/* ============================================================================
   CockroachDB, explained — design system
   Dark, technical, calm. Indigo primary (a nod to Cockroach Labs' purple),
   teal for "success/consensus", amber for clocks, rose for conflict.
   ========================================================================== */

:root {
  /* palette */
  --bg:        #0b0e14;
  --bg-1:      #11151f;
  --bg-2:      #161c2a;
  --bg-3:      #1e2536;
  --line:      #29324a;
  --line-2:    #38425e;
  --ink:       #e8ecf5;
  --ink-2:     #aab3c6;
  --ink-3:     #6f7a92;

  --indigo:    #7c6cff;
  --indigo-2:  #a99bff;
  --teal:      #2fd8c3;
  --amber:     #f6b73c;
  --rose:      #ff6b81;
  --sky:       #56b6ff;
  --green:     #56d364;

  --r-sm: 6px;
  --r:    12px;
  --r-lg: 20px;
  --maxw: 1080px;

  --mono: ui-monospace, "SF Mono", "JetBrains Mono", "Cascadia Code", Menlo, Consolas, monospace;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Inter, Roboto, sans-serif;

  --shadow: 0 10px 40px -12px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* subtle grid texture */
body::before {
  content: "";
  position: fixed; inset: 0;
  background:
    radial-gradient(900px 500px at 80% -10%, rgba(124,108,255,.12), transparent 60%),
    radial-gradient(700px 400px at 0% 10%, rgba(47,216,195,.07), transparent 55%);
  pointer-events: none; z-index: 0;
}

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

h1, h2, h3 { line-height: 1.2; letter-spacing: -.02em; font-weight: 700; }
code, kbd { font-family: var(--mono); font-size: .9em; }
:not(pre) > code {
  background: var(--bg-3); border: 1px solid var(--line);
  padding: .1em .4em; border-radius: var(--r-sm); color: var(--indigo-2);
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(11,14,20,.72);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 12px 22px;
  display: flex; align-items: center; gap: 18px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: -.02em; }
.brand .bug { font-size: 22px; filter: saturate(1.2); }
.nav-links { margin-left: auto; display: flex; gap: 4px; flex-wrap: wrap; }
.nav-links a {
  color: var(--ink-2); font-size: 14px; padding: 6px 10px; border-radius: 8px;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-2); text-decoration: none; }

/* ---------- layout ---------- */
main { position: relative; z-index: 1; }
section { max-width: var(--maxw); margin: 0 auto; padding: 68px 22px; }
section + section { border-top: 1px solid var(--line); }
.lead { font-size: 1.18rem; color: var(--ink-2); max-width: 68ch; }
.kicker {
  display: inline-block; font-family: var(--mono); font-size: 12.5px;
  letter-spacing: .16em; text-transform: uppercase; color: var(--indigo-2);
  border: 1px solid var(--line-2); border-radius: 999px; padding: 4px 12px; margin-bottom: 18px;
}
h2 { font-size: clamp(1.6rem, 3.4vw, 2.3rem); margin: 0 0 12px; }
h3 { font-size: 1.15rem; margin: 26px 0 8px; }
p { color: var(--ink); }
.muted { color: var(--ink-3); }

/* ---------- hero ---------- */
.hero { padding-top: 90px; padding-bottom: 40px; text-align: left; }
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.2rem); margin: 0 0 18px;
  background: linear-gradient(120deg, #fff 20%, var(--indigo-2) 60%, var(--teal));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero .lead { font-size: 1.3rem; max-width: 60ch; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 0; }
.tag {
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-2);
  border: 1px solid var(--line-2); border-radius: 999px; padding: 5px 12px;
  background: var(--bg-1);
}
.tag b { color: var(--teal); font-weight: 600; }

/* ---------- cards / callouts ---------- */
.grid { display: grid; gap: 16px; }
.grid.two { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid.three { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.card {
  background: linear-gradient(180deg, var(--bg-1), var(--bg));
  border: 1px solid var(--line); border-radius: var(--r);
  padding: 20px 22px;
}
.card h3 { margin-top: 0; }
.card .ic { font-size: 26px; display: block; margin-bottom: 6px; }

.callout {
  border-left: 3px solid var(--indigo); background: var(--bg-1);
  border-radius: 0 var(--r) var(--r) 0; padding: 14px 18px; margin: 22px 0;
  color: var(--ink-2);
}
.callout.teal  { border-color: var(--teal); }
.callout.amber { border-color: var(--amber); }
.callout.rose  { border-color: var(--rose); }
.callout b { color: var(--ink); }

