:root {
  color-scheme: light;
  --bg: #f5f7f8;
  --surface: #ffffff;
  --surface-muted: #eef4f2;
  --ink: #111827;
  --muted: #5b6675;
  --line: #d9e1e5;
  --accent: #087568;
  --accent-dark: #064e47;
  --accent-warm: #a45612;
  --warning-bg: #fff8ed;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
  --radius: 8px;
  --content: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 86px;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.6;
}

body {
  padding-top: 72px;
}

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

.fixed-header {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  min-height: 72px;
  padding: 0 clamp(20px, 5vw, 72px);
  border-bottom: 1px solid rgba(217, 225, 229, 0.92);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(14px);
}

.brand {
  color: var(--ink);
  font-size: 0.98rem;
  font-weight: 850;
  text-decoration: none;
  white-space: nowrap;
}

.top-nav {
  display: flex;
  gap: 8px;
  margin-left: 18px;
}

.top-nav a,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 15px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 750;
  text-decoration: none;
  white-space: nowrap;
}

.top-nav a {
  border: 1px solid transparent;
  background: transparent;
  color: var(--ink);
}

.top-nav a:hover {
  border-color: var(--line);
  background: #f8fafb;
}

.site-header {
  padding: 54px clamp(20px, 5vw, 72px) 34px;
}

.hero-grid {
  max-width: var(--content);
  margin: 0 auto;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-warm);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  max-width: 860px;
  font-size: clamp(2.25rem, 5vw, 4.6rem);
}

h2 {
  font-size: clamp(1.35rem, 2vw, 1.9rem);
}

.lead {
  max-width: 760px;
  margin: 20px 0 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button.primary {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.button.secondary {
  border: 1px solid var(--line);
  background: #ffffff;
  color: var(--ink);
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 750;
}

main {
  max-width: var(--content);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 72px) 72px;
}

.tool-layout {
  display: grid;
  grid-template-columns: 360px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.calculator,
.results,
.content-section {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.calculator {
  display: grid;
  gap: 16px;
  padding: 22px;
  position: sticky;
  top: 16px;
}

.section-heading {
  margin-bottom: 8px;
}

.section-heading p {
  max-width: 720px;
  margin: 8px 0 0;
  color: var(--muted);
}

label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 750;
}

input[type="number"] {
  width: 100%;
  min-height: 44px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  font: inherit;
}

input[type="number"]:focus,
input[type="range"]:focus-visible,
a:focus-visible {
  outline: 3px solid rgba(8, 117, 104, 0.22);
  outline-offset: 2px;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

output {
  color: var(--ink);
  font-weight: 800;
}

.check-row {
  grid-template-columns: 20px 1fr;
  align-items: center;
  color: var(--ink);
}

.results,
.content-section {
  padding: 24px;
}

.best-choice {
  margin: 18px 0;
  padding: 16px;
  border: 1px solid #b7ddd5;
  border-radius: var(--radius);
  background: var(--surface-muted);
  color: var(--accent-dark);
  font-weight: 850;
}

.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  background: #ffffff;
}

th,
td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

th {
  background: #f8fafb;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

td {
  font-size: 0.94rem;
}

tbody tr:hover {
  background: #f8fbfa;
}

.content-section {
  margin-top: 22px;
}

.split-heading {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: start;
}

.text-link {
  margin-top: 4px;
  font-weight: 800;
  white-space: nowrap;
}

.method-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, 0.42fr);
  gap: 24px;
}

.steps {
  display: grid;
  gap: 10px;
  margin: 16px 0 0;
  padding-left: 22px;
  color: var(--muted);
}

.notice {
  align-self: start;
  padding: 18px;
  border-left: 4px solid var(--accent-warm);
  background: var(--warning-bg);
}

.notice p {
  margin-bottom: 0;
  color: var(--muted);
}

.site-footer {
  max-width: var(--content);
  margin: 0 auto;
  padding: 28px clamp(20px, 5vw, 72px);
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  margin-top: 14px;
}

.footer-links a {
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 750;
}

.page-main {
  padding-top: 40px;
}

.page-hero {
  padding: 26px 0 8px;
}

.prose {
  display: grid;
  gap: 18px;
  max-width: 860px;
}

.prose h2 {
  margin-top: 8px;
  font-size: 1.25rem;
}

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

.timeline {
  display: grid;
  gap: 20px;
}

.timeline article {
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
}

.timeline time {
  display: block;
  margin-bottom: 6px;
  color: var(--accent-warm);
  font-size: 0.88rem;
  font-weight: 850;
}

.timeline h2 {
  margin-bottom: 8px;
}

.tool-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 22px;
}

.tool-card {
  display: grid;
  gap: 12px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.tool-card span {
  color: var(--accent-warm);
  font-size: 0.78rem;
  font-weight: 850;
  text-transform: uppercase;
}

.tool-card h2,
.tool-card p {
  margin: 0;
}

.tool-card p,
.tool-card dd {
  color: var(--muted);
}

.tool-card dl {
  display: grid;
  gap: 8px;
  margin: 0;
}

.tool-card dl div {
  display: grid;
  grid-template-columns: 86px minmax(0, 1fr);
  gap: 10px;
}

.tool-card dt {
  color: var(--ink);
  font-weight: 850;
}

.tool-card dd {
  margin: 0;
}

@media (max-width: 900px) {
  .hero-grid,
  .tool-layout,
  .method-grid {
    grid-template-columns: 1fr;
  }

  .calculator {
    position: static;
  }
}

@media (max-width: 720px) {
  body {
    padding-top: 118px;
  }

  .fixed-header {
    display: block;
    min-height: 118px;
    padding-top: 16px;
    padding-bottom: 12px;
  }

  .top-nav {
    margin: 12px 0 0;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .split-heading {
    display: block;
  }

  table {
    min-width: 680px;
  }

  .tool-card-grid {
    grid-template-columns: 1fr;
  }
}