/* Farsquint design tokens + shared chrome (nav, theme toggle, footer, buttons, badges, map theming).
   Loaded by every page. landing.css and app.css only add page layout; colours and fonts live here.
   Direction: ground station. Orbital imagery read off a quiet instrument: deep space ink (dark) or
   clean survey white (light), one luminous ice-blue accent, hairline glass panels with HUD corner ticks,
   a high-contrast serif for headlines and mono for every number, label and coordinate. */

@import url("https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Sora:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500;600&display=swap");

/* ------------------------------------------------------------------ light (default) */
:root {
  --paper: #f3f5f9;          /* page */
  --sheet: #ffffff;          /* solid panels, popovers */
  --sheet-2: #e9edf4;        /* inset wells, map placeholder, stripes */
  --glass: rgba(255, 255, 255, .8);  /* translucent panels over the page */
  --field: #ffffff;          /* inputs */
  --ink: #0a1020;            /* headlines, primary text */
  --ink-2: #364155;          /* body */
  --ink-3: #5a6478;          /* captions, labels (5.3:1 on --paper) */
  --rule: #dde2eb;           /* hairlines */
  --rule-strong: #b9c2d0;    /* framed panels, inputs */
  --grid: rgba(10, 16, 32, .05);
  --tick: #0a1020;           /* HUD corner ticks */

  --accent: #0a62d0;         /* the one accent */
  --accent-ink: #0750ad;     /* accent text (AA small) */
  --accent-wash: #e3eeff;
  --on-accent: #ffffff;
  --glow: rgba(10, 98, 208, .16);
  --signal: #c25e00;         /* target reticle only */

  --ok: #12704a;  --ok-wash: #dcf1e7;
  --warn: #8a5700; --warn-wash: #f8ecd2;
  --burn: #b3261e; --burn-wash: #fbe2df;

  --shadow: 0 1px 0 rgba(10, 16, 32, .03), 0 18px 40px -28px rgba(10, 30, 70, .35);
  --page-glow: radial-gradient(1100px 520px at 78% -8%, rgba(10, 98, 208, .08), transparent 62%),
               radial-gradient(700px 420px at -5% 18%, rgba(0, 140, 190, .05), transparent 60%);
  --map-bg: #b2ced6;
  --tile-filter: saturate(.7) contrast(.97);

  /* type */
  --font-display: "Instrument Serif", "Iowan Old Style", Georgia, serif;
  --font-ui: "Sora", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --fs-xs: 0.75rem;
  --fs-sm: 0.8125rem;
  --fs-base: 0.9375rem;
  --fs-md: 1.0625rem;
  --fs-lg: 1.6rem;
  --fs-xl: clamp(2.2rem, 1.4rem + 2.4vw, 3.2rem);
  --fs-hero: clamp(2.7rem, 1.5rem + 3.6vw, 4.5rem);
  --fs-num: 1.5rem;

  --lh-tight: 1;
  --lh-snug: 1.3;
  --lh-body: 1.6;
  --tracking-label: 0.14em;

  --s-1: 4px; --s-2: 8px; --s-3: 12px; --s-4: 16px; --s-5: 24px; --s-6: 32px; --s-7: 48px; --s-8: 72px; --s-9: 104px;
  --gutter: clamp(16px, 3vw, 36px);
  --maxw: 1280px;

  --r-0: 0;
  --r-1: 4px;     /* buttons, inputs, chips */
  --r-2: 8px;     /* panels */
  --bw: 1px;
  --border: var(--bw) solid var(--rule);
  --border-strong: var(--bw) solid var(--rule-strong);

  --focus: 0 0 0 2px var(--paper), 0 0 0 4px var(--accent);

  --ease: cubic-bezier(.2, .7, .2, 1);
  --dur: 180ms;

  --z-nav: 1100;
  --z-toast: 1200;

  color-scheme: light;

  /* Bridge for the app's component names (round panel, app pages). */
  --ap-bg: var(--paper); --ap-panel: var(--glass); --ap-ink: var(--ink); --ap-mute: var(--ink-3); --ap-rule: var(--rule);
  --ap-accent: var(--accent); --ap-link: var(--accent-ink); --ap-ok: var(--ok); --ap-warn: var(--warn); --ap-burn: var(--burn);
  --ap-serif: var(--font-display); --ap-sans: var(--font-ui); --ap-mono: var(--font-mono);
  --ap-w: var(--maxw);
}

/* ------------------------------------------------------------------ dark */
:root[data-theme="dark"] {
  --paper: #05070d;
  --sheet: #0c111c;
  --sheet-2: #121a29;
  --glass: rgba(13, 19, 32, .68);
  --field: #080c15;
  --ink: #edf2fb;
  --ink-2: #b4bed0;
  --ink-3: #8691a7;
  --rule: rgba(150, 178, 230, .13);
  --rule-strong: rgba(150, 178, 230, .27);
  --grid: rgba(140, 175, 235, .05);
  --tick: #a8e6ff;

