/* ============================================================
   OpenBW Codex — design system
   A dark, sci-fi "engine teardown" aesthetic.
   ============================================================ */

:root {
  /* base palette */
  --bg:            #05070d;
  --bg-2:          #0a0e18;
  --panel:         #0d1322;
  --panel-2:       #111a2e;
  --line:          #1d2942;
  --line-soft:     #16203a;
  --text:          #c8d4ee;
  --text-dim:      #7f8fb3;
  --text-faint:    #4f5d7e;

  /* accents — drawn from the three races + UI gold */
  --terran:        #e0922f;   /* tan / orange */
  --zerg:          #b65cff;   /* organic violet */
  --protoss:       #ffd75e;   /* psi gold */
  --cyan:          #3fd9ff;   /* console blue */
  --green:         #57e08a;
  --red:           #ff5d6c;

  --accent:        var(--cyan);

  --mono: "SFMono-Regular", "JetBrains Mono", "Fira Code", ui-monospace, Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --maxw: 1120px;
  --radius: 14px;
  --shadow: 0 24px 60px -20px rgba(0,0,0,.7);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* starfield backdrop */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(1200px 700px at 80% -10%, rgba(63,217,255,.10), transparent 60%),
    radial-gradient(900px 600px at 5% 5%, rgba(182,92,255,.10), transparent 55%),
    radial-gradient(800px 800px at 50% 120%, rgba(224,146,47,.08), transparent 60%);
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    radial-gradient(1px 1px at 20% 30%, rgba(255,255,255,.7), transparent),
    radial-gradient(1px 1px at 60% 70%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 80% 10%, rgba(255,255,255,.6), transparent),
    radial-gradient(1px 1px at 35% 85%, rgba(255,255,255,.4), transparent),
    radial-gradient(1px 1px at 90% 50%, rgba(255,255,255,.5), transparent),
    radial-gradient(1px 1px at 10% 60%, rgba(255,255,255,.35), transparent);
  background-repeat: repeat;
  background-size: 480px 480px;
  opacity: .5;
  animation: drift 240s linear infinite;
}
@keyframes drift { to { background-position: 480px 480px; } }

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

/* ---------- layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.narrow { max-width: 780px; }

section { padding: 64px 0; }
section.tight { padding: 36px 0; }

/* ---------- top nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(5,7,13,.72);
  border-bottom: 1px solid var(--line-soft);
}
.nav .wrap { display: flex; align-items: center; gap: 18px; height: 58px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: .5px; color: var(--text); }
.brand .logo {
  width: 26px; height: 26px; border-radius: 6px;
  background: linear-gradient(135deg, var(--cyan), var(--zerg));
  box-shadow: 0 0 16px rgba(63,217,255,.5);
  display: grid; place-items: center; font-size: 13px; font-weight: 800; color: #04111a;
}
.brand small { color: var(--text-faint); font-weight: 500; letter-spacing: 0; }
.nav-links { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: var(--text-dim); padding: 6px 11px; border-radius: 8px;
  font-size: 13.5px; font-weight: 500; transition: .15s;
}
.nav-links a:hover { color: var(--text); background: var(--panel-2); text-decoration: none; }
.nav-links a.active { color: var(--cyan); background: rgba(63,217,255,.08); }
.nav-toggle { display: none; }

/* ---------- hero ---------- */
.hero { padding: 120px 0 80px; text-align: center; position: relative; }
.eyebrow {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--cyan); margin-bottom: 18px;
}
.hero h1 {
  font-size: clamp(40px, 7vw, 84px); line-height: 1.02; margin: 0 0 22px;
  font-weight: 800; letter-spacing: -1.5px;
  background: linear-gradient(180deg, #fff, #7fa6d8);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lede { font-size: clamp(17px, 2.4vw, 21px); color: var(--text-dim); max-width: 640px; margin: 0 auto 36px; }

h1, h2, h3, h4 { color: var(--text); }
h2 { font-size: clamp(26px, 4vw, 38px); letter-spacing: -.5px; margin: 0 0 8px; }
h3 { font-size: 21px; margin: 32px 0 8px; letter-spacing: -.3px; }
.section-kicker { font-family: var(--mono); font-size: 12px; letter-spacing: 2.5px; text-transform: uppercase; color: var(--accent); margin-bottom: 6px; }
.section-lede { color: var(--text-dim); font-size: 18px; max-width: 720px; margin: 0 0 8px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 15px;
  border: 1px solid var(--line); color: var(--text); background: var(--panel-2);
  cursor: pointer; transition: .18s; text-decoration: none;
}
.btn:hover { border-color: var(--cyan); box-shadow: 0 0 24px -6px rgba(63,217,255,.5); text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: linear-gradient(135deg, var(--cyan), #2aa7d6); color: #03121a; border: none; }
.btn-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ---------- chapter cards ---------- */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.card {
  display: block; position: relative; overflow: hidden;
  background: linear-gradient(180deg, var(--panel), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: .2s; color: var(--text); text-decoration: none;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--shadow); text-decoration: none; }
.card .idx { font-family: var(--mono); font-size: 12px; color: var(--text-faint); letter-spacing: 1px; }
.card h3 { margin: 6px 0 8px; font-size: 20px; }
.card p { margin: 0; color: var(--text-dim); font-size: 14.5px; }
.card .tag { position: absolute; top: 18px; right: 18px; font-size: 22px; opacity: .35; }
.card::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
  background: var(--accent); opacity: .8;
}
.card.terran::before { background: var(--terran); } .card.terran:hover { border-color: var(--terran); }
.card.zerg::before { background: var(--zerg); } .card.zerg:hover { border-color: var(--zerg); }
.card.protoss::before { background: var(--protoss); } .card.protoss:hover { border-color: var(--protoss); }
.card.cyan::before { background: var(--cyan); }

