:root {
  /* Anatomy-first palette: blue/teal/white/bone */
  --bg: #0f1115;
  --panel: #151922;
  --panel-alt: #10141c;
  --text: #e9eef6;
  --muted: #9fb2c2;
  --brand: #57c0ff;    /* blue */
  --brand-700: #2fa9e4; /* blue darker */
  --accent: #2dd4bf;    /* teal */
  --border: #232a37;
  --danger: #ef4444;
  --bone: #e7e3da;      /* bone tint for subtle accents */
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  background: linear-gradient(180deg, var(--bg), #0b0d12 40%);
  color: var(--text);
}

.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.container.small { max-width: 900px; }

.site-header {
  position: sticky; top: 0; z-index: 10; backdrop-filter: saturate(120%) blur(10px);
  background: rgba(10, 12, 18, 0.6); border-bottom: 1px solid var(--border);
}
.nav { display: flex; align-items: center; justify-content: space-between; padding: 14px 0; }
.brand { font-weight: 700; letter-spacing: 0.2px; }
.nav a { color: var(--muted); text-decoration: none; margin-left: 18px; font-size: 0.95rem; }
.nav a:hover { color: var(--text); }

.hero {
  background: radial-gradient(700px 300px at 20% -50%, rgba(92,200,255,0.15), transparent),
              radial-gradient(600px 260px at 80% -60%, rgba(45,212,191,0.12), transparent);
  border-bottom: 1px solid var(--border);
}
.hero .container { padding: 72px 20px 56px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 3.4vw + 1rem, 3rem); margin: 0 0 10px; }
.hero p { color: var(--muted); margin: 0 0 22px; }
.btn {
  display: inline-block; background: linear-gradient(90deg, var(--brand), var(--brand-700));
  color: #05121a; padding: 10px 16px; border-radius: 10px; font-weight: 600; text-decoration: none; border: none;
}
.btn:hover { filter: brightness(1.05); cursor: pointer; }

.section { padding: 56px 0; }
.section.alt { background: linear-gradient(180deg, var(--panel), var(--panel-alt)); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section h2 { margin: 0 0 6px; }
.muted { color: var(--muted); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid.two { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid, .grid.two { grid-template-columns: 1fr; } }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 16px; }
.card h3 { margin: 0 0 6px; }
.card p { margin: 0; color: var(--muted); }
/* transient highlight for deep links */
.card.highlight { outline: 2px solid var(--accent); box-shadow: 0 0 0 4px rgba(45,212,191,0.15); }

/* Tags for structures, procedures, etc. */
.tags { margin-top: 10px; display: flex; flex-wrap: wrap; gap: 6px; }
.tag { display: inline-block; padding: 4px 8px; font-size: 0.8rem; border-radius: 999px; color: #041018; background: linear-gradient(90deg, var(--bone), #d8f2ff); border: 1px solid #24334333; }

.form-grid { grid-template-columns: repeat(2, 1fr); }
.form-grid .full { grid-column: 1 / -1; }
label { display: flex; flex-direction: column; gap: 6px; font-size: 0.9rem; }
input, select, textarea { background: #0c1017; color: var(--text); border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; }
textarea { resize: vertical; }
.actions { display: flex; align-items: center; gap: 12px; margin-top: 10px; }
.status { color: var(--muted); font-size: 0.95rem; }
.status.ok { color: var(--accent); }
.status.err { color: var(--danger); }

.stack { display: grid; gap: 12px; }
.site-footer { border-top: 1px solid var(--border); padding: 20px 0; color: var(--muted); }
.site-footer .spacer { margin: 0 8px; color: #263243; }