/* sdd — static site. Self-contained: no CDNs, no webfonts, works offline. */

:root {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --bg-code: #10151c;
  --border: #2d333b;
  --text: #d6dde4;
  --text-dim: #8b949e;
  --accent: #4ade80;      /* gate green */
  --accent2: #67c3f0;     /* stage cyan */
  --accent3: #d2a8ff;     /* awaiting purple */
  --warn: #f0b429;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
}

.wrap { max-width: 880px; margin: 0 auto; padding: 0 24px; }

/* ── nav ─────────────────────────────────────────────── */
header {
  border-bottom: 1px solid var(--border);
  background: rgba(13, 17, 23, 0.92);
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(6px);
}
nav {
  display: flex; align-items: center; gap: 22px;
  max-width: 880px; margin: 0 auto; padding: 14px 24px;
}
nav .brand {
  font-family: var(--mono); font-weight: 700; color: var(--accent);
  text-decoration: none; font-size: 15px; margin-right: auto;
}
nav .brand::before { content: "▸ "; color: var(--accent2); }
nav a { color: var(--text-dim); text-decoration: none; font-size: 14px; }
nav a:hover, nav a.active { color: var(--text); }
nav a.gh { font-family: var(--mono); font-size: 13px; }

/* visible keyboard-focus ring (site has no other focus styling) */
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--accent2); outline-offset: 2px; border-radius: 2px;
}

.nav-toggle { display: none; }
.nav-burger {
  display: none; margin-left: auto; cursor: pointer;
  width: 44px; height: 44px; align-items: center; justify-content: center;
}
.nav-burger span {
  display: block; width: 20px; height: 2px; margin: 4px 0;
  background: var(--text-dim); border-radius: 1px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.nav-toggle:focus-visible ~ .nav-burger {
  outline: 2px solid var(--accent2); outline-offset: 2px; border-radius: 6px;
}

/* ── hero ────────────────────────────────────────────── */
.hero { padding: 72px 0 40px; }
.hero h1 {
  font-family: var(--mono); font-size: 34px; line-height: 1.2;
  letter-spacing: -0.5px; margin-bottom: 16px;
}
.hero h1 em { font-style: normal; color: var(--accent); }
.hero p.lead { font-size: 19px; color: var(--text-dim); max-width: 620px; }
.hero .cta { margin-top: 28px; display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 10px 18px; border-radius: 8px;
  font-family: var(--mono); font-size: 14px; text-decoration: none;
  border: 1px solid var(--border); color: var(--text);
}
.btn.primary { background: var(--accent); border-color: var(--accent); color: #06130a; font-weight: 600; }
.btn.primary:hover { filter: brightness(1.1); }
.btn:hover { border-color: var(--text-dim); }

/* ── pipeline strip ──────────────────────────────────── */
.pipeline {
  font-family: var(--mono); font-size: 13px; color: var(--text-dim);
  background: var(--bg-code); border: 1px solid var(--border); border-radius: 10px;
  padding: 18px 22px; overflow-x: auto; white-space: pre; margin: 36px 0;
}
.pipeline b { color: var(--accent2); font-weight: 600; }
.pipeline i { color: var(--accent); font-style: normal; }

/* ── sections ────────────────────────────────────────── */
section { padding: 34px 0; }
section + section { border-top: 1px solid var(--border); }
h2 {
  font-size: 22px; margin-bottom: 14px; letter-spacing: -0.3px;
}
h2::before { content: "## "; color: var(--accent); font-family: var(--mono); font-size: 18px; }
h3 { font-size: 17px; margin: 22px 0 8px; }
p { margin: 10px 0; }
p, li { color: var(--text); }
a { color: var(--accent2); }
.dim { color: var(--text-dim); }
ul, ol { padding-left: 22px; margin: 10px 0; }
li { margin: 4px 0; }

/* ── code ────────────────────────────────────────────── */
pre {
  background: var(--bg-code); border: 1px solid var(--border); border-radius: 10px;
  padding: 16px 18px; overflow-x: auto; margin: 14px 0;
  font-size: 13.5px; line-height: 1.6;
}
code { font-family: var(--mono); font-size: 0.92em; }
p code, li code, td code {
  background: var(--bg-soft); border: 1px solid var(--border);
  border-radius: 5px; padding: 1px 6px; white-space: nowrap;
}
pre code { background: none; border: none; padding: 0; white-space: pre; }
pre .c { color: var(--text-dim); }        /* comment */
pre .g { color: var(--accent); }          /* green / success */
pre .y { color: var(--warn); }            /* yellow / prompt */
pre .b { color: var(--accent2); }         /* cyan / heading */
pre .m { color: var(--accent3); }         /* magenta / question */