/* ---------- panels / prose blocks ---------- */
.panel {
  background: var(--panel); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px; margin: 24px 0;
}
.panel.glow { box-shadow: var(--shadow); }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.grid-2 > * { min-width: 0; }
@media (max-width: 760px){ .grid-2 { grid-template-columns: 1fr; } }

.prose p { color: var(--text); font-size: 16.5px; }
.prose .narrow { margin: 0 auto; }
.lead { font-size: 19px; color: var(--text); }

/* bullet lists — cyan markers, breathable */
ul.blist { list-style: none; padding: 0; margin: 18px 0; }
ul.blist li { position: relative; padding: 7px 0 7px 26px; color: var(--text); font-size: 16px; border-bottom: 1px solid var(--line-soft); }
ul.blist li:last-child { border-bottom: none; }
ul.blist li::before { content: "▸"; position: absolute; left: 2px; top: 7px; color: var(--accent); font-size: 13px; }
ul.blist li b { color: #fff; }
ul.blist.zerg li::before { color: var(--zerg); }
ul.blist.terran li::before { color: var(--terran); }
.dd-body ul { margin: 12px 0; padding-left: 20px; }
.dd-body li { margin: 5px 0; }

/* ---------- callouts ---------- */
.note {
  border-left: 3px solid var(--accent); background: rgba(63,217,255,.05);
  padding: 14px 18px; border-radius: 0 10px 10px 0; margin: 20px 0; font-size: 15px; color: var(--text-dim);
}
.note b { color: var(--text); }
.note.zerg { border-color: var(--zerg); background: rgba(182,92,255,.06); }
.note.terran { border-color: var(--terran); background: rgba(224,146,47,.06); }
.note.warn { border-color: var(--red); background: rgba(255,93,108,.06); }

/* ---------- code ---------- */
pre, code { font-family: var(--mono); }
code { background: var(--panel-2); padding: 2px 6px; border-radius: 5px; font-size: .9em; color: var(--cyan); }
pre {
  background: #070b14; border: 1px solid var(--line); border-radius: 12px;
  padding: 18px 20px; overflow-x: auto; font-size: 13px; line-height: 1.6; margin: 18px 0;
}
pre code { background: none; padding: 0; color: var(--text); }
pre .c { color: var(--text-faint); font-style: italic; } /* comment */
pre .k { color: var(--zerg); }   /* keyword */
pre .t { color: var(--cyan); }   /* type */
pre .n { color: var(--terran); } /* number */
pre .s { color: var(--green); }  /* string */
pre .f { color: var(--protoss); }/* function */
.codecap { font-family: var(--mono); font-size: 11.5px; color: var(--text-faint); margin: -10px 0 18px; }

/* ---------- stats ---------- */
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 16px; margin: 28px 0; }
.stat { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; text-align: center; }
.stat .v { font-family: var(--mono); font-size: 30px; font-weight: 700; color: var(--cyan); line-height: 1; }
.stat .l { font-size: 12.5px; color: var(--text-dim); margin-top: 8px; letter-spacing: .3px; }

/* ---------- timeline ---------- */
.timeline { position: relative; margin: 30px 0; padding-left: 30px; }
.timeline::before { content:""; position:absolute; left: 7px; top: 6px; bottom: 6px; width: 2px; background: linear-gradient(var(--cyan), var(--zerg)); }
.tl-item { position: relative; margin-bottom: 28px; }
.tl-item::before { content:""; position:absolute; left:-30px; top: 4px; width: 16px; height: 16px; border-radius: 50%; background: var(--bg); border: 2px solid var(--cyan); box-shadow: 0 0 12px rgba(63,217,255,.6); }
.tl-item .yr { font-family: var(--mono); font-size: 13px; color: var(--cyan); font-weight: 700; }
.tl-item h4 { margin: 2px 0 6px; font-size: 17px; }
.tl-item p { margin: 0; color: var(--text-dim); font-size: 14.5px; }

