/* Fonts: self-hosted latin subsets (Inter is variable, Saira Condensed is static) */
@font-face {
  font-family: 'Inter';
  font-style: normal;
  font-weight: 400 600;
  font-display: swap;
  src: url('../fonts/inter-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Saira Condensed';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url('../fonts/saira-condensed-600-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}
@font-face {
  font-family: 'Saira Condensed';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/saira-condensed-700-latin.woff2') format('woff2');
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

/* Background: picked per load by the script in <head>; --bg-image is the no-JS
   fallback. Paths resolve against css/, hence the ../ */
:root {
  --bg-image: url('../images/background1-blur.webp');
  --bg-overlay-top: 38.5%;     /* dark overlay strength, top of screen */
  --bg-overlay-bottom: 57.4%;  /* dark overlay strength, bottom of screen */
  --bg-fade: 2s;               /* how long the backdrop takes to fade in */
  --bg-swap: 1.1s;             /* cross-fade when the footer cycles the backdrop */
  /* The images ship pre-blurred and pre-graded (saturate 0.7, brightness 0.65) so
     no filter runs at draw time. Colours drawn with them carry the same grade;
     re-derive these if the palette tokens they come from change. */
  --bg-base:      #090908;     /* --brown-950, graded */
  --bg-glow:      #958031;     /* --yellow, graded */
  --bg-glow-dim:  #493f1b;     /* --yellow-dim 85% toward black, graded */
  --bg-glow-line: #262621;     /* --line, graded */
  --bg-gradients:
    radial-gradient(closest-side at 22% 18%, color-mix(in srgb, var(--bg-glow) 22%, transparent), transparent 70%),
    radial-gradient(closest-side at 82% 72%, color-mix(in srgb, var(--bg-glow-dim) 30%, transparent), transparent 72%),
    radial-gradient(closest-side at 55% 105%, color-mix(in srgb, var(--bg-glow-line) 55%, transparent), transparent 70%);
}

/* Theme: tweak the base colours; tints, borders, the dial and icons are mixed from them. */
:root {
  /* browns, darkest to lightest */
  --brown-900: #121210;   /* page background */
  --brown-800: #1e1e19;   /* panels, active rows */
  --brown-700: #2e2e26;   /* lightest tint, hovers */
  --line:      #3a3a30;   /* borders */

  /* text */
  --white:  #ffffff;      /* strong text and key notes */
  --text:   #e9e6dc;      /* off-white body text and headings */
  --text-2: #b4b0a3;      /* secondary text */
  --muted:  #86837a;      /* hints */
  --faint:  #6b6860;      /* placeholders, scale labels */

  /* accents */
  --yellow:   #f5c518;
  --red:      #e5533c;    /* out of range, errors */
  --red-soft: #ff7a63;    /* red text on dark backgrounds */
  --shadow:   #000000;

  /* icons: base strokes and the highlighted part */
  --icon-color:  var(--white);
  --icon-accent: var(--yellow);

  /* derived: mixed from the base colours above */
  --brown-950:  color-mix(in srgb, var(--brown-900) 78%, black);
  --brown-850:  color-mix(in srgb, var(--brown-900), var(--brown-800));
  --brown-750:  color-mix(in srgb, var(--brown-800), var(--brown-700));
  --popover-bg: color-mix(in srgb, var(--brown-800) 62%, var(--brown-700));
  --line-hi:    color-mix(in srgb, var(--line) 91%, var(--text));
  --line-soft:  color-mix(in srgb, var(--text) 8%, transparent);

  --yellow-hi:   color-mix(in srgb, var(--yellow) 88%, var(--white));
  --yellow-soft: color-mix(in srgb, var(--yellow) 88%, var(--brown-900));
  --yellow-dim:  color-mix(in srgb, var(--yellow) 54%, var(--brown-900));
  --yellow-wash: color-mix(in srgb, var(--yellow) 10%, transparent);
  --yellow-edge: color-mix(in srgb, var(--yellow) 35%, transparent);
  --on-yellow:   color-mix(in srgb, var(--yellow) 10%, black);

