:root {
  --main: #1b3a6b;
  --main-dark: #142d54;
  --accent: #2ea8e0;
  --text: #1a1f1c;
  --muted: #5c6560;
  --line: #c8d8ee;
  --bg: #fafbf9;
  --bg-secondary: #f0f2f1;
  --white: #fff;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Noto Sans JP", system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--main-dark); font-weight: 600; }
.wrap {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 1.25rem;
}
.wrap--article { max-width: 720px; }

.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--line);
  padding: 0.85rem 0;
}
.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-logo {
  font-size: 1rem;
  font-weight: 800;
  color: var(--main);
  text-decoration: none;
}
.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  font-size: 0.82rem;
}
.site-nav a { text-decoration: none; font-weight: 700; }

.page-hero {
  padding: 2.5rem 0 2rem;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--white) 0%, var(--bg) 100%);
}
.page-hero h1 {
  font-size: clamp(1.4rem, 4vw, 1.9rem);
  font-weight: 800;
  color: var(--main);
  letter-spacing: -0.02em;
  line-height: 1.35;
}
.page-hero .lead {
  margin-top: 0.65rem;
  color: var(--muted);
  font-size: 0.92rem;
  max-width: 40em;
}

.column-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  padding: 2.5rem 0 3rem;
}
@media (max-width: 900px) {
  .column-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .column-grid { grid-template-columns: 1fr; }
}

.column-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}
.column-card:hover {
  box-shadow: 0 8px 28px rgba(27, 58, 107, 0.1);
  border-color: rgba(46, 168, 224, 0.45);
}
.column-card-thumb {
  height: 140px;
  background: center/cover no-repeat;
  background-color: #e8eef5;
}
.column-card-body {
  padding: 1.1rem 1.15rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.column-card-meta {
  font-size: 0.72rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}
.column-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: #eef3fa;
  color: var(--main);
  margin-right: 0.35rem;
  margin-bottom: 0.35rem;
}
.column-card h2 {
  font-size: 0.98rem;
  font-weight: 800;
  color: var(--main);
  line-height: 1.45;
  margin-bottom: 0.5rem;
}
.column-card h2 a {
  color: inherit;
  text-decoration: none;
}
.column-card h2 a:hover { text-decoration: underline; }
.column-card-excerpt {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.65;
  flex: 1;
}
.column-card-more {
  margin-top: 0.85rem;
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--accent);
}
.column-card--soon {
  opacity: 0.92;
}
.column-card--soon .column-card-thumb {
  background: linear-gradient(135deg, #eef3fa, #e4ecf5);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--muted);
}

/* Article */
.article-main { padding: 2rem 0 3.5rem; }
.article-meta {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 1rem;
}
.article-main h1 {
  font-size: clamp(1.35rem, 4vw, 1.75rem);
  font-weight: 800;
  color: var(--main);
  line-height: 1.4;
  margin-bottom: 1.25rem;
}
.article-main h2 {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--main);
  margin: 2rem 0 0.65rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--line);
}
.article-main p { margin: 0.75rem 0; font-size: 0.95rem; }
.article-main ul, .article-main ol {
  margin: 0.75rem 0;
  padding-left: 1.35rem;
  font-size: 0.95rem;
}
.article-main li { margin: 0.35rem 0; }
.article-lead {
  font-size: 1rem;
  color: var(--text);
  font-weight: 600;
  padding: 1rem 1.1rem;
  background: #eef3fa;
  border-radius: 12px;
  border-left: 4px solid var(--accent);
  margin-bottom: 1.5rem !important;
}
.article-cta {
  margin-top: 2.5rem;
  padding: 1.35rem 1.25rem;
  background: linear-gradient(135deg, #eef3fa, #fff);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-align: center;
}
.article-cta p { margin: 0 0 0.85rem; font-size: 0.9rem; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.35rem;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
  margin: 0.25rem;
}
.btn-primary {
  background: linear-gradient(180deg, #2a4d8c, var(--main));
  color: #fff;
}
.btn-secondary {
  background: var(--white);
  color: var(--main);
  border: 1px solid var(--line);
}
.breadcrumb {
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 1rem;
}
.breadcrumb a { font-weight: 600; }

.site-footer {
  padding: 2rem 1rem;
  text-align: center;
  font-size: 0.75rem;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: var(--white);
}
.site-footer a { margin: 0 0.35rem; }