/* =========================================================================
   AI社員 by Refine International — 共有デザインシステム
   既存LP「AI社員LP 白ベース」から抽出したトークンに準拠
   ========================================================================= */
@import url('https://fonts.googleapis.com/css2?family=Zen+Kaku+Gothic+New:wght@400;500;700;900&family=Noto+Sans+JP:wght@400;500;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root{
  --bg:#faf8f4;
  --bg-soft:#f4f0e9;
  --bg-footer:#f1ede6;
  --ink:#211e1a;
  --ink-2:rgba(45,40,34,0.72);
  --ink-3:rgba(45,40,34,0.55);
  --ink-4:rgba(45,40,34,0.4);
  --line:rgba(30,26,22,0.08);
  --line-soft:rgba(30,26,22,0.06);
  --line-strong:rgba(30,26,22,0.14);
  --accent:#4f46e5;
  --accent-d:#3730a3;
  --accent-tint:rgba(79,70,229,0.1);
  --accent-tint-2:rgba(79,70,229,0.14);
  --dark:#0a0b0d;
  --dark-2:#16181c;
  --radius:16px;
  --radius-lg:22px;
  --radius-sm:10px;
  --shadow-sm:0 1px 3px rgba(30,26,22,0.05), 0 6px 20px rgba(30,26,22,0.04);
  --shadow-md:0 10px 40px rgba(30,26,22,0.08);
  --maxw:1200px;
  --font-head:'Zen Kaku Gothic New', 'Noto Sans JP', sans-serif;
  --font-body:'Noto Sans JP', 'Zen Kaku Gothic New', sans-serif;
  --font-mono:'Space Grotesk', 'Noto Sans JP', sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{overflow-x:hidden}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .18s ease, opacity .18s ease}
a:hover{color:var(--accent-d)}
::selection{background:var(--accent-tint-2);color:var(--ink)}

/* ---------- layout ---------- */
.container{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.container-narrow{max-width:820px;margin:0 auto;padding:0 24px}
.section{padding:clamp(56px,7vw,96px) 0}
.section--soft{background:linear-gradient(180deg,rgba(79,70,229,0.05),transparent);border-top:1px solid var(--line-soft)}
.section--line{border-top:1px solid var(--line-soft)}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  backdrop-filter:blur(14px);
  background:rgba(250,248,244,0.82);
  border-bottom:1px solid rgba(30,26,22,0.07);
}
.site-header .container{display:flex;align-items:center;gap:16px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--font-head);font-weight:900;font-size:19px;letter-spacing:-.01em}
.brand .brand-mark{
  width:32px;height:32px;flex:none;font-size:0;color:transparent;
  background:url('../logo/favicon.png?v=2') center/contain no-repeat;
  filter:drop-shadow(0 3px 8px rgba(79,70,229,0.32));
}
.brand small{display:block;font-family:var(--font-body);font-weight:500;font-size:10.5px;color:var(--ink-3);letter-spacing:.04em;margin-top:-2px}
.site-nav{margin-left:auto;display:flex;align-items:center;gap:4px;flex-wrap:wrap;justify-content:flex-end}
.site-nav a{padding:8px 14px;font-size:15px;font-weight:600;color:var(--ink-2);border-radius:10px}
.site-nav a:hover{color:var(--accent-d);background:var(--accent-tint)}
.nav-toggle{display:none}
.site-nav a.btn-primary{background:var(--accent);color:#fff;font-weight:800}
.site-nav a.btn-primary:hover{background:var(--accent-d);color:#fff}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-weight:700;font-size:15px;line-height:1;
  padding:14px 24px;border-radius:999px;border:1px solid transparent;cursor:pointer;
  transition:transform .16s ease, box-shadow .16s ease, background .16s ease;white-space:nowrap;
}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 8px 22px rgba(79,70,229,0.32)}
.btn-primary:hover{background:var(--accent-d);color:#fff;box-shadow:0 12px 30px rgba(79,70,229,0.4)}
.btn-dark{background:var(--ink);color:var(--bg)}
.btn-dark:hover{background:#000;color:var(--bg)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-strong)}
.btn-ghost:hover{background:rgba(30,26,22,0.04);color:var(--ink)}
.btn-sm{padding:10px 18px;font-size:13.5px}
.btn-lg{padding:17px 32px;font-size:16px}

