:root {
  --ink: #17202a;
  --ink-2: #263444;
  --paper: #f7f3ec;
  --paper-2: #eee8df;
  --white: #fffdf9;
  --accent: #c94d2b;
  --accent-dark: #9e351b;
  --line: rgba(23, 32, 42, .16);
  --muted: #625f5a;
  --max: 1180px;
  --serif: "Noto Serif JP", "Yu Mincho", serif;
  --sans: "Noto Sans JP", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.85;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; }
button, input, textarea, select { font: inherit; }
.container { width: min(var(--max), calc(100% - 48px)); margin-inline: auto; }
.skip { position: fixed; left: 12px; top: -80px; z-index: 100; background: var(--ink); color: #fff; padding: 10px 16px; }
.skip:focus { top: 12px; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 78px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 13px; text-decoration: none; }
.brand-logo { width: 42px; height: 34px; object-fit: contain; flex: 0 0 auto; }
.brand-copy { display: flex; flex-direction: column; }
.brand-copy small { order: -1; color: var(--muted); font-size: 10px; font-weight: 600; line-height: 1.35; letter-spacing: .08em; }
.brand-copy strong { font-size: 19px; line-height: 1.35; font-weight: 800; letter-spacing: .025em; white-space: nowrap; }
.nav-links { display: flex; align-items: center; gap: 28px; font-size: 14px; font-weight: 600; }
.nav-links a { text-decoration: none; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--accent); }
.nav-cta { border: 1px solid var(--ink); padding: 10px 17px; }
.nav-toggle { display: none; border: 0; background: transparent; width: 44px; height: 44px; font-size: 24px; cursor: pointer; }

.hero { position: relative; overflow: hidden; padding: 68px 0 64px; border-bottom: 1px solid var(--line); }
.hero::after {
  content: "";
  position: absolute;
  width: 620px;
  height: 620px;
  right: -180px;
  top: -250px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: repeating-conic-gradient(from 20deg, transparent 0 14deg, rgba(201,77,43,.09) 14deg 15deg);
  pointer-events: none;
}
.hero-grid { position: relative; z-index: 1; }
.hero-copy { max-width: 880px; padding: 18px 0 30px; }
.kicker { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .19em; text-transform: uppercase; }
.hero h1, .page-hero h1 { margin: 18px 0 24px; font-family: var(--serif); font-weight: 500; letter-spacing: .02em; line-height: 1.42; }
.hero h1 { font-size: clamp(2.5rem, 4.2vw, 3.8rem); letter-spacing: .01em; }
.hero h1 em { color: var(--accent); font-style: normal; }
.hero-lead { max-width: 650px; color: var(--ink-2); font-size: 18px; line-height: 2; }
.actions { display: flex; align-items: center; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
.btn { display: inline-flex; min-height: 54px; align-items: center; justify-content: center; padding: 0 26px; border: 1px solid var(--ink); text-decoration: none; font-weight: 700; letter-spacing: .04em; transition: .2s ease; }
.btn.primary { background: var(--ink); color: white; }
.btn:hover { transform: translateY(-2px); border-color: var(--accent); }
.btn.primary:hover { background: var(--accent); }

.proof-strip { background: var(--ink); color: #fff; }
.proof-grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.proof { padding: 24px 22px; border-right: 1px solid rgba(255,255,255,.16); }
.proof:last-child { border-right: 0; }
.proof strong { display: block; font-family: var(--serif); font-size: 22px; color: #f6b09c; }
.proof span { color: rgba(255,255,255,.72); font-size: 13px; }

.section { padding: 104px 0; }
.section.compact { padding: 72px 0; }
.section.white { background: var(--white); }
.section.dark { background: var(--ink); color: #fff; }
.section-head { display: grid; grid-template-columns: 240px 1fr; gap: 38px; margin-bottom: 48px; }
.section-head h2 { margin: 0; font-family: var(--serif); font-size: clamp(2rem, 4vw, 3.4rem); font-weight: 500; line-height: 1.48; }
.section-head p { margin: 8px 0 0; color: var(--muted); max-width: 720px; }
.dark .section-head p { color: rgba(255,255,255,.68); }

