:root {
  --bg: #0f1620;
  --panel: #1a2533;
  --panel-light: #233044;
  --accent: #4fd1c5;
  --accent-dark: #2ca39a;
  --text: #eef3f8;
  --text-dim: #9fb0c2;
  --correct: #4ade80;
  --incorrect: #f87171;
  --land: #3a4a5e;
  --land-stroke: #1a2533;
  --ocean: #101820;
  --you: #fb923c;

  --diff-1: #4ade80;
  --diff-2: #facc15;
  --diff-3: #fb923c;
  --diff-4: #f87171;
}

* { box-sizing: border-box; }

html, body {
  margin: 0; padding: 0;
  height: 100%;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
}

#app {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

.screen { display: none; }
.screen.active { display: block; }
.hidden { display: none !important; }

h1 {
  text-align: center;
  font-size: 2.2rem;
  margin-bottom: 4px;
  letter-spacing: 1px;
}

.subtitle {
  text-align: center;
  color: var(--text-dim);
  margin-top: 0;
  margin-bottom: 28px;
}

/* ---- Setup ---- */
.setup-group { margin-bottom: 24px; }

.setup-group h2 {
  font-size: 1.05rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 10px;
  font-weight: 600;
}

.setup-group h2 .hint {
  text-transform: none;
  letter-spacing: normal;
  font-weight: 400;
  font-size: 0.85rem;
  opacity: 0.8;
}

.options-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.option-btn {
  background: var(--panel);
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 14px 16px;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}

.option-btn:hover { background: var(--panel-light); transform: translateY(-1px); }
.option-btn.selected { border-color: var(--accent); background: var(--panel-light); }

#difficulty-options .option-btn[data-difficulty="1"] { border-color: color-mix(in srgb, var(--diff-1) 35%, transparent); }
#difficulty-options .option-btn[data-difficulty="2"] { border-color: color-mix(in srgb, var(--diff-2) 35%, transparent); }
#difficulty-options .option-btn[data-difficulty="3"] { border-color: color-mix(in srgb, var(--diff-3) 35%, transparent); }
#difficulty-options .option-btn[data-difficulty="4"] { border-color: color-mix(in srgb, var(--diff-4) 35%, transparent); }
#difficulty-options .option-btn[data-difficulty="1"].selected { border-color: var(--diff-1); box-shadow: 0 0 0 1px var(--diff-1) inset; }
#difficulty-options .option-btn[data-difficulty="2"].selected { border-color: var(--diff-2); box-shadow: 0 0 0 1px var(--diff-2) inset; }
#difficulty-options .option-btn[data-difficulty="3"].selected { border-color: var(--diff-3); box-shadow: 0 0 0 1px var(--diff-3) inset; }
#difficulty-options .option-btn[data-difficulty="4"].selected { border-color: var(--diff-4); box-shadow: 0 0 0 1px var(--diff-4) inset; }

.opt-title { font-weight: 700; font-size: 1.05rem; }
.opt-desc { font-size: 0.82rem; color: var(--text-dim); }

.primary-btn {
  display: block;
  width: 100%;
  margin-top: 8px;
  padding: 14px;
  font-size: 1.1rem;
  font-weight: 700;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: #06231f;
  cursor: pointer;
  transition: background 0.15s, opacity 0.15s;
}
.primary-btn:hover:not(:disabled) { background: var(--accent-dark); }
.primary-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.back-link { text-align: center; margin-top: 16px; font-size: 0.9rem; }
.back-link a { color: var(--text-dim); text-decoration: none; }
.back-link a:hover { color: var(--accent); }

.how-to {
  border: 1px solid var(--panel-light);
  border-radius: 8px;
  margin: 20px auto 0;
  background: var(--panel);
  max-width: 520px;
  width: 100%;
  text-align: left;
}

.how-to-summary {
  display: block;
  padding: 10px 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.how-to-summary::-webkit-details-marker { display: none; }
.how-to-summary::before {
  content: "\25B8";
  display: inline-block;
  margin-right: 8px;
  transition: transform 0.2s;
}
details.how-to[open] > .how-to-summary::before { transform: rotate(90deg); }
.how-to-summary:hover { color: var(--text); }

.how-to-body { padding: 0 16px 12px; }
.how-to-body p {
  font-size: 0.9rem;
  color: var(--text-dim);
  line-height: 1.55;
  margin: 0 0 10px;
}
.how-to-body p:last-child { margin-bottom: 0; }
.how-to-body strong { color: var(--text); }

.text-btn {
  background: none; border: none;
  color: var(--text-dim); cursor: pointer;
  font-size: 0.95rem; text-decoration: underline;
}
.text-btn:hover { color: var(--text); }

/* ---- Game header ---- */
.game-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.hud {
  display: flex;
  gap: 18px;
  font-weight: 600;
  color: var(--text-dim);
}

#score-counter { color: var(--accent); }

.prompt {
  text-align: center;
  margin-bottom: 8px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.prompt-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-dim);
}

