:root {
  --green-900: #0b3d2e;
  --green-700: #14532d;
  --green-600: #1a7a4c;
  --green-500: #22a262;
  --green-100: #e5f5ec;
  --green-50: #f3faf6;
  --ink: #1f2a24;
  --muted: #5c6b63;
  --border: #d9e6de;
  --amber: #b5750a;
  --amber-bg: #fdf3e0;
  --danger: #b3261e;
  --card-bg: #ffffff;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(15, 40, 26, 0.06), 0 4px 14px rgba(15, 40, 26, 0.06);
  font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--green-50);
  color: var(--ink);
  line-height: 1.5;
}

a { color: var(--green-600); }

header.site-header {
  background: linear-gradient(120deg, var(--green-900), var(--green-600));
  color: #fff;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: var(--green-700);
  font-size: 18px;
  flex-shrink: 0;
}

.brand-text h1 {
  margin: 0;
  font-size: 20px;
  letter-spacing: 0.2px;
}

.brand-text p {
  margin: 2px 0 0;
  font-size: 12.5px;
  opacity: 0.9;
}

nav.site-nav {
  display: flex;
  gap: 8px;
}

nav.site-nav a {
  color: #fff;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.12);
}

nav.site-nav a.active,
nav.site-nav a:hover {
  background: rgba(255, 255, 255, 0.28);
}

main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 24px 20px 64px;
}

.intro-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}

.intro-card h2 { margin-top: 0; }

.badge {
  display: inline-block;
  background: var(--green-100);
  color: var(--green-700);
  font-size: 12px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 999px;
  letter-spacing: 0.3px;
  text-transform: uppercase;
  margin-bottom: 10px;
}

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

section.panel h2 {
  margin-top: 0;
  font-size: 18px;
  color: var(--green-700);
  display: flex;
  align-items: center;
  gap: 8px;
}

section.panel h2 .step {
  background: var(--green-600);
  color: #fff;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
}

.panel-desc {
  color: var(--muted);
  font-size: 13.5px;
  margin-top: -6px;
  margin-bottom: 16px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px 18px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
}

.field .hint {
  font-size: 11.5px;
  color: var(--muted);
}

input[type="text"],
input[type="date"],
input[type="number"] {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: #fcfefd;
}

input:focus {
  outline: 2px solid var(--green-500);
  outline-offset: 1px;
}

.category-group {
  margin-bottom: 18px;
}

.category-group h3 {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  color: var(--green-700);
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
  margin-bottom: 10px;
}

table.consumables-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
}

table.consumables-table th {
  text-align: left;
  font-size: 11.5px;
  text-transform: uppercase;
  color: var(--muted);
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}

table.consumables-table td {
  padding: 6px 8px;
  border-bottom: 1px solid #eef4f0;
  vertical-align: middle;
}

table.consumables-table tr.flagship td { background: var(--amber-bg); }

table.consumables-table input[type="number"] {
  width: 100px;
}

.co2-cell { font-variant-numeric: tabular-nums; color: var(--green-700); font-weight: 600; }

.actions-bar {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin: 24px 0;
  align-items: center;
}

button {
  font-family: inherit;
  font-size: 14.5px;
  font-weight: 700;
  padding: 12px 22px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
}

button.primary {
  background: var(--green-600);
  color: #fff;
}
button.primary:hover { background: var(--green-700); }

button.secondary {
  background: #fff;
  color: var(--green-700);
  border: 1.5px solid var(--green-500);
}
button.secondary:hover { background: var(--green-100); }

button:disabled { opacity: 0.5; cursor: not-allowed; }

#results.hidden { display: none; }

.result-hero {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
  margin: 16px 0 20px;
}

.result-tile {
  background: var(--green-50);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  text-align: left;
}

.result-tile .label {
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.3px;
  color: var(--muted);
  font-weight: 700;
}

.result-tile .value {
  font-size: 21px;
  font-weight: 800;
  color: var(--green-700);
  margin-top: 4px;
}

.result-tile .unit {
  font-size: 12px;
  color: var(--muted);
}

.highlight-box {
  border: 1.5px solid var(--amber);
  background: var(--amber-bg);
  border-radius: var(--radius);
  padding: 16px 18px;
  margin: 18px 0;
}

.highlight-box h3 {
  margin: 0 0 6px;
  color: var(--amber);
  font-size: 15px;
}

.bar-row {
  display: grid;
  grid-template-columns: 130px 1fr 90px;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 13.5px;
}

.bar-track {
  background: #eef4f0;
  border-radius: 999px;
  height: 14px;
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--green-500), var(--green-700));
}

.bar-row.top .bar-fill { background: linear-gradient(90deg, #d98c0f, var(--amber)); }

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 22px;
}

@media (max-width: 720px) {
  .two-col { grid-template-columns: 1fr; }
}

.top-items-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin-top: 10px;
}
.top-items-table th {
  text-align: left;
  font-size: 11.5px;
  text-transform: uppercase;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding: 6px 8px;
}
.top-items-table td {
  padding: 6px 8px;
  border-bottom: 1px solid #eef4f0;
}

.disclaimer {
  font-size: 12px;
  color: var(--muted);
  border-top: 1px dashed var(--border);
  margin-top: 20px;
  padding-top: 14px;
}

footer.site-footer {
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
  padding: 30px 20px 40px;
}

/* About page */
.about-content h2 { color: var(--green-700); }
.about-content .authors {
  background: var(--green-50);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.about-content .authors ol { margin: 8px 0 0; padding-left: 20px; }
.about-content .authors li { margin-bottom: 6px; font-size: 14px; }
.about-content blockquote {
  border-left: 3px solid var(--green-500);
  margin: 0;
  padding: 6px 0 6px 16px;
  color: var(--muted);
  font-style: italic;
}

.factor-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  margin: 10px 0 20px;
}
.factor-table th {
  text-align: left;
  background: var(--green-100);
  color: var(--green-700);
  padding: 8px 10px;
}
.factor-table td {
  padding: 7px 10px;
  border-bottom: 1px solid #eef4f0;
}