/* ---------- interactive widget shell ---------- */
.demo {
  background: linear-gradient(180deg, #0b1120, #070b14);
  border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; margin: 28px 0;
}
.demo .demo-head { display: flex; align-items: center; gap: 10px; margin-bottom: 6px; }
.demo .demo-head .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
.demo .demo-title { font-family: var(--mono); font-size: 13px; letter-spacing: 1px; color: var(--text); text-transform: uppercase; }
.demo .demo-sub { color: var(--text-faint); font-size: 13px; margin: 0 0 18px; }
.controls { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; margin: 16px 0; }
.controls label { font-size: 13px; color: var(--text-dim); display: flex; align-items: center; gap: 8px; }
input[type=range] { accent-color: var(--cyan); }
button.ctl { font-family: var(--mono); font-size: 13px; padding: 7px 14px; background: var(--panel-2); border: 1px solid var(--line); color: var(--text); border-radius: 8px; cursor: pointer; transition: .15s; }
button.ctl:hover { border-color: var(--cyan); color: var(--cyan); }
button.ctl:active { transform: scale(.97); }
.readout { font-family: var(--mono); font-size: 13px; color: var(--text-dim); }
.readout b { color: var(--cyan); }

/* ---------- detail / accordion (deeper & deeper) ---------- */
details.dd {
  border: 1px solid var(--line); border-radius: 12px; margin: 14px 0; overflow: hidden; background: var(--panel);
}
details.dd > summary {
  cursor: pointer; padding: 16px 20px; font-weight: 600; list-style: none; display: flex; align-items: center; gap: 12px;
  color: var(--text); transition: .15s;
}
details.dd > summary:hover { background: var(--panel-2); }
details.dd > summary::-webkit-details-marker { display: none; }
details.dd > summary::before { content: "▸"; color: var(--accent); transition: .2s; font-size: 13px; }
details.dd[open] > summary::before { transform: rotate(90deg); }
details.dd > summary .badge { margin-left: auto; font-family: var(--mono); font-size: 11px; color: var(--text-faint); }
details.dd .dd-body { padding: 4px 20px 20px; color: var(--text-dim); border-top: 1px solid var(--line-soft); }
details.dd .dd-body p:first-child { margin-top: 14px; }

/* ---------- tables ---------- */
table.bw { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 14px; }
table.bw th, table.bw td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line-soft); }
table.bw th { color: var(--text-faint); font-family: var(--mono); font-size: 11.5px; letter-spacing: 1px; text-transform: uppercase; font-weight: 600; }
table.bw td code { font-size: 12.5px; }
table.bw tr:hover td { background: rgba(255,255,255,.015); }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--line-soft); padding: 40px 0; color: var(--text-faint); font-size: 13.5px; }
footer .wrap { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
footer a { color: var(--text-dim); }

/* ---------- page header for chapter pages ---------- */
.page-head { padding: 70px 0 30px; border-bottom: 1px solid var(--line-soft); }
.crumbs { font-family: var(--mono); font-size: 12px; color: var(--text-faint); margin-bottom: 14px; }
.crumbs a { color: var(--text-dim); }
.page-head h1 { font-size: clamp(34px, 6vw, 56px); letter-spacing: -1px; margin: 0 0 14px; line-height: 1.05; }
.page-head .page-lede { font-size: 19px; color: var(--text-dim); max-width: 720px; }

/* prev/next */
.pager { display: flex; justify-content: space-between; gap: 16px; margin: 50px 0 10px; flex-wrap: wrap; }
.pager a { flex: 1 1 240px; border: 1px solid var(--line); border-radius: 12px; padding: 18px 20px; background: var(--panel); transition: .18s; }
.pager a:hover { border-color: var(--cyan); text-decoration: none; transform: translateY(-2px); }
.pager .dir { font-family: var(--mono); font-size: 11px; color: var(--text-faint); letter-spacing: 1px; }
.pager .ttl { color: var(--text); font-weight: 600; margin-top: 4px; }
.pager .next { text-align: right; }

/* progress bar */
.progress { position: fixed; top: 0; left: 0; height: 2px; background: linear-gradient(90deg, var(--cyan), var(--zerg)); z-index: 60; width: 0; }

/* utility */
.mono { font-family: var(--mono); }
.dim { color: var(--text-dim); }
.center { text-align: center; }
.kbd { font-family: var(--mono); font-size: 12px; background: var(--panel-2); border: 1px solid var(--line); border-bottom-width: 2px; border-radius: 5px; padding: 2px 7px; }
hr.sep { border: none; border-top: 1px solid var(--line-soft); margin: 44px 0; }

@media (max-width: 720px){
  .nav-links { display: none; position: absolute; top: 58px; left: 0; right: 0; flex-direction: column; background: var(--bg-2); padding: 12px; border-bottom: 1px solid var(--line); }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; margin-left: auto; }
  .grid-2 { grid-template-columns: 1fr; }
}

/* fade-in on scroll */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity .6s, transform .6s; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal { opacity:1; transform:none; } body::after { animation: none; } }