:root {
  --bg: #f4f2ed;
  --ink: #1a1814;
  --muted: #6b6560;
  --accent: #2a5c8a;
  --accent-light: #d4e4f2;
  --rule: #d0cbc4;
  --card: #fff;
  --mono: 'DM Mono', 'Courier New', monospace;
  --serif: Helvetica Neue, Helvetica, Arial, sans-serif;
  --sans: Helvetica Neue, Helvetica, Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  font-size: 16px;
}

/* ── NAV ── */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  height: 56px;
}
.nav-name {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
}
.nav-links { display: flex; gap: 2rem; list-style: none; }
.nav-links a {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--accent); }

/* ── PAGE WRAPPER ── */
.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 4rem 2rem;
}
.page + .page, section + section { border-top: 1px solid var(--rule); }

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 4rem;
  align-items: start;
  padding-top: 5rem;
}

/* ── TYPOGRAPHY ── */
.section-label {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.5rem;
}
h1 {
  font-family: var(--serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 400;
  line-height: 1.1;
  margin-bottom: 0.4rem;
}
h2 {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 400;
  margin-bottom: 1.2rem;
}
h3 {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
  margin-bottom: 1.2rem;
  margin-top: 2rem;
}

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border: 1px solid var(--ink);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--ink);
  background: transparent;
  transition: background 0.2s, color 0.2s;
}
.btn:hover { background: var(--ink); color: var(--bg); }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { background: #1e4668; border-color: #1e4668; }

/* ── TAGS ── */
.tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  background: var(--accent-light);
  color: var(--accent);
  border: 1px solid #b8d3ea;
}

/* ── PUBLICATIONS ── */
.pub {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px dashed var(--rule);
}
.pub:last-child { border-bottom: none; }
.pub-year { font-family: var(--mono); font-size: 0.72rem; color: var(--muted); padding-top: 0.15rem; }
.pub-title { font-size: 0.94rem; font-weight: 500; margin-bottom: 0.2rem; }
.pub-authors { font-size: 0.82rem; color: var(--muted); margin-bottom: 0.2rem; }
.pub-venue { font-size: 0.8rem; font-style: italic; color: var(--muted); margin-bottom: 0.4rem; }
.pub-links { display: flex; gap: 0.6rem; flex-wrap: wrap; }
.pub-link {
  font-family: var(--mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-light);
  padding-bottom: 1px;
  transition: border-color 0.2s;
}
.pub-link:hover { border-color: var(--accent); }

/* ── SOFTWARE CARDS ── */
.software-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}
.pkg-card {
  background: var(--card);
  border: 1px solid var(--rule);
  padding: 1.5rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.pkg-card:hover {
  border-color: var(--accent);
  box-shadow: 4px 4px 0 var(--accent-light);
}
.pkg-name { font-family: var(--mono); font-size: 0.85rem; color: var(--accent); margin-bottom: 0.2rem; }
.pkg-lang { font-family: var(--mono); font-size: 0.62rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin-bottom: 0.8rem; }
.pkg-desc { font-size: 0.84rem; color: var(--muted); line-height: 1.6; margin-bottom: 1rem; }
.pkg-link { font-family: var(--mono); font-size: 0.65rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--accent); text-decoration: none; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--rule);
  padding: 2rem;
  text-align: center;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ── ANIMATIONS ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ── RESPONSIVE ── */
@media (max-width: 680px) {
  nav { padding: 0 1rem; }
  .nav-links { gap: 1rem; }
  .page { padding: 2.5rem 1rem; }
}

@media (max-width: 680px) {
  .hero-grid {
    grid-template-columns: 1fr !important;
    gap: 2rem;
    padding-top: 2.5rem;
  }
  .hero-photo {
    max-width: 200px;
  }
}