/* Skids Down · Rotorhead site
   One stylesheet for the landing page (dark, "night briefing") and the reading pages
   (warm paper). Tokens first, then layout, then the few components. No build step. */

:root {
  --navy-950: #050d22;
  --navy-900: #07122b;
  --navy-800: #0b1a3a;
  --navy-700: #12295c;
  --blue-600: #1f5fd0;   /* the app icon's blue */
  --blue-400: #4d8bff;
  --sky-200: #cfe3ff;
  --sky-100: #e9f1ff;
  --paper: #f6f3ec;
  --paper-2: #efeadf;
  --ink: #141a2a;
  --ink-2: #4a5268;
  --ink-3: #7b8299;
  --line: rgba(20, 26, 42, 0.12);
  --amber: #f0a63a;
  --amber-deep: #c77d12;
  --good: #3ec28f;

  --font-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-body: "Schibsted Grotesk", "Helvetica Neue", Helvetica, sans-serif;
  --font-mono: "IBM Plex Mono", "SF Mono", Menlo, monospace;

  --measure: 66ch;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 14px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
body.dark {
  color: var(--sky-100);
  background: var(--navy-900);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 4px; }

.skip { position: absolute; left: -999px; top: 8px; background: var(--amber); color: var(--ink); padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }

/* ---------- header ---------- */
.site-header {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px var(--gutter);
  max-width: 1180px; margin: 0 auto;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand img { width: 36px; height: 36px; border-radius: 9px; box-shadow: 0 2px 10px rgba(5, 13, 34, 0.35); }
.brand b { font-family: var(--font-display); font-weight: 400; font-size: 24px; letter-spacing: 0.01em; line-height: 1; }
.brand small { display: block; white-space: nowrap; font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em; text-transform: uppercase; opacity: 0.65; margin-top: 3px; }
.site-nav { display: flex; gap: clamp(14px, 3vw, 28px); font-size: 15px; }
@media (max-width: 600px) {
  .site-header { flex-wrap: wrap; row-gap: 12px; padding-top: 14px; padding-bottom: 12px; }
  .site-nav { flex-basis: 100%; font-size: 14.5px; gap: 18px; }
  .brand b { font-size: 22px; }
}
.site-nav a { text-decoration: none; opacity: 0.8; padding: 4px 0; border-bottom: 1px solid transparent; }
.site-nav a:hover, .site-nav a[aria-current="page"] { opacity: 1; border-bottom-color: currentColor; }

/* ---------- reading pages ---------- */
.doc { max-width: 760px; margin: 0 auto; padding: 24px var(--gutter) 80px; }
.doc-head { padding: 24px 0 28px; border-bottom: 1px solid var(--line); margin-bottom: 36px; }
.eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 10px; }
body.dark .eyebrow { color: var(--sky-200); opacity: 0.7; }
.doc h1 { font-family: var(--font-display); font-weight: 400; font-size: clamp(38px, 6vw, 56px); line-height: 1.05; margin: 0 0 12px; letter-spacing: -0.01em; }
.doc-head p { margin: 0; color: var(--ink-2); max-width: var(--measure); }
.doc h2 { font-family: var(--font-display); font-weight: 400; font-size: 30px; line-height: 1.15; margin: 44px 0 12px; }
.doc h3 { font-size: 18px; margin: 28px 0 8px; }
.doc p, .doc li { max-width: var(--measure); }
.doc p { margin: 0 0 16px; }
.doc ul, .doc ol { padding-left: 22px; margin: 0 0 18px; }
.doc li { margin-bottom: 6px; }
.doc li::marker { color: var(--blue-600); }
.doc a { color: var(--blue-600); text-decoration-thickness: 1px; text-underline-offset: 3px; }
.doc table { border-collapse: collapse; width: 100%; margin: 8px 0 24px; font-size: 15px; }
.doc th, .doc td { text-align: left; vertical-align: top; padding: 10px 10px 10px 0; border-bottom: 1px solid var(--line); }
.doc th { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
@media (max-width: 640px) {
  .doc table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .doc th, .doc td { min-width: 140px; padding-right: 14px; }
  .doc th:first-child, .doc td:first-child { min-width: 170px; }
}
.doc code { font-family: var(--font-mono); font-size: 0.9em; background: var(--paper-2); padding: 1px 5px; border-radius: 4px; }
.summary {
  background: var(--sky-100); border: 1px solid rgba(31, 95, 208, 0.25);
  border-left: 4px solid var(--blue-600); border-radius: var(--radius);
  padding: 18px 20px; margin: 0 0 28px;
}
.summary p:last-child, .summary ul:last-child { margin-bottom: 0; }
.toc { font-size: 15px; columns: 2; column-gap: 32px; margin: 0 0 8px; padding-left: 20px; }
@media (max-width: 560px) { .toc { columns: 1; } }
.doc .meta { font-family: var(--font-mono); font-size: 13px; color: var(--ink-3); }
.steps li { margin-bottom: 10px; }
details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin: 0 0 10px; max-width: var(--measure); }
summary { cursor: pointer; font-weight: 600; }
details p:last-child { margin-bottom: 0; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 28px var(--gutter) 40px;
  max-width: 1180px; margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 12px 28px; align-items: baseline; justify-content: space-between;
  font-size: 14px; color: var(--ink-3);
}
body.dark .site-footer { border-top-color: rgba(207, 227, 255, 0.14); color: rgba(207, 227, 255, 0.6); }
.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer .legal-line { flex-basis: 100%; font-size: 13px; max-width: 70ch; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font: 600 15px/1 var(--font-body);
  padding: 14px 20px; border-radius: 999px; text-decoration: none;
  border: 1px solid transparent; cursor: pointer; transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s;
}
.btn:hover { transform: translateY(-1px); }
.btn-amber { background: var(--amber); color: var(--navy-950); box-shadow: 0 8px 24px rgba(240, 166, 58, 0.3); }
.btn-amber:hover { background: #ffb64e; }
.btn-ghost { background: transparent; color: var(--sky-100); border-color: rgba(207, 227, 255, 0.35); }
.btn-ghost:hover { border-color: rgba(207, 227, 255, 0.8); }
.btn-ink { background: var(--ink); color: var(--paper); }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}