/* Reef Rescue — styles (dark ocean theme).
   Palette uses the Okabe–Ito colourblind-safe set; every colour cue that
   matters (oxygen, items) is paired with a shape, symbol or text as well. */

:root {
  --bg: #04121f;
  --panel: rgba(4, 20, 34, 0.78);
  --ink: #e8f4fb;
  --muted: #a8cbde;
  --accent: #56b4e9;
  --btn: #0072B2;
  --btn-hover: #0b86cc;
  --focus: #F0E442;
  --ui: 1;                 /* text-size scale, set by body.ui-large / body.ui-xl */
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  background: radial-gradient(1200px 700px at 50% -10%, #0a2c47 0%, var(--bg) 60%);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 16px 12px 8px;
}

body.ui-large { --ui: 1.16; }
body.ui-xl { --ui: 1.34; }

/* reduce-motion: kill any CSS animation/transition as well as the canvas effects */
body.motion-reduced *, body.motion-reduced *::before, body.motion-reduced *::after {
  animation: none !important;
  transition: none !important;
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

#app { width: 100%; display: flex; flex-direction: column; align-items: center; }

#stage {
  position: relative;
  width: min(1100px, 96vw);
  aspect-ratio: 16 / 9;
  border-radius: 14px;
  overflow: hidden;
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(86, 180, 233, 0.25);
  background: #062033;
}

canvas#game { display: block; width: 100%; height: 100%; touch-action: none; }
canvas#game:focus-visible { outline: 3px solid var(--focus); outline-offset: -3px; }

.hidden { display: none !important; }
.muted { color: var(--muted); }

/* ---------- HUD ---------- */
#hud {
  position: absolute; top: 0; left: 0; right: 0;
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 10px 12px;
  z-index: 2;
  pointer-events: none;
  font-size: calc(clamp(12px, 1.4vw, 15px) * var(--ui));
}
.hud-box {
  background: var(--panel);
  border: 1px solid rgba(120, 200, 240, 0.32);
  border-radius: 9px;
  padding: calc(4px * var(--ui)) calc(10px * var(--ui));
  white-space: nowrap;
}
.hud-box strong { color: #fff; }
#hud-combo { color: var(--focus); font-weight: 700; }
#oxy-bar {
  display: inline-block; vertical-align: middle;
  width: calc(clamp(70px, 10vw, 130px) * var(--ui));
  height: calc(12px * var(--ui));
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.35);
  border-radius: 6px; overflow: hidden; margin-left: 4px;
}
#oxy-fill { display: block; height: 100%; width: 100%; background: #009E73; border-radius: 6px; }
#oxy-fill.low { background: #E69F00; }
#oxy-fill.crit { background: #D55E00; }
#oxy-num { margin-left: 6px; font-variant-numeric: tabular-nums; color: #fff; }
#oxy-num.low { color: #ffd27a; font-weight: 700; }
#oxy-num.crit { color: #ffb08a; font-weight: 700; }
.hud-spacer { flex: 1; }
.hud-btn {
  pointer-events: auto;
  background: var(--panel);
  color: var(--ink);
  border: 1px solid rgba(120, 200, 240, 0.4);
  border-radius: 9px;
  min-height: calc(34px * var(--ui));
  padding: calc(7px * var(--ui)) calc(14px * var(--ui));
  font-size: inherit;
  font-family: inherit;
  cursor: pointer;
}
.hud-btn:hover { border-color: var(--accent); }

#toast {
  position: absolute; top: 64px; left: 50%; transform: translateX(-50%);
  background: rgba(4, 20, 34, 0.92);
  border: 1px solid rgba(240, 228, 66, 0.55);
  color: #fff;
  padding: 8px 16px; border-radius: 10px;
  font-size: calc(clamp(13px, 1.6vw, 16px) * var(--ui));
  z-index: 4; pointer-events: none;
  max-width: 84%;
  text-align: center;
}

/* ---------- overlays ---------- */
.overlay {
  position: absolute; inset: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 12px;
  padding: 20px 24px;
  text-align: center;
  background: rgba(3, 15, 26, 0.84);
  backdrop-filter: blur(3px);
  z-index: 3;
  overflow-y: auto;
}
/* when the content is taller than the panel, plain "center" clips the top out of
   reach (flexbox overflow); "safe center" falls back to top-aligned instead */
.overlay { justify-content: safe center; }

/* Phones: the stage is a short letterbox strip, so a tall overlay must be
   scrolled inside a small box. Keep the primary buttons reachable while the
   player scrolls it. */
@media (max-width: 640px) {
  .overlay .btn-row {
    position: sticky; bottom: 6px; z-index: 2;
    background: rgba(3, 15, 26, 0.9);
    padding: 8px 12px; border-radius: 14px;
  }
  .overlay .btn-row .btn { box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5); }
  .overlay #btn-options-close { position: sticky; bottom: 6px; z-index: 2; box-shadow: 0 6px 18px rgba(0, 0, 0, 0.5); }
  /* the wrapped HUD takes two rows on a phone; keep the toast clear of the oxygen bar */
  #toast { top: auto; bottom: 26px; }
}
.overlay h1, .overlay h2 { margin: 0; }
.overlay h2 { font-size: calc(clamp(22px, 3.4vw, 34px) * var(--ui)); }

