:root{
  --jk-bg:#ffffff;
  --jk-text:#0b1220;
  --jk-muted:#5b667a;
  --jk-card:#f4f7f9;
  --jk-line:#e6eaf0;
  --jk-accent:#003366;
  --jk-radius:18px;
  --jk-max:1100px;
  --jk-shadow: 0 10px 30px rgba(11,18,32,.08);
  --jk-font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family:var(--jk-font);color:var(--jk-text);background:var(--jk-bg);line-height:1.55}
a{color:var(--jk-accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{max-width:var(--jk-max);margin:0 auto;padding:0 18px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.85);backdrop-filter:blur(10px);border-bottom:1px solid var(--jk-line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px 0}
.brand{display:flex;flex-direction:column;gap:2px}
.brand strong{font-size:16px;letter-spacing:.2px}
.brand span{font-size:12px;color:var(--jk-muted)}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:14px;flex-wrap:wrap}
.nav a{display:inline-block;padding:8px 10px;border-radius:12px}
.nav a:hover{background:var(--jk-card);text-decoration:none}
.nav .current-menu-item>a{background:var(--jk-card)}
.hero{padding:56px 0 20px}
.hero h1{font-size:clamp(30px,4vw,44px);margin:0 0 10px}
.hero p{color:var(--jk-muted);font-size:18px;margin:0 0 18px;max-width:70ch}
.btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:14px;padding:12px 16px;border:1px solid var(--jk-line);background:#fff;color:var(--jk-text)}
.btn.primary{background:var(--jk-accent);border-color:var(--jk-accent);color:#fff}
.btn:hover{text-decoration:none;filter:brightness(.98)}
.grid{display:grid;gap:16px}
.grid.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width:900px){.grid.cols-3,.grid.cols-2{grid-template-columns:1fr}}
.card{background:var(--jk-card);border:1px solid var(--jk-line);border-radius:var(--jk-radius);padding:18px;box-shadow:var(--jk-shadow)}
.card h3{margin:0 0 8px}
.card p{margin:0;color:var(--jk-muted)}
.section{padding:18px 0 34px}
.section h2{margin:0 0 14px;font-size:22px}
.meta{color:var(--jk-muted);font-size:13px}
.post-card{background:#fff;border:1px solid var(--jk-line);border-radius:var(--jk-radius);padding:16px}
.post-card h3{margin:0 0 6px;font-size:18px}
.post-card p{margin:0;color:var(--jk-muted)}
.post-card .thumb{width:100%;height:180px;object-fit:cover;border-radius:14px;border:1px solid var(--jk-line);margin-bottom:12px;background:var(--jk-card)}
.site-footer{border-top:1px solid var(--jk-line);padding:26px 0;color:var(--jk-muted);font-size:13px}
.content{padding:22px 0 42px}
.content img{max-width:100%;height:auto;border-radius:14px;border:1px solid var(--jk-line)}
.notice{background:#fff7e6;border:1px solid #ffe0a3;color:#6b4a00;padding:12px 14px;border-radius:14px}
details.jk-details summary{font-weight:600;cursor:pointer;padding:10px 12px;background:#fff;border:1px solid var(--jk-line);border-radius:14px;display:inline-block}
details.jk-details[open] summary{margin-bottom:12px}