*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #f0f2f8;
  --surface: #ffffff;
  --border: #e0e3ef;
  --text: #1a1a2e;
  --muted: #666;
  --radius: 12px;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  text-align: center;
  padding: 28px 20px 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 4px rgba(0,0,0,.06);
}
header h1 {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.subtitle {
  color: var(--muted);
  font-size: .9rem;
  margin-top: 4px;
}

/* Layout */
main { flex: 1; }
#layout {
  display: flex;
  gap: 0;
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 16px;
  align-items: flex-start;
}

/* Parties panel */
#parties-panel {
  width: 300px;
  flex-shrink: 0;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
}

#parties {
  padding: 8px 0;
}

.bloc-group {
  border-bottom: 1px solid var(--border);
}
.bloc-group:last-child { border-bottom: none; }

.bloc-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 14px 8px;
  background: #fafbff;
  border-bottom: 1px solid var(--border);
}
.bloc-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.bloc-label {
  font-weight: 600;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  flex: 1;
  color: var(--text);
}
.bloc-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 6px;
  width: 22px;
  height: 22px;
  font-size: .9rem;
  cursor: pointer;
  line-height: 1;
  color: var(--muted);
  transition: background .15s, color .15s;
  display: flex;
  align-items: center;
  justify-content: center;
}
.bloc-toggle:hover { background: #eef; color: var(--text); }

.bloc-items { padding: 4px 0; }

.party-label {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  cursor: pointer;
  font-size: .88rem;
  transition: background .1s;
  user-select: none;
}
.party-label:hover { background: #f5f7ff; }

.party-label input[type="checkbox"] {
  width: 15px;
  height: 15px;
  accent-color: #1565C0;
  cursor: pointer;
  flex-shrink: 0;
}
.color-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
  border: 1px solid rgba(0,0,0,.12);
}
.party-name { flex: 1; color: var(--text); }
.party-seats {
  font-variant-numeric: tabular-nums;
  font-size: .82rem;
  color: var(--muted);
  min-width: 28px;
  text-align: right;
}

/* Viz panel */
#viz-panel {
  flex: 1;
  min-width: 0;
  padding-left: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

#hemicycle {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 16px 16px 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
}
#hemicycle svg {
  width: 100%;
  height: auto;
  display: block;
}

/* Results */
#results {
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 20px 24px;
  box-shadow: 0 2px 8px rgba(0,0,0,.05);
}

#result-row {
  display: flex;
  gap: 32px;
  margin-bottom: 18px;
}
.result-block {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.result-number {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}
.result-label {
  font-size: .8rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.has-majority { color: #2E7D32; }
.no-majority  { color: #C62828; }

/* Progress bar */
#progress-bar {
  position: relative;
  background: #e8eaf6;
  border-radius: 6px;
  height: 10px;
  overflow: visible;
}
#progress-fill {
  height: 100%;
  border-radius: 6px;
  background: #1565C0;
  transition: width .35s ease, background .35s ease;
  max-width: 100%;
}
#progress-track-marker {
  position: absolute;
  top: -4px;
  width: 2px;
  height: 18px;
  background: #333;
  border-radius: 1px;
  transform: translateX(-50%);
}
#progress-label {
  margin-top: 7px;
  font-size: .82rem;
  color: var(--muted);
}

/* Tooltip */
.arc-tooltip {
  display: none;
  position: fixed;
  pointer-events: none;
  background: rgba(10, 10, 30, .88);
  color: #fff;
  border-radius: 8px;
  padding: 8px 12px;
  font-size: .84rem;
  line-height: 1.5;
  z-index: 9999;
  white-space: nowrap;
  backdrop-filter: blur(4px);
}

/* Footer */
footer {
  text-align: center;
  padding: 16px;
  font-size: .8rem;
  color: var(--muted);
  border-top: 1px solid var(--border);
  background: var(--surface);
}
footer a { color: #555; font-weight: 600; text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* Responsive */
@media (max-width: 720px) {
  #layout {
    flex-direction: column;
    padding: 12px;
    gap: 16px;
  }
  #parties-panel { width: 100%; }
  #viz-panel { padding-left: 0; }
}