/* Heardlist — shared tokens + base.
   World: amateur-radio QSL cards. A heard list of relay stations.
   Cobalt field, signal-yellow stamp, cool paper, ink-navy type. */

:root {
  --cobalt: #1b2ce0;
  --cobalt-deep: #121ca8;
  --cobalt-ink: #0a0f3a;
  --ink: #0a0f3a;
  --ink-soft: #3a4170;
  --paper: #f3f5ff;
  --paper-2: #e6eaff;
  --card: #fbfcff;
  --signal: #ffd60a;
  --signal-ink: #3d3200;
  --rule: #c9d0f5;
  --ok: #0a7a4b;
  --warn-bg: #fff3b0;

  --font-display: "Bricolage Grotesque", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Hanken Grotesk", "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --pad: clamp(1.25rem, 4vw, 3rem);
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5.5rem; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration-thickness: 1px; text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }
h1, h2, h3 { font-family: var(--font-display); text-wrap: balance; margin: 0; line-height: 1.05; letter-spacing: -0.02em; }
p { margin: 0 0 1em; text-wrap: pretty; }
code, kbd, pre, samp { font-family: var(--font-mono); font-size: 0.875em; }
button { font: inherit; color: inherit; cursor: pointer; }
.num, td.num, .tnum { font-variant-numeric: tabular-nums; }

/* Browser surfaces that belong to the design */
::selection { background: var(--signal); color: var(--ink); }
:focus-visible { outline: 3px solid var(--signal); outline-offset: 3px; border-radius: 2px; }
.on-paper :focus-visible, .docs-main :focus-visible { outline-color: var(--cobalt); }
input, select { caret-color: var(--cobalt); accent-color: var(--cobalt); }
* { scrollbar-color: var(--cobalt) var(--paper-2); scrollbar-width: thin; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--paper-2); }
::-webkit-scrollbar-thumb { background: var(--cobalt); border-radius: 0; }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 1rem; top: -4rem; background: var(--signal); color: var(--ink); padding: 0.6rem 1rem; z-index: 99; font-weight: 700; transition: top 0.2s var(--ease); }
.skip:focus { top: 1rem; }

/* Brand mark: a call-sign slug */
.brand { display: inline-flex; align-items: center; gap: 0.6rem; font-family: var(--font-display); font-weight: 800; font-size: 1.25rem; letter-spacing: -0.03em; text-decoration: none; }
.brand-mark { width: 1.75rem; height: 1.75rem; flex: none; }

.btn {
  display: inline-flex; align-items: center; gap: 0.6rem;
  padding: 0.85rem 1.35rem; border: 2px solid currentColor; background: transparent;
  font-weight: 700; text-decoration: none; letter-spacing: -0.005em;
  transition: transform 0.25s var(--ease), background 0.2s, color 0.2s, box-shadow 0.25s var(--ease);
}
.btn:hover { transform: translateY(-2px); text-decoration: none; }
.btn:active { transform: translateY(0); }
.btn-signal { background: var(--signal); border-color: var(--signal); color: var(--ink); box-shadow: 0 10px 24px -10px rgba(0, 0, 0, 0.45); }
.btn-signal:hover { box-shadow: 0 14px 28px -10px rgba(0, 0, 0, 0.55); }

.wrap { max-width: 1180px; margin: 0 auto; padding-inline: var(--pad); }

/* ---------- Masthead with tuning dial ---------- */
.top { position: sticky; top: 0; z-index: 20; background: var(--cobalt); color: #fff; padding-top: env(safe-area-inset-top, 0px); }
.top-in { max-width: 1180px; margin: 0 auto; padding: 0.8rem var(--pad) 0.9rem; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.top nav { white-space: nowrap; display: flex; align-items: center; gap: clamp(0.9rem, 2.4vw, 1.9rem); font-weight: 600; font-size: 0.97rem; }
.top nav a { text-decoration: none; padding: 0.25rem 0; border-bottom: 2px solid transparent; transition: border-color 0.2s; }
.top nav a:hover { border-color: var(--signal); }
.top nav .nav-docs { background: var(--signal); color: var(--ink); padding: 0.4rem 0.9rem; border: 0; font-weight: 700; }
.top nav .nav-docs:hover { background: #fff; }
.dial {
  position: relative; height: 14px;
  background:
    repeating-linear-gradient(90deg, rgba(255,255,255,0.7) 0 1px, transparent 1px 50px) left bottom / 100% 14px no-repeat,
    repeating-linear-gradient(90deg, rgba(255,255,255,0.4) 0 1px, transparent 1px 10px) left bottom / 100% 7px no-repeat;
}
.needle { position: absolute; bottom: 0; left: calc(var(--p, 0) * 100%); width: 3px; height: 18px; margin-left: -1.5px; background: var(--signal); box-shadow: 0 0 0 1px var(--cobalt); }

.foot { background: var(--cobalt-ink); color: #c5cbf5; padding: 2.5rem 0 calc(2.5rem + env(safe-area-inset-bottom, 0px)); font-size: 0.9rem; }
.foot p { max-width: 46rem; margin: 0 0 0.9rem; }
.foot a { color: #fff; }


@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}