  --red-wash: color-mix(in srgb, var(--red) 12%, transparent);
  --red-edge: color-mix(in srgb, var(--red) 42%, transparent);

  --r-xl: 18px;
  --r-lg: 14px;
  --r-md: 10px;

  --shell: 680px;
  --shell-wide: 1160px;

  --font-sans: 'Inter', 'Segoe UI', Roboto, system-ui, sans-serif;
  --font-condensed: 'Saira Condensed', 'Bahnschrift', 'Arial Narrow', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
[hidden] { display: none !important; }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;   /* ignores mobile browser toolbars so centring is true */
  padding: 40px 20px;
  background: var(--brown-900);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  display: flex;
  justify-content: center;
  align-items: center;  /* centres vertically; taller pages just scroll from the top */
}

/* Backdrop: a stack of image layers under a static glow. A swap fades a new layer
   in on top, then drops the layers it has covered (see advanceBackdrop). Only
   opacity animates, so the compositor blends it without repainting. */
.backdrop {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-color: var(--bg-base);
  animation: bg-fade-in var(--bg-fade) ease-in-out;
}
.backdrop-img,
.backdrop::after {
  position: absolute;
  inset: 0;
}
.backdrop-img {
  background: var(--bg-image, none) center / cover no-repeat;
  will-change: opacity;
}
/* after the image layers in tree order, so it always sits on top of them */
.backdrop::after {
  content: "";
  background-image: var(--bg-gradients);
}
@keyframes bg-fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@media (prefers-reduced-motion: reduce) {
  .backdrop { animation-duration: 0s; }
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--brown-950) var(--bg-overlay-top), transparent) 0%,
    color-mix(in srgb, var(--brown-950) var(--bg-overlay-bottom), transparent) 100%);
}

.shell {
  width: 100%;
  max-width: var(--shell-wide);
  container: shell / inline-size;
}
/* stacked layout keeps the narrow reading width until two panels fit side by side */
.shell > * { max-width: var(--shell); margin-inline: auto; }

h1, h2 {
  font-family: var(--font-condensed);
  letter-spacing: 0.045em;
  text-transform: uppercase;
  margin: 0;
}
h1 { font-size: 30px; font-weight: 700; line-height: 1.1; white-space: nowrap; }
h1 .slashes { color: var(--yellow); margin-right: 0.27em; }
h2 { font-size: 15px; font-weight: 600; color: var(--text-2); }
strong { color: var(--white); font-weight: 600; }

.strapline { color: var(--text-2); font-size: 13.5px; margin: 4px 0 22px; white-space: nowrap; }
.strapline code { color: var(--yellow-soft); }

/* dark halo keeps the title readable over the background */
header {
  text-shadow:
    0 0 6px color-mix(in srgb, var(--brown-900) 85%, transparent),
    0 0 18px color-mix(in srgb, var(--brown-900) 65%, transparent);
}

/* panels */
.panel {
  position: relative;
  container: panel / inline-size;
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--brown-800) 92%, transparent),
    color-mix(in srgb, var(--brown-850) 94%, transparent));
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  /* no backdrop-filter: the background is already blurred */
  box-shadow: 0 18px 44px color-mix(in srgb, var(--shadow) 45%, transparent);
}
.panel + .panel,
.duo + .panel { margin-top: 16px; }
/* lift a panel above its siblings while one of its popovers is open */
.panel:has(.popover[data-open="true"]) { z-index: 50; }

/* two-up layout */
@container shell (min-width: 1040px) {
  .shell > * { max-width: none; }
  .duo {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .duo > .panel + .panel { margin-top: 0; }
  .duo > .panel { display: flex; flex-direction: column; }
  .duo .panel-body { flex: 1; display: flex; flex-direction: column; }
  .duo .empty { flex: 1; display: flex; flex-direction: column; justify-content: center; }
}

.panel-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line-soft);
}
.panel-body { padding: 18px; }