  --accent: #7fd8ff;
  --accent-ink: #a6e5ff;
  --accent-wash: rgba(127, 216, 255, .1);
  --on-accent: #03111c;
  --glow: rgba(127, 216, 255, .28);
  --signal: #ffb65c;

  --ok: #5ee0a6;  --ok-wash: rgba(94, 224, 166, .11);
  --warn: #f3c46a; --warn-wash: rgba(243, 196, 106, .11);
  --burn: #ff8474; --burn-wash: rgba(255, 132, 116, .11);

  --shadow: 0 0 0 1px rgba(0, 0, 0, .2), 0 24px 60px -30px rgba(0, 0, 0, .9);
  --page-glow: radial-gradient(1100px 560px at 78% -12%, rgba(70, 140, 255, .15), transparent 62%),
               radial-gradient(760px 460px at -8% 14%, rgba(127, 216, 255, .07), transparent 60%);
  --map-bg: #313d45;
  --tile-filter: invert(1) hue-rotate(195deg) brightness(.92) contrast(.86) saturate(.45);
  color-scheme: dark;
}
/* No-JS fallback: follow the system when the head script did not set data-theme. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --paper: #05070d; --sheet: #0c111c; --sheet-2: #121a29; --glass: rgba(13, 19, 32, .68); --field: #080c15;
    --ink: #edf2fb; --ink-2: #b4bed0; --ink-3: #8691a7; --rule: rgba(150, 178, 230, .13); --rule-strong: rgba(150, 178, 230, .27);
    --grid: rgba(140, 175, 235, .05); --tick: #a8e6ff;
    --accent: #7fd8ff; --accent-ink: #a6e5ff; --accent-wash: rgba(127, 216, 255, .1); --on-accent: #03111c; --glow: rgba(127, 216, 255, .28); --signal: #ffb65c;
    --ok: #5ee0a6; --ok-wash: rgba(94, 224, 166, .11); --warn: #f3c46a; --warn-wash: rgba(243, 196, 106, .11); --burn: #ff8474; --burn-wash: rgba(255, 132, 116, .11);
    --shadow: 0 0 0 1px rgba(0, 0, 0, .2), 0 24px 60px -30px rgba(0, 0, 0, .9);
    --page-glow: radial-gradient(1100px 560px at 78% -12%, rgba(70, 140, 255, .15), transparent 62%);
    --map-bg: #313d45; --tile-filter: invert(1) hue-rotate(195deg) brightness(.92) contrast(.86) saturate(.45);
    color-scheme: dark;
  }
}

@media (prefers-reduced-motion: reduce) {
  :root { --dur: 0ms; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

/* ------------------------------------------------------------------ base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; background: var(--paper); }
body {
  margin: 0;
  background-color: var(--paper);
  background-image: var(--page-glow);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--ink-2);
  font: 400 var(--fs-base)/var(--lh-body) var(--font-ui);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
/* fine graticule over the page, fading out away from the top */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 64px 64px; background-position: center -1px;
  -webkit-mask-image: radial-gradient(ellipse 90% 75% at 60% 0%, #000 25%, transparent 85%);
          mask-image: radial-gradient(ellipse 90% 75% at 60% 0%, #000 25%, transparent 85%);
}
::selection { background: var(--accent); color: var(--on-accent); }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-1); }
a { color: var(--accent-ink); text-underline-offset: 3px; text-decoration-thickness: 1px; }
.mono, code, kbd, samp { font-family: var(--font-mono); font-feature-settings: "zero" 1; }
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums slashed-zero; }
.label {
  font: 500 11px/1.2 var(--font-mono);
  text-transform: uppercase; letter-spacing: var(--tracking-label); color: var(--ink-3);
}
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
img { max-width: 100%; }

/* HUD corner ticks: add .hud to any panel */
.hud { position: relative; }
.hud::after {
  content: ""; position: absolute; inset: -1px; pointer-events: none; z-index: 3; border-radius: inherit;
  --t: var(--tick); --l: 10px;
  background:
    linear-gradient(var(--t), var(--t)) left top / var(--l) 1px no-repeat,
    linear-gradient(var(--t), var(--t)) left top / 1px var(--l) no-repeat,
    linear-gradient(var(--t), var(--t)) right top / var(--l) 1px no-repeat,
    linear-gradient(var(--t), var(--t)) right top / 1px var(--l) no-repeat,
    linear-gradient(var(--t), var(--t)) left bottom / var(--l) 1px no-repeat,
    linear-gradient(var(--t), var(--t)) left bottom / 1px var(--l) no-repeat,
    linear-gradient(var(--t), var(--t)) right bottom / var(--l) 1px no-repeat,
    linear-gradient(var(--t), var(--t)) right bottom / 1px var(--l) no-repeat;
  opacity: .5;
}