/* ---------- type helpers ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-weight:600;font-size:12.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--accent-d);margin-bottom:16px;
}
.eyebrow::before{content:"";width:22px;height:1.5px;background:var(--accent);border-radius:2px}
h1,h2,h3,h4{font-family:var(--font-head);font-weight:900;letter-spacing:-.01em;line-height:1.28;color:var(--ink)}
.h1{font-size:clamp(32px,5vw,56px);line-height:1.14}
.h2{font-size:clamp(28px,4vw,46px)}
.h3{font-size:clamp(20px,2.6vw,26px)}
.lead{font-size:clamp(16px,1.85vw,19px);color:var(--ink-2);line-height:1.9;font-weight:500}
.accent{color:var(--accent-d)}
.mark{background:linear-gradient(transparent 62%, rgba(79,70,229,0.28) 62%)}
.mono{font-family:var(--font-mono)}
.center{text-align:center}
.muted{color:var(--ink-3)}

/* ---------- pills / tags ---------- */
.pill{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12.5px;font-weight:700;padding:5px 12px;border-radius:999px;
  background:var(--accent-tint);color:var(--accent-d);
}
.pill--ghost{background:rgba(30,26,22,0.04);color:var(--ink-2)}
.tag{
  display:inline-flex;font-size:12px;font-weight:500;padding:4px 11px;border-radius:999px;
  border:1px solid var(--line-strong);color:var(--ink-2);
}
.tag:hover{border-color:var(--accent);color:var(--accent-d)}

/* ---------- cards ---------- */
.grid{display:grid;gap:clamp(18px,2.4vw,28px)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-auto{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:clamp(22px,3vw,30px);box-shadow:var(--shadow-sm);
  transition:transform .2s ease, box-shadow .2s ease, border-color .2s ease;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-md);border-color:var(--line-strong)}
.card .card-ico{
  width:46px;height:46px;border-radius:12px;display:grid;place-items:center;
  background:var(--accent-tint);color:var(--accent-d);font-size:22px;margin-bottom:16px;
}
.card h3{font-size:20px;margin-bottom:10px}
.card p{color:var(--ink-2);font-size:15.5px;line-height:1.85;font-weight:500}

/* ---------- breadcrumb ---------- */
.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--ink-3);padding:18px 0}
.breadcrumb a:hover{color:var(--accent-d)}
.breadcrumb .sep{opacity:.5}

/* ---------- article prose ---------- */
.prose{font-size:16.5px;line-height:2.05;color:#2c2822}
.prose > *+*{margin-top:1.35em}
.prose h2{
  font-size:clamp(23px,3.2vw,32px);margin-top:2.4em;margin-bottom:.2em;line-height:1.35;
  padding-top:.6em;position:relative;
}
.prose h2::before{content:"";position:absolute;top:0;left:0;width:40px;height:3px;background:var(--accent);border-radius:2px}
.prose h3{font-size:clamp(18px,2.4vw,22px);margin-top:2em;margin-bottom:.1em;line-height:1.45}
.prose p{margin-top:1.2em}
.prose a{color:var(--accent-d);text-decoration:underline;text-decoration-color:var(--accent-tint-2);text-underline-offset:3px}
.prose a:hover{text-decoration-color:var(--accent)}
.prose strong{font-weight:700;color:var(--ink)}
.prose ul,.prose ol{margin-top:1.2em;padding-left:1.4em}
.prose li{margin-top:.5em}
.prose ul li::marker{color:var(--accent)}
.prose blockquote{
  margin-top:1.5em;padding:6px 0 6px 22px;border-left:3px solid var(--accent);
  color:var(--ink-2);font-size:16px;
}
.prose img{border-radius:var(--radius);border:1px solid var(--line);margin-top:1.6em}
.prose figure figcaption{font-size:13px;color:var(--ink-3);margin-top:8px;text-align:center}
.prose hr{border:none;border-top:1px solid var(--line);margin:2.4em 0}
.prose table{width:100%;border-collapse:collapse;margin-top:1.6em;font-size:14.5px}
.prose th,.prose td{border:1px solid var(--line-strong);padding:11px 14px;text-align:left}
.prose th{background:var(--bg-soft);font-weight:700}