.issue-grid, .service-grid, .case-grid, .article-grid { display: grid; gap: 18px; }
.issue-grid { grid-template-columns: repeat(3, 1fr); }
.issue { min-height: 230px; padding: 30px; border: 1px solid var(--line); background: rgba(255,255,255,.4); }
.issue .num { font-family: var(--serif); color: var(--accent); font-size: 28px; }
.issue h3 { margin: 28px 0 10px; font-size: 19px; }
.issue p { margin: 0; color: var(--muted); font-size: 14px; }
.service-grid { grid-template-columns: repeat(2, 1fr); }
.service-card { padding: 38px; background: var(--white); border-top: 4px solid var(--accent); }
.service-card .tag { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .13em; }
.service-card h3 { margin: 12px 0; font-family: var(--serif); font-size: 25px; }
.service-card p { color: var(--muted); }
.check-list { list-style: none; padding: 0; margin: 20px 0 0; }
.check-list li { position: relative; padding: 9px 0 9px 26px; border-bottom: 1px solid var(--line); }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--accent); font-weight: 800; }

.steps { counter-reset: step; }
.step { display: grid; grid-template-columns: 90px 1fr; gap: 26px; padding: 30px 0; border-top: 1px solid rgba(255,255,255,.2); }
.step::before { counter-increment: step; content: "0" counter(step); font-family: var(--serif); color: #f6b09c; font-size: 34px; }
.step h3 { margin: 0 0 8px; font-size: 20px; }
.step p { margin: 0; color: rgba(255,255,255,.7); }

.case-grid { grid-template-columns: repeat(3, 1fr); }
.case-card { background: var(--white); border: 1px solid var(--line); }
.case-card img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.case-body { padding: 25px; }
.case-body .meta { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .1em; }
.case-body h3 { margin: 10px 0; font-family: var(--serif); font-size: 20px; }
.case-body p { margin: 0; color: var(--muted); font-size: 14px; }

.article-grid { grid-template-columns: repeat(3, 1fr); }
.article-card { display: block; padding: 28px; background: var(--white); border: 1px solid var(--line); text-decoration: none; }
.article-card:hover { border-color: var(--accent); }
.article-card time { color: var(--muted); font-size: 13px; }
.article-card h3 { margin: 13px 0; font-family: var(--serif); font-size: 20px; line-height: 1.65; }
.article-card span { color: var(--accent); font-weight: 700; font-size: 13px; }
.article-card p { margin: 0 0 18px; color: var(--muted); font-size: 14px; }
.article-card b { color: var(--accent); font-size: 13px; }
.article-card .article-category { display: inline-block; margin: 0 0 0 10px; }

.cta { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 30px; padding: 48px; background: var(--accent); color: white; }
.cta h2 { margin: 0; font-family: var(--serif); font-size: clamp(1.8rem, 4vw, 3rem); font-weight: 500; }
.cta p { margin: 8px 0 0; color: rgba(255,255,255,.82); }
.cta .btn { color: white; border-color: white; }

.page-hero { padding: 88px 0 70px; border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.4rem, 5vw, 4.4rem); }
.page-hero p { max-width: 720px; color: var(--muted); font-size: 17px; }
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: start; }
.price { display: flex; align-items: baseline; gap: 10px; margin: 18px 0; }
.price strong { font-family: var(--serif); color: var(--accent); font-size: 42px; }
.note { padding: 22px; background: var(--paper-2); border-left: 3px solid var(--accent); color: var(--muted); font-size: 14px; }

