/* Clustro website — developer theme. Dark by default, light when the OS asks for it. */

:root {
  --bg: #0d1117;
  --bg-raised: #161b22;
  --bg-code: #010409;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #3fb950;
  --accent-2: #58a6ff;
  --warn: #d29922;
  --prompt: #3fb950;
  --comment: #6e7681;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --radius: 8px;
  --max: 880px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #ffffff;
    --bg-raised: #f6f8fa;
    --bg-code: #0d1117;
    --border: #d0d7de;
    --text: #1f2328;
    --text-dim: #59636e;
    --accent: #1a7f37;
    --accent-2: #0969da;
    --warn: #9a6700;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 16px; }

/* ---------- Header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.brand {
  font-family: var(--mono);
  font-weight: 700;
  font-size: 18px;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand .caret { color: var(--accent); }

.nav { display: flex; gap: 4px; }
.nav a {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 6px;
}
.nav a:hover { color: var(--text); background: var(--bg-raised); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); background: var(--bg-raised); }
.nav a[aria-current="page"]::before { content: "./"; color: var(--accent); }

/* ---------- Typography ---------- */

h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
h1 { font-size: clamp(30px, 6vw, 44px); margin: 0 0 12px; }
h2 {
  font-family: var(--mono);
  font-size: 22px;
  margin: 56px 0 12px;
  padding-top: 8px;
}
h2 .num { color: var(--accent); margin-right: 8px; }
h3 { font-size: 17px; margin: 28px 0 8px; }

p { margin: 0 0 14px; }
.lead { font-size: 19px; color: var(--text-dim); max-width: 640px; }
.dim { color: var(--text-dim); }

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------- Hero ---------- */

.hero { padding: 64px 0 24px; }
.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--warn);
  border: 1px solid var(--warn);
  border-radius: 999px;
  padding: 2px 10px;
  margin-bottom: 18px;
}
.tagline {
  font-family: var(--mono);
  color: var(--accent);
  font-size: 15px;
  margin-bottom: 8px;
}

/* ---------- Terminal / code blocks ---------- */

.term {
  position: relative;
  background: var(--bg-code);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin: 14px 0 20px;
  overflow: hidden;
}
.term-bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-bottom: 1px solid #21262d;
  background: #0d1117;
}
.term-bar .dot { width: 10px; height: 10px; border-radius: 50%; background: #30363d; }
.term-bar .title {
  margin-left: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: #8b949e;
}
.term pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 14px;
  line-height: 1.6;
  color: #e6edf3;
}
.term pre code { background: none; border: 0; padding: 0; font-size: inherit; }
.term .p { color: var(--prompt); user-select: none; }
.term .c { color: var(--comment); }
.term .o { color: #8b949e; }
.term .k { color: #ff7b72; }
.term .s { color: #a5d6ff; }

.copy {
  position: absolute;
  top: 5px;
  right: 8px;
  font-family: var(--mono);
  font-size: 12px;
  color: #8b949e;
  background: #21262d;
  border: 1px solid #30363d;
  border-radius: 6px;
  padding: 3px 10px;
  cursor: pointer;
}
.copy:hover { color: #e6edf3; border-color: #8b949e; }
.copy.done { color: #3fb950; border-color: #3fb950; }

/* ---------- Tabs (OS picker) ---------- */

.tabs { display: flex; gap: 4px; margin-top: 16px; flex-wrap: wrap; }
.tabs button {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 5px 12px;
  cursor: pointer;
}
.tabs button[aria-selected="true"] { color: var(--text); background: var(--bg-raised); border-color: var(--accent); }
.tab-panel[hidden] { display: none; }

/* ---------- Callouts, tables, cards ---------- */

.note {
  border-left: 3px solid var(--accent-2);
  background: var(--bg-raised);
  padding: 10px 14px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 14px 0 20px;
  font-size: 15px;
}
.note.warn { border-left-color: var(--warn); }
.note p:last-child { margin-bottom: 0; }

.table-wrap { overflow-x: auto; margin: 12px 0 20px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-family: var(--mono); font-size: 13px; color: var(--text-dim); font-weight: 600; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px;
  margin: 16px 0 8px;
}
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--bg-raised);
}
.card h3 { margin: 0 0 6px; font-family: var(--mono); font-size: 15px; }
.card p { margin: 0; color: var(--text-dim); font-size: 15px; }

.toc {
  font-family: var(--mono);
  font-size: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin: 24px 0 8px;
}
.toc ol { margin: 0; padding-left: 20px; }
.toc li { margin: 2px 0; }

/* ---------- Story page ---------- */

.prose { max-width: 680px; }
.prose p, .prose li { font-size: 17px; }
.prose h2 { font-family: var(--sans); font-size: 24px; }
.prose blockquote {
  margin: 24px 0;
  padding: 4px 18px;
  border-left: 3px solid var(--accent);
  color: var(--text-dim);
  font-size: 19px;
  font-style: italic;
}
.checklist { list-style: none; padding-left: 0; font-family: var(--mono); font-size: 15px; }
.checklist li::before { content: "→ "; color: var(--accent); }

/* ---------- Footer ---------- */

.site-footer {
  margin-top: 80px;
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  font-size: 14px;
  color: var(--text-dim);
}
.site-footer .wrap { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.site-footer .mono { font-family: var(--mono); }

@media (max-width: 520px) {
  .brand { font-size: 16px; }
  .nav a { padding: 6px 8px; font-size: 13px; }
  .term pre { font-size: 13px; padding: 14px; }
}