/* An Amiga tracker look, after ProTracker 3: grey bevelled panels, a black "pattern"
   display with cyan text, a blue cursor bar and a red cursor box. Colours and fonts
   only. The light theme (the default) is ProTracker's grey control panel; the dark
   theme its pattern editor. */

:root {
  /* ProTracker's own palette */
  --pt-grey: #aaaaaa;
  --pt-white: #ffffff;
  --pt-shade: #330000;
  --pt-black: #000000;
  --pt-cyan: #33ddff;
  --pt-blue: #0000bb;
  --pt-yellow: #ffdd00;
  --pt-red: #dd0044;
  --pt-pink: #ff5599;

  /* light: the control panel */
  --page: var(--pt-black);
  --panel: var(--pt-grey);
  --text: var(--pt-shade);
  --muted: #552222;
  --value: var(--pt-blue);
  --link: var(--pt-blue);
  --step-hi: var(--pt-white);
  --step-lo: var(--pt-shade);
  color-scheme: light;
}

/* The dark theme only when chosen with the toggle; light is the default. */
:root[data-theme="dark"] {
  --panel: var(--pt-black);
  --text: var(--pt-cyan);
  --muted: var(--pt-grey);
  --value: var(--pt-yellow);
  --link: var(--pt-yellow);
  --step-hi: var(--pt-shade);
  --step-lo: var(--pt-white);
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 15px/1.6 "Topaz", "Topaz a1200", "Lucida Console", Consolas, "DejaVu Sans Mono", ui-monospace, "Courier New", monospace;
}

a { color: var(--link); font-weight: 700; }
strong { color: var(--value); }
code { font: inherit; color: var(--value); overflow-wrap: anywhere; }

/* Focus: ProTracker's red cursor box. */
:focus-visible { outline: 2px solid var(--pt-red); outline-offset: 2px; }

.wrap { max-width: 940px; margin: 0 auto; padding: 0 16px; }

/* Bevels: light from the top left, as on the Amiga. */
.raised { box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade); }

/* ---- title bar ---------------------------------------------------------------- */

.top { padding-top: 16px; }
.top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--pt-grey);
  color: var(--pt-shade);
  padding: 10px 12px;
  box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}
.top-row > div { flex: 1; min-width: 0; }
h1 {
  display: inline-block;
  margin: 0;
  padding: 4px 12px;
  font-size: 1.25rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pt-shade);
  box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}
.sub {
  margin: 8px 0 0;
  padding: 3px 10px;
  background: var(--pt-black);
  color: var(--pt-cyan);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}

/* ---- the page body: one grey frame, like the tracker's window ------------------ */

main.wrap {
  background: var(--pt-grey);
  padding-top: 12px;
  padding-bottom: 12px;
  box-shadow: inset 2px 0 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}

.lead {
  margin: 0 0 12px;
  padding: 10px 14px;
  background: var(--panel);
  color: var(--text);
  box-shadow: inset 2px 2px 0 var(--step-hi), inset -2px -2px 0 var(--step-lo);
}

/* Status lines: a sunken black display, like ProTracker's STATUS field. */
.warn, .msg {
  background: var(--pt-black);
  padding: 10px 14px;
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
  overflow-wrap: anywhere;
}
.warn { color: var(--pt-yellow); margin: 0 0 4px; }
.warn strong { color: var(--pt-yellow); text-transform: uppercase; }
.warn a { color: var(--pt-cyan); }
.msg { margin: 12px 0 0; color: var(--pt-cyan); }
.msg.ok { color: var(--pt-cyan); }
.msg.bad { color: var(--pt-pink); }
.msg.info { color: var(--pt-yellow); }

/* ---- steps --------------------------------------------------------------------- */

.step {
  background: var(--panel);
  color: var(--text);
  padding: 16px 18px 18px;
  margin: 12px 0;
  box-shadow: inset 2px 2px 0 var(--step-hi), inset -2px -2px 0 var(--step-lo);
}
.step h2 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 10px;
  font-size: 1.05rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.step h3 { font-size: 0.95rem; margin: 18px 0 6px; text-transform: uppercase; letter-spacing: 0.05em; }
.num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 34px;
  height: 26px;
  padding: 0 6px;
  background: var(--pt-black);
  color: var(--pt-yellow);
  font-size: 0.9rem;
  flex: none;
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
.num::before { content: "0"; }

