:root {
  --color-bg: #f5f6f8;
  --color-card: #ffffff;
  --color-text: #1f2430;
  --color-muted: #5c6470;
  --color-border: #e1e4e9;
  --color-accent: #2a9d8f;
  --color-error: #b3261e;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.site-header {
  padding: 2.5rem 1.5rem 1.5rem;
  text-align: center;
}

.site-header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

.tagline {
  margin: 0;
  color: var(--color-muted);
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.5rem 3rem;
}

.card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

#zip-form label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.zip-form-row {
  display: flex;
  gap: 0.75rem;
}

#zip-input {
  flex: 1;
  min-width: 0;
  padding: 0.65rem 0.85rem;
  font-size: 1rem;
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

#zip-input:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}

button[type="submit"] {
  padding: 0.65rem 1.25rem;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--color-accent);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  white-space: nowrap;
}

button[type="submit"]:hover {
  background: #228177;
}

.error-message {
  margin: 0.75rem 0 0;
  color: var(--color-error);
  font-size: 0.9rem;
}

.results-header h2 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

.results-header p {
  margin: 0 0 1.5rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.results-body {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  align-items: center;
  justify-content: center;
}

.chart-wrap {
  width: 280px;
  height: 280px;
  flex-shrink: 0;
}

.fuel-mix-legend {
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
  min-width: 200px;
}

.fuel-mix-legend li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.35rem 0;
  font-size: 0.95rem;
}

.legend-swatch {
  width: 0.85rem;
  height: 0.85rem;
  border-radius: 3px;
  flex-shrink: 0;
}

.legend-pct {
  margin-left: auto;
  font-variant-numeric: tabular-nums;
  color: var(--color-muted);
}

#map-section h2 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

.muted-text {
  margin: 0 0 1.25rem;
  color: var(--color-muted);
  font-size: 0.95rem;
}

.map-layout {
  position: relative;
}

#plant-map {
  height: 420px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.plant-detail {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  width: min(280px, calc(100% - 1.5rem));
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 1rem 1.1rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  z-index: 1000;
}

.plant-detail h3 {
  margin: 0 0 0.6rem;
  padding-right: 1.25rem;
  font-size: 1.05rem;
}

.plant-detail dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.75rem;
  font-size: 0.88rem;
}

.plant-detail dt {
  color: var(--color-muted);
}

.plant-detail dd {
  margin: 0;
  text-align: right;
}

#plant-detail-close {
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  border: none;
  background: none;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-muted);
}

.map-legend {
  margin-top: 1.25rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
}

.map-legend li {
  width: auto;
}

.map-legend .legend-pct {
  display: none;
}

.site-footer {
  text-align: center;
  padding: 1.5rem;
  color: var(--color-muted);
  font-size: 0.85rem;
}

.site-footer a {
  color: var(--color-muted);
}

#utility-picker-section h2 {
  margin: 0 0 0.25rem;
  font-size: 1.35rem;
}

.utility-options-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.utility-option-btn {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 0.85rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.15s, background 0.15s;
}

.utility-option-btn:hover {
  border-color: var(--color-accent);
  background: #f0faf9;
}

.utility-option-name {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
}

.utility-option-ba {
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

#results-utility {
  margin: 0.25rem 0 1.25rem;
  color: var(--color-muted);
  font-size: 0.88rem;
}

@media (max-width: 480px) {
  .zip-form-row {
    flex-direction: column;
  }
}