:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef2f6;
  --text: #17202a;
  --muted: #5d6978;
  --border: #d8dee7;
  --primary: #1769aa;
  --primary-dark: #0f4f83;
  --green: #138a55;
  --red: #c24135;
  --amber: #b7791f;
  --ink: #0f1720;
  --shadow: 0 12px 30px rgba(19, 31, 45, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
}

body {
  margin: 0;
  min-height: 100vh;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 20px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 210px;
  color: var(--ink);
  font-weight: 760;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 17px;
}

.nav-links {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-links a {
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 14px;
}

.nav-links a:hover,
.nav-links a.active {
  background: var(--surface-2);
  color: var(--ink);
  text-decoration: none;
}

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 56px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 28px;
  align-items: stretch;
  padding: 38px 0 26px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--primary-dark);
  font-size: 13px;
  font-weight: 750;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.12;
}

h1 {
  max-width: 820px;
  font-size: 44px;
}

h2 {
  font-size: 28px;
}

h3 {
  font-size: 18px;
}

p {
  color: var(--muted);
  line-height: 1.65;
}

.hero p {
  max-width: 700px;
  font-size: 17px;
}

.hero-panel,
.tool-card,
.tool-panel,
.results-panel,
.content-block,
.legal-page {
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel {
  padding: 22px;
}

.hero-stat {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 13px 0;
  border-bottom: 1px solid var(--border);
}

.hero-stat:last-child {
  border-bottom: 0;
}

.hero-stat strong {
  font-size: 22px;
  color: var(--ink);
}

.hero-stat span {
  color: var(--muted);
  font-size: 13px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.tool-card {
  min-height: 174px;
  padding: 18px;
  transition: transform 160ms ease, border-color 160ms ease;
}

.tool-card:hover {
  border-color: #9bb8d6;
  transform: translateY(-2px);
  text-decoration: none;
}

.tool-card p {
  margin: 10px 0 0;
  font-size: 14px;
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: #fbfcfd;
  font-size: 12px;
  font-weight: 650;
}

.tool-hero {
  padding: 28px 0 22px;
}

.tool-hero h1 {
  font-size: 38px;
}

.tool-hero p {
  max-width: 780px;
}

.tool-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 390px;
  gap: 18px;
  align-items: start;
}

.tool-panel,
.results-panel {
  padding: 20px;
}

.results-panel {
  position: sticky;
  top: 80px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 7px;
}

.field.full {
  grid-column: 1 / -1;
}

label {
  color: var(--ink);
  font-size: 13px;
  font-weight: 720;
}

.help {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

input,
select {
  width: 100%;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 11px;
  font: inherit;
}

input:focus,
select:focus {
  outline: 3px solid rgba(23, 105, 170, 0.16);
  border-color: var(--primary);
}

.checkbox-field {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  min-height: 42px;
  padding: 11px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.checkbox-field input {
  width: 18px;
  height: 18px;
  margin: 1px 0 0;
  padding: 0;
}

.button-row {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 16px;
}

button,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font: inherit;
  font-weight: 720;
}

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

button:hover,
.button:hover {
  border-color: var(--primary);
  text-decoration: none;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 16px;
}

.metric {
  min-height: 92px;
  padding: 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
}

.metric strong {
  display: block;
  margin-top: 8px;
  color: var(--ink);
  font-size: 22px;
}

.metric span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
}

.metric.good strong {
  color: var(--green);
}

.metric.bad strong {
  color: var(--red);
}

.metric.warn strong {
  color: var(--amber);
}

.breakdown {
  margin-top: 18px;
}

.breakdown-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  align-items: center;
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

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

.breakdown-row strong {
  color: var(--ink);
}

.bar-track {
  width: 100%;
  height: 9px;
  margin-top: 7px;
  border-radius: 999px;
  background: #e4e9f0;
  overflow: hidden;
}

.bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--primary);
}

.bar-fill.cost {
  background: var(--amber);
}

.bar-fill.profit {
  background: var(--green);
}

.notes {
  margin: 16px 0 0;
  padding: 12px 14px;
  border-left: 4px solid var(--primary);
  background: #eef6fc;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.55;
}

.content-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 18px;
  margin-top: 24px;
}

.content-block,
.legal-page {
  padding: 22px;
}

.content-block + .content-block {
  margin-top: 18px;
}

.content-block ul,
.legal-page ul {
  color: var(--muted);
  line-height: 1.7;
  padding-left: 20px;
}

.related-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
}

.related-list a {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fbfcfd;
  color: var(--ink);
}

.related-list a:hover {
  border-color: var(--primary);
  text-decoration: none;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: #fff;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 22px 20px;
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.formula {
  overflow-x: auto;
  padding: 12px;
  border-radius: 8px;
  background: #111827;
  color: #f8fafc;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 13px;
}

@media (max-width: 980px) {
  .hero,
  .tool-layout,
  .content-grid {
    grid-template-columns: 1fr;
  }

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

  .results-panel {
    position: static;
  }
}

@media (max-width: 640px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  h1,
  .tool-hero h1 {
    font-size: 32px;
  }

  .tool-grid,
  .form-grid,
  .metric-grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }
}