@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;600&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,600;1,300&display=swap');

:root {
  --bg: #f5f4f0;
  --surface: #ffffff;
  --nav-bg: #1a1f2e;
  --nav-text: #c8d0e0;
  --nav-hover: #7ec8c8;
  --accent: #2a8fa0;
  --accent-dark: #1a6070;
  --text: #1c1c2a;
  --text-muted: #555566;
  --border: #dddde8;
  --tag-bg: #e8f4f7;
  --tag-text: #1a6070;
}

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

body {
  font-family: 'IBM Plex Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;

  max-width: 900px;
  margin: auto;
  padding: 2rem;
}

/* ─── HEADER ────────────────────────────────────── */
header {
  background: var(--nav-bg);
  padding: 0;
}

.site-brand {
  padding: 18px 32px 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--nav-hover);
  text-transform: uppercase;
}

nav {
  display: flex;
  flex-wrap: wrap;
  padding: 8px 24px 0;
  gap: 0;
}

nav a {
  display: inline-block;
  padding: 10px 14px;
  color: var(--nav-text);
  text-decoration: none;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.02em;
  border-bottom: 3px solid transparent;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}

nav a:hover, nav a.active {
  color: var(--nav-hover);
  border-bottom-color: var(--nav-hover);
}

/* ─── MAIN ────────────────────────────────────── */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 48px 32px 80px;
}

/* ─── PAGE TITLE ────────────────────────────────── */
.page-title {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 6px;
}

h1 {
  font-size: 28px;
  font-weight: 300;
  line-height: 1.3;
  color: var(--text);
  margin-bottom: 28px;
}

h2 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
  margin: 40px 0 14px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent);
  letter-spacing: 0.03em;
}

h3 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  margin: 24px 0 8px;
}

p { margin-bottom: 16px; }

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* ─── HOME PAGE ────────────────────────────────── */
.hero-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 36px 0 48px;
}

.hero-card {
  padding: 1.5rem;
  border-radius: 12px;
  background: #fafafa;
  border: 1px solid #e5e5e5;
  transition: transform 0.2s ease;
}

.hero-card:hover {
  transform: translateY(-3px);
}

.hero-card .card-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 10px;
}

.hero-card p {
  font-size: 14px;
  color: var(--text-muted);
  margin: 0;
  line-height: 1.5;
}

.tagline {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  border-left: 3px solid var(--accent);
  padding-left: 16px;
  margin-top: 40px;
}

/* ─── PUBLICATIONS ──────────────────────────────── */
.pub-entry {
  padding: 16px 0;
  border-bottom: 1px solid var(--border);
}

.pub-entry:last-child { border-bottom: none; }

.pub-entry p {
  font-size: 14.5px;
  margin: 0 0 6px;
  line-height: 1.6;
}

.pub-entry .pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 6px;
}

.pub-link {
  font-size: 12px;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--accent);
  background: var(--tag-bg);
  padding: 3px 10px;
  border-radius: 2px;
  border: 1px solid #c2e0e8;
  text-decoration: none;
}
.pub-link:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-color: var(--accent);
}

.pub-note {
  font-size: 13px;
  color: var(--text-muted);
  font-style: italic;
  margin-top: 4px;
}

.section-recent {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.section-recent .recent-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

/* ─── CONTENT BLOCKS ────────────────────────────── */
.concept-block {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 24px;
  margin-bottom: 20px;
}

.concept-block .concept-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}

.concept-block ul {
  list-style: none;
  padding: 0;
}

.concept-block ul li {
  font-size: 14.5px;
  padding: 5px 0;
  padding-left: 18px;
  position: relative;
  color: var(--text);
}

.concept-block ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 12px;
}

/* ─── FOOTER ────────────────────────────────────── */
footer {
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  font-family: 'IBM Plex Mono', monospace;
}

/* ─── RESPONSIVE ────────────────────────────────── */
@media (max-width: 700px) {
  main { padding: 28px 18px 60px; }
  .hero-grid { grid-template-columns: 1fr; }
  nav a { padding: 8px 10px; font-size: 12px; }
  .site-brand { padding: 14px 18px 0; }
}