/* ------------------------------------------------------------------ buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: var(--s-2);
  min-height: 40px; padding: 0 var(--s-4);
  font: 500 var(--fs-sm)/1 var(--font-ui); letter-spacing: .005em;
  color: var(--ink); background: var(--glass); border: var(--border-strong); border-radius: var(--r-1);
  text-decoration: none; cursor: pointer;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.btn:hover { border-color: var(--accent); color: var(--ink); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); font-weight: 600; }
.btn--primary:hover { background: var(--accent); color: var(--on-accent); box-shadow: 0 0 0 4px var(--glow), 0 8px 28px -10px var(--glow); }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .45; cursor: not-allowed; box-shadow: none; }

/* ------------------------------------------------------------------ badges */
.badge {
  display: inline-flex; align-items: center; gap: 6px; padding: 3px 8px;
  font: 500 11px/1.4 var(--font-mono); letter-spacing: .04em;
  border: var(--border); border-radius: var(--r-1); background: transparent; color: var(--ink-3);
}
.badge--ok { color: var(--ok); background: var(--ok-wash); border-color: color-mix(in srgb, var(--ok) 30%, transparent); }
.badge--warn { color: var(--warn); background: var(--warn-wash); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.badge--burn { color: var(--burn); background: var(--burn-wash); border-color: color-mix(in srgb, var(--burn) 30%, transparent); }
.badge--accent { color: var(--accent-ink); background: var(--accent-wash); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }

/* ------------------------------------------------------------------ skip link + toast */
.skip { position: absolute; left: -999px; top: 8px; z-index: 2000; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: var(--r-1); }
.skip:focus { left: 8px; }
.toast { position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); z-index: var(--z-toast); background: var(--ink); color: var(--paper); font: 500 var(--fs-sm)/1.3 var(--font-mono); padding: 12px 16px; border-radius: var(--r-1); box-shadow: var(--shadow); max-width: calc(100vw - 32px); }

/* ------------------------------------------------------------------ nav (landing markup + layout.js) */
.nav {
  position: sticky; top: 0; z-index: var(--z-nav);
  background: color-mix(in srgb, var(--paper) 76%, transparent);
  -webkit-backdrop-filter: blur(14px) saturate(1.2); backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: var(--border);
}
.nav__in { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); height: 60px; display: flex; align-items: center; gap: var(--s-4); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink) !important; flex: none; }
.brand__mark { width: 26px; height: 26px; color: var(--ink); flex: none; display: block; }
.brand__mark .eye { fill: var(--accent); }
.brand__mark .pupil { fill: var(--paper); }
.brand__name { font: 400 1.6rem/1 var(--font-display); letter-spacing: -.005em; }
.brand__tick { font: 500 11px/1 var(--font-mono); color: var(--accent-ink); border: var(--bw) solid color-mix(in srgb, var(--accent) 45%, transparent); background: var(--accent-wash); padding: 4px 6px; border-radius: var(--r-1); letter-spacing: .04em; }
.nav__links { margin-left: auto; display: flex; align-items: center; gap: 2px; }
.nav__links a, .nav__sheet a {
  position: relative; font: 500 var(--fs-sm)/1 var(--font-ui); color: var(--ink-2); text-decoration: none;
  padding: 10px 12px; border-radius: var(--r-1); transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.nav__links a:hover, .nav__sheet a:hover { color: var(--ink); background: var(--accent-wash); }
.nav__links a[aria-current="page"], .nav__sheet a[aria-current="page"] { color: var(--ink); }
.nav__links a[aria-current="page"]::after { content: ""; position: absolute; left: 12px; right: 12px; bottom: -10px; height: 2px; background: var(--accent); box-shadow: 0 0 12px var(--glow); }
.nav__sheet a[aria-current="page"] { background: var(--accent-wash); }
.nav__links a[data-link] { font-family: var(--font-mono); font-size: 12px; color: var(--ink-3); }
.nav__links a[data-link]:hover { color: var(--ink); }
.nav__links a[data-link="x"] { margin-left: 8px; }
.nav__menu { display: none; position: relative; }
.nav__menu summary { list-style: none; cursor: pointer; width: 40px; height: 40px; display: grid; place-content: center; gap: 5px; border: var(--border-strong); border-radius: var(--r-1); background: var(--glass); }
.nav__menu summary::-webkit-details-marker { display: none; }
.nav__menu summary span { display: block; width: 16px; height: 1.5px; background: var(--ink); transition: transform var(--dur) var(--ease); }
.nav__menu[open] summary span:first-child { transform: translateY(3.25px) rotate(45deg); }
.nav__menu[open] summary span:last-child { transform: translateY(-3.25px) rotate(-45deg); }
.nav__sheet { position: absolute; right: 0; top: 50px; min-width: 200px; background: var(--sheet); border: var(--border-strong); border-radius: var(--r-2); box-shadow: var(--shadow); padding: 6px; display: grid; }

