:root {
  --bg: #f3f7fa;
  --surface: #ffffff;
  --surface-2: #eaf5f6;
  --ink: #17202a;
  --muted: #5d6978;
  --line: #d9e1ea;
  --accent: #0d6b72;
  --accent-2: #24539b;
  --accent-soft: #dff2ef;
  --warn: #9f6b12;
  --good: #21764b;
  --shadow: 0 14px 32px rgba(23, 32, 42, .08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, system-ui, sans-serif;
  line-height: 1.75;
}
a { color: var(--accent-2); text-decoration-thickness: .08em; text-underline-offset: .18em; }
.site-header {
  background: #fff;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav {
  max-width: 1120px;
  margin: 0 auto;
  min-height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  gap: 18px;
}
.brand { color: var(--ink); font-weight: 800; text-decoration: none; letter-spacing: .02em; }
.nav-links { display: flex; gap: 18px; align-items: center; font-size: 14px; }
.nav-links a { color: var(--muted); text-decoration: none; }
.nav-links a:hover { color: var(--ink); }
.hero {
  background:
    radial-gradient(circle at 78% 18%, rgba(13, 107, 114, .13), transparent 34%),
    linear-gradient(135deg, #ffffff 0%, #edf7f7 52%, #edf3fb 100%);
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 54px 24px 50px;
  display: grid;
  grid-template-columns: minmax(0, .95fr) minmax(360px, .8fr);
  gap: 34px;
  align-items: center;
}
.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 800;
}
h1, h2, h3 { line-height: 1.35; }
h1 { margin: 0 0 16px; font-size: clamp(30px, 5vw, 52px); letter-spacing: 0; }
.hero-title {
  max-width: 720px;
  font-size: clamp(34px, 3.8vw, 48px);
  line-height: 1.25;
  letter-spacing: .02em;
  word-break: keep-all;
  overflow-wrap: normal;
}
.hero-title-main {
  white-space: nowrap;
  word-break: keep-all;
  overflow-wrap: normal;
}
.hero-title-break { display: block; }
h2 { margin: 0 0 18px; font-size: 25px; }
h3 { margin: 0 0 8px; font-size: 18px; }
.lead { margin: 0 0 24px; color: var(--muted); font-size: 17px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.button {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  text-decoration: none;
  font-weight: 800;
}
.button.secondary { background: #fff; color: var(--accent); }
.button.small { min-height: 50px; padding: 13px 20px; font-size: 14px; }
.summary-card, .tool-card, .card, .cta-card, .simple-calc {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.simple-calc { padding: 22px; }
.simple-calc h2 { margin-bottom: 6px; }
.simple-calc .subtext { margin: 0 0 16px; color: var(--muted); font-size: 14px; }
.simple-result {
  margin: 18px 0;
  padding: 18px;
  border-radius: 8px;
  background: linear-gradient(135deg, #e6f6f3, #edf3fb);
  border: 1px solid #c2ddd9;
}
.simple-result span { display: block; color: var(--muted); font-size: 12px; font-weight: 800; }
.simple-result strong { display: block; font-size: clamp(30px, 4vw, 42px); line-height: 1.2; color: var(--accent); }
.simple-metrics { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.simple-metrics div { padding: 10px; border-radius: 8px; background: #fff; border: 1px solid var(--line); }
.simple-metrics b { display: block; font-size: 16px; }
.calc-note { margin: 10px 0 0; color: var(--muted); font-size: 13px; }
.summary-card { padding: 24px; }
.stats { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.stat { padding: 14px; background: var(--surface-2); border-radius: 8px; }
.stat span { display: block; color: var(--muted); font-size: 12px; font-weight: 700; }
.stat strong { display: block; font-size: 24px; }
.main {
  max-width: 1120px;
  margin: 0 auto;
  padding: 34px 24px 56px;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 13px;
}
.breadcrumb a { color: var(--accent); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.meta-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 24px;
  padding: 12px 14px;
  border: 1px solid #c7dee1;
  border-radius: 8px;
  background: #f2fbfa;
  color: var(--muted);
  font-size: 13px;
}
.meta-strip b { color: var(--ink); }
.section { margin: 0 0 36px; }
.section.narrow { max-width: 860px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { padding: 20px; box-shadow: none; }
.tool-layout { display: grid; grid-template-columns: minmax(320px, .92fr) minmax(0, 1.08fr); gap: 20px; align-items: start; }