/* ---------- callouts ---------- */
.callout{
  background:#fff;border:1px solid var(--line);border-left:4px solid var(--accent);
  border-radius:var(--radius-sm);padding:20px 24px;margin-top:1.6em;box-shadow:var(--shadow-sm);
}
.callout .callout-title{font-family:var(--font-head);font-weight:900;font-size:15px;margin-bottom:8px;color:var(--ink)}
.callout p{margin:0;font-size:15px;color:var(--ink-2)}
.tldr{background:var(--dark);color:#efeae4;border-radius:var(--radius);padding:24px 28px;margin:1.8em 0}
.tldr .callout-title{color:var(--accent);font-family:var(--font-head);font-weight:900;font-size:13px;letter-spacing:.1em;text-transform:uppercase;margin-bottom:12px}
.tldr ul{margin:0;padding-left:1.2em}
.tldr li{margin-top:.5em;color:#d8d2ca;font-size:15px}
.tldr li::marker{color:var(--accent)}

/* ---------- table of contents ---------- */
.toc{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin:2em 0}
.toc .toc-title{font-family:var(--font-head);font-weight:900;font-size:14px;margin-bottom:12px}
.toc ol{list-style:none;counter-reset:toc;padding:0}
.toc li{counter-increment:toc;margin-top:9px;padding-left:30px;position:relative;font-size:14.5px}
.toc li::before{content:counter(toc,decimal-leading-zero);position:absolute;left:0;font-family:var(--font-mono);font-weight:600;font-size:12px;color:var(--accent-d)}
.toc a{color:var(--ink-2)}
.toc a:hover{color:var(--accent-d)}

/* ---------- FAQ (details) ---------- */
.faq{border-top:1px solid var(--line)}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{
  list-style:none;cursor:pointer;padding:22px 44px 22px 4px;position:relative;
  font-family:var(--font-head);font-weight:700;font-size:16.5px;line-height:1.6;
}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{
  content:"+";position:absolute;right:6px;top:20px;font-family:var(--font-mono);font-size:24px;font-weight:500;
  color:var(--accent);transition:transform .2s ease;
}
.faq details[open] summary::after{content:"–"}
.faq .faq-body{padding:0 4px 24px;color:var(--ink-2);font-size:15px;line-height:1.9}

/* ---------- author box ---------- */
.author{display:flex;gap:16px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:20px 24px;box-shadow:var(--shadow-sm)}
.author .avatar{width:56px;height:56px;border-radius:50%;background:var(--accent-tint);color:var(--accent-d);display:grid;place-items:center;font-family:var(--font-head);font-weight:900;font-size:20px;flex:none}
.author .author-name{font-family:var(--font-head);font-weight:900;font-size:16px}
.author .author-role{font-size:13px;color:var(--ink-3)}

/* ---------- CTA band ---------- */
.cta-band{background:var(--dark);color:#efeae4;border-radius:var(--radius-lg);padding:clamp(34px,5vw,56px);text-align:center;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 80% -10%,rgba(79,70,229,0.28),transparent);pointer-events:none}
.cta-band .eyebrow{color:var(--accent)}
.cta-band h2{color:#fff;font-size:clamp(24px,3.4vw,38px);margin-bottom:14px;position:relative}
.cta-band p{color:#c9c3bb;max-width:560px;margin:0 auto 26px;position:relative}
.cta-band .btn-row{position:relative;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.cta-band .btn-ghost{color:#efeae4;border-color:rgba(255,255,255,0.24)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,0.08);color:#fff}

/* ---------- related posts / post cards ---------- */
.post-card{display:flex;flex-direction:column;overflow:hidden;padding:0}
.post-card .thumb{aspect-ratio:16/9;background:linear-gradient(135deg,#f0e7df,#e8ddd3);position:relative;display:grid;place-items:center;overflow:hidden}
.post-card .thumb .thumb-emoji{font-size:44px;opacity:.9}
.post-card .thumb .cat{position:absolute;top:12px;left:12px}
.post-card .post-body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.post-card .post-meta{font-family:var(--font-mono);font-size:12px;color:var(--ink-3);margin-bottom:8px}
.post-card h3{font-size:17.5px;line-height:1.5;margin-bottom:10px}
.post-card p{font-size:13.5px;color:var(--ink-2);margin-bottom:16px;flex:1}
.post-card .read-more{font-size:13px;font-weight:700;color:var(--accent-d);margin-top:auto}

/* ---------- forms ---------- */
.field{margin-bottom:18px}
.field label{display:block;font-size:13.5px;font-weight:700;margin-bottom:7px}
.field .req{color:var(--accent-d);font-size:11px;margin-left:6px}
.field input,.field select,.field textarea{
  width:100%;font-family:var(--font-body);font-size:15px;color:var(--ink);
  padding:13px 15px;border:1px solid var(--line-strong);border-radius:12px;background:#fff;transition:border-color .16s ease, box-shadow .16s ease;
}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-tint)}
.field textarea{resize:vertical;min-height:120px}

