: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;
  --highlight: #f6ad55;
  --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: 1000px;
  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; }

.option-btn.wide { grid-column: 1 / -1; }

.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(--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 screen ---------- */

.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); }

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

#map-svg {
  display: block;
  width: 100%;
  height: 50vh;
  max-height: 480px;
}

.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);
}

.feedback-banner.correct { background: var(--correct); color: #06270f; }
.feedback-banner.incorrect { background: var(--incorrect); color: #2a0606; }
.feedback-banner.hidden { display: none; }

.answer-area { margin-top: 18px; }

#question-text {
  text-align: center;
  font-size: 1.2rem;
  margin-bottom: 14px;
}

.answers { grid-template-columns: repeat(2, 1fr); }

.answer-btn {
  background: var(--panel);
  border: 2px solid transparent;
  border-radius: 10px;
  padding: 16px;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.answer-btn:hover:not(:disabled) {
  background: var(--panel-light);
  border-color: var(--accent);
}

.answer-btn:disabled { cursor: default; }
.answer-btn.correct { background: rgba(74, 222, 128, 0.18); border-color: var(--correct); }
.answer-btn.incorrect { background: rgba(248, 113, 113, 0.18); border-color: var(--incorrect); }

.answer-form { display: flex; gap: 10px; }
.answer-form.hidden { display: none; }

#answer-input {
  flex: 1;
  padding: 14px 16px;
  font-size: 1.05rem;
  border-radius: 10px;
  border: 2px solid var(--current-diff-color, var(--panel-light));
  background: var(--panel);
  color: var(--text);
  transition: border-color 0.2s, background 0.2s;
}

#answer-input:focus { outline: none; box-shadow: 0 0 0 2px var(--accent); }
#answer-input.correct { background: rgba(74, 222, 128, 0.16); }
#answer-input.incorrect { background: rgba(248, 113, 113, 0.16); }

#answer-form #submit-btn {
  width: auto;
  margin-top: 0;
  padding: 14px 24px;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.options-grid.answers.hidden { display: none; }
.feedback-banner.hidden { display: none; }

.final-score {
  text-align: center;
  font-size: 1.4rem;
  color: var(--accent);
  font-weight: 700;
}

/* ---------- Infinite hints ---------- */

.hint-area { display: flex; gap: 12px; margin-top: 10px; }
.hint-area.hidden { display: none; }

.hint-panel {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--panel);
  border: 1px solid var(--panel-light);
  border-radius: 10px;
  padding: 10px 16px;
  animation: hint-pop 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.hint-panel.hidden { display: none; }

@keyframes hint-pop {
  from { opacity: 0; transform: scale(0.9); }
  to   { opacity: 1; transform: scale(1); }
}

.abbr-value {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: 1px;
}

.hint-label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  display: block;
}

#capital-name {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text);
}

/* Attempt pip indicators */
.attempt-pips { display: flex; gap: 8px; justify-content: center; margin-bottom: 12px; }
.attempt-pips.hidden { display: none; }

.pip {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--text-dim);
  background: transparent;
  transition: background 0.2s, border-color 0.2s;
}

.pip.used    { background: var(--incorrect); border-color: var(--incorrect); }
.pip.correct { background: var(--correct);   border-color: var(--correct); }

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-6px); }
  40%       { transform: translateX(6px); }
  60%       { transform: translateX(-4px); }
  80%       { transform: translateX(4px); }
}

.shake { animation: shake 0.35s ease; }

body.mode-infinite #answer-method-group { display: none; }

/* ---------- Map geometry ---------- */

.state-path {
  fill: var(--land);
  stroke: var(--land-stroke);
  stroke-width: 0.5;
}

.state-path.target {
  fill: var(--highlight);
  stroke: #ffffff;
  stroke-width: 1;
}

.state-path.wrong-guess {
  fill: var(--incorrect);
  stroke: #ffffff;
  stroke-width: 1;
}

#wrong-guess-label {
  fill: #ffffff;
  font-size: 13px;
  font-weight: 700;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  paint-order: stroke;
  stroke: rgba(0,0,0,0.7);
  stroke-width: 3px;
  stroke-linejoin: round;
}

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

.nation-outline {
  fill: none;
  stroke: var(--land-stroke);
  stroke-width: 1;
}

.silhouette-path {
  fill: #cbd5e1;
  stroke: #475569;
  stroke-width: 0.75;
}

/* ---------- 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: 600px) {
  .options-grid { grid-template-columns: 1fr; }
  .answers { grid-template-columns: 1fr; }
  .option-btn.wide { grid-column: auto; }
  h1 { font-size: 1.6rem; }
}