*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root{
  --sky:#2D9CDB; --sky-light:#56CCF2; --sky-pale:#E8F6FD; --sky-dark:#1A7AB5;
  --teal:#27AE8F; --navy:#1A2E44; --gray:#6B7280; --gray-light:#F3F4F6;
  --border:#E5E7EB; --white:#FFFFFF;
  --font:'Helvetica Neue','Hiragino Sans','Meiryo',Arial,sans-serif;
}
html{scroll-behavior:smooth;}
body{font-family:var(--font);color:var(--navy);background:var(--white);line-height:1.85;}
a{text-decoration:none;color:inherit;}
.container{max-width:1080px;margin:0 auto;padding:0 40px;}
.tag{display:inline-block;font-size:.72rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;padding:4px 14px;border-radius:20px;background:var(--sky-pale);color:var(--sky);margin-bottom:16px;}
nav{position:fixed;top:0;width:100%;z-index:200;background:rgba(255,255,255,.97);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);height:68px;display:flex;align-items:center;}
.nav-inner{width:100%;max-width:1080px;margin:0 auto;padding:0 40px;display:flex;align-items:center;justify-content:space-between;}
.nav-logo{font-size:1.4rem;font-weight:900;color:var(--navy);letter-spacing:.05em;}
.nav-logo span{color:var(--sky);}
.nav-links{display:flex;gap:30px;list-style:none;}
.nav-links a{font-size:.85rem;color:var(--gray);transition:color .15s;}
.nav-links a:hover,.nav-links a.active{color:var(--sky);}
.nav-cta{background:var(--sky);color:var(--white);padding:10px 24px;border-radius:6px;font-size:.85rem;font-weight:700;transition:background .2s;}
.nav-cta:hover{background:var(--sky-dark);}
.col-hero{padding-top:68px;background:linear-gradient(160deg,#f0f9ff 0%,#e8f6fd 45%,#fff 100%);}
.col-hero-inner{max-width:1080px;margin:0 auto;padding:60px 40px 48px;}
.breadcrumb{font-size:.78rem;color:var(--gray);margin-bottom:20px;}
.breadcrumb a:hover{color:var(--sky);}
.breadcrumb span{color:var(--sky);}
.col-intro{font-size:.95rem;color:var(--gray);max-width:760px;line-height:1.95;margin-top:8px;}
.filters{display:flex;flex-wrap:wrap;gap:10px;margin:36px 0 0;}
.filter-btn{font-size:.8rem;font-weight:700;padding:7px 16px;border-radius:20px;border:1px solid var(--border);background:var(--white);color:var(--gray);cursor:pointer;transition:all .15s;}
.filter-btn:hover{border-color:var(--sky);color:var(--sky);}
.filter-btn.active{background:var(--sky);color:var(--white);border-color:var(--sky);}
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;padding:56px 0 100px;}
.post-card{display:flex;flex-direction:column;background:var(--white);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:transform .2s,box-shadow .2s;height:100%;}
.post-card:hover{transform:translateY(-5px);box-shadow:0 12px 36px rgba(45,156,219,.15);}
.post-card-top{height:6px;background:linear-gradient(90deg,var(--sky),var(--sky-light));}
.post-card-body{padding:26px 24px 24px;display:flex;flex-direction:column;flex:1;}
.post-meta{display:flex;gap:10px;align-items:center;margin-bottom:14px;flex-wrap:wrap;}
.post-cat{font-size:.7rem;font-weight:700;letter-spacing:.08em;color:var(--sky);background:var(--sky-pale);padding:3px 12px;border-radius:14px;}
.post-region{font-size:.7rem;color:var(--gray);}
.post-date{font-size:.7rem;color:var(--gray);margin-left:auto;}
.post-card h2{font-size:1.02rem;font-weight:800;line-height:1.5;color:var(--navy);margin-bottom:12px;}
.post-excerpt{font-size:.83rem;color:var(--gray);line-height:1.75;flex:1;}
.post-readmore{margin-top:18px;font-size:.82rem;font-weight:700;color:var(--sky);}
