:root {
  --bg: #0a0e12;
  --bg-raised: #11161c;
  --bg-card: #141a21;
  --border: #232b34;
  --text: #e6edf3;
  --text-dim: #8b98a5;
  --accent: #34d399;
  --accent-dim: #0f4a37;
  --accent-2: #38bdf8;
  --warn: #f0b429;
  --mono: ui-monospace, "Cascadia Code", "Fira Code", "SFMono-Regular", Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  position: relative; /* stacking-context root so #bg-canvas (z-index:-1) sits between this background and normal content, not behind it */
}

#bg-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  display: block;
}

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

img { max-width: 100%; display: block; border-radius: 10px; }

.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Header / nav ---- */
header.site {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: rgba(10, 14, 18, 0.9);
  backdrop-filter: blur(8px);
  z-index: 10;
}

header.site .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 16px;
  padding-bottom: 16px;
}

.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text);
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.brand span { color: var(--accent); }
.brand-icon { width: 24px; height: 24px; display: block; }

nav.site-nav { display: flex; gap: 20px; font-size: 0.92rem; }
nav.site-nav a { color: var(--text-dim); }
nav.site-nav a:hover { color: var(--text); text-decoration: none; }

/* ---- Hero ---- */
.hero { padding: 72px 0 56px; }
.hero .kicker {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 0 0 20px;
  letter-spacing: -0.02em;
}
.hero p.lede {
  color: var(--text-dim);
  font-size: 1.1rem;
  max-width: 640px;
  margin: 0 0 28px;
}
.hero .disciplines {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.hero .cta { display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 600;
  border: 1px solid var(--border);
}
.btn:hover { text-decoration: none; }
.btn.primary { background: var(--accent); color: #06251b; border-color: var(--accent); }
.btn.primary:hover { background: #2bc38d; }
.btn.ghost { background: transparent; color: var(--text); }
.btn.ghost:hover { border-color: var(--text-dim); }

/* ---- Tags ---- */
.tag {
  font-family: var(--mono);
  font-size: 0.72rem;
  padding: 4px 9px;
  border-radius: 6px;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  color: var(--text-dim);
  white-space: nowrap;
}
.tag.accent { color: var(--accent); border-color: var(--accent-dim); background: rgba(52, 211, 153, 0.08); }

/* ---- Section headers ---- */
section.category { padding: 44px 0; border-top: 1px solid var(--border); }
section.category h2 {
  font-family: var(--mono);
  font-size: 1.4rem;
  margin: 0 0 6px;
}
section.category .category-desc {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin: 0 0 24px;
  max-width: 640px;
}
.featured-ref {
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 18px;
}

/* ---- Featured cards (homepage) ---- */
h2.section-title {
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--text-dim);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin: 0 0 24px;
}

.featured-grid { display: grid; gap: 20px; }

.featured-card {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.15s;
}
.featured-card:hover { border-color: var(--accent-dim); }
.featured-card .thumb {
  background: var(--bg-raised);
  min-height: 220px;
  overflow: hidden;
}
.featured-card .thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; display: block; }
.featured-card .body { padding: 26px 28px; display: flex; flex-direction: column; }
.featured-card .num {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 0.8rem;
  margin-bottom: 8px;
}
.featured-card h3 { margin: 0 0 10px; font-size: 1.35rem; }
.featured-card p { color: var(--text-dim); margin: 0 0 16px; font-size: 0.95rem; }
.featured-card .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 18px; }
.featured-card .links { display: flex; gap: 14px; margin-top: auto; font-size: 0.88rem; }

@media (max-width: 720px) {
  .featured-card { grid-template-columns: 1fr; }
  .featured-card .thumb { min-height: 160px; }
}

/* ---- Small project cards ---- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 14px;
}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.project-card .thumb { height: 130px; overflow: hidden; background: var(--bg-raised); }
.project-card .thumb img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
.project-card .card-body { padding: 18px; }
.project-card h4 { margin: 0 0 6px; font-size: 1rem; }
.project-card .skill { font-size: 0.82rem; color: var(--accent); font-family: var(--mono); margin-bottom: 8px; }
.project-card p { font-size: 0.85rem; color: var(--text-dim); margin: 0 0 12px; }
.project-card .tags { display: flex; flex-wrap: wrap; gap: 5px; margin-bottom: 12px; }
.project-card a.repo-link { font-size: 0.82rem; font-family: var(--mono); }

/* ---- Detail pages ---- */
.detail-hero { padding: 48px 0 32px; border-bottom: 1px solid var(--border); }
.detail-hero .back { font-size: 0.85rem; color: var(--text-dim); margin-bottom: 18px; display: inline-block; }
.detail-hero h1 { font-size: clamp(1.8rem, 4vw, 2.6rem); margin: 0 0 14px; }
.detail-hero .summary { color: var(--text-dim); font-size: 1.05rem; max-width: 720px; margin: 0 0 20px; }
.detail-hero .tags { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 22px; }
.detail-hero .meta-links { display: flex; gap: 16px; font-size: 0.9rem; flex-wrap: wrap; }

.detail-body { padding: 44px 0; }
.detail-body section { margin-bottom: 44px; }
.detail-body h2 {
  font-family: var(--mono);
  font-size: 1.15rem;
  color: var(--accent);
  margin: 0 0 14px;
}
.detail-body p { color: var(--text-dim); max-width: 720px; }
.detail-body p strong { color: var(--text); }

.flow {
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px 20px;
  color: var(--accent-2);
  overflow-x: auto;
  white-space: pre;
  max-width: 100%;
}

.shot-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 16px; }
.shot { background: var(--bg-raised); border: 1px solid var(--border); border-radius: 10px; overflow: hidden; }
.shot img { border-radius: 0; }
.shot .cap { padding: 10px 14px; font-size: 0.82rem; color: var(--text-dim); }

.specs { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 10px; }
.specs .spec { background: var(--bg-raised); border: 1px solid var(--border); border-radius: 8px; padding: 12px 14px; }
.specs .spec .k { font-size: 0.78rem; color: var(--text-dim); font-family: var(--mono); }
.specs .spec .v { font-size: 0.92rem; margin-top: 2px; }

.note {
  border-left: 3px solid var(--warn);
  background: rgba(240, 180, 41, 0.07);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  font-size: 0.88rem;
  color: var(--text-dim);
  max-width: 720px;
}
.note strong { color: var(--warn); }

table.stat-table { border-collapse: collapse; width: 100%; max-width: 640px; font-size: 0.88rem; }
table.stat-table th, table.stat-table td { border: 1px solid var(--border); padding: 8px 12px; text-align: right; }
table.stat-table th:first-child, table.stat-table td:first-child { text-align: left; color: var(--text-dim); }
table.stat-table th { font-family: var(--mono); color: var(--text-dim); font-weight: 600; font-size: 0.78rem; }

/* ---- Architecture diagram (IlmQuest, no screenshots) ---- */
.arch-diagram {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}
.arch-node {
  font-family: var(--mono);
  font-size: 0.82rem;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 14px;
  color: var(--text);
}
.arch-node.accent { border-color: var(--accent-dim); color: var(--accent); }
.arch-arrow { color: var(--text-dim); font-family: var(--mono); }

/* ---- Footer ---- */
footer.site {
  border-top: 1px solid var(--border);
  padding: 40px 0;
  margin-top: 40px;
  color: var(--text-dim);
  font-size: 0.9rem;
}
footer.site .links { display: flex; gap: 20px; margin-top: 10px; flex-wrap: wrap; }