/* ==========================================================================
   Quentin Paletta — modern site theme
   Dark, technical/scientific aesthetic (satellite/energy-data inspired)
   ========================================================================== */

:root {
  --bg: #0a0e13;
  --bg-1: #0d1218;
  --bg-elevated: #121821;
  --bg-elevated-2: #161d28;
  --border: #212a36;
  --border-soft: #1a222c;

  --text-primary: #e8edf3;
  --text-secondary: #9fadbc;
  --text-tertiary: #647085;

  --accent: #ffb648;       /* solar amber */
  --accent-soft: rgba(255, 182, 72, 0.12);
  --accent-2: #4fd1e0;     /* sky / satellite cyan */
  --accent-2-soft: rgba(79, 209, 224, 0.12);

  --mono: 'JetBrains Mono', 'SFMono-Regular', Consolas, Menlo, monospace;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;

  --max-width: 1040px;
  --radius: 10px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  background-image:
    linear-gradient(var(--border-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
  background-size: 48px 48px;
  background-attachment: fixed;
  color: var(--text-primary);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover, a:focus { color: var(--accent); }

h1, h2, h3 { font-family: var(--sans); font-weight: 650; line-height: 1.2; margin: 0; color: var(--text-primary); }
p { margin: 0; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 12px 0;
}

/* ---------------------------------- Nav ---------------------------------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: rgba(10, 14, 19, 0.82);
  border-bottom: 1px solid var(--border-soft);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  font-family: var(--mono);
  font-weight: 600;
  font-size: 15px;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}
.brand:hover { color: var(--accent); }
.brand .dot { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-secondary);
}
.nav-links a:hover { color: var(--text-primary); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-primary);
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

/* --------------------------------- Hero ---------------------------------- */

.hero {
  padding: 96px 0 72px;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 56px;
  align-items: center;
}

.hero h1 {
  font-size: 46px;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.hero-role {
  font-size: 19px;
  color: var(--text-primary);
  margin-bottom: 18px;
  line-height: 1.5;
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 15.5px;
  max-width: 54ch;
  margin-bottom: 30px;
}

.hero-cta {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.btn {
  font-family: var(--mono);
  font-size: 13px;
  padding: 11px 20px;
  border-radius: 7px;
  border: 1px solid transparent;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}

.btn-primary {
  background: var(--accent);
  color: #16130a;
  font-weight: 600;
}
.btn-primary:hover { background: #ffc670; color: #16130a; }

.btn-ghost {
  border-color: var(--border);
  color: var(--text-primary);
  background: var(--bg-elevated);
}
.btn-ghost:hover { border-color: var(--accent-2); color: var(--accent-2); }

.social-row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 18px;
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-tertiary);
}

.hero-photo-wrap {
  position: relative;
  justify-self: center;
}

.hero-photo-wrap::before {
  content: '';
  position: absolute;
  inset: -18px;
  background: radial-gradient(circle at 40% 30%, var(--accent-soft), transparent 70%);
  z-index: 0;
  border-radius: 50%;
}

.hero-photo {
  position: relative;
  z-index: 1;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  display: block;
}

/* -------------------------------- Sections -------------------------------- */

.section {
  padding: 68px 0;
  border-top: 1px solid var(--border-soft);
}

.section h2 {
  font-size: 28px;
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.section-lead {
  color: var(--text-secondary);
  max-width: 68ch;
  margin-bottom: 8px;
  font-size: 15.5px;
}

/* -------------------------------- Timeline -------------------------------- */

.timeline {
  list-style: none;
  margin: 36px 0 0 0;
  padding: 0;
  position: relative;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 7px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--border);
}

.timeline-item {
  position: relative;
  padding: 0 0 40px 34px;
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border);
}

.timeline-item.current::before {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.timeline-header {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 6px;
}

.timeline-role {
  font-size: 17px;
  font-weight: 650;
  color: var(--text-primary);
}

.timeline-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 2px 8px;
}

.timeline-org {
  color: var(--accent-2);
  font-size: 14.5px;
  margin-bottom: 8px;
  display: block;
}

.timeline-desc {
  color: var(--text-secondary);
  font-size: 14.5px;
  max-width: 66ch;
}

/* -------------------------------- Wematics --------------------------------- */

.wematics-section {
  background:
    radial-gradient(1200px 300px at 20% 0%, var(--accent-soft), transparent 60%),
    var(--bg-1);
}