.article { width: min(820px, calc(100% - 48px)); margin: 0 auto; padding: 72px 0 110px; }
.article h1 { font-family: var(--serif); font-size: clamp(2rem, 5vw, 3.5rem); line-height: 1.5; }
.article h2 { margin-top: 52px; padding-bottom: 10px; border-bottom: 2px solid var(--accent); font-family: var(--serif); font-size: 27px; }
.article h3 { margin-top: 34px; font-size: 20px; }
.article p, .article li { color: #3f4347; }
.article .leadbox { margin: 30px 0; padding: 28px; background: var(--white); border: 1px solid var(--line); }
.seo-article { width: min(900px, calc(100% - 48px)); }
.seo-article > section { scroll-margin-top: 100px; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 34px; color: var(--muted); font-size: 13px; }
.breadcrumbs a { color: var(--muted); }
.article-meta { display: flex; flex-wrap: wrap; gap: 10px 24px; margin: 16px 0 30px; color: var(--muted); font-size: 14px; }
.article-meta a { color: var(--accent-dark); font-weight: 700; }
.answer-box { margin: 32px 0 52px; padding: 28px 30px; background: var(--ink); color: #fff; border-left: 5px solid var(--accent); }
.answer-box strong { display: block; margin-bottom: 8px; color: #f6b09c; font-size: 14px; letter-spacing: .09em; }
.answer-box p { margin: 0; color: #fff; font-size: 17px; line-height: 1.9; }
.seo-article h2 { margin-top: 58px; }
.seo-article h3 { margin: 30px 0 10px; font-size: 20px; }
.seo-article li + li { margin-top: 8px; }
.table-wrap { margin: 26px 0; overflow-x: auto; border: 1px solid var(--line); background: var(--white); }
.table-wrap table { width: 100%; min-width: 620px; border-collapse: collapse; }
.table-wrap th, .table-wrap td { padding: 15px 16px; border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); text-align: left; vertical-align: top; }
.table-wrap th { background: var(--ink); color: #fff; font-size: 14px; }
.table-wrap tr:last-child td { border-bottom: 0; }
.article-faq .faq-list { margin-top: 22px; }
.article-faq .faq-list > div { padding: 24px 0; border-top: 1px solid var(--line); }
.article-faq .faq-list dt { font-weight: 800; }
.article-faq .faq-list dt span { display: inline-grid; width: 30px; height: 30px; margin-right: 10px; place-items: center; background: var(--accent); color: #fff; }
.article-faq .faq-list dd { margin: 12px 0 0 40px; color: var(--muted); }
.author-card { display: grid; grid-template-columns: 1fr auto; gap: 28px; align-items: end; margin: 58px 0 0; padding: 30px; border: 1px solid var(--line); background: var(--white); }
.author-card span { color: var(--accent); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
.author-card h2 { margin: 7px 0 10px; padding: 0; border: 0; font-size: 25px; }
.author-card p { margin: 0; font-size: 14px; }
.author-card > a { color: var(--accent-dark); font-size: 14px; font-weight: 700; white-space: nowrap; }
.related-articles > div { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.related-articles a { display: flex; min-height: 170px; padding: 22px; flex-direction: column; gap: 12px; border: 1px solid var(--line); background: var(--white); text-decoration: none; }
.related-articles a:hover { border-color: var(--accent); }
.related-articles a span { color: var(--accent); font-size: 12px; font-weight: 800; }
.related-articles a strong { line-height: 1.6; }
.blog-index { display: grid; gap: 88px; }
.blog-category .section-head { margin-bottom: 30px; }
.blog-category .article-grid { align-items: stretch; }

.form { padding: 34px; background: var(--white); border: 1px solid var(--line); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.field { display: flex; flex-direction: column; gap: 7px; font-weight: 600; font-size: 14px; }
.field.full { grid-column: 1 / -1; }
.field input, .field textarea, .field select { width: 100%; border: 1px solid var(--line); background: #fff; padding: 13px 14px; color: var(--ink); }
.field textarea { min-height: 170px; resize: vertical; }
.form-status { margin: 18px 0 0; font-weight: 700; }
.form button { margin-top: 24px; cursor: pointer; }

.site-footer { padding: 56px 0 28px; background: #101820; color: white; }
.footer-grid { display: grid; grid-template-columns: 1.1fr 2fr; gap: 60px; }
.footer-links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.footer-links a { display: block; margin: 7px 0; color: rgba(255,255,255,.66); text-decoration: none; font-size: 14px; }
.footer-links strong { font-size: 13px; letter-spacing: .1em; }
.copyright { margin-top: 42px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.14); color: rgba(255,255,255,.45); font-size: 12px; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .nav-links { display: none; position: absolute; top: 78px; left: 0; right: 0; padding: 24px; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; align-items: stretch; }
  .nav-links.open { display: flex; }
  .split, .footer-grid { grid-template-columns: 1fr; }
  .related-articles > div { grid-template-columns: 1fr; }
  .proof-grid { grid-template-columns: repeat(2, 1fr); }
  .proof:nth-child(2) { border-right: 0; }
  .issue-grid, .case-grid, .article-grid { grid-template-columns: 1fr 1fr; }
  .section-head { grid-template-columns: 1fr; gap: 12px; }
}

@media (max-width: 620px) {
  .container { width: min(100% - 30px, var(--max)); }
  .hero, .page-hero { padding-top: 62px; }
  .hero h1 { font-size: 2.55rem; }
  .hero-lead { font-size: 16px; }
  .hero-copy { padding: 0 0 10px; }
  .section { padding: 76px 0; }
  .proof-grid, .issue-grid, .service-grid, .case-grid, .article-grid, .form-grid, .footer-links { grid-template-columns: 1fr; }
  .proof { border-right: 0; border-bottom: 1px solid rgba(255,255,255,.16); }
  .cta { grid-template-columns: 1fr; padding: 34px 24px; }
  .seo-article { width: min(100% - 30px, 900px); padding-top: 44px; }
  .answer-box { padding: 24px 22px; }
  .author-card { grid-template-columns: 1fr; align-items: start; }
  .step { grid-template-columns: 64px 1fr; }
}