.prompt-text { font-size: 1.15rem; font-weight: 700; }

/* ---- Dial ---- */
.dial-wrap {
  position: relative;
  width: min(600px, 100%, calc(100vh - 260px));
  min-width: 260px;
  aspect-ratio: 1;
  margin: 0 auto;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.dial {
  position: absolute;
  inset: 6.25%;
  border-radius: 50%;
  overflow: hidden;
  background: var(--ocean);
  cursor: grab;
  box-shadow: 0 0 0 2px var(--panel-light), 0 10px 40px rgba(0, 0, 0, 0.5);
  /* Keeps the circular clip crisp in Safari while children are transformed. */
  isolation: isolate;
}
.dial-wrap.dragging .dial { cursor: grabbing; }
.dial-wrap.locked .dial { cursor: default; }

.rotor {
  position: absolute;
  inset: 0;
}

.tiles {
  position: absolute;
  inset: 0;
}
.tiles canvas {
  position: absolute;
  display: block;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s;
}
.tiles canvas.ready { opacity: 1; }

#map-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
}

.ring {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  overflow: visible;
}

.ring .tick { stroke: var(--panel-light); stroke-width: 2; }
.ring .tick.major { stroke: var(--text-dim); stroke-width: 3; }
.ring .north-mark { fill: var(--accent); }
.ring .north-label {
  fill: var(--bg);
  font-weight: 800;
  font-size: 22px;
  text-anchor: middle;
  dominant-baseline: central;
}
.ring .you-mark { fill: var(--you); }
.ring .you-label {
  fill: var(--you);
  font-weight: 700;
  font-size: 18px;
  text-anchor: middle;
  dominant-baseline: central;
}
.ring .err-arc { fill: none; stroke: var(--you); stroke-width: 6; stroke-linecap: round; opacity: 0.8; }
.ring .true-mark { fill: var(--correct); }

/* ---- Map geometry ---- */
.land { fill: var(--land); stroke: none; }
.borders { fill: none; stroke: var(--land-stroke); stroke-width: 1.2; stroke-linejoin: round; }
.coast { fill: none; stroke: #5b6f86; stroke-width: 0.8; stroke-linejoin: round; }
.lake { fill: var(--ocean); stroke: #5b6f86; stroke-width: 0.6; }
.home { fill: #4a5d74; }

.sat .borders { stroke: rgba(255, 255, 255, 0.55); stroke-width: 1; }

.labels { transition: opacity 0.5s; }
.labels.off { opacity: 0; }
.labels text {
  fill: var(--text);
  font-weight: 600;
  text-anchor: middle;
  paint-order: stroke;
  stroke: rgba(10, 16, 24, 0.85);
  stroke-width: 3px;
  stroke-linejoin: round;
  pointer-events: none;
}

.centre-dot { fill: var(--you); stroke: #fff; stroke-width: 1.5; }

/* ---- Controls ---- */
.controls {
  display: flex;
  gap: 8px;
  align-items: stretch;
  justify-content: center;
  margin: 14px auto 0;
  max-width: 600px;
}

.rot-btn {
  background: var(--panel);
  border: 1px solid var(--panel-light);
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
  font-size: 0.95rem;
  padding: 0 12px;
  margin-top: 8px;
  white-space: nowrap;
  transition: border-color 0.15s;
}
.rot-btn:hover { border-color: var(--accent); }

.submit-btn { flex: 1; min-width: 0; }

/* ---- Result ---- */
.result-detail {
  max-width: 600px;
  margin: 14px auto 0;
  background: var(--panel);
  border-radius: 10px;
  padding: 14px 16px;
}

.result-headline {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 4px;
}
.result-headline.great { color: var(--correct); }
.result-headline.good  { color: #facc15; }
.result-headline.okay  { color: #fb923c; }
.result-headline.miss  { color: var(--incorrect); }

.result-facts { color: var(--text-dim); font-size: 0.95rem; line-height: 1.5; }
.result-facts strong { color: var(--text); }

/* ---- Results screen ---- */
.final-score {
  text-align: center;
  font-size: 2rem;
  color: var(--accent);
  font-weight: 800;
  margin-bottom: 4px;
}

.final-avg {
  text-align: center;
  color: var(--text-dim);
  margin-top: 0;
  margin-bottom: 20px;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0 auto 20px;
  max-width: 600px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border-radius: 8px;
  padding: 10px 14px;
}

.result-row .name-col { font-weight: 600; }
.result-row .diff-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  margin-right: 8px;
  vertical-align: middle;
}
.result-row .dist-col { color: var(--text-dim); font-size: 0.88rem; margin-left: auto; }
.result-row .pts-col  { color: var(--accent); font-weight: 700; min-width: 64px; text-align: right; }

.results-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  max-width: 600px;
  margin: 0 auto;
}

/* ---- Loading ---- */
#loading-overlay {
  position: fixed; inset: 0;
  background: var(--bg);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 16px; color: var(--text-dim); z-index: 100;
}
#loading-overlay.hidden { display: none; }

.spinner {
  width: 40px; height: 40px;
  border: 4px solid var(--panel-light);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

@media (max-width: 600px) {
  #app { padding: 16px; }
  h1 { font-size: 1.7rem; }
  .options-grid { grid-template-columns: 1fr; }
  .rot-btn { padding: 0 8px; font-size: 0.85rem; }
  .controls .rot-btn:nth-child(2), .controls .rot-btn:nth-child(4) { display: none; }
}