:root {
  --bg: #07070b;
  --panel: rgba(16, 17, 26, 0.94);
  --line: #2a2d3d;
  --text: #e6e7ef;
  --dim: #8b8fa6;
  --accent: #39c6ff;
  --ok: #3ddc84;
  --bad: #ff5370;
  --warn: #ffcb6b;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }   /* overlays set display: flex */
html, body { margin: 0; height: 100%; background: var(--bg); color: var(--text);
  font: 14px/1.45 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; overflow: hidden;
  -webkit-touch-callout: none; -webkit-user-select: none; user-select: none; }

#stage { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center; }
#game { background: #000; width: min(100vw, calc(100vh * 1136 / 640)); height: auto;
  aspect-ratio: 1136 / 640; touch-action: none; }

.overlay { position: fixed; inset: 0; display: flex; align-items: center; justify-content: center;
  background: rgba(0, 0, 0, 0.72); z-index: 20; }
.card { max-width: 520px; margin: 16px; padding: 24px 28px; background: var(--panel);
  border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5); }
.card h1 { margin: 0 0 4px; font-size: 26px; letter-spacing: 0.5px; }
.card .sub { margin: 0 0 18px; color: var(--dim); }
.card .note { color: var(--dim); font-size: 13px; }
.check { display: flex; gap: 8px; align-items: flex-start; margin: 14px 0 6px; font-size: 13px; color: var(--dim); }
button { font: inherit; color: var(--text); background: #232638; border: 1px solid var(--line);
  border-radius: 8px; padding: 6px 12px; cursor: pointer; }
button:hover { border-color: var(--accent); }
button.primary { background: var(--accent); color: #001018; border: none; font-weight: 700;
  padding: 10px 28px; font-size: 16px; }
.error { color: var(--bad); white-space: pre-wrap; }

#hud { position: fixed; top: 8px; right: 8px; display: flex; gap: 6px; z-index: 15; opacity: 0.85; }
#hud button { padding: 4px 10px; font-size: 12px; background: rgba(20, 22, 34, 0.85); }
body.panel-open #hud { right: calc(min(440px, 92vw) + 8px); }

#panel { position: fixed; top: 0; right: 0; bottom: 0; width: min(440px, 92vw); background: var(--panel);
  border-left: 1px solid var(--line); z-index: 16; display: flex; flex-direction: column;
  user-select: text; -webkit-user-select: text; }
#panel[hidden] { display: none; }
#panel header { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-bottom: 1px solid var(--line); }
#panel header strong { font-size: 15px; }
#panel header #fps { color: var(--dim); font-size: 12px; flex: 1; }
#panel-body { overflow: auto; padding: 4px 12px 40px; }
#panel h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--dim); margin: 16px 0 6px; }
.count { color: var(--warn); font-weight: 400; text-transform: none; letter-spacing: 0; }
#steps { margin: 0; padding-left: 20px; }
#steps li { margin: 2px 0; }
#steps li.done { color: var(--ok); }
#steps li.now { color: var(--accent); }
#steps li.todo { color: var(--dim); }
#steps li.fail { color: var(--bad); }
.chips { display: flex; flex-wrap: wrap; gap: 4px; list-style: none; padding: 0; margin: 0; }
.chips li { font-size: 12px; padding: 2px 8px; border-radius: 10px; border: 1px solid var(--line); }
.chips li.ok { color: var(--ok); border-color: rgba(61, 220, 132, 0.4); }
.chips li.bad { color: var(--bad); border-color: rgba(255, 83, 112, 0.5); }
dl#stats { display: grid; grid-template-columns: auto 1fr; gap: 2px 12px; margin: 0; font-size: 13px; }
dl#stats dt { color: var(--dim); }
dl#stats dd { margin: 0; font-variant-numeric: tabular-nums; }
#errors details { border: 1px solid rgba(255, 83, 112, 0.35); border-radius: 8px; padding: 6px 8px; margin: 4px 0; }
#errors summary { color: var(--bad); cursor: pointer; word-break: break-word; }
#errors pre, #log { font: 11px/1.4 ui-monospace, Consolas, monospace; white-space: pre-wrap; word-break: break-all; margin: 6px 0 0; color: #c8cbe0; }
#log { max-height: 260px; overflow: auto; background: rgba(0, 0, 0, 0.3); padding: 6px; border-radius: 6px; }
ul.plain { list-style: none; padding: 0; margin: 0; font: 11px/1.45 ui-monospace, Consolas, monospace; }
ul.plain li { padding: 1px 0; word-break: break-word; border-bottom: 1px dashed rgba(255, 255, 255, 0.04); }
ul.plain li b { color: var(--warn); font-weight: 400; margin-right: 6px; }
.empty { color: var(--dim); font-size: 12px; }

