:root {
  color-scheme: light;
  --bg: #f7f5ef;
  --surface: #ffffff;
  --surface-alt: #ebe7dc;
  --text: #20231f;
  --muted: #626a5e;
  --line: #d8d2c4;
  --accent: #2f6b4f;
  --accent-strong: #204b37;
  --accent-soft: #dce9dd;
  --warning: #815b16;
  --radius: 8px;
  --shadow: 0 10px 28px rgba(32, 35, 31, 0.08);
  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: 1.55;
}

a {
  color: var(--accent-strong);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.16em;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(247, 245, 239, 0.94);
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(14px);
}

.nav {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  text-decoration: none;
}

.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  color: #fff;
  background: var(--accent);
  border-radius: 8px;
  font-weight: 900;
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  font-size: 0.95rem;
}

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

.hero {
  padding: 48px 0 28px;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: 32px;
  align-items: start;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-strong);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0;
  font-size: 0.78rem;
}

h1,
h2,
h3 {
  line-height: 1.12;
  letter-spacing: 0;
}

h1 {
  margin: 0;
  font-size: clamp(2.15rem, 4vw, 4.6rem);
  max-width: 820px;
}

h2 {
  margin: 0 0 16px;
  font-size: clamp(1.45rem, 2.5vw, 2.4rem);
}

h3 {
  margin: 0 0 8px;
  font-size: 1.05rem;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.12rem;
  margin: 18px 0 0;
}

.hero-card,
.calculator-panel,
.result-panel,
.note,
.link-card,
.content-box {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 22px;
}

.hero-card ul {
  margin: 12px 0 0;
  padding-left: 20px;
}

.quick-grid,
.calculator-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.section {
  padding: 34px 0;
}

.link-card {
  display: block;
  min-height: 138px;
  padding: 18px;
  color: var(--text);
  text-decoration: none;
  transition: transform 160ms ease, border-color 160ms ease;
}

.link-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.link-card p {
  color: var(--muted);
  margin: 8px 0 0;
}

.pill {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 800;
  padding: 4px 9px;
  margin-bottom: 12px;
}

.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 360px);
  gap: 22px;
  align-items: start;
}

.calculator-panel,
.result-panel,
.content-box {
  padding: 20px;
}

.field-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

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

.mode-option {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  padding: 12px;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 9px;
  align-items: start;
  cursor: pointer;
}

.mode-option input {
  width: auto;
  margin-top: 3px;
}

.mode-option strong,
.mode-option span {
  display: block;
}

.mode-option span {
  color: var(--muted);
  font-size: 0.88rem;
}

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

label {
  color: var(--text);
  font-weight: 750;
  font-size: 0.9rem;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 12px 11px;
  font: inherit;
  background: #fff;
  color: var(--text);
}

input:focus,
select:focus,
textarea:focus {
  outline: 3px solid rgba(47, 107, 79, 0.18);
  border-color: var(--accent);
}

.result-value {
  font-size: 2.2rem;
  line-height: 1;
  font-weight: 850;
  margin: 4px 0 8px;
}

.result-list {
  display: grid;
  gap: 10px;
  margin-top: 18px;
}

.result-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.result-row span:first-child {
  color: var(--muted);
}

.note {
  padding: 14px;
  color: var(--muted);
  box-shadow: none;
  background: #fffaf0;
  border-color: #dfc98b;
}

.comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 16px;
}

.comparison-box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--surface);
}

.comparison-box ul {
  margin: 10px 0 0;
  padding-left: 20px;
  color: var(--muted);
}

.copy {
  max-width: 760px;
}

.copy p,
.copy li {
  color: var(--muted);
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 42px;
  padding: 26px 0;
  color: var(--muted);
}

.footer-inner {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

@media (max-width: 820px) {
  .hero-grid,
  .calculator-layout {
    grid-template-columns: 1fr;
  }

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

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

  .mode-grid,
  .comparison-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 12px 0;
    gap: 8px;
  }

  .nav-links {
    width: 100%;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .quick-grid,
  .calculator-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 30px;
  }
}