; font-size: .9rem;
  padding: .72rem 1.3rem; border-radius: 999px; cursor: pointer;
  transition: transform .25s var(--ease), background .25s var(--ease), box-shadow .25s var(--ease), color .25s var(--ease);
  border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); color: #fff; transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--ink); color: var(--ink); transform: translateY(-2px); }

.portrait-wrap { position: relative; }
.portrait-wrap::before {
  content: ""; position: absolute; inset: -14px -14px 14px 14px;
  border: 1px solid var(--accent); border-radius: var(--radius); z-index: 0; opacity: .5;
}
.portrait { position: relative; z-index: 1; width: 100%; aspect-ratio: 1/1; object-fit: cover; border-radius: var(--radius); box-shadow: var(--shadow-md); }

/* stats / quick facts */
.facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); padding: 1.8rem 0; }
.fact .num { font-family: var(--font-display); font-size: clamp(1.6rem, 3vw, 2.2rem); font-weight: 700; color: var(--ink); line-height: 1; }
.fact .lbl { font-size: .82rem; color: var(--ink-faint); margin-top: .4rem; }

/* focus / expertise cards */
.card-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 1.1rem; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem 1.4rem; transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--accent-tint); }
.card .ico { width: 38px; height: 38px; border-radius: 10px; background: var(--accent-tint); color: var(--accent); display: grid; place-items: center; font-size: 1.05rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.05rem; margin: 0 0 .5rem; }
.card p { margin: 0; font-size: .92rem; color: var(--ink-soft); }

/* link row (profiles) */
.links-row { display: flex; flex-wrap: wrap; gap: .7rem; }
.link-pill {
  display: inline-flex; align-items: center; gap: .55rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: 999px;
  padding: .5rem .95rem .5rem .6rem; font-size: .88rem; font-weight: 500; color: var(--ink);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}
.link-pill:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: var(--accent-tint); color: var(--ink); }
.link-pill img { width: 22px; height: 22px; object-fit: contain; border-radius: 5px; }

/* contact band */
.contact-band { background: var(--ink); color: #fff; border-radius: var(--radius); padding: clamp(2rem, 5vw, 3rem); }
.contact-band h2 { color: #fff; font-size: clamp(1.5rem, 3vw, 2rem); margin: 0 0 .6rem; }
.contact-band p { color: rgba(255,255,255,.72); margin: 0 0 1.6rem; max-width: 48ch; }
.contact-rows { display: flex; flex-wrap: wrap; gap: .8rem; }
.contact-chip {
  display: inline-flex; align-items: center; gap: .55rem;
  background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.16); color: #fff;
  border-radius: 999px; padding: .6rem 1.1rem; font-size: .9rem; font-weight: 500;
  transition: background .25s var(--ease), transform .25s var(--ease);
}
.contact-chip:hover { background: rgba(255,255,255,.16); color: #fff; transform: translateY(-2px); }
.contact-chip.wa { background: var(--accent); border-color: var(--accent); }
.contact-chip.wa:hover { background: var(--accent-deep); }

/* ============================================================
   INTERIOR PAGES (Professional / Publications / Accomplishments)
   ============================================================ */
.page-hero { padding: clamp(2.6rem, 6vw, 4rem) 0 clamp(1.4rem, 3vw, 2.2rem); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 0 0 .9rem; letter-spacing: -.02em; }
.page-hero p { color: var(--ink-soft); max-width: 64ch; margin: 0; font-size: 1.02rem; }

/* timeline-style entries */
.entry {
  display: grid; grid-template-columns: 1fr auto; gap: 1.5rem;
  padding: 1.6rem 0; border-bottom: 1px solid var(--line);
}
.entry:last-child { border-bottom: 0; }
.entry .title { font-family: var(--font-display); font-weight: 700; font-size: 1.12rem; margin: 0 0 .15rem; color: var(--ink); }
.entry .org { font-weight: 600; color: var(--accent); font-size: .98rem; }
.entry .desc { margin: .6rem 0 0; color: var(--ink-soft); font-size: .96rem; max-width: 68ch; }
.entry .desc a { font-weight: 600; }
.entry .meta { text-align: right; font-size: .85rem; color: var(--ink-faint); font-weight: 600; white-space: nowrap; }

/* skills tags */
.tag-group { margin-bottom: 1.3rem; }
.tag-group .label { font-family: var(--font-display); font-weight: 700; font-size: 1rem; margin-bottom: .7rem; }
.tags { display: flex; flex-wrap: wrap; gap: .5rem; }
.tag { background: var(--surface); border: 1px solid var(--line); border-radius: 999px; padding: .35rem .85rem; font-size: .85rem; color: var(--ink-soft); font-weight: 500; }

/* ---------- Feed cards (publications / accomplishments) ---------- */
.feed { display: flex; flex-direction: column; gap: 1.6rem; }
.feed-card {
  display: grid; grid-template-columns: 280px 1fr; gap: 1.8rem;
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.5rem; box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.feed-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); border-color: var(--accent-tint); }
.feed-card.flip { grid-template-columns: 1fr 280px; }
.feed-card.flip .feed-media { order: 2; }

.feed-media { border-radius: var(--radius-sm); overflow: hidden; background: var(--surface-2); display: grid; place-items: center; }
.feed-media img { width: 100%; height: 100%; min-height: 220px; object-fit: cover; }
.feed-media.wide { background: #0b3a66; }
.feed-media.wide img { object-fit: contain; min-height: 0; }

.feed-body { display: flex; flex-direction: column; }
.feed-body h3 { font-size: 1.18rem; margin: 0 0 .5rem; line-height: 1.2; }
.feed-authors { font-size: .9rem; color: var(--ink-faint); margin: 0 0 .15rem; font-weight: 500; }
.feed-doi { font-size: .88rem; font-weight: 600; }
.feed-body p.txt { margin: .8rem 0 0; color: var(--ink-soft); font-size: .95rem; }
.feed-date { margin-top: auto; padding-top: 1rem; font-size: .82rem; font-weight: 600; color: var(--accent); letter-spacing: .02em; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 880px) {
  .hero-grid { grid-template-columns: 1fr; }
  .portrait-wrap { max-width: 320px; margin: .5rem auto 0; }
  .feed-card, .feed-card.flip { grid-template-columns: 1fr; }
  .feed-card.flip .feed-media { order: 0; }
  .feed-media img { min-height: 200px; max-height: 280px; }
}

@media (max-width: 720px) {
  /* comfortable side margins on small screens */
  .wrap { padding: 0 1.25rem; }
  .nav { padding: .85rem 1.25rem; gap: 1rem; }
  .brand { font-size: .95rem; min-width: 0; }
  .nav-toggle { flex: 0 0 auto; }
  .nav-links {
    position: fixed; inset: 58px 0 auto 0; flex-direction: column; align-items: stretch;
    background: rgba(251,250,248,.98); backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line); padding: .6rem 1.25rem 1.1rem;
    gap: .1rem; transform: translateY(-150%); transition: transform .35s var(--ease); pointer-events: none;
    visibility: hidden;
  }
  .nav-links.open { transform: none; pointer-events: auto; visibility: visible; }
  .nav-links a { padding: .85rem .8rem; font-size: 1rem; }
  .nav-toggle { display: block; }
  .facts { grid-template-columns: 1fr; gap: 1.1rem; text-align: left; }
  .entry { grid-template-columns: 1fr; gap: .4rem; }
  .entry .meta { text-align: left; }
  .feed-card, .feed-card.flip { padding: 1.2rem; }
}

@media (max-width: 420px) {
  .brand { font-size: .9rem; gap: .5rem; }
}