/* ===== Oripa Articles — shared styles ===== */
:root{
  --navy:#1f3a5f;
  --navy-dark:#16293f;
  --accent:#3b82c4;
  --bg:#f5f7fa;
  --card:#ffffff;
  --text:#222b36;
  --muted:#5b6b7c;
  --line:#e2e8f0;
  --warn-bg:#fff7ed;
  --warn-border:#f4a261;
  --ok-bg:#eefaf3;
  --ok-border:#3cb371;
  --radius:14px;
  --maxw:820px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Hiragino Kaku Gothic ProN","Hiragino Sans","Noto Sans JP",Meiryo,sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

/* header */
.site-header{
  background:var(--navy);
  color:#fff;
  position:sticky;top:0;z-index:10;
  box-shadow:0 2px 8px rgba(0,0,0,.12);
}
.site-header .inner{
  max-width:1080px;margin:0 auto;padding:14px 20px;
  display:flex;align-items:center;justify-content:space-between;
}
.site-header .brand{font-weight:800;font-size:1.1rem;color:#fff;letter-spacing:.02em}
.site-header .brand span{color:#9ec5e8}
.site-header nav a{color:#dce7f2;margin-left:18px;font-size:.92rem}
.site-header nav a:hover{color:#fff;text-decoration:none}

/* hero — アイキャッチ全体を切らずに表示 */
.hero{margin:0 auto;max-width:960px;background:#fff}
.hero img{width:100%;height:auto;display:block}

/* layout */
.container{max-width:var(--maxw);margin:0 auto;padding:0 20px}
.article{padding-bottom:60px}
.breadcrumb{font-size:.82rem;color:var(--muted);margin:22px 0 8px}
.breadcrumb a{color:var(--muted)}
.cat-tag{
  display:inline-block;background:var(--navy);color:#fff;
  font-size:.74rem;font-weight:700;padding:4px 12px;border-radius:999px;margin:18px 0 10px;
}
h1{font-size:1.72rem;line-height:1.5;margin:.2em 0 .5em;color:var(--navy-dark);font-weight:800}
.meta{font-size:.82rem;color:var(--muted);margin-bottom:24px;border-bottom:1px solid var(--line);padding-bottom:16px}
.lead{font-size:1.04rem;color:#33414f;background:#eef3f8;border-left:4px solid var(--accent);padding:16px 18px;border-radius:0 8px 8px 0;margin:24px 0}

h2{
  font-size:1.34rem;color:var(--navy-dark);margin:48px 0 16px;
  padding:10px 0 10px 16px;border-left:6px solid var(--navy);font-weight:800;
}
h3{font-size:1.1rem;color:var(--navy);margin:32px 0 12px;font-weight:700}
p{margin:14px 0}
ul,ol{padding-left:1.4em;margin:14px 0}
li{margin:8px 0}
strong{color:var(--navy-dark)}

/* keypoint（結論ボックス：AIO用の要点） */
.keypoint{
  background:linear-gradient(0deg,#fff,#f3f8fd);
  border:1px solid #cfe0ef;border-left:6px solid var(--accent);
  border-radius:0 12px 12px 0;padding:18px 20px;margin:24px 0;
  box-shadow:0 1px 3px rgba(31,58,95,.06);
}
.keypoint .kp-h{display:block;font-weight:800;color:var(--navy-dark);font-size:.92rem;margin-bottom:6px}
.keypoint .kp-h::before{content:"✓ ";color:var(--accent)}
.keypoint p{margin:0;font-size:1.0rem;line-height:1.8}

/* author-box（著者情報：E-E-A-T / AIO） */
.author-box{display:flex;gap:16px;align-items:flex-start;background:var(--card);border:1px solid var(--line);
  border-radius:14px;padding:18px 20px;margin:36px 0 0;box-shadow:0 1px 3px rgba(31,58,95,.05)}
.author-box .author-avatar{flex:none;width:62px;height:62px;border-radius:50%;background:var(--navy);
  color:#fff;display:flex;align-items:center;justify-content:center;text-align:center;
  font-weight:800;font-size:.66rem;line-height:1.3;letter-spacing:.02em;white-space:nowrap}
.author-box .author-label{display:inline-block;font-size:.72rem;font-weight:700;color:#fff;
  background:var(--accent);border-radius:999px;padding:2px 10px;margin-bottom:6px}
.author-box .author-name{margin:0 0 6px;font-size:1.05rem;font-weight:800;color:var(--navy-dark)}
.author-box .author-name a{color:var(--navy-dark)}
.author-box .author-desc{margin:0 0 8px;font-size:.9rem;line-height:1.7;color:var(--muted)}
.author-box .author-link{margin:0;font-size:.86rem;font-weight:700}

