/* Column (article) shared stylesheet — inherits LP design tokens */
:root{
  --ink:#14202c;
  --ink-2:#263546;
  --muted:#607083;
  --subtle:#8793a1;
  --paper:#f4f6f7;
  --surface:#ffffff;
  --surface-2:#eef2f4;
  --line:#d7dee5;
  --deep:#06131f;
  --deep-2:#0d2231;
  --teal:#00a3a3;
  --teal-2:#1fbfb8;
  --civic:#28536b;
  --gold:#b58a48;
  --shadow:0 24px 70px rgba(14,31,45,.14);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.9;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  background:
    linear-gradient(90deg,rgba(20,32,44,.035) 1px,transparent 1px),
    linear-gradient(rgba(20,32,44,.025) 1px,transparent 1px);
  background-size:80px 80px;
  pointer-events:none;
}
img{display:block;max-width:100%;height:auto}
a{color:var(--civic);text-decoration:underline;text-decoration-color:rgba(40,83,107,.35);text-underline-offset:3px}
a:hover{color:var(--teal)}

.container{width:min(1180px,calc(100% - 40px));margin:0 auto}
.article-width{width:min(760px,calc(100% - 40px));margin:0 auto}

/* Header (same look as LP) */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(244,246,247,.92);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-weight:800;font-size:15px;line-height:1.2;color:var(--ink);text-decoration:none}
.brand small{display:block;font-size:11px;font-weight:600;color:var(--muted)}
.brand-mark{width:12px;height:12px;border-radius:2px;background:linear-gradient(135deg,var(--teal),var(--civic));flex:none}
.nav-links{display:flex;align-items:center;gap:20px;font-size:13.5px;font-weight:600}
.nav-links a{color:var(--ink-2);text-decoration:none}
.nav-links a:hover{color:var(--teal)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  min-height:46px;padding:11px 22px;border:1px solid transparent;border-radius:2px;
  font-size:14.5px;font-weight:700;line-height:1.4;text-decoration:none;
  transition:transform .2s ease,background .2s ease,color .2s ease;
}
.btn-primary{background:var(--teal);color:#fff}
.btn-primary:hover{background:var(--teal-2);color:#fff;transform:translateY(-1px)}
.btn-sm{min-height:38px;padding:8px 16px;font-size:13px}
@media (max-width:720px){
  .nav-links a:not(.btn){display:none}
}

/* Breadcrumbs */
.breadcrumbs{padding:18px 0 0;font-size:12.5px;color:var(--subtle)}
.breadcrumbs ol{display:flex;flex-wrap:wrap;gap:6px;list-style:none;margin:0;padding:0}
.breadcrumbs li+li::before{content:"›";margin-right:6px;color:var(--subtle)}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--teal)}

/* Article header */
.article-head{padding:36px 0 8px}
.article-eyebrow{
  display:inline-flex;align-items:center;gap:8px;margin:0 0 14px;
  color:var(--teal);font-size:11.5px;font-weight:800;letter-spacing:.13em;
}
.article-eyebrow::before{content:"";width:18px;height:2px;background:currentColor}
h1{margin:0 0 16px;font-size:clamp(26px,4.6vw,38px);line-height:1.4;font-weight:800}
.article-meta{display:flex;flex-wrap:wrap;gap:14px;margin:0 0 8px;font-size:12.5px;color:var(--subtle)}
.article-meta b{font-weight:600;color:var(--muted)}

/* Article body */
.article-body{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:2px;
  padding:clamp(24px,5vw,48px);
  margin:24px 0 0;
}
.article-body h2{
  margin:2.2em 0 .8em;padding-top:.2em;
  font-size:clamp(20px,3.2vw,26px);line-height:1.45;font-weight:800;
  border-top:1px solid var(--line);padding-top:1.1em;
}
.article-body h2:first-child{margin-top:0;border-top:none;padding-top:0}
.article-body h3{margin:1.8em 0 .6em;font-size:18px;line-height:1.5;font-weight:750}
.article-body p{margin:0 0 1.2em}
.article-body ul,.article-body ol{margin:0 0 1.4em;padding-left:1.4em}
.article-body li{margin-bottom:.5em}
.article-body strong{font-weight:750}
figure{margin:1.6em 0}
figcaption{margin-top:8px;font-size:12.5px;color:var(--subtle)}

