/* ── CSS Custom Properties ─────────────────────────────────────────────────── */
:root {
  --bg: #0a0a0a;
  --bg-card: #141414;
  --bg-input: #1a1a1a;
  --border: #2a2a2a;
  --text: #e0e0e0;
  --text-muted: #888;
  --text-bright: #fff;
  --accent: #00e676;
  --accent-dim: #00c853;
  --danger: #ff5252;

  /* Sector colors */
  --sector-afolu: #4CAF50;
  --sector-buildings: #FF9800;
  --sector-energy: #F44336;
  --sector-industry: #9C27B0;
  --sector-transport: #2196F3;

  /* Energy source colors */
  --energy-coal: #8B4513;
  --energy-gas: #D2691E;
  --energy-fossil-other: #A0522D;
  --energy-solar: #FFD700;
  --energy-wind: #00BCD4;
  --energy-hydro: #2196F3;
  --energy-nuclear: #E91E63;
  --energy-bioenergy: #4CAF50;
  --energy-renewables-other: #66BB6A;

  --font-sans: 'DM Sans', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --radius: 8px;
  --transition: 200ms ease;
}

/* ── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Layout ───────────────────────────────────────────────────────────────── */
#app {
  max-width: 740px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.hidden { display: none !important; }

/* ── Header ───────────────────────────────────────────────────────────────── */
.header { text-align: center; margin-bottom: 1.5rem; }

.title {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ── Loading ──────────────────────────────────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 4rem 0;
  color: var(--text-muted);
}

.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Tabs ─────────────────────────────────────────────────────────────────── */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}

.tab {
  flex: 1;
  padding: 0.6rem 0.5rem;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}

.tab:hover { color: var(--text); }
.tab.active {
  color: var(--text-bright);
  border-bottom-color: var(--accent);
}

/* ── Chart Container ──────────────────────────────────────────────────────── */
.chart-container {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
  /* Sized to fit 26 GHG subsector rows readably; trajectory & energy
     charts have more empty room than needed, but the consistent height
     keeps tab-switching from making the page jump. */
  height: 540px;
  position: relative;
}

/* Absolute-position the tab panels so they fill the container — gives Chart.js
   a parent with a real, measured height. Without this the tab-panel collapses
   to the canvas's initial aspect-ratio guess, leaving empty space below. The
   inset replaces the chart-container's old padding (1rem desktop, 0.5rem mobile). */
.tab-panel {
  display: none;
  position: absolute;
  inset: 1rem;
}
.tab-panel.active { display: block; }

canvas { width: 100% !important; height: 100% !important; }

/* ── Hard-mode toggle ─────────────────────────────────────────────────────── */
.mode-toggle {
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.mode-toggle .switch {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
}
.mode-toggle .switch input {
  position: absolute;
  opacity: 0;
  width: 0; height: 0;
}
.mode-toggle .slider {
  position: relative;
  display: inline-block;
  width: 34px;
  height: 18px;
  background: #333;
  border-radius: 999px;
  transition: background 0.15s ease;
}
.mode-toggle .slider::before {
  content: "";
  position: absolute;
  left: 2px; top: 2px;
  width: 14px; height: 14px;
  background: #ccc;
  border-radius: 50%;
  transition: transform 0.15s ease;
}
.mode-toggle input:checked + .slider { background: var(--accent); }
.mode-toggle input:checked + .slider::before { transform: translateX(16px); background: #0a0a0a; }
.mode-toggle .mode-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text);
}
.mode-toggle .mode-hint {
  color: var(--text-muted);
  font-size: 0.75rem;
}
/* Disabled state when guesses have started — toggle locks. */
.mode-toggle.locked .switch { cursor: not-allowed; opacity: 0.55; }
.mode-toggle.locked input { pointer-events: none; }

/* ── Guess Area ───────────────────────────────────────────────────────────── */
.guess-area { margin-bottom: 1.25rem; }

.guess-counter {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  text-align: center;
}

.input-wrapper {
  display: flex;
  gap: 0.5rem;
  position: relative;
}

.guess-input {
  flex: 1;
  padding: 0.65rem 0.85rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-bright);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  outline: none;
  transition: border-color var(--transition);
}

.guess-input:focus { border-color: var(--accent); }
.guess-input:disabled { opacity: 0.5; cursor: not-allowed; }

.guess-btn {
  padding: 0.65rem 1.25rem;
  background: var(--accent);
  color: #000;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background var(--transition);
}

.guess-btn:hover { background: var(--accent-dim); }
.guess-btn:disabled { opacity: 0.4; cursor: not-allowed; }

