:root {
  color-scheme: light;
  --ink: #172026;
  --muted: #52616b;
  --line: #d8e0e6;
  --soft: #f4f8fa;
  --panel: #ffffff;
  --accent: #0f766e;
  --accent-strong: #0b5e58;
  --gold: #b7791f;
  --danger: #b42318;
  --shadow: 0 16px 38px rgba(18, 38, 63, 0.09);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #fbfcfd;
  color: var(--ink);
  line-height: 1.55;
}

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

a:hover {
  text-decoration: underline;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.94);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
}

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

.brand {
  font-weight: 800;
  color: var(--ink);
  letter-spacing: 0;
  font-size: 1.08rem;
}

.nav-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-left: auto;
  font-size: 0.93rem;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding: 30px 20px 56px;
}

.hero {
  padding: 28px 0 18px;
}

.eyebrow {
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 750;
  text-transform: uppercase;
  letter-spacing: 0;
}

h1 {
  margin: 8px 0 12px;
  font-size: clamp(2rem, 4vw, 3.6rem);
  line-height: 1.04;
  max-width: 920px;
  letter-spacing: 0;
}

h2 {
  margin: 34px 0 12px;
  font-size: 1.55rem;
  line-height: 1.2;
  letter-spacing: 0;
}

h3 {
  margin: 18px 0 8px;
  font-size: 1.05rem;
}

.lede {
  max-width: 780px;
  color: var(--muted);
  font-size: 1.08rem;
}

.tool-shell {
  display: grid;
  grid-template-columns: minmax(280px, 390px) 1fr;
  gap: 18px;
  align-items: start;
  margin-top: 22px;
}

.panel,
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.panel {
  padding: 18px;
}

.calculator-form {
  display: grid;
  gap: 14px;
}

.field {
  display: grid;
  gap: 6px;
}

label {
  color: #25323a;
  font-size: 0.9rem;
  font-weight: 700;
}

input,
select {
  width: 100%;
  border: 1px solid #cbd6dd;
  border-radius: 7px;
  padding: 10px 11px;
  color: var(--ink);
  background: #fff;
  font: inherit;
}

.check-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.check {
  border: 1px solid var(--line);
  border-radius: 7px;
  padding: 9px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 650;
}

.check input {
  width: auto;
}

.button-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

button,
.button {
  border: 1px solid var(--accent);
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  padding: 10px 12px;
  font: inherit;
  font-weight: 760;
  cursor: pointer;
}

button.secondary,
.button.secondary {
  background: #fff;
  color: var(--accent-strong);
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-bottom: 14px;
}

.metric {
  border: 1px solid var(--line);
  background: var(--soft);
  border-radius: 8px;
  padding: 14px;
}

.metric span {
  color: var(--muted);
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
}

.metric strong {
  display: block;
  margin-top: 4px;
  font-size: 1.35rem;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

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

th,
td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  font-size: 0.92rem;
}

th {
  background: #edf5f4;
  color: #24363b;
  white-space: nowrap;
}

tr:last-child td {
  border-bottom: 0;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  border-radius: 999px;
  padding: 3px 8px;
  background: #e8f5f3;
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 750;
}

.tag.warn {
  background: #fff7e6;
  color: var(--gold);
}

.tag.bad {
  background: #fff0ee;
  color: var(--danger);
}

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

.card {
  padding: 16px;
  box-shadow: none;
}

.card p {
  color: var(--muted);
  margin: 6px 0 0;
}

.link-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px 18px;
  padding-left: 0;
  list-style: none;
}

.source-list {
  padding-left: 18px;
}

.footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  padding: 24px 20px;
  text-align: center;
}

.notice {
  border-left: 4px solid var(--gold);
  background: #fffaf0;
  padding: 12px 14px;
  border-radius: 0 8px 8px 0;
  color: #5f430f;
}

@media (max-width: 900px) {
  .tool-shell,
  .summary-grid,
  .grid,
  .link-list {
    grid-template-columns: 1fr;
  }

  .nav {
    align-items: flex-start;
    flex-direction: column;
    gap: 10px;
  }

  .nav-links {
    margin-left: 0;
  }
}

@media (max-width: 560px) {
  .wrap {
    padding: 22px 14px 42px;
  }

  .check-row {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2rem;
  }
}