/* 実践型AI講座Biz メディア */
:root{
  --navy:#0F2A52;--navy-deep:#0A1E3D;--blue:#2C6BD8;--blue-soft:#EAF1FD;--cta:#F2780C;--cta-dark:#D96604;
  --ink:#1B2A41;--sub:#5B6B82;--line:#E3E8F0;--bg:#F4F6FB;--card:#fff;
  --jp:'Noto Sans JP',system-ui,sans-serif;--en:'Montserrat','Noto Sans JP',sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--jp);color:var(--ink);background:var(--bg);line-height:1.9;font-size:16px;line-break:strict;overflow-wrap:anywhere}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

/* header */
.hd{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.hd-in{max-width:1160px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:20px}
.logo{font-weight:900;color:var(--navy);font-size:18px;letter-spacing:.02em;white-space:nowrap}
.logo small{display:inline-block;margin-left:8px;font-size:11px;font-weight:700;color:#fff;background:var(--blue);padding:1px 8px 2px;border-radius:999px;vertical-align:2px}
.logo:hover{text-decoration:none}
.nav{margin-left:auto;display:flex;gap:22px;font-size:14px;font-weight:700}
.nav a{color:var(--ink)}
.btn{display:inline-block;font-weight:900;color:#fff;background:linear-gradient(135deg,#FA8A1E,var(--cta) 55%,var(--cta-dark));padding:10px 20px 11px;border-radius:999px;font-size:14px;box-shadow:0 6px 16px rgba(217,102,4,.28);white-space:nowrap}
.btn:hover{text-decoration:none;filter:brightness(1.05)}
.btn.lg{font-size:17px;padding:14px 34px 16px}

/* layout */
.wrap{max-width:1160px;margin:0 auto;padding:20px 16px 64px;display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:32px;align-items:start}
.crumb{max-width:1160px;margin:0 auto;padding:14px 16px 0;font-size:12px;color:var(--sub)}
.crumb a{color:var(--sub)}
.side{position:sticky;top:84px;display:grid;gap:20px}
.box{background:var(--card);border-radius:14px;padding:22px 20px;box-shadow:0 2px 10px rgba(15,42,82,.05)}
.box h3{font-size:15px;font-weight:900;color:var(--navy);padding-left:10px;border-left:4px solid var(--blue);margin-bottom:14px;line-height:1.4}
.search{display:flex;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.search input{flex:1;min-width:0;border:0;padding:10px 12px;font:inherit;font-size:14px;outline:none}
.search button{border:0;background:var(--blue);color:#fff;padding:0 14px;cursor:pointer;font-size:15px}
.side-list{list-style:none}
.side-list li{padding:11px 0;border-bottom:1px dashed var(--line);font-size:13.5px;font-weight:700;line-height:1.6}
.side-list li:last-child{border-bottom:0;padding-bottom:0}
.side-list a{color:var(--ink)}
.cats{display:flex;flex-wrap:wrap;gap:8px}
.cats a{font-size:12.5px;font-weight:700;color:var(--navy);background:var(--blue-soft);padding:4px 12px 5px;border-radius:999px}

/* index */
.page-title{font-size:26px;font-weight:900;color:var(--navy);margin-bottom:6px;line-height:1.4}
.page-desc{color:var(--sub);font-size:14px;margin-bottom:22px}
.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
.card{background:var(--card);border-radius:14px;overflow:hidden;box-shadow:0 2px 10px rgba(15,42,82,.05);transition:transform .2s,box-shadow .2s;display:block;color:var(--ink)}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 26px rgba(15,42,82,.12);text-decoration:none}
.card img{aspect-ratio:1200/630;object-fit:cover;width:100%}
.card .b{padding:14px 18px 18px}
.card .d{font-size:12px;color:var(--sub)}
.card .t{font-size:15.5px;font-weight:700;line-height:1.65;margin-top:4px}
.pager{display:flex;justify-content:center;gap:8px;margin-top:34px}
.pager a,.pager span{min-width:40px;height:40px;display:grid;place-items:center;border-radius:8px;background:#fff;font-weight:700;font-size:14px;color:var(--navy);box-shadow:0 2px 8px rgba(15,42,82,.06)}
.pager span{background:var(--navy);color:#fff}
.none{background:#fff;border-radius:14px;padding:30px;text-align:center;color:var(--sub)}

