/* Obstetric Strategist — B2B site styles */
:root{
  --ink:#1a1a1a;
  --ink-soft:#3d3d3d;
  --muted:#6b6b6b;
  --bg:#fafaf8;
  --paper:#ffffff;
  --rule:#e5e5e0;
  --accent:#2a4d6e;        /* deep clinical blue */
  --accent-soft:#eaf0f6;
  --max:1040px;
}
*,*::before,*::after{box-sizing:border-box}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{
  margin:0;color:var(--ink);background:var(--bg);
  font-family:"Inter","Helvetica Neue","Hiragino Sans","Noto Sans JP",sans-serif;
  line-height:1.7;
  font-feature-settings:"palt";
}
.container{max-width:var(--max);margin:0 auto;padding:0 1.5rem}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

/* Header */
.site-header{
  border-bottom:1px solid var(--rule);
  background:var(--paper);
  position:sticky;top:0;z-index:10;
}
.header-inner{
  display:flex;justify-content:space-between;align-items:center;
  padding:1rem 1.5rem;max-width:var(--max);margin:0 auto;
}
.brand{font-weight:600;font-size:1.05rem;letter-spacing:0.02em;color:var(--ink)}
.brand-jp{color:var(--muted);font-weight:400;font-size:.85rem;margin-left:.5rem}
.site-nav a{margin-left:1.5rem;color:var(--ink-soft);font-size:.92rem}

/* Hero */
.hero{
  padding:5rem 0 3rem;border-bottom:1px solid var(--rule);
  background:linear-gradient(180deg,var(--paper) 0%,var(--bg) 100%);
}
.hero h1{
  font-family:"Source Serif Pro","Noto Serif JP",serif;
  font-size:clamp(1.8rem,3.6vw,2.6rem);
  line-height:1.3;margin:0 0 1rem;font-weight:600;
}
.hero .lede{font-size:1.05rem;color:var(--ink-soft);max-width:42rem;margin:0}
.hero .meta{margin-top:1.5rem;color:var(--muted);font-size:.88rem}

/* Sections */
section{padding:3.5rem 0;border-bottom:1px solid var(--rule)}
section h2{
  font-family:"Source Serif Pro","Noto Serif JP",serif;
  font-size:1.55rem;margin:0 0 1.5rem;font-weight:600;
}
section h3{font-size:1.05rem;margin:1.5rem 0 .5rem}

/* Article cards */
.card-grid{display:grid;gap:1.5rem;grid-template-columns:1fr}
@media(min-width:720px){.card-grid{grid-template-columns:1fr 1fr}}
.card{
  background:var(--paper);border:1px solid var(--rule);
  padding:1.5rem;border-radius:4px;
  transition:border-color .15s;
}
.card:hover{border-color:var(--accent)}
.card .tag{
  display:inline-block;font-size:.75rem;color:var(--accent);
  background:var(--accent-soft);padding:.15rem .5rem;border-radius:2px;
  margin-bottom:.75rem;letter-spacing:.05em;
}
.card h3{margin:0 0 .5rem;font-size:1.1rem}
.card h3 a{color:var(--ink)}
.card p{margin:0 0 .75rem;color:var(--ink-soft);font-size:.95rem}
.card .card-meta{font-size:.82rem;color:var(--muted)}

/* Article page */
.article-header{padding:3rem 0 1.5rem;border-bottom:1px solid var(--rule)}
.article-header .tag{
  display:inline-block;font-size:.78rem;color:var(--accent);
  background:var(--accent-soft);padding:.2rem .6rem;border-radius:2px;
  margin-bottom:1rem;
}
.article-header h1{
  font-family:"Source Serif Pro","Noto Serif JP",serif;
  font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.35;margin:0 0 1rem;font-weight:600;
}
.article-header .meta{color:var(--muted);font-size:.88rem}
.article-body{padding:2.5rem 0}
.article-body p{margin:0 0 1.2rem}
.article-body h2{font-size:1.3rem;margin:2.5rem 0 1rem;padding-top:1rem;border-top:1px solid var(--rule)}
.article-body h2:first-child{border-top:none;padding-top:0;margin-top:0}
.article-body figure{margin:2rem 0;background:var(--paper);padding:1rem;border:1px solid var(--rule);border-radius:4px}
.article-body figcaption{font-size:.85rem;color:var(--muted);margin-top:.75rem;text-align:center}

/* CTA */
.cta-box{
  margin:3rem 0;padding:2rem;background:var(--accent-soft);
  border-left:3px solid var(--accent);border-radius:2px;
}
.cta-box h3{margin:0 0 .75rem;color:var(--accent)}
.cta-box p{margin:0 0 1rem}
.btn{
  display:inline-block;padding:.7rem 1.4rem;
  background:var(--accent);color:#fff;font-weight:500;
  border-radius:3px;font-size:.95rem;
}
.btn:hover{background:#1f3a55;text-decoration:none}
.btn-outline{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn-outline:hover{background:var(--accent);color:#fff}

/* Footer */
.site-footer{padding:2.5rem 0;color:var(--muted);font-size:.85rem;text-align:center}
.site-footer a{color:var(--muted)}