/* how to use */
.howto { counter-reset: step; margin: 0; padding: 0; list-style: none; }
.howto li {
  counter-increment: step;
  position: relative;
  padding-left: 30px;
  margin-bottom: 7px;
  font-size: 13.5px;
  color: var(--text-2);
}
.howto li:last-child { margin-bottom: 0; }
.howto li::before {
  content: counter(step);
  position: absolute;
  left: 0; top: 1px;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--yellow-wash);
  border: 1px solid var(--yellow-edge);
  color: var(--yellow);
  font-family: var(--font-condensed);
  font-size: 12px;
  font-weight: 700;
  display: grid;
  place-items: center;
}
.howto code { color: var(--yellow-soft); background: var(--brown-750); padding: 1px 5px; border-radius: 4px; font-size: 12.5px; }

.howto-head {
  font-family: var(--font-condensed);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 9px;
}
.howto-mode { color: var(--yellow-soft); }
/* opt out of the 62ch measure from .details-body p */
.details-body .howto-sub { margin: -6px 0 7px; color: var(--muted); font-size: 12.5px; max-width: none; }
.howto-group + .howto-group {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

/* steps take three quarters, the diagram the last; stacked when narrow */
@container panel (min-width: 520px) {
  .howto-group {
    display: grid;
    grid-template-columns: minmax(0, 3fr) minmax(0, 1fr);
    /* diagram spans the first three rows; the 1fr row absorbs extra height */
    grid-template-rows: auto auto 1fr auto;
    column-gap: 22px;
    align-items: start;
  }
  .howto-group > * { grid-column: 1; }
  .howto-group > .howto-diagram { grid-column: 2; grid-row: 1 / span 3; align-self: start; }
  .howto-group > .shots { grid-column: 1 / -1; }
}
.howto-diagram {
  position: relative;
  margin: 14px 0 0;
  max-width: 300px;
  aspect-ratio: 3 / 2;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--brown-850);
}
/* icons come from icons/ via <use>; arrows use --muted */
/* hit areas use the drawing's 300 x 200 units (40 units = 13.33% x 20%) */
.diagram-pin {
  position: absolute;
  width: 13.3333%;
  height: 20%;
}
.diagram-hit {
  position: absolute;
  inset: -4px;
  padding: 0;
  border-radius: 50%;
  transition: background-color 130ms ease;
}
.diagram-hit:hover { background: var(--yellow-wash); }
.diagram-hit:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--yellow-wash); }
/* size to the text; arrow sits over the icon centre */
.diagram-pin .popover {
  width: max-content;
  max-width: min(240px, calc(100vw - 56px));
  left: calc(50% - 17px);
}
.diagram-pin .popover.align-right { left: auto; right: calc(50% - 17px); }
.howto-diagram svg { display: block; width: 100%; height: 100%; color: var(--icon-color); }
/* decorative grid, faint so the arrows lead */
.diagram-grid {
  fill: none;
  stroke: color-mix(in srgb, var(--muted) 25%, var(--brown-850));
  stroke-width: 1;
  vector-effect: non-scaling-stroke;   /* stays 1px when scaled */
}
.diagram-line {
  fill: none;
  stroke: var(--muted);
  stroke-width: 2.92;
  stroke-linecap: square;
  stroke-linejoin: round;
}
/* icon not used in this drill */
.howto-diagram .diagram-icon-dim { color: var(--text-2); }
.diagram-head { fill: var(--muted); }
@container panel (min-width: 520px) { .howto-diagram { margin: 0; max-width: none; } }
.details-body .howto-note {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  color: var(--muted);
  max-width: none;
}

.howto-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 0 1px;
  font-size: inherit;
  font-weight: 600;
  line-height: inherit;
  color: var(--yellow);
  border-bottom: 1px dashed var(--yellow-edge);
  transition: color 130ms ease, border-color 130ms ease;
}
.howto-link:hover { color: var(--yellow-hi); border-bottom-color: var(--yellow); }
.howto-link:focus-visible { outline: none; border-radius: 3px; box-shadow: 0 0 0 3px var(--yellow-wash); }
.howto-link .chev-sm {
  width: 6px; height: 6px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
  transition: transform 160ms ease;
}
.howto-link[aria-expanded="true"] .chev-sm { transform: translateY(1px) rotate(-135deg); }

