:root {
  --bg: #f7f9f8;
  --surface: #ffffff;
  --border: #dfe5e2;
  --text: #16211c;
  --text-muted: #5b6b63;
  --accent: #0a7a5c;
  --accent-dark: #06563f;
  --accent-soft: #e4f5ee;
  --result-bg: #0a7a5c;
  --result-text: #ffffff;
  --shadow: 0 1px 3px rgba(16, 30, 24, 0.08), 0 1px 2px rgba(16, 30, 24, 0.06);
  --radius: 12px;
  --max-width: 780px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1512;
    --surface: #161f1a;
    --border: #29352e;
    --text: #eef3f0;
    --text-muted: #9fb0a7;
    --accent: #3ddc9a;
    --accent-dark: #2bb583;
    --accent-soft: #14261e;
    --result-bg: #14261e;
    --result-text: #3ddc9a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

header.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
header.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
  gap: 12px;
  flex-wrap: wrap;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
  text-decoration: none;
}
.brand span { color: var(--accent); }
nav.site-nav {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
nav.site-nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.92rem;
}
nav.site-nav a:hover { color: var(--accent); }

main { padding: 36px 0 64px; }

h1 {
  font-size: 1.7rem;
  line-height: 1.25;
  margin: 0 0 10px;
}
h2 {
  font-size: 1.2rem;
  margin: 32px 0 12px;
}
.subtitle {
  color: var(--text-muted);
  font-size: 1.02rem;
  margin: 0 0 28px;
  max-width: 60ch;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.field {
  margin-bottom: 16px;
}
.field label {
  display: block;
  font-size: 0.88rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--text);
}
.field .hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}
select, input[type="number"] {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.98rem;
}
select:focus, input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 520px) {
  .field-row { grid-template-columns: 1fr; }
}

.checkbox-field {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.88rem;
  color: var(--text-muted);
}
.checkbox-field input { width: auto; }

.results {
  background: var(--result-bg);
  color: var(--result-text);
  border-radius: var(--radius);
  padding: 22px 24px;
  margin-top: 4px;
}
.results h3 {
  margin: 0 0 14px;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  opacity: 0.85;
}
.result-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px 20px;
}
@media (max-width: 480px) {
  .result-grid { grid-template-columns: 1fr; }
}
.result-item .value {
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.2;
}
.result-item .label {
  font-size: 0.82rem;
  opacity: 0.85;
  margin-top: 2px;
}

.compare-bars { margin-top: 6px; }
.compare-row {
  margin-bottom: 14px;
}
.compare-row .compare-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.86rem;
  margin-bottom: 5px;
  color: var(--text-muted);
}
.bar-track {
  height: 14px;
  background: var(--border);
  border-radius: 7px;
  overflow: hidden;
}
.bar-fill {
  height: 100%;
  border-radius: 7px;
}
.bar-fill.ev { background: var(--accent); }
.bar-fill.fuel { background: #c96a3b; }

.tool-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 8px;
}
@media (max-width: 560px) {
  .tool-grid { grid-template-columns: 1fr; }
}
.tool-card {
  display: block;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
}
.tool-card h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  color: var(--accent-dark);
}
.tool-card p {
  margin: 0;
  font-size: 0.88rem;
  color: var(--text-muted);
}

.faq dt {
  font-weight: 600;
  margin-top: 16px;
}
.faq dd {
  margin: 6px 0 0;
  color: var(--text-muted);
}

.disclaimer {
  font-size: 0.82rem;
  color: var(--text-muted);
  background: var(--accent-soft);
  border-radius: 10px;
  padding: 14px 16px;
  margin-top: 28px;
}

footer.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0 48px;
  color: var(--text-muted);
  font-size: 0.82rem;
}
footer.site-footer a { color: var(--text-muted); }

a { color: var(--accent-dark); }