.card .logo { display: block; width: 72px; height: 72px; border-radius: 16px; margin: 0 0 12px; }

/* shown until the game presents its first frame */
#loading { position: fixed; inset: 0; z-index: 12; display: flex; flex-direction: column; gap: 14px;
  align-items: center; justify-content: center; background: #000; color: var(--dim); font-size: 15px; pointer-events: none; }
#loading img { border-radius: 22px; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: 0.55; transform: scale(0.96); } }

/* options in the progress panel */
#panel label small { color: var(--dim); font-size: 11px; margin-left: 4px; }
#panel label.check { margin: 6px 0; color: var(--text); }
label.range { display: flex; align-items: center; gap: 10px; margin: 8px 0 2px; font-size: 13px; }
label.range input { flex: 1; }
label.range output { min-width: 56px; text-align: right; font-variant-numeric: tabular-nums; color: var(--accent); }
.small-note { font-size: 12px; margin: 4px 0; color: var(--dim); }

/* version label: bottom left, over the game's side bar; never takes a touch */
#version { position: fixed; left: max(8px, env(safe-area-inset-left)); bottom: max(6px, env(safe-area-inset-bottom));
  z-index: 15; pointer-events: none; font-size: 12px; letter-spacing: 0.5px; color: rgba(255, 255, 255, 0.55);
  text-shadow: 0 1px 2px rgba(0, 0, 0, 0.9); }

/* audio sync tester */
.sync-card { text-align: center; min-width: 300px; }
.sync-card .check { justify-content: center; text-align: left; margin: 8px 0 4px; }
#sync-dot { width: 90px; height: 90px; margin: 16px auto; border-radius: 50%; background: #1d2030;
  border: 3px solid var(--line); transition: background 30ms linear, box-shadow 30ms linear; }
#sync-dot.lit { background: var(--accent); box-shadow: 0 0 34px var(--accent); border-color: var(--accent); }
.sync-row { display: flex; gap: 12px; align-items: center; justify-content: center; margin: 6px 0 10px; }
.sync-row output { min-width: 80px; font-size: 20px; font-variant-numeric: tabular-nums; color: var(--accent); }
.sync-row button { padding: 10px 14px; font-size: 15px; }
button.small { padding: 6px 16px; font-size: 14px; }
button.link { background: none; border: none; color: var(--dim); text-decoration: underline; padding: 6px 4px; }
button.icon { width: 30px; height: 26px; padding: 4px; display: inline-flex; align-items: center; justify-content: center; }
button.icon svg { display: block; width: 18px; height: 18px; }

/* phones and tablets: the progress panel and buttons stay out of the game's way */
@media (pointer: coarse) {
  #hud { top: max(6px, env(safe-area-inset-top)); right: max(6px, env(safe-area-inset-right)); opacity: 0.7; }
  /* half the screen: the game stays visible while the sync is adjusted */
  #panel { width: max(300px, 52vw); font-size: 13px; }
  body.panel-open #hud { right: calc(max(300px, 52vw) + 6px); }
}

/* "rotate the device" (as in Tap Sonic's mobile build) */
#rotate {
  display: none; position: fixed; inset: 0; z-index: 100; background: #000; color: #fff;
  flex-direction: column; align-items: center; justify-content: center; gap: 12px; font-size: 18px; text-align: center;
}
#rotate span { font-size: 54px; }
@media (orientation: portrait) and (pointer: coarse) { #rotate { display: flex; } }

/* add-to-home-screen notice */
#install {
  position: fixed; left: 50%; bottom: max(12px, env(safe-area-inset-bottom)); transform: translateX(-50%);
  width: min(560px, calc(100vw - 24px)); z-index: 30; display: flex; gap: 12px; align-items: center; flex-wrap: wrap;
  padding: 12px 14px; background: var(--panel); border: 1px solid var(--line); border-radius: 14px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.55); font-size: 14px;
}
#install img { border-radius: 10px; flex: none; }
#install-text { flex: 1 1 220px; }
#install-text b { color: var(--accent); }
#install .actions { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; margin-left: auto; }

#alert .card { min-width: 280px; text-align: center; }
#alert-buttons { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 14px; }
#spinner { position: fixed; left: 50%; top: 50%; width: 42px; height: 42px; margin: -21px 0 0 -21px;
  border: 4px solid rgba(255, 255, 255, 0.2); border-top-color: #fff; border-radius: 50%;
  animation: spin 0.8s linear infinite; z-index: 14; pointer-events: none; }
@keyframes spin { to { transform: rotate(360deg); } }