.shots {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 12px 0 6px;
  animation: reveal 170ms ease-out;
}
.shot { margin: 0; }
.shot-frame {
  position: relative;
  aspect-ratio: 3 / 2;
  display: grid;
  place-items: center;
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px dashed var(--line);
  background: var(--brown-850);
}
.shot-frame:has(img:not([hidden])) { border-style: solid; }
.shot-frame::before {
  content: attr(data-label);
  font-family: var(--font-condensed);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--faint);
}
.shot-frame img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.shot figcaption { margin-top: 7px; font-size: 12.5px; line-height: 1.45; color: var(--text-2); }
.shot kbd {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 5px;
  border-radius: 4px;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  background: var(--brown-750);
  color: var(--text);
}

/* position rows */
.row {
  display: grid;
  grid-template-columns: 112px 1fr 1fr auto;
  gap: 10px;
  align-items: center;
  padding: 13px 16px;
  border-radius: var(--r-lg);
  background: var(--brown-850);
  border: 1px solid transparent;
  border-left: 3px solid var(--line);
  transition: border-color 140ms ease, background 140ms ease;
}
.row + .row { margin-top: 10px; }
.row.is-active { border-left-color: var(--yellow); background: var(--brown-800); }
.row.is-filled { border-left-color: var(--yellow-dim); }
.row.is-derived { border-left-color: var(--yellow-soft); background: color-mix(in srgb, var(--yellow) 4.5%, transparent); }
/* spotter on: mute the target title so the two inputs read as either/or */
.row.is-derived .row-label { color: var(--muted); --icon-color: var(--muted); --icon-accent: var(--muted); }
.row.is-off { opacity: 0.42; }
/* trailing auto column for the paste button, as in .row */
.row.spotter-detail { grid-template-columns: 112px repeat(4, 1fr) auto; }

.row-label {
  font-family: var(--font-condensed);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* icons */
/* Inline SVGs: strokes use currentColor, .accent uses --icon-accent.
   :where() keeps specificity at zero. */
.icon {
  width: 18px; height: 18px;
  flex: none;
  color: var(--icon-color);
}
:where(.icon .accent[stroke]:not([stroke="none"])) { stroke: var(--icon-accent); }
:where(.icon .accent[fill]:not([fill="none"])) { fill: var(--icon-accent); }

/* inputs */
.field { position: relative; display: flex; align-items: center; }
.field-prefix,
.field-suffix {
  position: absolute;
  left: 12px;
  font-family: var(--font-condensed);
  font-size: 13px;
  font-weight: 600;
  color: var(--yellow-dim);
  pointer-events: none;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
/* the unit trails the value: placeUnit() sets --suffix-x; hidden until then and while empty */
.field-suffix {
  left: var(--suffix-x, 12px);
  right: auto;
  opacity: 0;
  transition: opacity 120ms ease;
}
.field.has-unit .field-suffix { opacity: 1; }

input[type="text"] {
  width: 100%;
  padding: 9px 12px 9px 4ch;
  background: var(--brown-750);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
input[type="text"]::placeholder { color: var(--faint); }
input[type="text"]:hover:not(:disabled):not([readonly]) { border-color: var(--line-hi); }
input[type="text"]:focus {
  outline: none;
  border-color: var(--yellow);
  box-shadow: 0 0 0 3px var(--yellow-wash);
}
input[type="text"]:disabled { cursor: not-allowed; background: var(--brown-800); }
input[type="text"][readonly] {
  background: color-mix(in srgb, var(--yellow) 6%, transparent);
  border-color: var(--yellow-edge);
  color: var(--yellow);
  cursor: default;
}
input.is-bad { border-color: var(--red); }
input.is-bad:focus { box-shadow: 0 0 0 3px var(--red-wash); }

