:root {
  --teal: #1f4e4a;
  --teal-soft: #e4efe9;
  --coral: #e86a5c;
  --mustard: #d9a441;
  --text: #2c2c2a;
  --muted: #7a7a72;
  --bg: #faf6ec;
  --card: #ffffff;
  --border: #e7e1d2;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: "Hiragino Kaku Gothic ProN", "Hiragino Sans", "Yu Gothic", Meiryo, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.9;
}

header {
  background: var(--teal);
  color: #fff;
  padding: 30px 16px;
  text-align: center;
}

header h1 { font-size: 26px; letter-spacing: 1px; }
header h1 a { color: #fff; text-decoration: none; }
header p { font-size: 13px; opacity: 0.9; margin-top: 8px; letter-spacing: 1px; }
header .tag { display:inline-block; margin-top:12px; font-size:11px; letter-spacing:2px; color: var(--mustard); border:1px solid rgba(217,164,65,.5); border-radius:20px; padding:3px 14px; }

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

.post-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  margin-bottom: 18px;
  transition: border-color .2s;
}
.post-card:hover { border-color: var(--coral); }

.post-card a { color: var(--teal); text-decoration: none; font-weight: bold; font-size: 18px; }
.post-card a:hover { color: var(--coral); }
.post-card .date { color: var(--muted); font-size: 13px; margin-bottom: 4px; }
.post-card .excerpt { font-size: 14px; color: #555; margin-top: 8px; }

article h1 { font-size: 24px; line-height: 1.5; margin-bottom: 8px; }
article .date { color: var(--muted); font-size: 13px; margin-bottom: 28px; }
article h2 {
  font-size: 20px;
  margin: 40px 0 16px;
  padding: 8px 14px;
  background: var(--teal-soft);
  border-left: 4px solid var(--teal);
  border-radius: 3px;
}
article h3 { font-size: 17px; margin: 28px 0 12px; color: var(--coral); }
article p { margin-bottom: 16px; }
article ul, article ol { margin: 0 0 16px 24px; }
article li { margin-bottom: 6px; }
article img { max-width: 100%; height: auto; border-radius: 10px; margin: 8px 0 24px; border: 1px solid var(--border); }

.lead { font-size:19px; font-weight:bold; text-align:center; background:var(--teal-soft); padding:18px; border-radius:8px; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 24px;
  font-size: 14px;
  background: var(--card);
}
th, td { border: 1px solid var(--border); padding: 10px 12px; text-align: left; }
th { background: var(--teal-soft); }

.note {
  background: #fdf3e3;
  border: 1px solid #f0dcb4;
  border-radius: 8px;
  padding: 14px 16px;
  font-size: 13.5px;
  margin: 24px 0;
}

.back { display: inline-block; margin-top: 40px; color: var(--teal); text-decoration: none; }
.back:hover { color: var(--coral); }

footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  padding: 24px 16px 40px;
}