/* article */
.art{background:var(--card);border-radius:16px;padding:36px 40px 44px;box-shadow:0 2px 10px rgba(15,42,82,.05)}
.art .cat{display:inline-block;font-size:12px;font-weight:700;color:var(--blue);background:var(--blue-soft);padding:2px 12px 3px;border-radius:999px;margin-bottom:10px}
.art h1{font-size:28px;font-weight:900;line-height:1.5;color:var(--navy)}
.meta{font-size:12.5px;color:var(--sub);margin:10px 0 20px}
.eyecatch{border-radius:12px;width:100%;aspect-ratio:1200/630;margin-bottom:26px}
.lead p{margin-bottom:1.2em}
.toc{background:#F7F9FC;border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:30px 0}
.toc summary{font-weight:900;color:var(--navy);cursor:pointer;font-size:16px}
.toc ol{margin:12px 0 0 1.3em;font-size:14.5px}
.toc ol ol{margin-top:2px;font-size:13.5px;list-style:disc}
.toc li{margin:4px 0}
.toc a{color:var(--ink)}
.body h2{font-size:23px;font-weight:900;color:var(--navy);line-height:1.5;margin:56px 0 20px;padding:14px 18px;background:var(--blue-soft);border-left:6px solid var(--blue);border-radius:4px 10px 10px 4px;scroll-margin-top:84px}
.body h3{font-size:19px;font-weight:900;color:var(--navy);line-height:1.55;margin:38px 0 14px;padding:4px 0 4px 14px;border-left:5px solid var(--cta);scroll-margin-top:84px}
.body p{margin-bottom:1.3em}
.body ul,.body ol{margin:0 0 1.3em 1.5em}
.body li{margin-bottom:.4em}
.body strong{background:linear-gradient(transparent 62%,#FFE2BF 62%);font-weight:700}
.body blockquote{border-left:4px solid var(--line);padding:4px 16px;color:var(--sub);margin-bottom:1.3em}
.tbl{overflow-x:auto;margin-bottom:1.5em;border-radius:10px;border:1px solid var(--line)}
.body table{border-collapse:collapse;width:100%;min-width:560px;font-size:14px;line-height:1.7}
.body th{background:var(--navy);color:#fff;font-weight:700;padding:10px 12px;text-align:left;white-space:nowrap}
.body td{padding:10px 12px;border-top:1px solid var(--line);vertical-align:top}
.body tr:nth-child(even) td{background:#FAFBFD}
.body pre{position:relative;background:#0F1E36;color:#E8EEF8;border-radius:12px;padding:40px 18px 18px;margin-bottom:1.5em;overflow-x:auto;font-size:13.5px;line-height:1.8}
.body pre code{font-family:ui-monospace,Consolas,'Noto Sans JP',monospace;white-space:pre-wrap;word-break:break-word;background:none;padding:0;color:inherit}
.body code{background:#EEF2F8;padding:1px 6px;border-radius:4px;font-size:.92em}
.copy{position:absolute;top:8px;right:8px;border:0;border-radius:6px;background:rgba(255,255,255,.14);color:#fff;font-size:12px;font-weight:700;padding:4px 10px;cursor:pointer;font-family:var(--jp)}
.copy:hover{background:rgba(255,255,255,.26)}
.faq dt{font-weight:900;color:var(--navy);padding:14px 16px 14px 46px;background:#F7F9FC;border-radius:10px;position:relative;margin-top:14px;line-height:1.6}
.faq dt:before{content:"Q";position:absolute;left:16px;top:12px;font-family:var(--en);font-weight:800;color:var(--blue);font-size:19px}
.faq dd{padding:12px 16px 4px 46px;position:relative}
.faq dd:before{content:"A";position:absolute;left:16px;top:10px;font-family:var(--en);font-weight:800;color:var(--cta);font-size:19px}
.src{font-size:13px;color:var(--sub);margin-top:40px;padding-top:18px;border-top:1px solid var(--line)}
.src ul{margin:6px 0 0 1.3em}
.src a{color:var(--sub);text-decoration:underline}
.author{display:flex;gap:14px;align-items:center;background:#F7F9FC;border-radius:12px;padding:16px 18px;margin-top:30px;font-size:13.5px;line-height:1.7}
.author b{color:var(--navy)}
.rel{margin-top:34px}
.rel h2{font-size:20px;font-weight:900;color:var(--navy);margin-bottom:16px}

.shot{margin:4px 0 22px}
.shot a{display:block;border:1px solid var(--line);border-radius:12px;overflow:hidden;box-shadow:0 6px 18px rgba(15,42,82,.08)}
.shot img{width:100%;aspect-ratio:960/600;object-fit:cover;object-position:top}
.shot figcaption{font-size:12px;color:var(--sub);margin-top:6px;text-align:right}
.shot figcaption a{color:var(--sub);text-decoration:underline}


/* CTA（紺背景＋あしらい） */
.cta-box,.side-cta{position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(60% 80% at 100% 0%,rgba(64,128,240,.7) 0%,rgba(44,107,216,0) 60%),
    radial-gradient(50% 70% at 0% 100%,rgba(242,120,12,.45) 0%,rgba(242,120,12,0) 62%),
    linear-gradient(160deg,#16356A 0%,#0F2A52 48%,#081834 100%)}
.deco{position:absolute;pointer-events:none}
.deco.ring{border-radius:50%;border:3px solid rgba(118,166,246,.55)}
.deco.dots{background-image:radial-gradient(rgba(255,255,255,.5) 1.5px,transparent 1.7px);background-size:16px 16px;opacity:.5}
.deco.wm{font-family:var(--en);font-weight:800;font-size:170px;line-height:1;color:#fff;opacity:.06;letter-spacing:-.03em}
.zb{display:inline-block;background:linear-gradient(120deg,#FA8A1E,var(--cta-dark));color:#fff;padding:0 .22em .04em;margin:0 .08em;line-height:1.25;box-shadow:0 6px 18px rgba(217,102,4,.4)}
.zb em{font-style:normal;font-family:var(--en);font-size:1.2em;letter-spacing:-.01em}
.ul{background-image:linear-gradient(100deg,rgba(255,170,74,.95),rgba(255,204,132,.9) 34%,rgba(150,190,252,.9) 78%,rgba(118,166,246,.92));background-repeat:no-repeat;background-position:0 90%;background-size:100% .38em;padding:0 .06em}
.btn .ar{display:inline-block;margin-left:.5em;transition:transform .2s}
.btn:hover .ar{transform:translateX(4px)}