/* sources（参考・一次情報） */
.sources{background:#f7fafc;border:1px solid var(--line);border-radius:12px;padding:18px 22px;margin:30px 0}
.sources h2{border:0;padding:0;margin:0 0 10px;font-size:1.1rem}
.sources ul{margin:0;padding-left:1.2em}
.sources li{margin:6px 0;font-size:.92rem}
.sources .src-note{display:block;margin-top:10px;font-size:.78rem;color:var(--muted)}

/* related（関連記事） */
.related{margin:40px 0 0}
.related > h2{margin-bottom:16px}

/* table of contents */
.toc{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:20px 24px;margin:28px 0;box-shadow:0 1px 3px rgba(0,0,0,.04);
}
.toc .toc-title{font-weight:800;color:var(--navy-dark);margin-bottom:10px;font-size:1rem}
.toc ol{counter-reset:item;list-style:none;padding-left:0;margin:0}
.toc ol li{counter-increment:item;margin:7px 0;padding-left:30px;position:relative;font-size:.94rem}
.toc ol li::before{
  content:counter(item);position:absolute;left:0;top:1px;
  background:var(--navy);color:#fff;width:22px;height:22px;border-radius:50%;
  font-size:.72rem;display:flex;align-items:center;justify-content:center;font-weight:700;
}

/* tables */
table{width:100%;border-collapse:collapse;margin:22px 0;font-size:.92rem;background:var(--card);border-radius:8px;overflow:hidden;box-shadow:0 1px 3px rgba(0,0,0,.05)}
th,td{border:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top}
th{background:var(--navy);color:#fff;font-weight:700}
tbody tr:nth-child(even){background:#f7fafc}

/* callouts */
.note{border-radius:10px;padding:16px 18px;margin:22px 0;font-size:.95rem}
.note.warn{background:var(--warn-bg);border:1px solid var(--warn-border)}
.note.tip{background:var(--ok-bg);border:1px solid var(--ok-border)}
.note .note-h{font-weight:800;display:block;margin-bottom:6px}
.note.warn .note-h{color:#b45309}
.note.tip .note-h{color:#1f8a52}

/* checklist */
.checklist{list-style:none;padding-left:0}
.checklist li{position:relative;padding-left:30px;margin:10px 0}
.checklist li::before{content:"\2714";position:absolute;left:0;color:var(--ok-border);font-weight:800}

/* FAQ */
.faq details{background:var(--card);border:1px solid var(--line);border-radius:10px;margin:12px 0;padding:4px 18px}
.faq summary{font-weight:700;cursor:pointer;padding:12px 0;color:var(--navy-dark);list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::before{content:"Q. ";color:var(--accent);font-weight:800}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq details p{padding-bottom:12px}

/* disclaimer */
.disclaimer{font-size:.8rem;color:var(--muted);background:#eef1f5;border-radius:10px;padding:16px 18px;margin:36px 0 0;line-height:1.7}

/* related / back */
.backlink{display:inline-block;margin:30px 0 0;font-weight:700}

/* footer */
.site-footer{background:var(--navy-dark);color:#c7d2de;text-align:center;padding:28px 20px;font-size:.85rem}
.site-footer a{color:#9ec5e8}
.site-footer p{margin:6px 0}
.site-footer .footer-links{font-size:.82rem}
.site-footer .footer-links a{margin:0 2px}

/* ===== index page ===== */
.index-hero{background:var(--navy);text-align:center}
.index-hero img{width:100%;aspect-ratio:2.8/1;object-fit:cover;object-position:center 40%;display:block}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.cat-section{max-width:1080px;margin:0 auto;padding:18px 20px}
.cat-head{display:flex;align-items:center;gap:12px;margin:46px 0 18px}
.cat-head .num{background:var(--navy);color:#fff;width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:1.1rem;flex:none}
.cat-head h2{border:0;padding:0;margin:0;font-size:1.4rem}
.cat-head .count{color:var(--muted);font-size:.85rem}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:0 2px 6px rgba(0,0,0,.06);transition:transform .15s,box-shadow .15s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:0 8px 20px rgba(31,58,95,.16)}
.card a.card-link{display:flex;flex-direction:column;height:100%;color:inherit}
.card a.card-link:hover{text-decoration:none}
.card .thumb{aspect-ratio:16/9;overflow:hidden;background:#dfe6ee}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .card-body{padding:16px 18px 20px;flex:1;display:flex;flex-direction:column}
.card .card-title{font-weight:700;color:var(--navy-dark);font-size:1.02rem;line-height:1.5;margin:0 0 10px}
.card .card-more{margin-top:auto;color:var(--accent);font-size:.86rem;font-weight:700}

@media(max-width:600px){
  body{font-size:15px}
  h1{font-size:1.42rem}
  h2{font-size:1.18rem}
}