: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;

  --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: 1200px;
  margin: 0 auto;
  padding: 20px;
  min-height: 100vh;
}

.screen { display: none; }
.screen.active { display: block; }

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-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; }
.primary-btn.hidden { display: none; }

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

.how-to {
  border: 1px solid var(--panel-light);
  border-radius: 8px;
  margin-top: 20px;
  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); }

.hud-toggle {
  background: var(--panel);
  border: 1px solid var(--panel-light);
  border-radius: 6px;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 0.85rem;
  padding: 4px 10px;
  transition: border-color 0.15s, color 0.15s;
}
.hud-toggle:hover { border-color: var(--accent); color: var(--text); }
.hud-toggle.active { border-color: var(--accent); color: var(--accent); }

#map-svg.pannable { cursor: grab; }
#map-svg.pannable:active { cursor: grabbing; }

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

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

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

/* ---- Game layout: photo + map side by side ---- */
.game-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 16px;
  margin-bottom: 14px;
}

/* ---- Photo panel ---- */
.photo-panel {
  background: var(--panel);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--panel-light);
  display: flex;
  flex-direction: column;
}

.photo-zoom-wrap {
  position: relative;
  overflow: hidden;
  flex: 1;
  min-height: 420px;
  background: var(--panel-light);
  cursor: default;
}

.photo-zoom-wrap.zoomed { cursor: grab; }
.photo-zoom-wrap.zoomed:active { cursor: grabbing; }

#landmark-photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform-origin: 0 0;
  will-change: transform;
  user-select: none;
  pointer-events: none;
}

.photo-zoom-hint {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 22, 32, 0.75);
  color: var(--text-dim);
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  pointer-events: none;
  white-space: nowrap;
  transition: opacity 0.4s;
}
.photo-zoom-hint.hidden { opacity: 0; }

.landmark-prompt {
  padding: 12px 16px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 48px;
}

.landmark-name {
  font-size: 1.3rem;
  font-weight: 800;
  line-height: 1.2;
}
.landmark-name.hidden { display: none; }

.country-hint {
  font-size: 0.95rem;
  color: var(--text-dim);
  font-style: italic;
}
.country-hint.hidden { display: none; }

/* ---- Map panel ---- */
.map-panel { display: flex; flex-direction: column; }

.map-wrap {
  position: relative;
  background: var(--ocean);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid #233044;
  cursor: crosshair;
  flex: 1;
}

#map-svg {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 400px;
}

.click-hint {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(15, 22, 32, 0.85);
  color: var(--text-dim);
  font-size: 0.85rem;
  padding: 6px 14px;
  border-radius: 20px;
  pointer-events: none;
  transition: opacity 0.3s;
}
.click-hint.hidden { opacity: 0; }

.feedback-banner {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
  white-space: nowrap;
}
.feedback-banner.great { background: #4ade80; color: #06270f; }
.feedback-banner.good  { background: #facc15; color: #1a1000; }
.feedback-banner.okay  { background: #fb923c; color: #200e00; }
.feedback-banner.miss  { background: var(--incorrect); color: #2a0606; }
.feedback-banner.hidden { display: none; }

/* ---- Action bar ---- */
.action-bar {
  display: flex;
  gap: 12px;
}
.action-bar .primary-btn { margin-top: 0; }

/* ---- Result detail ---- */
.result-detail {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 14px;
  padding: 14px;
  background: var(--panel);
  border-radius: 10px;
  font-size: 1.1rem;
  font-weight: 600;
}
.result-detail.hidden { display: none; }

#distance-display { color: var(--text-dim); }
.country-reveal { color: var(--text); font-style: italic; }
.country-reveal.hidden { display: none; }
#points-display { color: var(--accent); font-size: 1.3rem; }

/* ---- 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);
  font-size: 1rem;
  margin-top: 0;
  margin-bottom: 20px;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--panel);
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.95rem;
}

.result-row .city-col { font-weight: 600; }
.result-row .dist-col { color: var(--text-dim); font-size: 0.88rem; }
.result-row .pts-col  { color: var(--accent); font-weight: 700; min-width: 60px; text-align: right; }

/* ---- Map geometry ---- */
.country-path {
  fill: var(--land);
  stroke: var(--land-stroke);
  stroke-width: 0.2;
}

.lake-path {
  fill: var(--ocean);
  stroke: var(--land-stroke);
  stroke-width: 0.3;
  pointer-events: none;
}

.guess-line {
  stroke: rgba(255,255,255,0.35);
  stroke-width: 1.5;
  stroke-dasharray: 4 3;
  fill: none;
}

.perfect-circle {
  fill: rgba(74, 222, 128, 0.08);
  stroke: #4ade80;
  stroke-width: 1.5;
  stroke-dasharray: 5 4;
  vector-effect: non-scaling-stroke;
}

/* ---- Loading overlay ---- */
#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: 768px) {
  .game-layout { grid-template-columns: 1fr; }
  #landmark-photo { height: 200px; }
}

@media (max-width: 600px) {
  .options-grid { grid-template-columns: 1fr; }
  h1 { font-size: 1.6rem; }
}

/* ---- Duels HUD ---- */
.duel-hud {
  display: flex;
  align-items: center;
  gap: 12px;
}

.duel-player-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 4px 12px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  opacity: 0.5;
  transition: border-color 0.15s, opacity 0.15s;
  min-width: 80px;
}

.duel-player-chip.active {
  border-color: var(--accent);
  opacity: 1;
}

.duel-player-name {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  max-width: 100px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.duel-player-score {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text);
  line-height: 1.2;
}

.duel-vs {
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* ---- Modals ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal-overlay.hidden { display: none; }

.modal-box {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  max-width: 440px;
  width: 90%;
}

.modal-box h2 { margin: 0 0 1rem; }

.modal-box ul {
  padding-left: 1.25rem;
  margin: 0 0 1.5rem;
  line-height: 1.8;
}

.player-name-input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.6rem 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 1rem;
}

.player-name-input:focus {
  outline: none;
  border-color: var(--accent);
}

.option-btn-toggle {
  width: 100%;
  text-align: left;
}

body.duels-mode #difficulty-setup-group { display: none; }