/* 記事ページ（/guide/）共通のスタイル。色と書体は講座ページ index.html と同じ */
:root{
  --navy:#141C3A;
  --navy-2:#3A4466;
  --text:#3d4758;
  --text-sub:#5a6675;
  --line:#dfe4f0;
  --line-2:#C7CEE6;
  --bg-soft:#F5F7FB;
  --bg-tint:#EEF2FA;
  --sky:#E3EAFB;
  --blue:#4063D8;
  --orange:#FF6B2B;
  --orange-text:#C2410C;
  --orange-soft:#FFF1EA;
  --cta:#E4570F;
  --cta-hover:#CC4C0B;
  --shadow-sm:0 6px 18px -8px rgba(20,28,58,.18);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:16px}
body{
  margin:0;background:#fff;color:var(--text);
  font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic Medium","YuGothic","Yu Gothic","Meiryo",sans-serif;
  font-size:16px;font-weight:500;line-height:1.9;
  -webkit-font-smoothing:antialiased;
}
img,svg{display:block;max-width:100%}
img{height:auto}
a{color:var(--navy-2);text-underline-offset:.2em}
p,li,dd,dt,td,th,figcaption,summary,caption{overflow-wrap:anywhere;word-break:auto-phrase;text-wrap:pretty}
p{margin:0}
ul,ol{margin:0;padding:0}
h1,h2,h3{color:var(--navy);margin:0;line-height:1.5;letter-spacing:.02em;word-break:keep-all;overflow-wrap:anywhere;text-wrap:balance}
.ib{display:inline-block}
.skip{position:absolute;left:12px;top:-60px;z-index:100;background:var(--navy);color:#fff;padding:10px 16px;border-radius:8px;text-decoration:none}
.skip:focus{top:12px}
:focus-visible{outline:3px solid var(--blue);outline-offset:3px;border-radius:6px}
.wrap{width:100%;max-width:1080px;margin:0 auto;padding:0 20px}

/* ---------- ヘッダー ---------- */
.site-head{border-bottom:1px solid var(--line)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:64px}
/* ロゴ（保険AIラボ）：シンボルは img/logo-mark.svg、文字は M PLUS Rounded 1c。原案＝ChatGPT（gpt-image-2）のA案（AICourse/brand/） */
.brand{display:flex;align-items:center;gap:10px;color:var(--navy);text-decoration:none}
.brand-mark{width:36px;height:36px;flex:none}
.brand-text{display:flex;flex-direction:column;font-family:"M PLUS Rounded 1c","Hiragino Maru Gothic ProN","Hiragino Sans",sans-serif;line-height:1.15}
.brand-name{font-weight:500;font-size:1.3125rem;letter-spacing:.02em}
.brand-en{margin-top:3px;font-weight:700;font-size:.5625rem;letter-spacing:.36em}
.head-link{flex:none;font-size:.875rem;font-weight:700;color:var(--navy);text-decoration:none;border:1.5px solid var(--line-2);border-radius:999px;padding:8px 16px;line-height:1.3;background:#fff}
.head-link:hover{border-color:var(--navy)}

/* ---------- 記事の頭 ---------- */
.post{max-width:780px;margin:0 auto;padding:12px 20px 72px}
.crumbs ol{list-style:none;display:flex;flex-wrap:wrap;font-size:.8125rem;color:var(--text-sub);line-height:1.6}
.crumbs li+li::before{content:"›";margin:0 8px;color:var(--line-2)}
.crumbs a{color:var(--text-sub)}
.post-head{padding-top:24px}
.post-cat{display:inline-block;font-size:.8125rem;font-weight:800;color:var(--orange-text);letter-spacing:.08em}
.post-head h1{margin-top:8px;font-size:clamp(1.625rem,1.2rem + 1.8vw,2.25rem);font-weight:800;line-height:1.45}
.h1-sub{display:block;margin-top:10px;font-size:.56em;font-weight:700;color:var(--navy-2);line-height:1.5}
.post-lead{margin-top:20px;font-size:1.0625rem;line-height:2}
.post-lead + .post-lead{margin-top:14px}
.post-meta{margin-top:24px;display:flex;align-items:center;gap:12px;padding:12px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);font-size:.875rem;color:var(--text-sub);line-height:1.6}
.post-meta img{width:44px;height:44px;border-radius:50%;object-fit:cover;object-position:50% 18%;flex:none}
.post-meta b{display:block;color:var(--navy);font-size:.9375rem}

/* ---------- 結論・目次 ---------- */
.summary{margin-top:32px;background:var(--bg-soft);border:1px solid var(--line);border-left:4px solid var(--orange);border-radius:16px;padding:20px 22px}
.summary h2{font-size:1.125rem;font-weight:800}
.summary ol{margin-top:10px;padding-left:1.4em;display:grid;gap:8px}
.summary li{font-size:1rem;line-height:1.85}
.summary li::marker{color:var(--orange-text);font-weight:800}
.toc{margin-top:22px;border:1px solid var(--line);border-radius:16px;padding:18px 22px}
.toc-title{font-weight:800;color:var(--navy)}
.toc ol{margin-top:8px;padding-left:1.4em;display:grid;gap:4px}
.toc li{font-size:.9375rem;line-height:1.7}
.toc a{text-decoration:none}
.toc a:hover{text-decoration:underline}