/* ---------- interactive widget shell ---------- */
.demo {
  margin: 28px 0; border: 1px solid var(--line-2); border-radius: var(--r-lg);
  background: radial-gradient(120% 120% at 100% 0%, rgba(124,108,255,.08), transparent 45%), var(--bg-1);
  box-shadow: var(--shadow); overflow: hidden;
}
.demo-head {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 18px; border-bottom: 1px solid var(--line);
}
.demo-head .title { font-weight: 700; letter-spacing: -.01em; }
.demo-head .title .dot { color: var(--teal); }
.demo-body { padding: 18px; }
.demo-controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-left: auto; }
.demo-note { padding: 10px 18px 16px; color: var(--ink-3); font-size: 14px; }

button.btn {
  font-family: var(--sans); font-size: 14px; font-weight: 600;
  color: var(--ink); background: var(--bg-3); border: 1px solid var(--line-2);
  border-radius: 8px; padding: 7px 14px; cursor: pointer; transition: .15s;
}
button.btn:hover { border-color: var(--indigo); color: #fff; }
button.btn:active { transform: translateY(1px); }
button.btn.primary { background: var(--indigo); border-color: var(--indigo); color: #fff; }
button.btn.primary:hover { filter: brightness(1.1); }
button.btn.ghost { background: transparent; }
button.btn:disabled { opacity: .4; cursor: not-allowed; }

.chip {
  font-family: var(--mono); font-size: 12px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--line-2); color: var(--ink-2);
}
.chip.on   { color: var(--green);  border-color: rgba(86,211,100,.5);  background: rgba(86,211,100,.08); }
.chip.warn { color: var(--amber);  border-color: rgba(246,183,60,.5);  background: rgba(246,183,60,.08); }
.chip.off  { color: var(--ink-3); }

canvas { display: block; width: 100%; }

/* range keyspace bar */
.stat-row { display: flex; gap: 18px; flex-wrap: wrap; margin-top: 14px; }
.stat { font-family: var(--mono); font-size: 13px; color: var(--ink-2); }
.stat b { color: var(--ink); font-size: 18px; display: block; }

/* legend */
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13px; color: var(--ink-2); }
.legend span { display: inline-flex; align-items: center; gap: 6px; }
.legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }

/* ---------- code blocks ---------- */
pre {
  background: #090c12; border: 1px solid var(--line); border-radius: var(--r);
  padding: 16px 18px; overflow-x: auto; font-family: var(--mono); font-size: 13.5px;
  line-height: 1.6; color: #cdd6e6; margin: 18px 0;
}
pre .k { color: var(--indigo-2); } /* keyword */
pre .s { color: var(--teal); }     /* string */
pre .c { color: var(--ink-3); font-style: italic; } /* comment */
pre .n { color: var(--amber); }    /* number/ident */

/* key/value mapping table */
.kv {
  font-family: var(--mono); font-size: 13px; width: 100%; border-collapse: collapse;
}
.kv td, .kv th { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.kv th { color: var(--ink-3); font-weight: 500; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.kv td:first-child { color: var(--indigo-2); }
.kv td:last-child { color: var(--teal); }

/* ---------- live panel ---------- */
.live-status { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
textarea.sql {
  width: 100%; min-height: 84px; font-family: var(--mono); font-size: 13.5px;
  background: #090c12; color: #cdd6e6; border: 1px solid var(--line-2);
  border-radius: var(--r); padding: 12px 14px; resize: vertical;
}
.result-table { width: 100%; border-collapse: collapse; font-family: var(--mono); font-size: 12.5px; margin-top: 12px; }
.result-table th { text-align: left; color: var(--indigo-2); border-bottom: 1px solid var(--line-2); padding: 6px 10px; }
.result-table td { border-bottom: 1px solid var(--line); padding: 6px 10px; color: var(--ink-2); }
.demo-select { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }

/* ---------- footer ---------- */
footer {
  max-width: var(--maxw); margin: 0 auto; padding: 40px 22px 80px;
  color: var(--ink-3); font-size: 14px; border-top: 1px solid var(--line);
}
footer a { color: var(--ink-2); }

/* progress rail */
.rail { position: fixed; top: 0; left: 0; height: 3px; background: linear-gradient(90deg, var(--indigo), var(--teal)); width: 0; z-index: 60; transition: width .1s linear; }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

@media (max-width: 640px) {
  body { font-size: 16px; }
  section { padding: 48px 18px; }
  .nav-links { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { transition: none; opacity: 1; transform: none; }
}