/* Components */
.toc{
  background:var(--surface-2);border:1px solid var(--line);border-radius:2px;
  padding:20px 24px;margin:0 0 2em;
}
.toc b{display:block;margin-bottom:8px;font-size:13.5px;color:var(--ink-2)}
.toc ol{margin:0;padding-left:1.3em;font-size:14px}
.toc a{text-decoration:none;color:var(--civic)}
.point-box{
  border:1px solid rgba(0,163,163,.35);border-left:4px solid var(--teal);
  background:rgba(0,163,163,.05);border-radius:2px;
  padding:18px 22px;margin:0 0 1.6em;
}
.point-box b{display:block;margin-bottom:6px;font-size:13.5px;color:var(--teal);letter-spacing:.02em}
.point-box ul{margin:0;padding-left:1.3em}
.note-box{
  border:1px solid var(--line);border-left:4px solid var(--gold);
  background:var(--surface-2);border-radius:2px;
  padding:16px 20px;margin:0 0 1.6em;font-size:14px;color:var(--ink-2);
}
.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 0 1.6em}
@media (max-width:600px){
  .table-scroll::before{content:"← 横にスクロールできます →";display:block;font-size:11px;color:var(--subtle);margin:0 0 6px;text-align:right}
}
.article-body table{
  border-collapse:separate;border-spacing:0;
  width:100%;min-width:560px;font-size:14px;line-height:1.7;
  background:var(--surface);
  border:1px solid var(--line);border-radius:2px;overflow:hidden;
}
.article-body th,.article-body td{
  padding:11px 16px;text-align:left;vertical-align:top;
  border:0;border-bottom:1px solid #e4eaee;
}
.article-body th{
  background:linear-gradient(135deg,var(--deep-2),var(--civic));
  color:#fff;font-weight:700;white-space:nowrap;
  font-size:13px;letter-spacing:.02em;border-bottom:0;
}
.article-body tbody tr:nth-child(even){background:#f4f8f9}
.article-body tbody tr:last-child td{border-bottom:0}
@media (max-width:600px){
  .article-body table{font-size:13px}
  .article-body th,.article-body td{padding:9px 12px}
}

/* Skill components (premium-article-builder / LiDAR tokens) */
.pa-take{
  background:linear-gradient(135deg,var(--deep),var(--deep-2));
  color:#f3f7fa;border-radius:2px;
  padding:24px 26px;margin:2.2em 0 1.6em;
}
.pa-take .lbl{
  display:inline-flex;align-items:center;gap:8px;
  font-size:11px;font-weight:800;letter-spacing:.13em;
  color:var(--teal-2);margin:0 0 12px;
}
.pa-take .lbl::before{content:"";width:18px;height:2px;background:currentColor;flex:none}
.pa-take p{margin:0;font-size:15px;line-height:1.9;color:#dcebf2}
.pa-take strong{color:var(--teal-2);font-weight:750}

.pa-steps{display:grid;gap:14px;margin:0 0 1.6em}
.pa-step{
  display:grid;grid-template-columns:44px 1fr;gap:16px;align-items:start;
  background:var(--surface);border:1px solid var(--line);border-radius:2px;
  padding:16px 18px;
}
.pa-step .num{
  width:44px;height:44px;border-radius:2px;
  background:linear-gradient(135deg,var(--civic),var(--teal));
  color:#fff;font-size:20px;font-weight:800;
  display:flex;align-items:center;justify-content:center;
}
.pa-step .ttl{margin:2px 0 6px;font-size:15.5px;font-weight:750;color:var(--ink);line-height:1.5}
.pa-step p{margin:0;font-size:14px;line-height:1.8;color:var(--ink-2)}

.pa-vs{display:grid;grid-template-columns:1fr;gap:14px;margin:0 0 1.6em}
@media (min-width:600px){.pa-vs{grid-template-columns:1fr 1fr}}
.pa-vs .col{border-radius:2px;padding:18px;border:1px solid}
.pa-vs .neg{background:#faf3e8;border-color:#e6d2ae}
.pa-vs .pos{background:#edf6f4;border-color:#c6e2dc}
.pa-vs .cap{display:flex;align-items:center;gap:8px;font-size:14px;font-weight:750;margin:0 0 10px}
.pa-vs .neg .cap{color:#8f621a}
.pa-vs .pos .cap{color:#0c6e67}
.pa-vs .cap .dot{width:10px;height:10px;border-radius:50%;flex:none}
.pa-vs .neg .dot{background:var(--gold)}
.pa-vs .pos .dot{background:var(--teal)}
.pa-vs p{margin:0;font-size:13.5px;line-height:1.8;color:var(--ink-2)}
@media (max-width:600px){
  .pa-take{padding:18px 16px}
  .pa-step{grid-template-columns:38px 1fr;gap:12px;padding:14px 14px}
  .pa-step .num{width:38px;height:38px;font-size:17px}
}

/* CTA */
.article-cta{
  margin:40px 0 0;border-radius:2px;overflow:hidden;
  background:linear-gradient(135deg,var(--deep),var(--deep-2));
  color:#f3f7fa;padding:clamp(28px,5vw,44px);
  text-align:center;
}
.article-cta h2{margin:0 0 10px;font-size:clamp(19px,3vw,24px);font-weight:800;line-height:1.5}
.article-cta p{margin:0 auto 22px;max-width:560px;font-size:14.5px;color:#b6c4ce}
.article-cta .btn-primary{min-width:220px}