/* theme toggle */
.theme-toggle {
  flex: none; width: 40px; height: 40px; display: grid; place-items: center; padding: 0; cursor: pointer;
  color: var(--ink); background: var(--glass); border: var(--border-strong); border-radius: var(--r-1);
  transition: border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.theme-toggle:hover { border-color: var(--accent); box-shadow: 0 0 0 3px var(--glow); }
.theme-toggle svg { width: 18px; height: 18px; grid-area: 1 / 1; transition: opacity var(--dur) var(--ease), transform 420ms var(--ease); }
.theme-toggle .i-sun { opacity: 0; transform: rotate(-60deg) scale(.6); }
:root[data-theme="dark"] .theme-toggle .i-sun { opacity: 1; transform: none; }
:root[data-theme="dark"] .theme-toggle .i-moon { opacity: 0; transform: rotate(60deg) scale(.6); }
.nav__links + .theme-toggle { margin-left: 6px; }

@media (max-width: 900px) {
  .nav__links { display: none; }
  .nav__menu { display: block; }
  .theme-toggle { margin-left: auto; }
  .nav__in { height: 56px; gap: 10px; }
}
@media (max-width: 360px) { .brand__tick { display: none; } }

/* ------------------------------------------------------------------ footer */
.foot { margin-top: var(--s-9); border-top: var(--border); background: color-mix(in srgb, var(--sheet) 55%, transparent); position: relative; }
.foot::before { content: ""; position: absolute; left: 0; right: 0; top: -1px; height: 1px; background: linear-gradient(90deg, transparent, var(--accent) 50%, transparent); opacity: .5; }
.foot__in { max-width: var(--maxw); margin: 0 auto; padding: var(--s-7) var(--gutter); display: grid; gap: var(--s-5); }
.foot__brand { display: flex; align-items: center; gap: 10px; font: 400 1.6rem/1 var(--font-display); color: var(--ink); }
.foot__brand .brand__mark { width: 22px; height: 22px; }
.foot__cols { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: var(--s-6); }
.foot__cols > div { display: grid; gap: 10px; align-content: start; min-width: 0; }
.foot__list { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: var(--fs-sm); }
.foot__list a { color: var(--ink-2); text-decoration: none; }
.foot__list a:hover { color: var(--accent-ink); text-decoration: underline; }
.foot__list a.mono { font-size: var(--fs-xs); overflow-wrap: anywhere; }
.foot__list--inline { display: flex; flex-wrap: wrap; gap: 6px 16px; }
.foot__small { font-size: var(--fs-xs); color: var(--ink-3); line-height: 1.7; margin: 0; }
.foot__disc { font-size: var(--fs-xs); color: var(--ink-3); border-top: var(--border); padding-top: var(--s-4); max-width: 92ch; margin: 0; line-height: 1.7; }
@media (max-width: 640px) { .foot__cols { grid-template-columns: 1fr; } }

/* ------------------------------------------------------------------ Leaflet in both themes */
html .leaflet-container { background: var(--map-bg); font-family: var(--font-ui); }
.leaflet-tile-pane { filter: var(--tile-filter); }
html .leaflet-container a { color: var(--accent-ink); }
html .leaflet-bar { border: var(--border-strong); border-radius: var(--r-1); box-shadow: none; overflow: hidden; }
html .leaflet-bar a, html .leaflet-bar a:hover { background: var(--sheet); color: var(--ink); border-bottom: var(--border); }
html .leaflet-bar a:hover { background: var(--sheet-2); }
html .leaflet-bar a:last-child { border-bottom: 0; }
html .leaflet-container .leaflet-control-attribution { background: color-mix(in srgb, var(--sheet) 86%, transparent); color: var(--ink-2); font: 10.5px/1.5 var(--font-ui); padding: 1px 6px; }
html .leaflet-container .leaflet-control-attribution a { color: var(--accent-ink); }
html .leaflet-tooltip { background: var(--sheet); color: var(--ink); border: var(--border-strong); border-radius: var(--r-1); box-shadow: var(--shadow); font: 500 11px/1.4 var(--font-mono); }
html .leaflet-tooltip-top::before { border-top-color: var(--rule-strong); }
html .leaflet-tooltip-bottom::before { border-bottom-color: var(--rule-strong); }
html .leaflet-tooltip-left::before { border-left-color: var(--rule-strong); }
html .leaflet-tooltip-right::before { border-right-color: var(--rule-strong); }