*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--color-primary:#1a56db;--color-primary-dark:#1440a8;--color-primary-light:#e8f0fe;--color-accent:#0ea5e9;--color-text:#1e293b;--color-text-light:#64748b;--color-bg:#f8fafc;--color-white:#fff;--color-border:#e2e8f0;--color-card:#fff;--radius:8px;--shadow:0 1px 3px rgba(0,0,0,.08),0 1px 2px rgba(0,0,0,.06);--shadow-lg:0 4px 12px rgba(0,0,0,.1);--max-w:1140px;--font-sans:"Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic","Meiryo",sans-serif}
html{font-size:16px;scroll-behavior:smooth}
body{font-family:var(--font-sans);color:var(--color-text);background:var(--color-bg);line-height:1.8;-webkit-font-smoothing:antialiased}
a{color:var(--color-primary);text-decoration:none;transition:color .2s}
a:hover{color:var(--color-primary-dark)}
img{max-width:100%;height:auto}
.container{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* Header */
.site-header{background:var(--color-white);border-bottom:1px solid var(--color-border);position:sticky;top:0;z-index:100}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:var(--max-w);margin:0 auto}
.site-logo{font-size:1.25rem;font-weight:700;color:var(--color-primary);display:flex;align-items:center;gap:8px}
.site-logo svg{width:28px;height:28px}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:var(--color-text);margin:5px 0;transition:.3s}
.global-nav ul{display:flex;list-style:none;gap:4px}
.global-nav a{display:block;padding:8px 14px;font-size:.875rem;font-weight:500;border-radius:var(--radius);color:var(--color-text-light);transition:.2s}
.global-nav a:hover{background:var(--color-primary-light);color:var(--color-primary)}

/* Hero */
.hero{background:linear-gradient(135deg,var(--color-primary) 0%,#0ea5e9 100%);color:var(--color-white);padding:60px 0 50px;text-align:center}
.hero h1{font-size:2rem;font-weight:700;margin-bottom:12px;line-height:1.4}
.hero p{font-size:1.05rem;opacity:.92;max-width:640px;margin:0 auto}

/* Breadcrumb */
.breadcrumb{padding:14px 0;font-size:.82rem;color:var(--color-text-light)}
.breadcrumb ol{display:flex;list-style:none;gap:6px;flex-wrap:wrap}
.breadcrumb li::after{content:"›";margin-left:6px;color:var(--color-text-light)}
.breadcrumb li:last-child::after{display:none}
.breadcrumb a{color:var(--color-text-light)}
.breadcrumb a:hover{color:var(--color-primary)}

/* Content Layout */
.content-wrap{display:grid;grid-template-columns:1fr 300px;gap:36px;padding:36px 0}
.main-content{min-width:0}

/* Article */
.article-header{margin-bottom:32px}
.article-header h1{font-size:1.65rem;line-height:1.55;font-weight:700;margin-bottom:14px}
.article-meta{display:flex;flex-wrap:wrap;gap:12px;font-size:.82rem;color:var(--color-text-light);margin-bottom:16px}
.article-meta time{display:inline-flex;align-items:center;gap:4px}
.category-badge{display:inline-block;background:var(--color-primary-light);color:var(--color-primary);font-size:.78rem;font-weight:600;padding:3px 10px;border-radius:20px}
.article-body{font-size:.95rem;line-height:1.9}
.article-body h2{font-size:1.35rem;font-weight:700;margin:40px 0 18px;padding-bottom:10px;border-bottom:2px solid var(--color-primary-light)}
.article-body h3{font-size:1.1rem;font-weight:700;margin:28px 0 14px}
.article-body h4{font-size:1rem;font-weight:700;margin:22px 0 10px}
.article-body p{margin-bottom:18px}
.article-body ul,.article-body ol{margin-bottom:18px;padding-left:1.6em}
.article-body li{margin-bottom:6px}
.article-body table{width:100%;border-collapse:collapse;margin-bottom:20px;font-size:.9rem}
.article-body th,.article-body td{border:1px solid var(--color-border);padding:10px 14px;text-align:left}
.article-body th{background:var(--color-primary-light);font-weight:600}
.article-body blockquote{border-left:4px solid var(--color-accent);padding:14px 18px;margin:20px 0;background:var(--color-primary-light);border-radius:0 var(--radius) var(--radius) 0;font-size:.92rem}
.article-body hr{border:none;border-top:1px solid var(--color-border);margin:32px 0}
.article-body img{border-radius:var(--radius);margin:16px 0}
.article-body .toc{background:var(--color-primary-light);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px 24px;margin-bottom:28px}
.article-body .toc h2,.article-body .toc h3{margin:0 0 10px;font-size:1rem;border:none;padding:0}
.article-body .toc ul{margin:0;padding-left:1.4em}
.article-body .toc li{margin-bottom:4px;font-size:.9rem}

