/* culebra brand system — shared by the landing page and the playground.
   Sky-blue accent on a warm neutral ground; light + dark aware. */

:root {
  /* palette — light */
  --bg: #f7f5ef;
  --surface: #fffdf8;
  --surface-2: #f2efe6;
  --text: #1a201d;
  --muted: #6c736d;
  --border: #e5e0d4;
  --brand: #1590c4;
  --brand-strong: #0f6f9c;
  --brand-soft: #e3f2f9;
  --accent: #c06a38;
  --code-bg: #f3f0e8;
  --danger: #b23b3b;

  --font-ui: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  --radius: 8px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.05), 0 4px 16px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1512;
    --surface: #161d19;
    --surface-2: #1b231e;
    --text: #e7ece9;
    --muted: #98a19b;
    --border: #243029;
    --brand: #45b8ee;
    --brand-strong: #74cbf4;
    --brand-soft: #122530;
    --accent: #e08a55;
    --code-bg: #141a17;
    --danger: #e06a6a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 20px rgba(0, 0, 0, 0.25);
  }
}

/* explicit theme override wins over the media query in both directions */
:root[data-theme="light"] {
  --bg: #f7f5ef; --surface: #fffdf8; --surface-2: #f2efe6; --text: #1a201d;
  --muted: #6c736d; --border: #e5e0d4; --brand: #1590c4; --brand-strong: #0f6f9c;
  --brand-soft: #e3f2f9; --accent: #c06a38; --code-bg: #f3f0e8; --danger: #b23b3b;
}
:root[data-theme="dark"] {
  --bg: #0f1512; --surface: #161d19; --surface-2: #1b231e; --text: #e7ece9;
  --muted: #98a19b; --border: #243029; --brand: #45b8ee; --brand-strong: #74cbf4;
  --brand-soft: #122530; --accent: #e08a55; --code-bg: #141a17; --danger: #e06a6a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-ui);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  /* Off, or WebKit inflates text on rotation to landscape and the two pages
     disagree with the sizes their media queries were written against. */
  -webkit-text-size-adjust: 100%;
}

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

code, pre { font-family: var(--font-mono); }
code { background: var(--code-bg); color: var(--text); padding: 0.1em 0.4em; border-radius: 4px; }
/* Source order puts this after the bare `code` rule above, so a linked
   `<code>` (e.g. tool names in the "One executable" section) keeps
   reading as a link instead of falling back to plain text color. */
a code { color: inherit; }

/* --- wordmark (logo) --------------------------------------------------- */
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--text);
}
.wordmark svg { display: block; }
.wordmark .mark { color: var(--brand); }

/* --- buttons ----------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.12s ease, border-color 0.12s ease, transform 0.05s ease;
}
.btn:hover { text-decoration: none; border-color: var(--brand); }
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--brand);
  border-color: var(--brand);
  color: #fff;
}
.btn-primary:hover { background: var(--brand-strong); border-color: var(--brand-strong); }
:root[data-theme="dark"] .btn-primary,
:root:not([data-theme="light"]) .btn-primary { color: #08130d; }