/* ---------- 本文 ---------- */
.post-body h2{margin-top:60px;padding:4px 0 4px 16px;border-left:5px solid var(--navy);font-size:clamp(1.3rem,1.1rem + .9vw,1.625rem);font-weight:800}
.post-body h3{margin-top:36px;padding-bottom:6px;border-bottom:2px solid var(--sky);font-size:1.1875rem;font-weight:800}
.post-body p{margin-top:18px;font-size:1.0625rem;line-height:2}
.post-body ul,.post-body ol{margin-top:16px;padding-left:1.5em;display:grid;gap:8px}
.post-body li{font-size:1.0625rem;line-height:1.85}
.post-body li::marker{color:var(--orange-text)}
.post-body strong{color:var(--navy);background:linear-gradient(transparent 62%,#FFD9C4 62%)}
.post-body a{font-weight:700}
.post-body .src{font-size:.875rem;color:var(--text-sub);margin-top:8px}

.box{margin-top:24px;border-radius:14px;padding:16px 20px;background:var(--bg-soft);border:1px solid var(--line)}
.box--point{border-left:4px solid var(--blue)}
.box--caution{background:var(--orange-soft);border-color:#FFD9C4;border-left:4px solid var(--orange)}
.box-title{font-weight:800;color:var(--navy);font-size:1rem}
.post-body .box p,.post-body .box li{font-size:1rem}
.post-body .box > p:first-child{margin-top:0}
.post-body .box-title + p,.post-body .box-title + ul,.post-body .box-title + ol{margin-top:6px}

.tbl{margin-top:22px;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);border-radius:14px}
.tbl:focus-visible{outline-offset:2px}
.tbl table{width:100%;border-collapse:collapse;min-width:600px;font-size:.9375rem;line-height:1.75}
.tbl--fit table{min-width:0}
.tbl caption{text-align:left;padding:12px 14px 4px;font-weight:800;color:var(--navy);font-size:.9375rem}
.tbl th,.tbl td{padding:12px 14px;border-top:1px solid var(--line);vertical-align:top;text-align:left}
.tbl thead th{background:var(--navy);color:#fff;font-weight:700;border-top:0}
.tbl tbody th{background:var(--bg-soft);color:var(--navy);font-weight:800;white-space:nowrap}
.tbl .ok{color:#1F55B8;font-weight:800}
.tbl .ng{color:var(--orange-text);font-weight:800}
.tbl-hint{display:none;margin-top:6px;font-size:.8125rem;color:var(--text-sub)}

.prompt-label{margin-top:22px;font-size:.875rem;font-weight:800;color:var(--navy)}
.prompt{margin:6px 0 0;background:#F7F9FD;border:1px solid var(--line-2);border-left:4px solid var(--navy);border-radius:12px;padding:16px 18px;white-space:pre-wrap;overflow-wrap:anywhere;font-family:inherit;font-size:.9375rem;line-height:1.9;color:var(--navy)}

.tools{margin-top:18px;display:grid;gap:14px}
.tool{border:1px solid var(--line);border-radius:16px;padding:18px 20px;background:#fff;box-shadow:var(--shadow-sm)}
.post-body .tool h3{margin-top:0;padding-bottom:0;border-bottom:0;font-size:1.125rem}
.tool dl{margin:10px 0 0;display:grid;grid-template-columns:auto minmax(0,1fr);gap:6px 14px}
.tool dt{font-size:.875rem;font-weight:800;color:var(--navy-2);white-space:nowrap}
.tool dd{margin:0;font-size:1rem;line-height:1.8}

/* ---------- よくある質問 ---------- */
.faq{margin-top:20px;display:grid;gap:12px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.faq details[open]{border-color:var(--line-2);box-shadow:var(--shadow-sm)}
.faq summary{list-style:none;cursor:pointer;position:relative;padding:16px 48px 16px 18px;font-weight:700;color:var(--navy);font-size:1rem;line-height:1.7}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:20px;top:24px;width:10px;height:10px;border-right:2px solid var(--navy-2);border-bottom:2px solid var(--navy-2);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg);top:28px}
.post-body .faq p{margin:0;padding:0 18px 18px;font-size:1rem;line-height:1.9}