.article-wrap{max-width:760px;margin:0 auto;padding:0 40px;}
.article-head{padding:8px 0 0;}
.article-head h1{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:900;line-height:1.45;color:var(--navy);margin:8px 0 20px;}
.article-meta{display:flex;gap:14px;align-items:center;flex-wrap:wrap;font-size:.78rem;color:var(--gray);}
.summary-box{background:var(--sky-pale);border-left:4px solid var(--sky);border-radius:0 12px 12px 0;padding:24px 28px;margin:40px 0;}
.summary-box h3{font-size:.95rem;font-weight:800;color:var(--navy);margin-bottom:14px;}
.summary-box ul{list-style:none;}
.summary-box li{font-size:.9rem;color:var(--navy);padding:7px 0 7px 26px;position:relative;line-height:1.7;}
.summary-box li::before{content:'\2713';position:absolute;left:0;color:var(--sky);font-weight:900;}
.article-body{padding-bottom:8px;}
.article-body h2{font-size:1.15rem;font-weight:800;color:var(--navy);margin:36px 0 14px;padding-left:14px;border-left:4px solid var(--sky);}
.article-body p{font-size:.94rem;color:#374151;line-height:2.0;margin-bottom:20px;}
.source-box{margin:40px 0;padding:20px 24px;background:var(--gray-light);border-radius:12px;font-size:.85rem;}
.source-box .source-label{font-weight:700;color:var(--navy);margin-bottom:6px;display:block;}
.source-box a{color:var(--sky);word-break:break-all;}
.kw-row{margin:24px 0 8px;display:flex;flex-wrap:wrap;gap:8px;}
.kw-chip{font-size:.74rem;color:var(--gray);background:var(--white);border:1px solid var(--border);padding:4px 12px;border-radius:14px;}
.cta-band{background:var(--sky);border-radius:16px;padding:40px;text-align:center;color:var(--white);margin:48px 0;}
.cta-band h3{font-size:1.3rem;font-weight:900;margin-bottom:10px;}
.cta-band p{font-size:.92rem;opacity:.95;margin-bottom:22px;max-width:460px;margin-left:auto;margin-right:auto;}
.cta-btn{display:inline-block;background:var(--white);color:var(--sky);padding:13px 34px;border-radius:6px;font-weight:700;font-size:.92rem;transition:transform .15s;}
.cta-btn:hover{transform:translateY(-2px);}
.related{padding:8px 0 80px;}
.related h3{font-size:1.05rem;font-weight:800;margin-bottom:20px;color:var(--navy);}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;}
.related-card{border:1px solid var(--border);border-radius:12px;padding:18px 20px;transition:border-color .15s,box-shadow .15s;}
.related-card:hover{border-color:var(--sky);box-shadow:0 4px 16px rgba(45,156,219,.1);}
.related-card .post-cat{margin-bottom:8px;display:inline-block;}
.related-card h4{font-size:.88rem;font-weight:700;line-height:1.55;color:var(--navy);}
.back-link{display:inline-block;margin:0 0 8px;font-size:.84rem;color:var(--sky);font-weight:700;}
footer{background:var(--navy);padding:40px;display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;}
.footer-logo{font-size:1.2rem;font-weight:900;color:var(--white);}
.footer-logo span{color:var(--sky);}
.footer-links{display:flex;gap:24px;flex-wrap:wrap;}
.footer-links a{font-size:.8rem;color:rgba(255,255,255,.5);transition:color .15s;}
.footer-links a:hover{color:var(--sky);}
footer p{font-size:.78rem;color:rgba(255,255,255,.3);width:100%;text-align:center;}
@media (max-width:860px){
  .container,.col-hero-inner,.nav-inner{padding-left:20px;padding-right:20px;}
  .article-wrap{padding:0 20px;}
  .nav-links{display:none;}
  .post-grid{grid-template-columns:1fr;}
  .related-grid{grid-template-columns:1fr;}
  footer{flex-direction:column;align-items:flex-start;}
}