:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-strong: #eef3f5;
  --text: #17212b;
  --muted: #61707e;
  --border: #d7e0e6;
  --accent: #0f766e;
  --accent-dark: #0b5f59;
  --accent-soft: #dff4f1;
  --warning: #9a5b13;
  --warning-soft: #fff3d8;
  --shadow: 0 14px 34px rgba(18, 29, 40, 0.08);
  --radius: 8px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

a {
  color: inherit;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 20;
  background: var(--text);
  color: #fff;
  padding: 0.5rem 0.75rem;
  border-radius: 4px;
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(12px);
}

.nav,
.container {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
}

.nav {
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  font-weight: 850;
  text-decoration: none;
  letter-spacing: 0;
}

.nav-links,
.footer-grid nav {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.95rem;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--text);
}

.hero {
  background: linear-gradient(180deg, #ffffff 0%, #edf6f4 100%);
  border-bottom: 1px solid var(--border);
  padding: 58px 0 48px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: 2rem;
  align-items: center;
}

.eyebrow {
  color: var(--accent-dark);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  margin: 0 0 0.75rem;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  font-size: clamp(2.25rem, 5vw, 4.45rem);
  line-height: 1.03;
  max-width: 820px;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  line-height: 1.18;
  margin-bottom: 0.75rem;
}

h3 {
  line-height: 1.2;
}

.lead {
  color: var(--muted);
  font-size: 1.16rem;
  max-width: 700px;
}

.hero-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.button {
  align-items: center;
  border-radius: 6px;
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  font: inherit;
  font-weight: 780;
  justify-content: center;
  min-height: 44px;
  padding: 0.65rem 1rem;
  text-decoration: none;
}

.button.primary {
  background: var(--accent);
  color: #fff;
}

.button.primary:hover {
  background: var(--accent-dark);
}

.button.secondary {
  background: var(--surface);
  border-color: var(--border);
  color: var(--text);
}

.section {
  padding: 56px 0;
}

.subdued {
  background: var(--surface-strong);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.narrow {
  max-width: 790px;
}

.two-column,
.content-grid,
.calculator-layout,
.three-column {
  display: grid;
  gap: 1.25rem;
}

.two-column,
.content-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.three-column {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.calculator-layout {
  grid-template-columns: minmax(0, 1.08fr) minmax(310px, 0.92fr);
  align-items: start;
}

.feature-card,
.tool-panel,
.source-card,
.template-block,
.notice {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.feature-card,
.tool-panel,
.source-card,
.notice {
  padding: 1.35rem;
}

.summary-panel {
  display: grid;
  gap: 0.75rem;
}

.summary-row {
  align-items: center;
  border-bottom: 1px solid var(--border);
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  padding-bottom: 0.75rem;
}

.summary-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.summary-row span,
.muted,
.note {
  color: var(--muted);
}

.check-list,
.number-list {
  padding-left: 1.2rem;
}

.check-list li,
.number-list li {
  margin-bottom: 0.45rem;
}

.text-link {
  color: var(--accent-dark);
  font-weight: 850;
  text-underline-offset: 0.22em;
}

.calculator-form {
  display: grid;
  gap: 1.2rem;
}

.field-group {
  display: grid;
  gap: 0.55rem;
}

.field-group label {
  font-weight: 760;
}

input,
select {
  border: 1px solid var(--border);
  border-radius: 6px;
  font: inherit;
  min-height: 44px;
  padding: 0.55rem 0.7rem;
  width: 100%;
}

input[type="range"] {
  accent-color: var(--accent);
  padding: 0;
}

.range-row {
  align-items: center;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 80px;
  gap: 0.75rem;
}

.checkbox-row {
  align-items: flex-start;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 0.65rem;
}

.checkbox-row input {
  min-height: auto;
  width: auto;
  margin-top: 0.25rem;
}

.result-panel {
  position: sticky;
  top: 88px;
}

.result-score {
  color: var(--accent-dark);
  display: block;
  font-size: 2.9rem;
  line-height: 1;
  margin: 0.3rem 0 0.6rem;
}

.meter {
  background: #d9e3e7;
  border-radius: 999px;
  height: 14px;
  margin: 1rem 0 1.25rem;
  overflow: hidden;
}

.meter span {
  background: var(--accent);
  display: block;
  height: 100%;
  width: 0%;
}

.breakdown-list {
  display: grid;
  gap: 0.65rem;
  margin: 0 0 1rem;
}

.breakdown-list div {
  align-items: center;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  padding-bottom: 0.65rem;
  gap: 1rem;
}

.breakdown-list dt {
  color: var(--muted);
}

.breakdown-list dd {
  font-weight: 850;
  margin: 0;
  text-align: right;
}

.warning {
  background: var(--warning-soft);
  border-color: #f0d28b;
  color: #3f2a0b;
}

.warning strong {
  color: var(--warning);
}

.table-wrap {
  overflow-x: auto;
}

table {
  border-collapse: collapse;
  min-width: 720px;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.8rem;
  text-align: left;
  vertical-align: top;
}

th {
  background: var(--surface-strong);
  font-size: 0.9rem;
}

details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  margin-bottom: 0.75rem;
  padding: 0.85rem 1rem;
}

summary {
  cursor: pointer;
  font-weight: 850;
}

details p {
  color: var(--muted);
  margin: 0.75rem 0 0;
}

.site-footer {
  background: #17212b;
  color: #dce6ea;
  padding: 28px 0;
}

.footer-grid {
  align-items: center;
  display: flex;
  gap: 1rem;
  justify-content: space-between;
}

.site-footer p {
  margin: 0;
  max-width: 690px;
}

.site-footer a {
  color: #fff;
  text-decoration: none;
}

@media (max-width: 880px) {
  .nav,
  .footer-grid {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav {
    padding: 0.9rem 0;
  }

  .nav-links {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.4rem;
  }

  .hero {
    padding: 42px 0;
  }

  .hero-grid,
  .two-column,
  .content-grid,
  .calculator-layout,
  .three-column {
    grid-template-columns: 1fr;
  }

  .result-panel {
    position: static;
  }

  h1 {
    font-size: 2.35rem;
  }
}