:root {
  --bg: #f6f6ef;
  --surface: #ffffff;
  --ink: #1d2a1f;
  --muted: #516152;
  --accent: #2f8f63;
  --accent-ink: #0f3b2a;
  --border: #dde3d7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 5% 10%, #e8f5de 0 18%, transparent 30%),
    radial-gradient(circle at 95% 90%, #f4e3ca 0 16%, transparent 30%),
    var(--bg);
}

.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}

.hero {
  margin-bottom: 2rem;
}

.eyebrow {
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-ink);
  font-size: 0.8rem;
  margin-bottom: 0.25rem;
}

h1 {
  margin: 0;
  font-family: "Baskerville", "Times New Roman", serif;
  font-size: clamp(1.9rem, 3vw, 2.8rem);
}

.subtitle {
  color: var(--muted);
  max-width: 70ch;
}

.inline-link {
  color: var(--accent-ink);
  font-weight: 700;
}

.page-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin: 0.75rem 0 1.25rem;
}

.page-links a {
  display: inline-block;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--accent-ink);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.88rem;
  font-weight: 700;
}

.worked-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.worked-grid article {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0.75rem;
  background: #fbfdf9;
}

.decision-list {
  margin: 0;
  padding-left: 1.1rem;
  line-height: 1.5;
}

.analysis-section {
  margin-bottom: 2.5rem;
}

.analysis-header {
  margin-bottom: 1rem;
}

.analysis-header h2 {
  margin: 0;
  font-family: "Baskerville", "Times New Roman", serif;
  font-size: clamp(1.3rem, 2.2vw, 1.8rem);
}

.section-subtitle {
  color: var(--muted);
  margin: 0.25rem 0 0;
}

.form-panel h3,
.results-panel h3 {
  margin-top: 0;
}

.metrics h4 {
  font-size: 0.85rem;
  margin: 0 0 0.4rem;
  color: var(--muted);
  font-weight: 600;
}

.layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1rem;
  box-shadow: 0 10px 25px rgba(23, 34, 22, 0.06);
}

.form-panel label {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.75rem;
  font-size: 0.92rem;
}

input {
  width: 100%;
  border: 1px solid #cfd8ca;
  border-radius: 10px;
  font-size: 1rem;
  padding: 0.55rem 0.65rem;
}

button {
  border: 0;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  padding: 0.65rem 1rem;
  font-weight: 700;
  cursor: pointer;
}

button:hover {
  filter: brightness(0.95);
}

.error {
  color: #a31818;
  min-height: 1.2rem;
  margin-top: 0.5rem;
}

/* Unit toggle (MJ / kWh) */

.unit-fieldset {
  border: none;
  margin: 0 0 0.75rem;
  padding: 0;
}

.unit-fieldset legend {
  font-size: 0.92rem;
  margin-bottom: 0.35rem;
  padding: 0;
}

.unit-toggle {
  display: inline-flex;
  border: 1px solid #cfd8ca;
  border-radius: 999px;
  overflow: hidden;
  margin-bottom: 0.45rem;
  font-size: 0.85rem;
}

.unit-option {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.3rem 0.75rem;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.unit-option:has(input:checked) {
  background: var(--accent);
  color: #fff;
}

.unit-option input[type="radio"] {
  appearance: none;
  width: 0;
  height: 0;
  margin: 0;
  position: absolute;
}

.unit-fieldset input[type="number"] {
  width: 100%;
  border: 1px solid #cfd8ca;
  border-radius: 10px;
  font-size: 1rem;
  padding: 0.55rem 0.65rem;
}

.metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.metrics article {
  border: 1px dashed #d7ddcf;
  border-radius: 12px;
  padding: 0.7rem;
}

.metrics article.full-row-card {
  grid-column: 1 / -1;
}

.metrics .diff {
  border-style: solid;
  background: #f7faf5;
}

.metrics .diff-secondary {
  text-align: right;
}

.metrics p {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
}

@media (max-width: 850px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .worked-grid {
    grid-template-columns: 1fr;
  }
}

/* Grid intensity reference table */

.info-section {
  margin-bottom: 2.5rem;
}

.intensity-table {
  display: table;
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

.intensity-row {
  display: table-row;
}

.intensity-row span {
  display: table-cell;
  padding: 0.55rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.intensity-head span {
  font-weight: 700;
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-bottom: 2px solid var(--border);
}

.intensity-value {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}

.intensity-source {
  color: var(--muted);
  font-size: 0.85rem;
}

.intensity-avg span {
  background: #f0f4ee;
  font-style: italic;
}

.ref-subsection {
  margin-bottom: 2rem;
}

.ref-subsection h3 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 700;
}

.ref-note {
  color: var(--muted);
  font-size: 0.87rem;
  margin: 0 0 0.6rem;
  line-height: 1.5;
}