/* =========================================================
   AIOBoost コラム（M-Lab株式会社）共通スタイル
   ブランドトークンは AIOBoost LP と統一
   ========================================================= */
:root{
  --ink:#13202b; --ink-soft:#3a4b57; --paper:#f6f3ec; --paper-2:#ece7da;
  --line:#cfc7b6; --ember:#d8541f; --ember-soft:#f0a079; --teal:#1f6b6b;
  --ok:#2f7d4f; --white:#ffffff; --radius:14px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Hiragino Sans","Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  color:var(--ink);background:var(--paper);line-height:1.9;-webkit-font-smoothing:antialiased;font-feature-settings:"palt"}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal)}
.wrap{max-width:1040px;margin:0 auto;padding:0 22px}
.container,.wrap-narrow{max-width:760px;margin:0 auto;padding:0 22px}
h1,h2,h3{line-height:1.45;letter-spacing:.01em}
.eyebrow{font-size:12px;letter-spacing:.2em;font-weight:700;color:var(--teal);text-transform:uppercase;display:inline-block;margin-bottom:12px}

/* header / nav */
.site-header,.site-head{background:var(--ink);color:#eef1ec;position:sticky;top:0;z-index:50}
.site-header .inner,.site-head .wrap{max-width:1040px;margin:0 auto;padding:0 22px;display:flex;align-items:center;justify-content:space-between;height:62px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff;font-weight:800;letter-spacing:.02em}
.brand .logo{width:26px;height:26px;border-radius:7px;background:var(--ember);display:flex;align-items:center;justify-content:center;font-size:14px;color:#fff;font-weight:800}
.brand small{display:block;font-size:10.5px;font-weight:600;color:#9fb0b5;letter-spacing:.06em}
.site-header nav,.site-head nav{display:flex;gap:20px;align-items:center}
.site-header nav a,.site-head nav a{color:#cdd6da;text-decoration:none;font-size:13.5px;font-weight:600}
.site-header nav a:hover,.site-head nav a:hover{color:#fff}
.head-cta{background:var(--ember);color:#fff!important;border-radius:999px;padding:8px 16px;font-size:13px;font-weight:800}
.head-cta:hover{background:#e8631f}
@media(max-width:760px){.site-head nav .nav-cat,.site-header nav .nav-cat{display:none}}

/* breadcrumb */
.crumb,.breadcrumb{font-size:12.5px;color:var(--ink-soft);padding:16px 0 0}
.crumb ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;padding:0;margin:0}
.crumb li::after{content:"›";margin-left:6px;color:var(--line)}
.crumb li:last-child::after{content:""}
.crumb a,.breadcrumb a{color:var(--teal);text-decoration:none}
.crumb li:last-child{color:var(--ink-soft);font-weight:600}

/* column TOP hero */
.col-hero{background:radial-gradient(800px 420px at 80% -20%, rgba(216,84,31,.10), transparent 60%),linear-gradient(180deg,#15242f,#1b2e3a);color:#f2efe6;padding:60px 0 56px}
.col-hero h1{font-size:clamp(26px,4vw,38px);font-weight:800;margin:6px 0 16px}
.col-hero p{color:#cdd6da;font-size:clamp(14px,2vw,16.5px);max-width:42em}
.col-hero .eyebrow{color:var(--ember-soft)}

/* visually hidden (SEO/a11y用にDOMには残す) */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* hero banner image (TOP) */
.hero-banner{padding:24px 0 0}
.hero-banner img{width:100%;border-radius:18px;border:1px solid var(--line);box-shadow:0 14px 36px rgba(19,32,43,.12)}
.hero-intro{padding:26px 0 6px}
.hero-intro .eyebrow{color:var(--teal)}
.hero-intro h1{font-size:clamp(23px,3.6vw,34px);font-weight:800;margin:4px 0 14px}
.hero-intro p{color:var(--ink);font-size:clamp(14px,2vw,16.5px);max-width:none;
  background:rgba(31,107,107,.06);border:1px solid rgba(31,107,107,.16);border-left:4px solid var(--teal);
  border-radius:0 12px 12px 0;padding:18px 22px}

/* category nav */
.cat-nav{background:var(--paper);border-bottom:1px solid var(--line);position:sticky;top:62px;z-index:40}
.cat-nav .wrap{display:flex;gap:8px;flex-wrap:wrap;justify-content:center;padding-top:16px;padding-bottom:20px}
.cat-nav a{flex:none;text-decoration:none;font-size:13px;font-weight:700;color:var(--ink-soft);background:var(--white);border:1px solid var(--line);border-radius:999px;padding:7px 15px}
.cat-nav a:hover{border-color:var(--ember-soft);color:var(--ember)}
@media(max-width:760px){.cat-nav{top:0}}