/* Related articles */
.related-posts{margin-top:48px;padding-top:28px;border-top:2px solid var(--color-border)}
.related-posts h2{font-size:1.15rem;font-weight:700;margin-bottom:18px}
.related-list{display:grid;gap:14px}
.related-item{display:block;padding:14px 16px;background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius);transition:.2s}
.related-item:hover{border-color:var(--color-primary);box-shadow:var(--shadow)}
.related-item .related-title{font-size:.9rem;font-weight:600;color:var(--color-text);line-height:1.5}

/* Sidebar */
.sidebar{position:sticky;top:80px;align-self:start}
.sidebar-section{background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius);padding:20px;margin-bottom:20px}
.sidebar-section h3{font-size:.92rem;font-weight:700;margin-bottom:14px;padding-bottom:8px;border-bottom:2px solid var(--color-primary)}
.sidebar-section ul{list-style:none}
.sidebar-section li{margin-bottom:8px}
.sidebar-section a{font-size:.84rem;color:var(--color-text);display:block;padding:6px 8px;border-radius:4px;transition:.15s}
.sidebar-section a:hover{background:var(--color-primary-light);color:var(--color-primary)}

/* Index page cards */
.cards-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:22px}
.card{background:var(--color-white);border:1px solid var(--color-border);border-radius:var(--radius);overflow:hidden;transition:.25s}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}
.card-body{padding:18px}
.card-body h3{font-size:1rem;font-weight:700;line-height:1.5;margin-bottom:8px}
.card-body h3 a{color:var(--color-text)}
.card-body p{font-size:.85rem;color:var(--color-text-light);line-height:1.6;margin-bottom:10px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-meta{font-size:.78rem;color:var(--color-text-light)}

/* Category page */
.category-header{margin-bottom:32px}
.category-header h1{font-size:1.5rem;font-weight:700}

/* Footer */
.site-footer{background:var(--color-text);color:rgba(255,255,255,.75);margin-top:60px;padding:40px 0 20px}
.footer-inner{max-width:var(--max-w);margin:0 auto;padding:0 20px}
.footer-nav{display:flex;flex-wrap:wrap;gap:12px 24px;margin-bottom:24px}
.footer-nav a{font-size:.82rem;color:rgba(255,255,255,.65);transition:.2s}
.footer-nav a:hover{color:#fff}
.footer-copy{font-size:.78rem;text-align:center;border-top:1px solid rgba(255,255,255,.1);padding-top:16px}

/* Pagination */
.pagination{display:flex;justify-content:center;gap:8px;margin-top:32px}

/* Responsive */
@media(max-width:768px){
  .content-wrap{grid-template-columns:1fr}
  .sidebar{position:static;order:2}
  .global-nav{display:none;position:fixed;top:60px;left:0;right:0;bottom:0;background:var(--color-white);z-index:99;padding:20px;overflow-y:auto}
  .global-nav.is-open{display:block}
  .global-nav ul{flex-direction:column;gap:0}
  .global-nav a{padding:14px 0;border-bottom:1px solid var(--color-border);font-size:1rem}
  .nav-toggle{display:block}
  .hero{padding:36px 0 30px}
  .hero h1{font-size:1.4rem}
  .article-header h1{font-size:1.25rem}
  .article-body h2{font-size:1.15rem}
  .cards-grid{grid-template-columns:1fr}
  .footer-nav{flex-direction:column;gap:8px}
}
@media(min-width:769px) and (max-width:1024px){
  .content-wrap{grid-template-columns:1fr 260px;gap:24px}
}