.cta-box{border-radius:18px;padding:30px 30px 30px;margin:32px 0;display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:8px 20px;box-shadow:0 14px 34px rgba(10,30,61,.25)}
.cta-box .r1{width:300px;height:300px;right:-110px;top:-130px}
.cta-box .r2{width:190px;height:190px;left:-70px;bottom:-90px;border-color:rgba(250,138,30,.75);border-width:4px}
.cta-box .dots{width:110px;height:80px;right:270px;top:22px}
.cta-box .wm{right:220px;bottom:-34px}
.cta-main,.cta-vis,.cta-box .c{position:relative;z-index:1}
.cta-box .k{font-size:11.5px;font-weight:700;color:#A9C4F0;letter-spacing:.08em}
.cta-box .tag{display:inline-block;margin-top:8px;font-size:13.5px;font-weight:900;background:#fff;color:var(--navy);padding:2px 12px 3px;transform:rotate(-2deg)}
.cta-box .h{font-size:27px;font-weight:900;line-height:1.6;margin:10px 0 14px;text-shadow:0 4px 18px rgba(4,14,34,.5)}
.cta-box ul{list-style:none;font-size:14.5px;line-height:1.75}
.cta-box li{padding-left:1.7em;position:relative;margin-bottom:5px}
.cta-box li:before{content:"✓";position:absolute;left:0;top:.2em;width:1.25em;height:1.25em;line-height:1.25em;text-align:center;border-radius:50%;background:var(--cta);color:#fff;font-size:.8em;font-weight:900}
.cta-box li b{color:#FFC47A;font-weight:900}
.cta-vis{min-height:210px}
.cta-vis img{position:absolute;width:190px;aspect-ratio:4/3;object-fit:cover;border-radius:10px;border:3px solid #fff;box-shadow:0 14px 30px rgba(3,10,28,.55)}
.cta-vis .v1{right:44px;top:0;transform:rotate(-8deg)}
.cta-vis .v2{right:-14px;top:64px;transform:rotate(6deg)}
.cta-vis .v3{right:70px;top:126px;transform:rotate(-3deg);width:160px}
.cta-box .c{grid-column:1/-1;text-align:center;margin-top:14px}
.cta-box .n{font-size:12px;color:#C5D4EC;margin-top:10px}

.side-cta{text-align:center;padding-top:26px}
.side-cta .r1{width:200px;height:200px;right:-90px;top:-90px}
.side-cta .dots{width:80px;height:64px;left:14px;top:14px}
.side-cta>*:not(.deco){position:relative;z-index:1}
.side-cta .sv{width:150px;margin:0 auto 14px;border-radius:9px;border:3px solid #fff;box-shadow:0 12px 26px rgba(3,10,28,.55);transform:rotate(-4deg)}
.side-cta .tag{display:inline-block;font-size:12px;font-weight:900;background:#fff;color:var(--navy);padding:1px 10px 2px;margin-bottom:8px}
.side-cta strong{display:block;font-size:20px;font-weight:900;line-height:1.7;margin-bottom:10px;text-shadow:0 4px 14px rgba(4,14,34,.5)}
.side-cta .mini{display:flex;justify-content:center;gap:6px;margin-bottom:14px}
.side-cta .mini span{font-size:11.5px;font-weight:700;border:1px solid rgba(255,255,255,.5);border-radius:999px;padding:1px 9px 2px}

/* footer */
.ft{background:var(--navy-deep);color:#B9C7DE;font-size:13px;padding:28px 16px;text-align:center}
.ft a{color:#B9C7DE;margin:0 8px}

@media (max-width:900px){
  .wrap{grid-template-columns:minmax(0,1fr);gap:24px}
  .side{position:static}
  .nav{display:none}
  .hd-in{justify-content:space-between}
  .art{padding:24px 18px 30px;border-radius:12px}
  .art h1{font-size:22px}
  .body h2{font-size:19px;margin-top:44px;padding:12px 14px}
  .body h3{font-size:17px}
  .cards{grid-template-columns:minmax(0,1fr)}
  .btn.lg{font-size:16px;padding:13px 26px 15px}
  .cta-box{grid-template-columns:minmax(0,1fr);padding:24px 18px 24px}
  .cta-box .h{font-size:22px}
  .cta-vis{min-height:150px;margin-top:8px}
  .cta-vis img{width:150px}
  .cta-vis .v1{right:auto;left:8%;top:0}
  .cta-vis .v2{right:8%;top:14px}
  .cta-vis .v3{display:none}
  .cta-box .dots,.cta-box .wm{display:none}
}