/* ---------- 著者・講座の案内・関連記事 ---------- */
.post-note{margin-top:36px;font-size:.8125rem;line-height:1.8;color:var(--text-sub)}
.author-box{margin-top:40px;display:grid;grid-template-columns:96px minmax(0,1fr);gap:18px;align-items:start;border:1px solid var(--line);border-radius:18px;padding:20px}
.author-box img{width:96px;height:96px;border-radius:50%;object-fit:cover;object-position:50% 18%}
.author-label{font-size:.8125rem;font-weight:800;color:var(--orange-text);letter-spacing:.06em}
.author-name{font-size:1.125rem;font-weight:800;color:var(--navy);line-height:1.5}
.author-name small{margin-left:8px;font-size:.8125rem;font-weight:500;color:var(--text-sub)}
.author-box p:not(.author-label):not(.author-name){margin-top:6px;font-size:.9375rem;line-height:1.85}
.author-links{margin-top:8px;display:flex;flex-wrap:wrap;gap:4px 16px;list-style:none;font-size:.875rem}

.course-box{margin-top:28px;border-radius:22px;padding:28px 24px;background:linear-gradient(135deg,#F3F6FD,#FFF6F1);border:1px solid var(--line)}
.course-eyebrow{text-align:center;font-size:.8125rem;font-weight:800;color:var(--orange-text);letter-spacing:.08em}
.course-box h2{margin-top:6px;text-align:center;font-size:clamp(1.25rem,1.05rem + .9vw,1.5rem);font-weight:800}
.course-box > p:not(.course-eyebrow){margin-top:12px;font-size:1rem;line-height:1.9}
.course-facts{margin-top:14px;display:flex;flex-wrap:wrap;justify-content:center;gap:6px 8px;list-style:none}
.course-facts li{font-size:.875rem;font-weight:700;color:var(--navy);background:#fff;border:1px solid var(--line);border-radius:999px;padding:4px 12px;line-height:1.6}
.course-actions{margin-top:20px;display:grid;gap:12px;justify-items:center}
.btn-cta{display:inline-flex;align-items:center;justify-content:center;gap:10px;width:100%;max-width:420px;min-height:62px;padding:12px 26px;border-radius:999px;background:var(--cta);color:#fff;text-decoration:none;font-weight:800;font-size:1.125rem;line-height:1.4;letter-spacing:.03em;box-shadow:0 14px 28px -12px rgba(228,87,15,.55),inset 0 -3px 0 rgba(0,0,0,.12);transition:background-color .2s,transform .2s}
.btn-cta:hover{background:var(--cta-hover);transform:translateY(-1px)}
.btn-sub{display:inline-flex;flex-direction:column;align-items:center;justify-content:center;width:100%;max-width:420px;min-height:58px;padding:8px 20px;border-radius:999px;border:2px solid var(--cta);background:#fff;color:var(--orange-text);text-decoration:none;font-weight:800;font-size:1rem;line-height:1.4}
.btn-sub small{font-size:.8125rem;font-weight:700;color:var(--text-sub)}
.btn-sub:hover{background:var(--orange-soft)}
.btn-cta svg{width:20px;height:20px;flex:none}

.related{margin-top:40px}
.related-title{font-weight:800;color:var(--navy);font-size:1.0625rem}
.related ul{list-style:none;margin-top:10px;display:grid;gap:10px}
.related a{display:block;border:1px solid var(--line);border-radius:14px;padding:14px 16px;text-decoration:none;color:var(--navy);font-weight:700;line-height:1.6;background:#fff}
.related a:hover{border-color:var(--navy-2)}
.related small{display:block;margin-top:2px;font-weight:500;color:var(--text-sub);font-size:.875rem}

/* ---------- フッター（講座ページと同じ） ---------- */
.site-foot{background:var(--navy);color:#C7CEE6;padding:40px 0 44px;font-size:.875rem}
.site-foot a{color:#fff}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;align-items:flex-start}
.foot-name{color:#fff;font-weight:800;font-size:1rem}
.foot-sub{display:block;font-size:.8125rem;font-weight:500;color:#C7CEE6}
.foot-links{display:flex;gap:6px 18px;flex-wrap:wrap}
.foot-date{margin-top:8px;font-size:.8125rem;color:#AEB7D3}
.foot-legal{margin-top:20px;font-size:.8125rem;line-height:1.75;color:#AEB7D3}

@media (max-width:767px){
  .post{padding:8px 16px 56px}
  .post-head{padding-top:18px}
  .post-lead,.post-body p,.post-body li{font-size:1rem}
  .summary,.toc{padding:16px 18px}
  .post-body h2{margin-top:48px}
  .tbl-hint{display:block}
  .tbl th,.tbl td{padding:10px 10px}
  .tool{padding:16px}
  .tool dl{grid-template-columns:1fr;gap:0}
  .tool dd + dt{margin-top:6px}
  .author-box{grid-template-columns:72px minmax(0,1fr);gap:14px;padding:16px}
  .author-box img{width:72px;height:72px}
  .course-box{padding:24px 18px}
}
@media (max-width:420px){
  .head-link{padding:7px 12px;font-size:.8125rem}
  .brand-name{font-size:1.1875rem}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .btn-cta{transition:none}
}