:root{
  --bg:#f4f6fb;
  --card:#ffffff;
  --text:#111827;
  --muted:#6b7280;
  --line:rgba(229,231,235,.85);
  --blue:#1d4ed8;
  --blue2:#0b3aa6;
  --chip:#eaf0ff;
  --shadow:0 10px 30px rgba(17,24,39,.08);
  --radius:18px;
}

*{
  box-sizing:border-box;
}

html{
  scroll-behavior:smooth;
}

body{
  margin:0;
  font-family:ui-sans-serif, system-ui, -apple-system,
    "Segoe UI", "Noto Sans JP",
    "Hiragino Kaku Gothic ProN",
    Meiryo, Arial, sans-serif;
  background:linear-gradient(
    180deg,
    #faf7f1 0%,
    #f6f1e7 100%
  );
  color:var(--text);
}

a{
  color:inherit;
}

.container{
  max-width:980px;
  margin:0 auto;
  padding:28px 14px 70px;
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:24px;
  box-shadow:var(--shadow);
}

.columnArticle{
  padding:38px 32px;
}

.columnHero{
  display:block;
  padding-bottom:28px;
  border-bottom:1px solid rgba(229,231,235,.9);
}

.columnAuthorPhoto{
  display:none;
}

.columnCategory{
  display:inline-flex;
  align-items:center;
  margin-bottom:14px;
  padding:7px 13px;
  border-radius:999px;
  background:var(--chip);
  border:1px solid rgba(29,78,216,.18);
  color:#173a8f;
  font-size:13px;
  font-weight:950;
}

.columnArticleTitle{
  margin:0;
  color:#0f2a5a;
  font-size:38px;
  line-height:1.35;
  letter-spacing:.02em;
  font-weight:950;
}

.columnMetaRow{
  margin-top:12px;
  color:#64748b;
  font-size:14px;
  font-weight:850;
  line-height:1.7;
}

.columnContent{
  max-width:760px;
  margin:34px auto 0;
  font-size:17px;
  line-height:2.05;
  font-weight:650;
  color:#374151;
}

.columnContent p{
  margin:0 0 22px;
}

.columnContent h2{
  margin:46px 0 18px;
  padding-left:14px;
  border-left:5px solid var(--blue);
  color:#0f2a5a;
  font-size:28px;
  line-height:1.45;
  font-weight:950;
}

.columnContent h3{
  margin:34px 0 14px;
  color:#0f2a5a;
  font-size:22px;
  line-height:1.5;
  font-weight:950;
}

.columnHighlight{
  margin:28px 0;
  padding:22px 24px;
  border-radius:22px;
  background:#f8fbff;
  border:1px solid rgba(37,99,235,.18);
}

.columnHighlight p{
  margin:0 0 10px;
  color:#0f2a5a;
  font-weight:950;
}

.columnHighlight ul{
  margin:0;
  padding-left:1.3em;
}

.columnHighlight li{
  margin:7px 0;
  font-weight:850;
  color:#374151;
}

.columnNote{
  padding:16px 18px;
  border-radius:18px;
  background:#fff7df;
  border:1px solid rgba(234,154,0,.28);
  color:#0f2a5a;
  font-weight:850;
}

.inlineLink{
  color:var(--blue);
  font-weight:950;
  text-decoration:none;
}

.inlineLink:hover{
  text-decoration:underline;
}

.columnAuthorBox{
  margin-top:26px;
  padding:26px;
}

.columnAuthorBox h2{
  margin:0 0 18px;
  text-align:center;
  color:#0f2a5a;
  font-size:24px;
  font-weight:950;
}

.columnAuthorProfile{
  display:grid;
  grid-template-columns:96px 1fr;
  gap:18px;
  align-items:center;
  max-width:720px;
  margin:0 auto;
}

.columnAuthorProfile img{
  width:96px;
  height:96px;
  border-radius:22px;
  border:1px solid rgba(229,231,235,.9);
  object-fit:cover;
  display:block;
}

.columnAuthorProfile h3{
  margin:0 0 8px;
  color:#0f2a5a;
  font-size:22px;
  font-weight:950;
}

.columnAuthorProfile p{
  margin:0 0 12px;
  color:#374151;
  font-size:15px;
  line-height:1.8;
  font-weight:800;
}

.btn{
  display:inline-flex;
  justify-content:center;
  align-items:center;
  gap:8px;
  padding:12px 18px;
  border-radius:14px;
  border:1px solid rgba(229,231,235,.9);
  background:#fff;
  color:#0f2a5a;
  cursor:pointer;
  font-weight:900;
  text-decoration:none;
  transition:.15s transform ease, .15s background ease, .15s box-shadow ease;
}

.btn:hover{
  transform:translateY(-1px);
}

.btn.primary{
  background:linear-gradient(180deg, var(--blue) 0%, var(--blue2) 100%);
  color:#fff;
  border-color:rgba(29,78,216,.55);
  box-shadow:0 10px 24px rgba(29,78,216,.18);
}

.columnBackLinks{
  margin-top:22px;
  display:flex;
  justify-content:center;
  gap:12px;
  flex-wrap:wrap;
}

@media(max-width:720px){
  .container{
    padding:20px 12px 56px;
  }

  .columnArticle{
    padding:26px 18px;
  }

  .columnArticleTitle{
    font-size:28px;
  }

  .columnMetaRow{
    font-size:13px;
  }

  .columnContent{
    font-size:16px;
    line-height:1.95;
  }

  .columnContent h2{
    font-size:23px;
  }

  .columnContent h3{
    font-size:19px;
  }

  .columnAuthorBox{
    padding:22px 18px;
  }

  .columnAuthorProfile{
    grid-template-columns:72px 1fr;
    gap:14px;
    text-align:left;
  }

  .columnAuthorProfile img{
    width:72px;
    height:72px;
    border-radius:18px;
  }

  .columnAuthorProfile h3{
    font-size:19px;
  }

  .columnAuthorProfile p{
    font-size:14px;
  }

  .columnAuthorProfile .btn{
    width:100%;
  }

  .columnBackLinks .btn{
    width:100%;
  }
}

.columnFigure{
  margin:32px 0;
}

.columnFigure img{
  width:100%;
  border-radius:16px;
  display:block;
}

.columnFigure figcaption{
  margin-top:10px;
  font-size:14px;
  color:#666;
  text-align:center;
}