/* Components. Requires tokens.css. */
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-sans); font-size: var(--fs-body); line-height: var(--lh-body);
  background: var(--surface); color: var(--ink);
  line-break: strict; overflow-wrap: anywhere;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Site header / nav */
.site-header { background: var(--ink); color: var(--card); }
.site-header .inner {
  max-width: var(--content-max); margin: 0 auto; padding: calc(var(--space) * 1.5) calc(var(--space) * 3);
  display: flex; align-items: center; justify-content: space-between; gap: calc(var(--space) * 2); flex-wrap: wrap;
}
.site-header .brand { color: var(--card); font-weight: 700; }
.site-nav { display: flex; gap: calc(var(--space) * 2.5); flex-wrap: wrap; font-size: .9rem; }
.site-nav a { color: var(--card); opacity: .85; }
.site-nav a[aria-current="page"], .site-nav a:hover { opacity: 1; text-decoration: none; border-bottom: 2px solid var(--accent); }

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--ink) 0%, var(--primary) 55%, var(--accent) 100%);
  color: var(--card); padding: calc(var(--space) * 5) calc(var(--space) * 3) calc(var(--space) * 4); position: relative;
}
.hero .inner { max-width: var(--content-max); margin: 0 auto; }
.hero .kicker { font-size: .78rem; text-transform: uppercase; letter-spacing: .08em; opacity: .9; margin-bottom: .35rem; }
.hero h1 { font-size: 1.9rem; font-weight: 700; letter-spacing: -.02em; margin-bottom: .4rem; }
.hero .subtitle { opacity: .92; font-size: 1rem; margin-bottom: 1.25rem; }
.hero-meta { display: flex; flex-wrap: wrap; gap: .55rem 1.5rem; font-size: .82rem; opacity: .95; }
.hero-meta span::before { content: "● "; opacity: .55; }
.hero-meta a { color: var(--card); text-decoration: underline; }
.hero .badge { position: absolute; top: calc(var(--space) * 2); right: calc(var(--space) * 2.5); }

/* Layout */
.container { max-width: var(--content-max); margin: 0 auto; padding: calc(var(--space) * 3); }
.grid { display: grid; gap: calc(var(--space) * 2.5); grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.section, .card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: calc(var(--space) * 3) calc(var(--space) * 3.5); margin-bottom: calc(var(--space) * 2.5);
}
.grid > .card { margin-bottom: 0; }

/* Heading hierarchy */
.section h2 {
  font-size: 1.25rem; font-weight: 700; margin-bottom: 1.25rem;
  padding-bottom: .6rem; border-bottom: 2px solid var(--ink);
}
.section h3, .card h3 {
  font-size: 1rem; font-weight: 700; color: var(--primary);
  border-left: 4px solid var(--primary); padding-left: .75rem; margin: 1.75rem 0 .65rem;
}
.card h3:first-child { margin-top: 0; }
.section h4 {
  font-size: .88rem; font-weight: 700; background: var(--surface);
  padding: .35rem .75rem; border-radius: 4px; margin: 1.25rem 0 .6rem;
}
.section p, .card p { margin: .55rem 0; }
.section ul, .section ol { margin: .55rem 0 .55rem 1.4rem; }
.section li { margin: .25rem 0; }

/* Table: header underline only, no vertical lines */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .87rem; margin: 1rem 0; }
th, td { padding: .85rem 1.1rem; text-align: left; vertical-align: top; }
th { font-weight: 700; font-size: .78rem; text-transform: uppercase; letter-spacing: .05em; border-bottom: 2px solid var(--ink); }
td { border-bottom: 1px solid var(--surface); }
tr:last-child td { border-bottom: none; }
tbody tr:hover td { background: var(--row-hover); }

/* Callouts */
.callout, blockquote {
  border-left: 4px solid var(--warn); background: var(--warn-bg);
  padding: .75rem 1rem; margin: .75rem 0; border-radius: 0 var(--radius) var(--radius) 0;
}
.callout.critical { border-left-color: var(--critical); background: var(--critical-bg); }
.callout.info { border-left-color: var(--accent); background: var(--row-hover); }

/* Badge */
.badge {
  display: inline-block; padding: .3rem .7rem; border-radius: 4px;
  font-size: .72rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  background: var(--border); color: var(--ink);
}
.badge.primary  { background: var(--primary);  color: var(--card); }
.badge.critical { background: var(--critical); color: var(--card); }
.badge.strong   { background: var(--ink); color: var(--card); border-left: 4px solid var(--critical); }

/* Buttons */
.btn {
  display: inline-block; padding: .6rem 1.1rem; border-radius: 6px; font-weight: 700; font-size: .9rem;
  background: var(--primary); color: var(--card); border: 2px solid var(--primary);
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn.ghost { background: transparent; color: var(--primary); }

/* Code */
code { font-family: var(--font-mono); font-size: .85em; background: var(--surface); padding: .1rem .35rem; border-radius: 3px; }
pre { background: var(--code-bg); color: var(--code-fg); padding: 1rem 1.15rem; border-radius: 8px; overflow-x: auto; font-size: .82rem; margin: .75rem 0; }
pre code { background: transparent; padding: 0; color: inherit; }

/* Accent text */
.grad-accent {
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 700;
}

/* Diagrams */
.figure { margin: 1rem 0; text-align: center; overflow-x: auto; }
.figure svg, .figure img { max-width: 100%; height: auto; border-radius: 8px; }

/* Footer */
.site-footer { text-align: center; padding: calc(var(--space) * 3); font-size: .78rem; }

@media (max-width: 640px) {
  .hero h1 { font-size: 1.45rem; }
  .container { padding: calc(var(--space) * 2); }
  .section, .card { padding: calc(var(--space) * 2) calc(var(--space) * 2.5); }
  .hero .badge { position: static; margin-bottom: .75rem; }
}
@media print {
  body { background: var(--card); }
  .site-header, .site-nav { display: none; }
  .hero { background: var(--ink); -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  .section, .card { box-shadow: none; border: 1px solid var(--border); }
}