/* checkbox */
.check {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  cursor: pointer;
  user-select: none;
  font-size: 13.5px;
  color: var(--text-2);
}
.check input { position: absolute; opacity: 0; width: 0; height: 0; }
.check .box {
  width: 18px; height: 18px;
  flex: none;
  border: 1.5px solid var(--line);
  border-radius: 5px;
  background: var(--brown-750);
  display: grid;
  place-items: center;
  transition: all 130ms ease;
}
.check .box::after {
  content: "";
  width: 9px; height: 5px;
  border-left: 2px solid var(--brown-900);
  border-bottom: 2px solid var(--brown-900);
  transform: rotate(-45deg) scale(0.4);
  opacity: 0;
  transition: all 130ms ease;
}
.check input:checked + .box { background: var(--yellow); border-color: var(--yellow); }
.check input:checked + .box::after { opacity: 1; transform: rotate(-45deg) scale(1); }
.check input:focus-visible + .box { box-shadow: 0 0 0 3px var(--yellow-wash); }

.spotter-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 16px 0 10px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-soft);
}

/* buttons */
button { font-family: var(--font-sans); cursor: pointer; border: none; background: none; color: inherit; }

.btn {
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13.5px;
  font-weight: 600;
  border: 1px solid var(--line);
  background: var(--brown-750);
  color: var(--text-2);
  transition: all 130ms ease;
}
.btn:hover:not(:disabled) { background: var(--brown-700); color: var(--text); border-color: var(--line-hi); }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--yellow-wash); }
.btn-primary { background: var(--yellow); border-color: var(--yellow); color: var(--on-yellow); }
.btn-primary:hover:not(:disabled) { background: var(--yellow-hi); border-color: var(--yellow-hi); color: var(--on-yellow); }
.btn-sm { padding: 6px 14px; font-size: 12.5px; }
.btn:disabled { cursor: not-allowed; opacity: 0.4; }

.paste-btn {
  padding: 7px 11px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--brown-750);
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  transition: all 130ms ease;
  white-space: nowrap;
}
.paste-btn:hover:not(:disabled) { color: var(--yellow); border-color: var(--yellow-edge); }
.paste-btn:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--yellow-wash); }
.paste-btn:disabled { cursor: not-allowed; opacity: 0.4; }

/* help + popovers */
.help-wrap { position: relative; display: inline-flex; }
.help {
  width: 17px; height: 17px;
  /* zero the default padding so the glyph centres in Chrome */
  padding: 0;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--brown-750);
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  line-height: 1;
  display: grid;
  place-items: center;
  transition: all 130ms ease;
}
.help:hover, .help[aria-expanded="true"] {
  color: var(--yellow);
  border-color: var(--yellow-edge);
  background: var(--yellow-wash);
}
.help:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--yellow-wash); }

.popover {
  position: absolute;
  z-index: 100;
  top: calc(100% + 9px);
  left: -8px;
  width: 272px;
  padding: 13px 15px;
  background: var(--popover-bg);
  border: 1px solid var(--yellow-edge);
  border-radius: var(--r-lg);
  box-shadow: 0 14px 34px color-mix(in srgb, var(--shadow) 60%, transparent);
  /* reset type inherited from where the popover sits, e.g. the uppercase row labels */
  font-family: var(--font-sans);
  font-weight: 400;
  letter-spacing: normal;
  text-transform: none;
  text-align: left;
  font-size: 13px;
  line-height: 1.55;
  color: var(--text-2);
  display: none;
  translate: var(--nudge, 0px) 0;   /* set by script to keep it on screen */
}
.popover p {
    margin-top: 0;
}
.popover[data-open="true"] { display: block; animation: pop 130ms ease-out; }
.popover::before {
  content: "";
  position: absolute;
  top: -6px; left: 12px;
  width: 10px; height: 10px;
  background: var(--popover-bg);
  border-left: 1px solid var(--yellow-edge);
  border-top: 1px solid var(--yellow-edge);
  transform: rotate(45deg);
  translate: calc(var(--nudge, 0px) * -1) 0;   /* arrow stays over its button */
}
.popover.align-right { left: auto; right: -8px; }
.popover.align-right::before { left: auto; right: 12px; }
.popover code {
  background: color-mix(in srgb, var(--yellow) 12%, transparent);
  color: var(--yellow);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 12px;
}
@keyframes pop {
  from { opacity: 0; transform: translateY(-5px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* solution */
.solution { display: grid; grid-template-columns: 232px 1fr; gap: 22px; align-items: center; }
.dial-wrap { display: grid; place-items: center; }