/* ── cards ───────────────────────────────────────────── */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 18px 0; }
.card {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: 10px;
  padding: 18px; text-decoration: none; color: var(--text); display: block;
}
a.card:hover { border-color: var(--accent2); }
.card h3 { margin: 0 0 6px; font-size: 15.5px; }
.card h3 code { background: none; border: none; padding: 0; color: var(--accent2); }
.card p { margin: 0; font-size: 14px; color: var(--text-dim); }
.card .tag {
  display: inline-block; font-family: var(--mono); font-size: 11px;
  color: var(--accent); margin-bottom: 8px; letter-spacing: 0.4px;
}

/* ── tables ──────────────────────────────────────────── */
.tablewrap { overflow-x: auto; margin: 14px 0; }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { color: var(--text-dim); font-weight: 600; font-size: 13px; text-transform: uppercase; letter-spacing: 0.5px; }
td:first-child { font-family: var(--mono); font-size: 13.5px; white-space: nowrap; }
tr.group td { font-family: var(--mono); color: var(--accent); font-size: 12px; letter-spacing: 0.8px; text-transform: uppercase; padding-top: 18px; }

/* ── callouts ────────────────────────────────────────── */
.note {
  border-left: 3px solid var(--accent2); background: var(--bg-soft);
  border-radius: 0 8px 8px 0; padding: 12px 16px; margin: 16px 0; font-size: 14.5px;
}
.note.warn { border-left-color: var(--warn); }
.note.green { border-left-color: var(--accent); }
.note p { margin: 4px 0; }

/* ── split: text beside a figure ─────────────────────── */
.split {
  display: grid; grid-template-columns: 5fr 4fr; gap: 36px; align-items: center;
}
.split .fig { margin: 0; }
.split .fig img { width: 100%; max-width: 360px; display: block; margin: 0 auto; }
.split.rev .fig { order: -1; }
@media (max-width: 720px) {
  .split, .split.rev { grid-template-columns: 1fr; gap: 18px; }
  .split.rev .fig { order: 0; }
  .split .fig img { max-width: 320px; }
}

/* ── screenshots ─────────────────────────────────────── */
.shot { margin: 18px 0; }
.shot img { max-width: 100%; border: 1px solid var(--border); border-radius: 10px; display: block; }
.shot figcaption { font-size: 13px; color: var(--text-dim); margin-top: 6px; }

/* ── steps (walkthroughs) ────────────────────────────── */
.step { margin: 30px 0; }
.step h3 { display: flex; align-items: baseline; gap: 10px; margin-top: 0; }
.step h3 .n {
  font-family: var(--mono); color: var(--accent); font-size: 14px;
  border: 1px solid var(--border); border-radius: 6px; padding: 1px 8px; background: var(--bg-soft);
}

/* ── page header (non-home) ──────────────────────────── */
.pagehead { padding: 48px 0 8px; }
.pagehead h1 { font-size: 28px; letter-spacing: -0.4px; }
.pagehead h1 code { background: none; border: none; padding: 0; color: var(--accent2); }
.pagehead p { color: var(--text-dim); font-size: 17px; max-width: 640px; }
.crumb { font-family: var(--mono); font-size: 12.5px; color: var(--text-dim); margin-bottom: 10px; }
.crumb a { color: var(--text-dim); text-decoration: none; }
.crumb a:hover { color: var(--text); }

/* ── footer ──────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--border); margin-top: 48px;
  padding: 26px 0 40px; color: var(--text-dim); font-size: 13.5px;
}
footer .wrap { display: flex; gap: 18px; flex-wrap: wrap; }
footer a { color: var(--text-dim); }
footer a:hover { color: var(--text); }

/* ── next/prev links ─────────────────────────────────── */
.nextprev { display: flex; justify-content: space-between; gap: 12px; margin: 40px 0 8px; }
.nextprev a { font-family: var(--mono); font-size: 13.5px; text-decoration: none; }

@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  nav { gap: 14px; flex-wrap: wrap; }
  .nav-burger { display: flex; flex-direction: column; }
  nav a:not(.brand) {
    display: none; flex: 1 0 100%; padding: 8px 0;
    border-top: 1px solid var(--border);
  }
  .nav-toggle:checked ~ a:not(.brand) { display: block; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .nav-toggle:checked ~ .nav-burger span:nth-child(2) { opacity: 0; }
  .nav-toggle:checked ~ .nav-burger span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}