/* The file drop: a sunken pattern display. */
.drop {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
  padding: 24px 16px;
  cursor: pointer;
  background: var(--pt-black);
  color: var(--pt-cyan);
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
.drop code { color: var(--pt-yellow); }
.drop:hover, .drop.over { outline: 2px solid var(--pt-yellow); outline-offset: -6px; }
.drop:focus-within { outline: 2px solid var(--pt-red); outline-offset: -6px; }
.drop input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-main { font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
.drop-sub { color: var(--pt-grey); font-size: 0.85rem; }

/* ---- mods ---------------------------------------------------------------------- */

.select-all {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
  padding: 6px 12px 6px 10px;
  cursor: pointer;
  background: var(--pt-grey);
  color: var(--pt-shade);
  font-weight: 700;
  text-transform: uppercase;
  box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 10px; }

/* A mod: a raised grey button; ticked, it becomes ProTracker's blue cursor bar. */
.card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 4px 10px;
  padding: 12px 14px;
  cursor: pointer;
  background: var(--pt-grey);
  color: var(--pt-shade);
  box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}
.card:has(input:checked) {
  background: var(--pt-blue);
  color: var(--pt-white);
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
.card input { margin-top: 3px; }
.card-title { font-weight: 700; text-transform: uppercase; letter-spacing: 0.04em; }
.card-body { grid-column: 2; font-size: 0.88rem; }
.card:has(input:checked) .card-body { color: var(--pt-cyan); }
.card-foot { grid-column: 2; display: flex; flex-wrap: wrap; gap: 6px 12px; align-items: center; font-size: 0.8rem; }
.card a { color: var(--pt-blue); }
.card:has(input:checked) a { color: var(--pt-yellow); }
.badge {
  background: var(--pt-black);
  color: var(--pt-cyan);
  padding: 1px 8px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  box-shadow: inset 1px 1px 0 var(--pt-shade), inset -1px -1px 0 var(--pt-white);
}

/* Checkboxes: a small sunken display that lights up yellow. */
input[type="checkbox"] {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  margin: 0;
  flex: none;
  cursor: pointer;
  background: var(--pt-black);
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
input[type="checkbox"]:checked {
  background: var(--pt-yellow);
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white),
    inset 0 0 0 5px var(--pt-black);
}

.selection { color: var(--muted); margin: 14px 0 0; }
.selection strong { color: var(--value); }

/* ---- buttons -------------------------------------------------------------------- */

button, .button {
  font: inherit;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 9px 18px;
  border: 0;
  border-radius: 0;
  background: var(--pt-grey);
  color: var(--pt-shade);
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  box-shadow: inset 2px 2px 0 var(--pt-white), inset -2px -2px 0 var(--pt-shade);
}
button:active:not(:disabled), .button:active {
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
.primary { color: var(--pt-blue); }
button:disabled { color: #777777; cursor: not-allowed; }
.ghost { padding: 6px 12px; font-size: 0.82rem; }
.hint { color: var(--muted); font-size: 0.88rem; margin: 8px 0 0; }

/* ---- result ---------------------------------------------------------------------- */

.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 2px 14px;
  margin: 14px 0;
  padding: 10px 14px;
  background: var(--pt-black);
  color: var(--pt-cyan);
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}
.facts dt { color: var(--pt-grey); text-transform: uppercase; }
.facts dd { margin: 0; overflow-wrap: anywhere; }
#download { margin: 4px 0 10px; }

details { margin-top: 10px; }
summary { cursor: pointer; color: var(--muted); text-transform: uppercase; font-size: 0.88rem; }
pre {
  background: var(--pt-black);
  color: var(--pt-cyan);
  padding: 10px;
  overflow: auto;
  max-height: 320px;
  font: 0.78rem/1.45 "Lucida Console", Consolas, ui-monospace, monospace;
  box-shadow: inset 2px 2px 0 var(--pt-shade), inset -2px -2px 0 var(--pt-white);
}

ol { padding-left: 1.6em; }
li { margin: 4px 0; }
li::marker { color: var(--value); font-weight: 700; }

.foot {
  color: var(--pt-grey);
  font-size: 0.82rem;
  padding-top: 12px;
  padding-bottom: 28px;
}
.foot a { color: var(--pt-cyan); }

@media (max-width: 560px) {
  body { font-size: 14px; }
  .step { padding: 14px 12px; }
  .facts { grid-template-columns: 1fr; }
  .facts dd { margin-bottom: 6px; }
  h1 { font-size: 1.05rem; padding: 4px 8px; }
}