/* ── Autocomplete ─────────────────────────────────────────────────────────── */
.autocomplete-list {
  position: absolute;
  top: 100%;
  left: 0;
  right: 70px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  max-height: 220px;
  overflow-y: auto;
  z-index: 100;
  list-style: none;
}

.autocomplete-list li {
  padding: 0.5rem 0.85rem;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background var(--transition);
}

.autocomplete-list li:hover,
.autocomplete-list li.highlighted {
  background: var(--border);
  color: var(--text-bright);
}

/* ── Country List Toggle ──────────────────────────────────────────────────── */
.country-list-toggle {
  text-align: center;
  margin-top: 0.5rem;
}

.show-countries-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.8rem;
  cursor: pointer;
  text-decoration: underline;
  transition: color var(--transition);
}

.show-countries-btn:hover { color: var(--text); }

.country-list-panel {
  margin-top: 0.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.75rem;
  max-height: 200px;
  overflow-y: auto;
}

.country-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.2rem 1rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ── History Table ────────────────────────────────────────────────────────── */
.history-wrapper {
  overflow-x: auto;
  margin-bottom: 1.25rem;
}

.history-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.history-table th {
  padding: 0.5rem 0.4rem;
  text-align: left;
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.history-table td {
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  white-space: nowrap;
}

.history-table tr:last-child td { border-bottom: none; }

/* Hard mode hides the geographic columns. */
.history-table.hard-mode .col-geo { display: none; }

.sim-high { color: var(--accent); }
.sim-mid  { color: #FFD700; }
.sim-low  { color: var(--danger); }

.arrow-up { color: var(--accent); }
.arrow-down { color: var(--danger); }

/* ── Result Panel ─────────────────────────────────────────────────────────── */
.result-panel {
  text-align: center;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 1.25rem;
}

/* (1) Reveal line — "Correct! The answer is X" / "The answer was X" */
.result-reveal {
  font-size: 1.1rem;
  margin-bottom: 0.85rem;
  line-height: 1.5;
}
.result-reveal .country-name {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--accent);
  font-size: 1.3rem;
}

/* (2) Climate fingerprint section — sits between the reveal and the outcome */
.result-fingerprint-section {
  margin: 0 auto 1rem;
  max-width: 560px;
  padding: 0.7rem 0.95rem;
  border-left: 3px solid var(--accent-dim);
  background: var(--bg-card, #161616);
  text-align: left;
}
.result-fingerprint-heading {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  margin: 0 0 0.35rem;
}
.result-fingerprint {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text);
}

/* (3) Outcome line — "You got it in N guesses!" / "Better luck tomorrow!" */
.result-outcome {
  font-size: 1rem;
  margin-bottom: 0.85rem;
  color: var(--text);
}

/* (4) Visible share grid (emojis + score) + copy button */
.result-share-block {
  margin: 0.25rem 0 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.result-share-preview {
  display: block;
  width: fit-content;
  margin: 0 0 0.9rem;
  padding: 0.7rem 1.1rem;
  background: var(--bg-card, #161616);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  line-height: 1.45;
  color: var(--text);
  text-align: center;
  white-space: pre;
}

.share-btn {
  padding: 0.55rem 1.2rem;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background var(--transition);
}

.share-btn:hover { background: var(--border); }

.share-copied {
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--accent);
}

/* ── About Section ────────────────────────────────────────────────────────── */
.about-section {
  margin-top: 2rem;
  margin-bottom: 1rem;
}

.about-toggle {
  display: block;
  margin: 0 auto;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  padding: 0.5rem 1.2rem;
  cursor: pointer;
  transition: color var(--transition), border-color var(--transition);
}

.about-toggle:hover {
  color: var(--text);
  border-color: var(--text-muted);
}

.about-content {
  margin-top: 1rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--text);
}

.about-content h2 {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-bottom: 0.75rem;
}

.about-content h3 {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-bright);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.about-content p {
  margin-bottom: 0.75rem;
}

.about-content ul {
  margin-bottom: 0.75rem;
  padding-left: 1.25rem;
}

.about-content li {
  margin-bottom: 0.4rem;
}

.about-content code {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  background: var(--bg-input);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
}

.about-content .credit {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border, #1e1e1e);
  font-size: 0.85rem;
  color: var(--text-muted);
  text-align: center;
  font-style: italic;
}

/* ── Footer ───────────────────────────────────────────────────────────────── */
.footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2rem;
  line-height: 1.7;
}

/* ── Responsive ───────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .title { font-size: 1.5rem; }
  .tab { font-size: 0.75rem; padding: 0.5rem 0.25rem; }
  .chart-container { height: 480px; }
  .tab-panel { inset: 0.5rem; }
  .history-table { font-size: 0.75rem; }
  .history-table th, .history-table td { padding: 0.4rem 0.3rem; }
  .country-list-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
}