/* compass dial: shapes are drawn by script, colours come from the theme */
#dial              { --hot: var(--yellow); }
#dial.is-out       { --hot: var(--red); }
#dial .face        { fill: color-mix(in srgb, var(--yellow) 3%, transparent); stroke: var(--line); }
#dial .ring        { fill: none; stroke: color-mix(in srgb, var(--text) 7%, transparent); }
#dial .tick        { stroke: var(--line); }
#dial .tick.major  { stroke: color-mix(in srgb, var(--line) 82%, var(--text)); }
#dial .cardinal    { fill: var(--faint); }
#dial .cardinal.north { fill: var(--yellow); }
#dial .cardinal.ordinal { fill: color-mix(in srgb, var(--faint) 72%, transparent); }
#dial .spot-link   { stroke: color-mix(in srgb, var(--text) 22%, transparent); }
#dial .spot-ray    { stroke: color-mix(in srgb, var(--text) 14%, transparent); }
#dial .spot-dot    { fill: var(--brown-800); stroke: var(--muted); }
#dial .spot-label  { fill: var(--text-2); }
#dial .arc         { fill: none; stroke: color-mix(in srgb, var(--hot) 50%, transparent); }
#dial .north-line  { stroke: color-mix(in srgb, var(--yellow) 28%, transparent); }
#dial .heading     { stroke: var(--hot); }
#dial .target-halo { fill: color-mix(in srgb, var(--hot) 17%, transparent); }
#dial .target-dot  { fill: var(--hot); }
#dial .you-dot     { fill: var(--brown-800); stroke: var(--text); }
#dial .you-pip     { fill: var(--text); }
.readouts { display: flex; flex-direction: column; gap: 12px; }

.readout {
  padding: 14px 18px;
  border-radius: var(--r-lg);
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--yellow) 13%, transparent),
    color-mix(in srgb, var(--yellow) 5%, transparent));
  border: 1px solid var(--yellow-edge);
  transition: background 160ms ease, border-color 160ms ease;
}
.readout-label {
  font-family: var(--font-condensed);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--yellow-soft);
  transition: color 160ms ease;
}
.readout-value {
  font-family: var(--font-condensed);
  font-size: 42px;
  font-weight: 700;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  color: var(--yellow);
  margin-top: 2px;
  transition: color 160ms ease;
}
.readout-sub { font-size: 12px; color: var(--muted); margin-top: 3px; font-variant-numeric: tabular-nums; }
.readout-sub > span:first-child::after { content: " · "; }

.readout.is-out {
  background: linear-gradient(180deg,
    color-mix(in srgb, var(--red) 15%, transparent),
    color-mix(in srgb, var(--red) 5%, transparent));
  border-color: var(--red-edge);
}
.readout.is-out .readout-label { color: var(--red-soft); }
.readout.is-out .readout-value { color: var(--red-soft); }

/* weapon envelopes */
.envelopes { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--line-soft); }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--brown-850);
  font-family: var(--font-condensed);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  transition: all 160ms ease;
}
.chip.is-live {
  background: var(--yellow-wash);
  border-color: var(--yellow);
  color: var(--yellow);
}

/* padding-top clears the marker notch, which sits above the track */
.track-wrap { position: relative; padding-top: 12px; }
.track {
  position: relative;
  height: 26px;
  border-radius: 8px;
  background: var(--brown-850);
  border: 1px solid var(--line);
  overflow: hidden;
}
.band {
  position: absolute;
  top: 0; bottom: 0;
  background: color-mix(in srgb, var(--text) 7%, transparent);
  border-left: 1px solid color-mix(in srgb, var(--text) 14%, transparent);
  border-right: 1px solid color-mix(in srgb, var(--text) 14%, transparent);
  transition: background 160ms ease, border-color 160ms ease;
}
.band.is-live {
  background: color-mix(in srgb, var(--yellow) 24%, transparent);
  border-left-color: var(--yellow);
  border-right-color: var(--yellow);
}
.band-tag {
  position: absolute;
  left: 7px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-condensed);
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--muted), var(--faint));
  white-space: nowrap;
  transition: color 160ms ease;
}
.band.is-live .band-tag { color: var(--yellow); }