/* category block + cards */
.cat-block{padding:52px 0 8px;scroll-margin-top:120px}
.cat-block .cat-label{display:flex;align-items:baseline;gap:12px;margin-bottom:6px}
.cat-block .cat-label .cat-no{font-size:13px;font-weight:800;color:var(--ember);letter-spacing:.1em}
.cat-block h2{font-size:clamp(20px,3vw,27px);font-weight:800}
.cat-block .cat-desc{color:var(--ink-soft);font-size:15px;margin:8px 0 4px;max-width:44em}
.cards,.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:26px;padding-bottom:8px}
@media(max-width:680px){.cards,.card-grid{grid-template-columns:1fr}}
.card{display:flex;flex-direction:column;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:transform .15s ease, box-shadow .15s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 14px 30px rgba(19,32,43,.12)}
.card-link{text-decoration:none;color:inherit;display:flex;flex-direction:column;height:100%}
.card .thumb{aspect-ratio:16/9;background:linear-gradient(135deg,var(--paper-2),#dcd4c2);position:relative;overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .thumb .ph{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;color:#a99f88;font-size:12px;font-weight:700;letter-spacing:.08em}
.card .card-body{padding:16px 18px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card .card-no{font-size:11px;font-weight:800;color:var(--ember);letter-spacing:.1em}
.card h3,.card .card-title{font-size:16px;font-weight:800;line-height:1.5}
.card .card-more{font-size:12px;color:var(--ember);font-weight:700;margin-top:auto}
.card .card-kw{margin-top:auto;font-size:11.5px;color:var(--ink-soft)}
.card .card-kw span{display:inline-block;background:var(--paper-2);border:1px solid var(--line);border-radius:6px;padding:2px 8px;margin:3px 4px 0 0}

/* article page */
.article .hero{max-width:760px;margin:26px auto 0;padding:0 22px}
.article .hero img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:14px;border:1px solid var(--line)}
.article-head{background:var(--white);border-bottom:1px solid var(--line);padding:8px 0 36px}
.cat-tag{display:inline-block;font-size:12px;font-weight:800;color:var(--ember);letter-spacing:.08em;margin:14px 0 10px;background:rgba(216,84,31,.08);border:1px solid var(--ember-soft);border-radius:7px;padding:3px 11px}
.article h1,.article-head h1{font-size:clamp(23px,3.4vw,33px);font-weight:800;margin:6px 0 14px}
.meta{font-size:12.5px;color:var(--ink-soft);margin:0 0 22px}
.meta a{color:var(--teal);text-decoration:none}
.meta time{font-variant-numeric:tabular-nums}

.article-body,.article .container{padding-bottom:10px}
.lead{font-size:17px;color:var(--ink);background:var(--paper-2);border-left:4px solid var(--ember);border-radius:0 10px 10px 0;padding:18px 20px;margin:24px 0}
.article h2,.article-body h2{font-size:clamp(20px,3vw,26px);font-weight:800;margin:46px 0 14px;padding-bottom:10px;border-bottom:2px solid var(--line);scroll-margin-top:120px}
.article h3,.article-body h3{font-size:clamp(17px,2.4vw,20px);font-weight:800;margin:30px 0 10px}
.article p,.article-body p{margin:14px 0;font-size:16px}
.article ul,.article ol,.article-body ul,.article-body ol{margin:14px 0 14px 1.4em}
.article li{margin:8px 0;font-size:16px}
.article strong{font-weight:800}
.marker{background:linear-gradient(transparent 60%, var(--ember-soft) 60%);font-weight:700}
figure{margin:22px 0}
figure img{border-radius:var(--radius);border:1px solid var(--line)}
figcaption{font-size:12.5px;color:var(--ink-soft);text-align:center;margin-top:8px}

/* toc */
.toc{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin:30px 0}
.toc .toc-title,.toc .toc-h{font-size:13px;font-weight:800;letter-spacing:.08em;color:var(--ink-soft);margin-bottom:10px}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:toc}
.toc li{counter-increment:toc;margin:7px 0}
.toc li::before{content:counter(toc,decimal-leading-zero);color:var(--ember);font-weight:800;font-size:12px;margin-right:9px}
.toc a{color:var(--ink);text-decoration:none;font-size:14.5px}
.toc a:hover{color:var(--ember)}

/* key point / note */
.keypoint,.point{background:rgba(31,107,107,.07);border:1px solid rgba(31,107,107,.25);border-radius:var(--radius);padding:18px 20px;margin:22px 0}
.keypoint .kp-h,.point .pt-h{display:block;font-size:13px;font-weight:800;color:var(--teal);letter-spacing:.06em;margin-bottom:6px}
.keypoint p,.point p{margin:4px 0;font-size:15px}
.note{background:var(--paper-2);border-radius:10px;padding:14px 18px;margin:18px 0;font-size:14.5px;color:var(--ink-soft)}
.note .note-h{display:block;font-weight:800;color:var(--ink);font-size:13px;margin-bottom:4px}
.checklist{list-style:none;margin:14px 0 14px 0!important}
.checklist li{position:relative;padding-left:28px}
.checklist li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}