/* ---------- fixed bottom CTA bar (追従) ---------- */
.cta-bar{
  position:fixed;left:0;right:0;bottom:0;z-index:65;
  background:rgba(255,255,255,0.96);backdrop-filter:blur(12px);
  border-top:1px solid var(--line);box-shadow:0 -6px 24px rgba(30,26,22,0.08);
  transform:translateY(120%);transition:transform .35s cubic-bezier(.2,.8,.2,1);
}
.cta-bar.show{transform:translateY(0)}
.cta-bar-inner{max-width:var(--maxw);margin:0 auto;padding:12px 24px;display:flex;align-items:center;gap:18px}
.cta-bar .cta-msg{flex:1;font-family:var(--font-head);font-weight:900;font-size:15.5px;line-height:1.3;color:var(--ink)}
.cta-bar .cta-msg small{display:block;font-family:var(--font-body);font-weight:500;font-size:12px;color:var(--ink-3);margin-top:3px}
.cta-bar .cta-actions{display:flex;gap:10px;align-items:center}
.cta-bar .cta-close{border:none;background:none;color:var(--ink-4);font-size:20px;cursor:pointer;line-height:1;padding:6px;margin-left:4px}
.cta-bar .cta-close:hover{color:var(--ink-2)}
@media(max-width:720px){
  .cta-bar-inner{padding:10px 14px;gap:10px}
  .cta-bar .cta-msg{display:none}
  .cta-bar .cta-actions{flex:1}
  .cta-bar .cta-actions .btn{flex:1}
}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:var(--bg-footer)}
.site-footer .foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px;padding:clamp(44px,6vw,68px) 0 40px}
.site-footer .brand{margin-bottom:14px}
.site-footer .foot-about{font-size:13.5px;color:var(--ink-3);line-height:1.9;max-width:300px}
.site-footer h4{font-family:var(--font-head);font-weight:700;font-size:13px;letter-spacing:.04em;margin-bottom:14px;color:var(--ink)}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:9px}
.site-footer a{font-size:13.5px;color:var(--ink-2)}
.site-footer a:hover{color:var(--accent-d)}
.site-footer .foot-bottom{border-top:1px solid var(--line);padding:20px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;font-size:12.5px;color:var(--ink-3)}

/* ---------- misc ---------- */
.divider{height:1px;background:var(--line);border:none;margin:0}
.badge-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:16px}
.stat{font-family:var(--font-mono);font-weight:700;color:var(--accent-d)}
.hero-blob{position:absolute;border-radius:50%;filter:blur(60px);opacity:.5;pointer-events:none;z-index:0}

/* ---------- スマホ最適化 ---------- */
@media(max-width:600px){
  /* 文字サイズウィジェットをコンパクトに（ラベル非表示） */
  [data-fontsize]{padding:5px 9px !important;gap:5px !important}
  [data-fontsize] > span:first-child{display:none !important}
  [data-fontsize] button{padding:5px 9px !important}
  /* CTA帯・ホワイトペーパーの余白を確保＆長文の折り返し */
  .cta-band{padding:28px 20px}
  .cta-band p,.cta-band h2,.lead,.prose p{overflow-wrap:anywhere;word-break:normal}
  /* mockバッジが端に寄りすぎないように */
  .mock-badge{right:0;font-size:13px;padding:10px 16px}
}

/* ---------- responsive ---------- */
@media(max-width:880px){
  .site-footer .foot-grid{grid-template-columns:1fr 1fr}
  .grid-3{grid-template-columns:1fr 1fr}
}
@media(max-width:720px){
  .site-nav{display:none}
  .site-nav.open{display:flex;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:var(--bg);border-bottom:1px solid var(--line);padding:12px 16px;gap:2px}
  .site-nav.open a{width:100%;padding:12px 14px}
  .nav-toggle{display:inline-grid;place-items:center;margin-left:auto;width:42px;height:42px;border:1px solid var(--line-strong);border-radius:11px;background:#fff;cursor:pointer;font-size:19px}
  .grid-2,.grid-3{grid-template-columns:1fr}
  .site-footer .foot-grid{grid-template-columns:1fr 1fr;gap:24px}
  .cta-band .btn-row{flex-direction:column}
  .cta-band .btn{width:100%}
}
@media(max-width:520px){
  .site-footer .foot-grid{grid-template-columns:1fr}
}