.marker {
  position: absolute;
  top: 12px;      /* top of the track */
  height: 26px;   /* matches .track, so the line spans the band exactly */
  width: 2px;
  background: var(--yellow);
  box-shadow: 0 0 9px color-mix(in srgb, var(--yellow) 70%, transparent);
  transition: left 220ms cubic-bezier(.2,.8,.3,1), background 160ms ease;
  z-index: 3;
}
/* the notch, pointing down at the exact range within the band */
.marker::after {
  content: "";
  position: absolute;
  top: -8px; left: 50%;
  transform: translateX(-50%);
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 6px solid var(--yellow);
  transition: border-top-color 160ms ease;
}
.marker.is-out { background: var(--red); box-shadow: 0 0 9px color-mix(in srgb, var(--red) 70%, transparent); }
.marker.is-out::after { border-top-color: var(--red); }

.scale {
  position: relative;
  height: 15px;
  margin-top: 5px;
  font-size: 10.5px;
  color: var(--faint);
  font-variant-numeric: tabular-nums;
}
.scale span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.scale span.edge-l { transform: none; left: 0; }
.scale span.edge-r { transform: none; right: 0; }
/* face 685 and 745 outward so they don't collide */
.scale span.pair-l { transform: translateX(calc(-100% - 3px)); }
.scale span.pair-r { transform: translateX(3px); }

.verdict {
  margin-top: 13px;
  padding: 11px 14px;
  border-radius: var(--r-md);
  font-size: 13.5px;
  line-height: 1.5;
  background: var(--yellow-wash);
  border: 1px solid var(--yellow-edge);
  color: var(--yellow-soft);
}
.verdict.is-out {
  background: var(--red-wash);
  border-color: var(--red-edge);
  color: var(--red-soft);
}
/* empty */
.empty { padding: 34px 20px; text-align: center; color: var(--muted); font-size: 14px; }

.actions {
  display: flex;
  gap: 9px;
  flex-wrap: wrap;
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

.status { margin-top: 12px; font-size: 13px; color: var(--yellow-soft); min-height: 19px; }
.status.err { color: var(--red-soft); }

/* collapsibles */
details { border-top: 1px solid var(--line-soft); }
details:first-of-type { border-top: none; }

summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-condensed);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-2);
  transition: color 130ms ease;
}
summary::-webkit-details-marker { display: none; }
summary:hover { color: var(--text); }
summary:focus-visible { outline: none; box-shadow: inset 0 0 0 2px var(--yellow-edge); }
summary .chev {
  width: 9px; height: 9px;
  border-right: 2px solid var(--yellow);
  border-bottom: 2px solid var(--yellow);
  transform: rotate(-45deg);
  transition: transform 160ms ease;
  flex: none;
}
details[open] > summary .chev { transform: rotate(45deg); }
/* keep the focus ring inside the panel's rounded corners */
.panel > details:first-of-type > summary { border-radius: var(--r-xl) var(--r-xl) 0 0; }
.panel > details:last-of-type:not([open]) > summary { border-radius: 0 0 var(--r-xl) var(--r-xl); }