/* in-article FAQ */
.qa,.faq{margin:22px 0}
.qa details,.faq details{border:1px solid var(--line);border-radius:10px;background:var(--white);margin:10px 0;padding:0 18px}
.qa summary,.faq summary{font-weight:700;font-size:15.5px;cursor:pointer;list-style:none;padding:16px 0;display:flex;justify-content:space-between;gap:14px}
.qa summary::-webkit-details-marker,.faq summary::-webkit-details-marker{display:none}
.qa summary::after,.faq summary::after{content:"＋";color:var(--ember);font-weight:800;flex:none}
.qa details[open] summary::after,.faq details[open] summary::after{content:"−"}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq p{color:var(--ink-soft);font-size:15px;padding:14px 0 18px;margin:0}
.qa .qa-a{color:var(--ink-soft);font-size:15px;padding:14px 0 18px}

/* CTA */
.article-cta,.cta{background:linear-gradient(180deg,#15242f,#1a2c38);color:#eef1ec;border-radius:18px;padding:34px 30px;margin:48px 0;text-align:center}
.article-cta h2,.cta h2{color:#fff;font-size:clamp(20px,3vw,26px);border:none;margin:0 0 12px;padding:0}
.article-cta p,.cta p{color:#b9c3c7;font-size:15px;max-width:34em;margin:0 auto 22px}
.article-cta .btns,.cta .btns{display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.btn,.cta a{display:inline-block;background:var(--ember);color:#fff;font-weight:800;font-size:15px;padding:14px 32px;border-radius:11px;text-decoration:none;letter-spacing:.02em;box-shadow:0 8px 22px rgba(216,84,31,.35);transition:transform .15s,box-shadow .15s}
.btn:hover,.cta a:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(216,84,31,.45)}
.btn.ghost{background:var(--teal);box-shadow:0 8px 22px rgba(31,107,107,.35)}
.btn.ghost:hover{background:#258080}

/* sources / author / related / disclaimer */
.sources{margin:40px 0 0}
.sources h2{font-size:18px;border:none;padding:0;margin:0 0 10px}
.sources ul{margin:0 0 0 1.2em}
.sources .src-note{display:block;font-size:12px;color:var(--ink-soft);margin-top:8px}
.author-box{display:flex;gap:16px;align-items:flex-start;background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin:36px 0}
.author-box .ava,.author-box .author-avatar{flex:none;width:54px;height:54px;border-radius:50%;background:var(--ink);color:var(--paper);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:13px;text-align:center;line-height:1.2}
.author-box .ava-img{flex:none;width:68px;height:68px;border-radius:50%;object-fit:cover;object-position:center 18%;border:1px solid var(--line)}
.author-box .au-meta{font-size:12.5px;color:var(--ink-soft);font-weight:700;margin:0 0 8px}
.author-box .au-name,.author-box .author-name{font-weight:800;font-size:15px;margin:0}
.author-box .author-name a{color:var(--ink);text-decoration:none}
.author-box .au-role,.author-box .author-label{font-size:12.5px;color:var(--teal);font-weight:700;margin:2px 0 8px;display:block}
.author-box .au-desc,.author-box .author-desc{font-size:13.5px;color:var(--ink-soft);margin:0}
.author-box .author-link{margin-top:8px}
.author-box .author-link a{font-size:13px;color:var(--ember);text-decoration:none;font-weight:700}
.related{padding:10px 0 0}
.related h2{font-size:20px;font-weight:800;margin-bottom:16px;border:none;padding:0}
.related .cards,.related .card-grid{margin-top:0}
.disclaimer{font-size:12px;color:var(--ink-soft);background:var(--paper-2);border-radius:10px;padding:14px 16px;margin:28px 0}
.backlink{display:inline-block;margin:24px 0 0;color:var(--teal);text-decoration:none;font-weight:700}

/* table (operator) */
.article table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14.5px}
.article table th,.article table td{border:1px solid var(--line);padding:11px 14px;text-align:left;vertical-align:top}
.article table th{background:var(--paper-2);white-space:nowrap;width:8em;font-weight:800}
.article table a{color:var(--teal)}

/* footer */
.site-footer,footer{background:#0e1a22;color:#7e8e93;font-size:12px;padding:34px 0 28px;margin-top:60px;text-align:center}
.site-footer .footer-logo{height:30px;margin:0 auto 10px}
.site-footer p{margin:6px 0}
footer .wrap{max-width:1040px;margin:0 auto;padding:0 22px}
footer .foot-top{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;margin-bottom:20px;text-align:left}
footer .foot-links,.footer-links{display:flex;flex-wrap:wrap;gap:8px 24px;justify-content:center}
footer a,.site-footer a{color:#aab6ba;text-decoration:none}
footer a:hover,.site-footer a:hover{color:#fff;text-decoration:underline}
footer .foot-brand{color:#cdd6da;font-weight:800}
footer .copy{border-top:1px solid #1b2a33;padding-top:16px}