.logo { font-size: calc(clamp(34px, 6vw, 60px) * var(--ui)); letter-spacing: 4px; }
.logo span { color: var(--accent); }
.tagline { margin: 0; font-size: calc(clamp(13px, 1.8vw, 17px) * var(--ui)); color: var(--ink); }
.howto { margin: 0; font-size: calc(clamp(12px, 1.6vw, 15px) * var(--ui)); color: #cfe9f7; }
.hint { margin: 0; color: var(--muted); font-size: calc(clamp(12px, 1.5vw, 15px) * var(--ui)); }
.best { margin: 0; color: var(--focus); font-size: calc(clamp(12px, 1.5vw, 15px) * var(--ui)); }

.controls {
  display: flex; flex-wrap: wrap; gap: 8px 16px; justify-content: center;
  color: var(--muted); font-size: calc(clamp(12px, 1.5vw, 14px) * var(--ui));
}

kbd {
  background: #0e2b42;
  border: 1px solid #3d6f92;
  border-bottom-width: 2px;
  border-radius: 5px;
  padding: 1px 7px;
  font-family: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.92em;
  color: var(--ink);
}

.btn {
  background: var(--btn);
  color: #fff;
  border: 0;
  border-radius: 12px;
  min-height: calc(44px * var(--ui));
  padding: calc(12px * var(--ui)) calc(26px * var(--ui));
  font-size: calc(clamp(15px, 1.8vw, 18px) * var(--ui));
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
}
.btn:hover { background: var(--btn-hover); }
.btn-ghost { background: transparent; border: 2px solid rgba(120, 200, 240, 0.55); color: var(--ink); }
.btn-ghost:hover { background: rgba(86, 180, 233, 0.12); }
.btn-row { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.btn:focus-visible, .hud-btn:focus-visible, a:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

/* ---------- legend (shapes + names, not colour alone) ---------- */
.legend {
  display: flex; flex-wrap: wrap; gap: 6px 14px; justify-content: center;
  font-size: calc(clamp(12px, 1.5vw, 14px) * var(--ui));
  color: var(--muted);
  max-width: 760px;
}
.legend-item { display: inline-flex; align-items: center; gap: 6px; }
.legend-item svg { width: calc(20px * var(--ui)); height: calc(20px * var(--ui)); flex: none; }
.legend-item .pts { color: var(--ink); font-variant-numeric: tabular-nums; }

/* ---------- options panel ---------- */
.options {
  display: grid;
  grid-template-columns: repeat(3, minmax(190px, 1fr));
  gap: 12px;
  width: 100%;
  max-width: 860px;
  text-align: left;
}
@media (max-width: 760px) { .options { grid-template-columns: 1fr; } }

.options fieldset {
  border: 1px solid rgba(120, 200, 240, 0.3);
  border-radius: 10px;
  padding: 8px 12px 10px;
  background: var(--panel);
  margin: 0;
}
.options legend {
  padding: 0 6px;
  color: var(--muted);
  font-size: calc(clamp(12px, 1.4vw, 14px) * var(--ui));
}
.options label {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 7px 2px;
  min-height: calc(40px * var(--ui));
  font-size: calc(clamp(12px, 1.5vw, 14px) * var(--ui));
  cursor: pointer;
}
.options input[type="radio"] {
  width: calc(18px * var(--ui)); height: calc(18px * var(--ui));
  accent-color: var(--accent);
  margin: 2px 0 0;
  flex: none;
  cursor: pointer;
}
.options label:hover span { color: #fff; }

/* ---------- result screen ---------- */
#result-body {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) minmax(250px, 1.2fr);
  gap: 14px;
  width: 100%;
  max-width: 840px;
  text-align: left;
}
@media (max-width: 720px) { #result-body { grid-template-columns: 1fr; } }

#result-stats {
  background: var(--panel);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: calc(clamp(12px, 1.4vw, 14px) * var(--ui));
  align-self: start;
}
.stat-row {
  display: flex; align-items: center; gap: 8px;
  padding: 4px 0;
  border-bottom: 1px dashed rgba(120, 200, 240, 0.2);
}
.stat-row:last-child { border-bottom: 0; }
.stat-row.total { font-weight: 700; }
.chip {
  width: calc(20px * var(--ui)); height: calc(20px * var(--ui));
  display: inline-flex; align-items: center; justify-content: center;
  flex: none;
}
.chip svg { width: 100%; height: 100%; }
.stat-name { flex: 1; }
.stat-val { font-variant-numeric: tabular-nums; }

.facts { display: grid; gap: 10px; align-content: start; }
.fact {
  background: rgba(86, 180, 233, 0.14);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 10px 12px;
  font-size: calc(clamp(12px, 1.4vw, 14px) * var(--ui));
}
.fact p { margin: 0 0 6px; }
.fact-tag { color: #bcd9e9; font-size: 0.85em; }

#result-impact {
  background: rgba(0, 158, 115, 0.16);
  border-radius: 8px;
  padding: 10px 14px;
  max-width: 840px;
  margin: 0;
  font-size: calc(clamp(12px, 1.5vw, 15px) * var(--ui));
}

/* ---------- misc ---------- */
.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;
}

footer {
  margin-top: 10px;
  color: var(--muted);
  font-size: calc(13px * var(--ui));
  text-align: center;
}
footer a { color: var(--accent); }
footer p { margin: 4px 0; }