.spotlight-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: start;
}

.feature-list {
  list-style: none;
  margin: 24px 0 28px 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.feature-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 14.5px;
  color: var(--text-secondary);
}

.feature-list .icon {
  color: var(--accent);
  font-family: var(--mono);
  flex: none;
}

.spotlight-panel {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px;
}

.spotlight-panel-title {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 16px;
}

.spotlight-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.spotlight-steps li {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 12px;
  align-items: start;
}

.spotlight-steps .num {
  font-family: var(--mono);
  color: var(--accent-2);
  font-size: 13px;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.spotlight-steps strong {
  display: block;
  font-size: 14.5px;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.spotlight-steps span {
  font-size: 13.5px;
  color: var(--text-secondary);
}

/* ------------------------------ Publications ------------------------------ */

.pub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 32px;
}

.pub-card {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
}

.pub-thumb-wrap {
  position: relative;
  width: 84px;
  height: 84px;
  border-radius: 6px;
  overflow: hidden;
  border: 1px solid var(--border);
  flex: none;
  background: #05070a;
}

.pub-thumb-wrap img,
.pub-thumb-wrap video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.pub-thumb-wrap video {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .2s ease-in-out;
}

.pub-kind {
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 4px;
  display: block;
}

.pub-title {
  font-size: 14.5px;
  font-weight: 650;
  color: var(--text-primary);
  line-height: 1.35;
  display: block;
  margin-bottom: 4px;
}
a.pub-title:hover { color: var(--accent-2); }

.pub-meta {
  font-size: 12.5px;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.pub-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.pub-links {
  font-family: var(--mono);
  font-size: 12px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.pub-links a, .pub-links span[data-bibtex] {
  color: var(--text-tertiary);
  cursor: pointer;
}
.pub-links a:hover, .pub-links span[data-bibtex]:hover { color: var(--accent-2); }

.view-all {
  display: inline-block;
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 13.5px;
  color: var(--accent-2);
}
.view-all:hover { color: var(--accent); }

.pub-authors {
  font-size: 12.5px;
  color: var(--text-tertiary);
  line-height: 1.6;
  margin-bottom: 6px;
}
.pub-authors strong { color: var(--text-secondary); }
.pub-authors a { color: var(--text-tertiary); }
.pub-authors a:hover { color: var(--accent-2); }

.pub-card.featured {
  border-color: var(--accent);
  box-shadow: inset 3px 0 0 var(--accent);
}

.pub-year {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-tertiary);
  margin: 44px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
}
.pub-year:first-of-type { margin-top: 8px; }

.pub-legend {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-top: 10px;
}
.pub-legend .swatch {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  background: var(--accent);
  margin-right: 6px;
  vertical-align: middle;
}

.back-link {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-tertiary);
}
.back-link:hover { color: var(--accent-2); }

.page-header {
  padding: 48px 0 8px;
}
.page-header h1 {
  font-size: 32px;
  margin: 10px 0 12px;
}

/* -------------------------------- Community -------------------------------- */

.community-section .container {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 40px;
  align-items: center;
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-family: var(--mono);
  font-size: 14px;
}

.contact-links a { color: var(--text-primary); }
.contact-links a:hover { color: var(--accent); }
.contact-links .label { color: var(--text-tertiary); margin-right: 8px; }

/* --------------------------------- Footer ---------------------------------- */

.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 28px 0 44px;
}

.site-footer .container {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--text-tertiary);
}

/* -------------------------------- Utilities -------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* --------------------------------- Mobile ---------------------------------- */

@media (max-width: 860px) {
  .hero-inner { grid-template-columns: 1fr; gap: 32px; }
  .hero-photo-wrap { order: -1; justify-self: start; }
  .hero-photo { width: 120px; height: 120px; }
  .spotlight-grid { grid-template-columns: 1fr; }
  .pub-grid { grid-template-columns: 1fr; }
  .community-section .container { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px 24px 16px;
    display: none;
  }
  .nav-links.is-open { display: flex; }
  .nav-links li { width: 100%; padding: 10px 0; border-bottom: 1px solid var(--border-soft); }
  .nav-toggle { display: flex; }
  .hero { padding: 56px 0 48px; }
  .hero h1 { font-size: 34px; }
  .section { padding: 48px 0; }
  .pub-card { grid-template-columns: 64px 1fr; }
  .pub-thumb-wrap { width: 64px; height: 64px; }
}