:root {
  --ground: #16181c;
  --panel: #23262c;
  --line: #3a3f47;
  --text: #e7e9ec;
  --muted: #a3a9b2;
  --accent: #5bbe6e;
  --error: #ff8a80;
  color-scheme: dark;
}

* { box-sizing: border-box; }

/* Display rules below would otherwise win over the hidden attribute. */
[hidden] { display: none !important; }

html, body { min-height: 100%; }

body {
  margin: 0;
  padding: env(safe-area-inset-top) max(16px, env(safe-area-inset-right)) env(safe-area-inset-bottom) max(16px, env(safe-area-inset-left));
  background: var(--ground);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; padding-block: 12px; }
.study-link { margin-left: auto; text-decoration: none; }
h1 { margin: 0; line-height: 0; }
h1 img { display: block; height: 44px; width: auto; }
h2 { margin-top: 8px; font-size: 20px; }
h3 { margin-bottom: 6px; font-size: 16px; }
small { color: var(--muted); font-weight: normal; }
main { max-width: 1100px; margin-inline: auto; }

nav { display: flex; gap: 4px; }
nav button[aria-selected="true"] { background: var(--accent); border-color: var(--accent); color: #0d1a10; }

button, .button {
  display: inline-block;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  color: var(--text);
  font: inherit;
  cursor: pointer;
}
button:hover, .button:hover { border-color: var(--muted); }
button:focus-visible, .button:focus-within, .drop:focus-within { outline: 2px solid var(--accent); outline-offset: 2px; }

.toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-bottom: 12px; }
#game-title { font-weight: 600; }
#console-status, #converter-status { color: var(--muted); }
.is-error { color: var(--error) !important; }

#stage { display: flex; align-items: stretch; justify-content: center; gap: 12px; }
#screen-area {
  position: relative;
  flex: 0 1 min(100%, 720px);
  aspect-ratio: 3 / 2;
  min-width: 0;
  background: #000;
  border-radius: 6px;
  overflow: hidden;
}
#screen-area.is-dropping { outline: 2px solid var(--accent); }
canvas { display: block; width: 100%; height: 100%; image-rendering: pixelated; }
#drop-hint {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 16px;
  background: var(--panel);
  color: var(--muted);
  text-align: center;
}
#drop-hint strong { color: var(--text); }
#drop-hint p { margin: 4px 0; }

.keys { color: var(--muted); font-size: 13px; text-align: center; }
kbd { padding: 1px 5px; border: 1px solid var(--line); border-radius: 4px; background: var(--panel); font: inherit; font-size: 12px; }

.pad { display: none; flex: 0 0 auto; width: 150px; flex-direction: column; align-items: center; justify-content: space-between; gap: 8px; }
.pad button { touch-action: none; user-select: none; -webkit-user-select: none; padding: 0; background: rgb(255 255 255 / 10%); }
.pad button.is-held { background: rgb(255 255 255 / 40%); }
.pill { width: 100%; height: 40px; border-radius: 20px; }
.dpad { display: grid; grid-template: repeat(3, 44px) / repeat(3, 44px); }
.dpad [data-button="UP"] { grid-area: 1 / 2; }
.dpad [data-button="LEFT"] { grid-area: 2 / 1; }
.dpad [data-button="RIGHT"] { grid-area: 2 / 3; }
.dpad [data-button="DOWN"] { grid-area: 3 / 2; }
.face { position: relative; width: 130px; height: 120px; }
.face button { position: absolute; width: 60px; height: 60px; border-radius: 50%; font-size: 18px; }
.face [data-button="A"] { top: 0; right: 0; }
.face [data-button="B"] { bottom: 0; left: 0; }

body.has-touch .pad { display: flex; }
body.has-touch [data-keyboard-only] { display: none; }

/* While playing on a phone, the game gets all the room the toolbar leaves. */
body.has-touch.is-playing header,
body.has-touch.is-playing footer { display: none; }
body.has-touch.is-playing { padding-block: 8px; }
body.has-touch.is-playing .toolbar { margin-bottom: 8px; }

@media (orientation: landscape) {
  body.has-touch #stage { height: calc(100dvh - 70px); min-height: 220px; }
  body.has-touch #screen-area { flex: 0 1 auto; height: 100%; }
  body.has-touch .pad { width: auto; flex: 1 1 110px; max-width: 170px; }
  body.has-touch .dpad { grid-template: repeat(3, 38px) / repeat(3, 38px); }
  body.has-touch .pill { height: 34px; }
  body.has-touch .face { width: 120px; height: 104px; }
  body.has-touch .face button { width: 52px; height: 52px; }
}

@media (orientation: portrait) {
  body.has-touch #stage { flex-wrap: wrap; }
  body.has-touch #screen-area { flex: 1 1 100%; order: -1; }
  body.has-touch .pad { width: calc(50% - 6px); }
}

.drop {
  display: block;
  padding: 40px 16px;
  border: 2px dashed var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--muted);
  text-align: center;
  cursor: pointer;
}
.drop strong { color: var(--text); }
.drop.is-dropping { border-color: var(--accent); }

table { border-collapse: collapse; }
td { padding: 3px 16px 3px 0; overflow-wrap: anywhere; }
td:first-child { color: var(--muted); }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

footer { max-width: 1100px; margin: 32px auto 0; padding-block: 12px; border-top: 1px solid var(--line); color: var(--muted); font-size: 13px; }
footer p { margin: 4px 0; }
a { color: var(--accent); }

.study p { max-width: 75ch; }
.study figure { margin: 28px 0; }
.study figure img { display: block; width: 100%; height: auto; border-radius: 8px; }
.study figcaption { max-width: 75ch; margin-top: 8px; color: var(--muted); }
.study figcaption strong { color: var(--text); }
.table-scroll { overflow-x: auto; }
.data caption { margin-bottom: 6px; color: var(--muted); text-align: left; }
.data th, .data td { padding: 4px 20px 4px 0; border-bottom: 1px solid var(--line); text-align: right; font-variant-numeric: tabular-nums; }
.data td:first-child { color: inherit; }
.data th:first-child { font-weight: normal; text-align: left; }
.twin { margin-top: 28px; }
.twin .data em { font-weight: inherit; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 720px; margin-block: 12px 20px; }
.study .pair figure { margin: 0; min-width: 0; }
.study .pair img { aspect-ratio: 1; object-fit: contain; background: var(--panel); }
.study .pair figcaption { font-size: 13px; overflow-wrap: anywhere; }