/* Related */
.related{margin:40px 0 0}
.related h2{font-size:18px;font-weight:800;margin:0 0 14px}
.related ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.related a{
  display:block;background:var(--surface);border:1px solid var(--line);border-radius:2px;
  padding:14px 18px;font-size:14.5px;font-weight:600;color:var(--ink-2);text-decoration:none;
}
.related a:hover{border-color:var(--teal);color:var(--teal)}

/* Column index (list page) — magazine layout: featured full-width + vertical card grid */
.page-head{padding:56px 0 8px}
.page-head .lead{color:var(--muted);font-size:15.5px;max-width:640px}
.article-list{display:grid;grid-template-columns:1fr;gap:20px;margin:32px 0 0}
.card{
  display:flex;flex-direction:column;
  background:var(--surface);border:1px solid var(--line);border-radius:2px;
  overflow:hidden;text-decoration:none;color:var(--ink);
  transition:border-color .2s ease,transform .2s ease,box-shadow .2s ease;
}
.card:hover{
  border-color:var(--teal);transform:translateY(-2px);color:var(--ink);
  box-shadow:0 14px 34px rgba(14,31,45,.10);
}
.card-thumb{position:relative;aspect-ratio:16/9;background:var(--surface-2);overflow:hidden;flex:none}
.card-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .35s ease}
.card-thumb::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:28%;
  background:linear-gradient(180deg,rgba(6,19,31,0),rgba(6,19,31,.12));
  pointer-events:none;
}
.card:hover .card-thumb img{transform:scale(1.04)}
.card-body{display:flex;flex-direction:column;flex:1;padding:18px 20px 16px}
.card .card-cat{
  display:inline-flex;align-items:center;gap:8px;align-self:flex-start;
  font-size:11px;font-weight:800;letter-spacing:.13em;
  color:var(--teal);margin:0 0 8px;
}
.card .card-cat::before{content:"";width:18px;height:2px;background:currentColor;flex:none}
.card h2{margin:0 0 8px;font-size:16.5px;line-height:1.55;font-weight:750;transition:color .2s ease}
.card:hover h2{color:var(--civic)}
.card-body h2 + p{
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;
  margin:0 0 14px;font-size:13.5px;color:var(--muted);line-height:1.8;
}
.card time{margin-top:auto;font-size:12px;color:var(--subtle)}
@media (min-width:680px){
  .article-list{grid-template-columns:repeat(2,1fr)}
  .article-list > .card:first-child{grid-column:1/-1}
  .article-list > .card:first-child h2{font-size:clamp(18px,2.8vw,22px);line-height:1.5}
}
@media (min-width:860px){
  .article-list > .card:first-child{flex-direction:row;align-items:stretch}
  .article-list > .card:first-child .card-thumb{flex:0 0 52%;aspect-ratio:auto;min-height:280px}
  .article-list > .card:first-child .card-thumb::after{display:none}
  .article-list > .card:first-child .card-body{padding:28px 32px 24px;justify-content:center}
  .article-list > .card:first-child h2{font-size:clamp(20px,2.2vw,25px)}
  .article-list > .card:first-child .card-body h2 + p{-webkit-line-clamp:4;margin-bottom:18px}
  .article-list > .card:first-child time{margin-top:0}
}
@media (min-width:1020px){
  .article-list{grid-template-columns:repeat(3,1fr)}
}
.empty-state{
  background:var(--surface);border:1px dashed var(--line);border-radius:2px;
  padding:40px;text-align:center;color:var(--muted);font-size:14.5px;margin:32px 0 0;
}

/* Footer */
footer{margin-top:72px;background:var(--deep);color:#8fa2af;padding:40px 0 32px;font-size:12.5px}
.footer-row{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.footer-brand{font-weight:800;color:#e8eef2;font-size:14px}
.footer-links{display:flex;gap:18px}
.footer-links a{color:#b6c4ce;text-decoration:none}
.footer-links a:hover{color:var(--teal-2)}
.disclaimer{margin:6px 0 0;line-height:1.8}

main{padding-bottom:72px}

/* In-article download callout (lead magnet) */
.dl-callout{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
  margin:26px 0;padding:20px 22px;border:1px solid var(--line);border-left:4px solid var(--teal);
  border-radius:2px;background:linear-gradient(180deg,#f2fafa,#ffffff)}
.dl-callout-eyebrow{display:inline-flex;align-items:center;gap:8px;
  margin:0 0 4px;font-size:11px;font-weight:800;letter-spacing:.13em;color:var(--teal)}
.dl-callout-eyebrow::before{content:"";width:18px;height:2px;background:currentColor;flex:none}
.dl-callout-title{margin:0 0 4px;font-size:15px;font-weight:600;color:var(--ink);line-height:1.4}
.dl-callout-desc{margin:0;font-size:13px;color:var(--muted);line-height:1.6}
.dl-callout .btn{flex-shrink:0;white-space:nowrap}
@media(max-width:560px){.dl-callout{padding:18px}.dl-callout .btn{width:100%;text-align:center}}