:root {
  --ink: #17221f;
  --muted: #51645e;
  --line: #d6e4df;
  --paper: #ffffff;
  --wash: #f5faf8;
  --accent: #1a8c78;
  --accent-dark: #116b5c;
  --warn: #9a5b00;
  --soft: #e9f6f2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--wash);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.75;
}

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

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.header-inner,
.footer-inner,
main {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 18px;
  padding: 14px 0;
}

.brand {
  font-weight: 800;
  color: var(--ink);
  text-decoration: none;
  font-size: 1.18rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

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

.site-nav a {
  padding: 6px 9px;
  border-radius: 6px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--soft);
  color: var(--accent-dark);
}

main {
  padding: 28px 0 48px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(220px, .8fr);
  gap: 28px;
  align-items: center;
  padding: 10px 0 24px;
}

.hero h1,
.page-title h1 {
  font-size: clamp(1.8rem, 5vw, 3rem);
  line-height: 1.18;
  margin: 0 0 14px;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 20px;
}

.hero-visual {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

.tool-grid,
.cards,
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
}

.card,
.panel,
.notice,
.result-box,
#offer-slot {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.card {
  display: block;
  padding: 16px;
  color: var(--ink);
  text-decoration: none;
}

.card h2,
.card h3,
.panel h2,
.panel h3 {
  margin: 0 0 8px;
  line-height: 1.35;
}

.card p,
.panel p {
  margin: 0;
  color: var(--muted);
}

.button-link {
  display: inline-block;
  margin-top: 14px;
  padding: 11px 16px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  text-decoration: none;
}

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

.calculator {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, .8fr);
  gap: 18px;
  align-items: start;
}

.panel {
  padding: 18px;
}

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

label {
  display: grid;
  gap: 6px;
  font-weight: 700;
}

input,
select {
  width: 100%;
  padding: 11px 12px;
  color: var(--ink);
  border: 1px solid #b9cbc5;
  border-radius: 6px;
  background: #fff;
  font: inherit;
}

input:focus,
select:focus {
  outline: 3px solid #cfeee7;
  border-color: var(--accent);
}

.hint,
.error {
  font-size: .88rem;
}

.hint {
  color: var(--muted);
}

.error {
  color: #a13121;
  min-height: 1.4em;
}

.result-list {
  display: grid;
  gap: 10px;
  margin: 14px 0;
}

.result-box {
  padding: 12px;
}

.result-box span {
  display: block;
  color: var(--muted);
  font-size: .9rem;
}

.result-box strong {
  display: block;
  font-size: 1.7rem;
  line-height: 1.25;
}

.formula {
  padding: 12px;
  background: #f7fbfa;
  border-left: 4px solid var(--accent);
  color: var(--muted);
}

.notice {
  padding: 14px;
  color: var(--muted);
}

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

.content-section h2 {
  margin: 0 0 8px;
}

.content-section h3 {
  margin: 18px 0 6px;
}

.content-section p + p,
.content-section p + .button-link {
  margin-top: 12px;
}

.tips {
  padding-left: 1.2em;
}

.tips li {
  margin-bottom: 8px;
}

#offer-slot {
  margin-top: 14px;
  padding: 18px;
  min-height: 96px;
  color: var(--muted);
  background: #fbfdfc;
}

.affiliate-offers {
  display: grid;
  gap: 14px;
}

.offer-header,
.ad-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.offer-header h2 {
  margin: 0;
  color: var(--ink);
}

.pr-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 42px;
  padding: 2px 8px;
  border: 1px solid var(--warn);
  border-radius: 999px;
  color: var(--warn);
  background: #fff8ed;
  font-size: .78rem;
  font-weight: 800;
  line-height: 1.4;
}

.ad-banner-list {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: flex-start;
}

.ad-banner {
  max-width: 300px;
  line-height: 0;
}

.ad-banner img {
  max-width: 100%;
  height: auto;
}

.ad-box {
  margin-top: 18px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfdfc;
}

.ad-box .ad-banner {
  margin: 8px auto 0;
}

.table-wrap {
  overflow-x: auto;
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 620px;
}

caption {
  text-align: left;
  padding: 12px 14px 0;
  color: var(--muted);
  font-size: .9rem;
}

th,
td {
  padding: 10px 12px;
  border-bottom: 1px solid #e6eeeb;
  text-align: right;
  vertical-align: top;
}

th:first-child,
td:first-child {
  text-align: left;
}

thead th {
  background: #f7fbfa;
  color: var(--ink);
}

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

.related-links {
  margin-top: 22px;
}

.related-links h2 {
  margin: 0 0 10px;
}

.related-grid .card {
  padding: 14px;
}

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

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  color: var(--muted);
  font-size: .92rem;
}

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

@media (max-width: 760px) {
  .hero,
  .calculator,
  .tool-grid,
  .cards {
    grid-template-columns: 1fr;
  }

  .ad-banner-list {
    flex-direction: column;
    align-items: center;
  }

  .hero-visual {
    max-height: 220px;
    object-fit: cover;
  }

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

  .footer-inner {
    display: grid;
  }
}