.details-body {
  padding: 0 18px 18px;
  font-size: 13.5px;
  color: var(--text-2);
  line-height: 1.65;
  animation: reveal 170ms ease-out;
}
@keyframes reveal {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}
.details-body p { margin: 0 0 11px; max-width: 62ch; }
.details-body p:last-child { margin-bottom: 0; }
.details-body code {
  background: var(--brown-750);
  color: var(--yellow-soft);
  padding: 2px 6px;
  border-radius: 5px;
  font-size: 12.5px;
}

footer { margin-top: 22px; text-align: center; font-size: 12px; color: color-mix(in srgb, var(--faint) 85%, var(--brown-900)); }
footer:empty { display: none; }   /* no gap under the page until footer text is added */
/* a button while cycling, a link once it settles on ko-fi; both look like plain text */
.footer-msg {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  /* an inline <a> ignores vertical padding, which would shift the footer on the link */
  display: inline-block;
  padding: 2px 7px;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
}
/* the <3 on the ko-fi link; same hot pink as the footer heart on janne.dev/chat-color */
.footer-heart { color: #ff1169; }
/* no hover colour: the pointer cursor already says it is clickable */
.footer-msg:focus-visible { outline: none; box-shadow: 0 0 0 3px var(--yellow-wash); }
/* underline the "Buy me a coffee here." wording on hover, but not the heart */
.coffee-link:hover .coffee-link-text { text-decoration: underline; }

/* responsive */
/* Rows and the solution respond to their panel's width, not the viewport.
   Four fields abreast need ~732px before values clip, so wrap to two-by-two below that. */
@container panel (max-width: 760px) {
  .row.spotter-detail { grid-template-columns: 112px 1fr 1fr auto; }
  .row.spotter-detail .row-label { grid-row: span 2; }
  /* pinned to row 1 so brg and rng wrap underneath x and y */
  .row.spotter-detail .paste-btn { grid-column: 4; grid-row: 1; }
  /* row 2 has no button, so rng widens into the empty cell */
  .row.spotter-detail .field:last-of-type { grid-column: 3 / -1; }
}
@container panel (max-width: 500px) {
  .solution { grid-template-columns: 1fr; gap: 18px; }
  .readout-value { font-size: 36px; }
}
/* One-panel layout (the inverse of the two-up query): the bearing detail sits beside
   the value, wrapping to two lines when short of room, and the range detail is dropped. */
@container shell (width < 1040px) {
  .readout { display: flex; flex-wrap: wrap; align-items: center; column-gap: 14px; }
  .readout-label { flex-basis: 100%; }
  /* basis 0 so the detail only drops below the value when even two lines won't fit;
     overflow:hidden zeroes the automatic minimum, so restore it explicitly */
  .readout-sub {
    flex: 1 1 0;
    min-width: min-content;
    margin-top: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    overflow: hidden;
  }
  .readout-sub > span { white-space: nowrap; }
  /* The separator overhangs the first part's right edge. On one line the second part's
     margin makes room for it; once wrapped it sits past the edge and is clipped. */
  .readout-sub > span:first-child { margin-right: -1.3em; }
  .readout-sub > span:first-child::after { display: inline-block; width: 1.3em; text-align: center; }
  .readout-sub > span + span { margin-left: 1.3em; }
  #outRangeSub { display: none; }
}
@container panel (max-width: 460px) {
  .row { grid-template-columns: 1fr 1fr; gap: 9px; padding: 12px 13px; }
  .row-label { grid-column: 1 / -1; }
  .row .paste-btn { grid-column: 1 / -1; }
  .row.spotter-detail { grid-template-columns: 1fr 1fr; }
  .row.spotter-detail .row-label { grid-row: auto; }
  /* full width, and no longer pinned to row 1 */
  .row.spotter-detail .paste-btn { grid-column: 1 / -1; grid-row: auto; justify-self: stretch; }
  /* reset the 3 / -1 span above: this layout only has two columns */
  .row.spotter-detail .field:last-of-type { grid-column: auto; }
  .shots { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 620px) {
  body { padding: 24px 14px; }
  /* shrink with the shell instead of wrapping: the title runs ~15.1em and the
     strapline ~24em wide, so these cqi values leave a little headroom */
  h1 { font-size: min(25px, 6.2cqi); }
  .strapline { font-size: min(13.5px, 3.9cqi); }
  .popover { width: min(272px, calc(100vw - 56px)); }
  .band-tag { font-size: 9.5px; letter-spacing: 0.06em; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}