/* =====================================================
   渡辺工務店｜INCIPIT DEMO 共通スタイル
   建築家アトリエ系：チャコール + ディープスレート
   数字フォント：Manrope（幾何学サンセリフ）
   ===================================================== */

:root {
  --accent: #2d3a4a;
  --accent-dark: #1a2330;
  --accent-soft: #4a5a70;
  --text: #1a1a1a;
  --text-muted: #5a5a5a;
  --line: #d4d4d4;
  --line-soft: #e8e8e8;
  --bg: #ffffff;
  --bg-paper: #fafaf8;
  --bg-soft: #f3f3f1;
  --font-display: 'Manrope', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Noto Sans JP', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.85;
  font-size: 15px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; height: auto; }

/* ===== Header（全ページ共通）===== */
header.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--line-soft);
}
.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  padding: 18px 40px;
  gap: 40px;
  max-width: 1440px;
  margin: 0 auto;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-mark {
  width: 38px;
  height: 38px;
  background: var(--accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Manrope', sans-serif;
  font-size: 18px;
  font-weight: 600;
  letter-spacing: 0.02em;
}
.brand-name {
  font-family: 'Noto Serif JP', serif;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.12em;
  line-height: 1.2;
}
.brand-name small {
  display: block;
  font-family: 'Manrope', sans-serif;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--accent);
  margin-top: 3px;
}
nav.main-nav {
  display: flex;
  gap: 30px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  justify-self: end;
}
nav.main-nav a {
  position: relative;
  padding: 6px 0;
  transition: color 0.2s;
}
nav.main-nav a:hover,
nav.main-nav a.active {
  color: var(--accent);
}
nav.main-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--accent);
}
.header-tel {
  font-family: 'Manrope', sans-serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--accent);
}
.header-tel small {
  font-family: 'Noto Sans JP', sans-serif;
  display: block;
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 2px;
  font-weight: 500;
}

/* ===== Common section ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 40px;
}
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  font-family: 'Manrope', sans-serif;
  font-size: 12px;
  letter-spacing: 0.4em;
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 30px;
  text-transform: uppercase;
}
.section-tag::before {
  content: '';
  width: 40px;
  height: 1px;
  background: var(--accent);
}
h1.page-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.03em;
}
h2.section-title {
  font-family: 'Noto Serif JP', serif;
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 50px;
  letter-spacing: 0.03em;
}
h2.section-title em { font-style: normal; color: var(--accent); }
h3.subsection-title {
  font-family: 'Noto Serif JP', serif;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 18px;
  line-height: 1.5;
}
p.lead {
  font-size: 17px;
  line-height: 2.1;
  color: var(--text);
}

/* ===== Page header（サブページ用）===== */
.page-header {
  padding: 100px 0 80px;
  background: var(--bg-paper);
  border-bottom: 1px solid var(--line-soft);
}
.page-header .breadcrumb {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-muted);
  margin-bottom: 30px;
  font-weight: 500;
}
.page-header .breadcrumb a:hover { color: var(--accent); }
.page-header .breadcrumb span { color: var(--accent); }
.page-header .page-sub {
  margin-top: 24px;
  font-size: 16px;
  color: var(--text-muted);
  line-height: 2;
  max-width: 720px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 28px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}
.btn:hover { background: var(--accent-dark); color: #fff; }
.btn.outline {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}
.btn.outline:hover {
  background: var(--accent);
  color: #fff;
}
.btn-arrow::after {
  content: '→';
  font-family: serif;
  font-size: 16px;
}

/* ===== Footer ===== */
footer.site-footer {
  background: var(--accent-dark);
  color: #b8c2cf;
  padding: 80px 40px 40px;
  margin-top: 80px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 60px;
  margin-bottom: 60px;
}
.footer-brand .brand-mark { background: #fff; color: var(--accent-dark); }
.footer-brand .brand-name { color: #fff; }
.footer-brand .brand-name small { color: rgba(255,255,255,0.6); }
.footer-brand p {
  margin-top: 20px;
  font-size: 13px;
  line-height: 1.95;
  color: #b8c2cf;
}
.footer-col h4 {
  font-family: 'Manrope', sans-serif;
  font-size: 12px;
  letter-spacing: 0.3em;
  color: #fff;
  margin-bottom: 18px;
  font-weight: 700;
  padding-bottom: 8px;
  border-bottom: 1px solid rgba(255,255,255,0.2);
}
.footer-col ul {
  list-style: none;
}
.footer-col li {
  padding: 6px 0;
  font-size: 13px;
}
.footer-col a:hover { color: #fff; }
.footer-info {
  font-size: 13px;
  line-height: 1.95;
}
.footer-info .label {
  font-family: 'Manrope', sans-serif;
  font-size: 10px;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.6);
  margin-bottom: 4px;
  display: block;
  margin-top: 14px;
}
.footer-info .label:first-child { margin-top: 0; }
.footer-bottom {
  max-width: 1200px;
  margin: 0 auto;
  padding-top: 30px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-family: 'Manrope', sans-serif;
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.5);
}

/* ===== CTA block：内部の文字を白に固定 ===== */
.cta-block {
  background: var(--accent);
  color: #fff;
  padding: 100px 40px;
  text-align: center;
}
.cta-block,
.cta-block h2,
.cta-block h2.section-title,
.cta-block h2 em,
.cta-block p {
  color: #fff;
}
.cta-block .section-tag {
  color: rgba(255,255,255,0.7);
  justify-content: center;
}
.cta-block .section-tag::before {
  background: rgba(255,255,255,0.5);
}
.cta-block p {
  color: rgba(255,255,255,0.85);
  max-width: 600px;
  margin: 0 auto 40px;
  line-height: 2;
}
.cta-block .btn {
  background: #fff;
  color: var(--accent);
}
.cta-block .btn:hover {
  background: rgba(255,255,255,0.85);
  color: var(--accent);
}

/* ===== Card grid ===== */
.card-grid {
  display: grid;
  gap: 30px;
}
.card-grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card-grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.card-grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .header-inner {
    grid-template-columns: 1fr auto;
    padding: 14px 24px;
    gap: 20px;
  }
  nav.main-nav { display: none; }
  .container { padding: 0 24px; }
  .page-header { padding: 60px 0 50px; }
  .footer-inner { grid-template-columns: 1fr; gap: 40px; }
  .card-grid.cols-2,
  .card-grid.cols-3,
  .card-grid.cols-4 { grid-template-columns: 1fr; }
}