.tool-card { padding: 22px; }
.field { margin: 0 0 18px; }
.field label { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 8px; font-weight: 800; }
input[type="range"] { width: 100%; accent-color: var(--accent); }
select, input[type="number"] {
  width: 100%;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 8px 10px;
  font: inherit;
}
.result-panel { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 8px; }
.result-main { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 18px; }
.metric { padding: 16px; border-radius: 8px; background: #eef6f7; }
.metric span { display: block; color: var(--muted); font-size: 13px; font-weight: 800; }
.metric strong { display: block; font-size: clamp(24px, 4vw, 36px); line-height: 1.25; }
.breakdown { width: 100%; border-collapse: collapse; background: #fff; }
.breakdown th, .breakdown td { border-bottom: 1px solid var(--line); padding: 10px 8px; text-align: left; }
.breakdown td:last-child, .breakdown th:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.source-table { width: 100%; border-collapse: collapse; background: #fff; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.source-table th, .source-table td { border-bottom: 1px solid var(--line); padding: 12px; text-align: left; vertical-align: top; }
.source-table th { background: var(--surface-2); }
.notice { border-left: 4px solid var(--warn); background: #fff8e8; padding: 14px 16px; border-radius: 8px; color: #4f3a14; }
.answer { background: #e9f6f3; border: 1px solid #b9dad2; padding: 18px; border-radius: 8px; }
.answer strong { font-size: 24px; }
.section:has(.cta-grid) {
  margin-bottom: 30px;
  padding: 18px;
  border-radius: 8px;
  background: #edf8f5;
  border: 1px solid #cfe5df;
}
.cta-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.cta-grid-single { grid-template-columns: minmax(0, 680px); }
.inline-cta {
  margin-top: 14px;
  padding: 14px;
  border-radius: 8px;
  border: 1px solid #cfe5df;
  background: #edf8f5;
}
.inline-cta h2 { font-size: 18px; margin-bottom: 10px; }
.cta-card {
  padding: 20px;
  box-shadow: 0 12px 26px rgba(23, 32, 42, .08);
  border: 1px solid #c8dde0;
  border-top: 9px solid var(--accent);
  background: #fff;
}
.cta-card h3 { margin-bottom: 8px; font-size: 19px; }
.cta-card p { color: var(--muted); margin: 0 0 10px; }
.cta-card .button {
  margin-top: 4px;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.cta-card .button:hover { filter: brightness(.96); }
.pill-list { display: flex; flex-wrap: wrap; gap: 10px; padding: 0; margin: 0; list-style: none; }
.pill-list a { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; padding: 6px 12px; background: #fff; text-decoration: none; }
.related-links {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface-2);
}
.related-links h2 { margin-bottom: 12px; font-size: 20px; }
.wall-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.wall-card {
  display: block;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  text-decoration: none;
  color: var(--ink);
}
.wall-card strong { display: block; font-size: 24px; color: var(--accent); }
.wall-card span { color: var(--muted); font-size: 13px; }
.footer { background: #14212b; color: #d9e1ea; }
.footer-inner { max-width: 1120px; margin: 0 auto; padding: 28px 24px; font-size: 13px; }
.footer a { color: #fff; }
@media (max-width: 820px) {
  html, body { max-width: 100%; overflow-x: hidden; }
  .hero-inner, .tool-layout { grid-template-columns: 1fr; }
  .grid, .cta-grid, .wall-grid { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; padding: 14px 20px; }
  .nav-links { flex-wrap: wrap; }
  .nav-links a:nth-child(n+4) { display: none; }
  .result-main, .stats { grid-template-columns: 1fr; }
  .hero-inner { padding-top: 34px; }
  .hero-title { font-size: clamp(27px, 7.2vw, 32px); line-height: 1.3; }
  .simple-metrics { grid-template-columns: 1fr; }
  .simple-calc .button { width: 100%; }
  .section:has(.cta-grid) { padding: 16px; }
  .cta-grid { gap: 18px; }
  .inline-cta { padding: 16px; }
  .cta-card .button { width: 100%; }
}
@media (max-width: 640px) {
  .hero-title { font-size: clamp(24px, 7.5vw, 30px); }
}