:root{
  --bg:#f7fafc; --card:#ffffff; --fg:#0f172a; --muted:#475569;
  --line:#e2e8f0; --brand:#0ea5b8; --brand2:#38bdf8; --chip:#0ea5b81a;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--fg);
  font:16px/1.6 system-ui,-apple-system,Segoe UI,Inter,Roboto,Helvetica,Arial,sans-serif}
a{color:#0b81c7;text-decoration:none} a:hover{text-decoration:underline}

.layout{display:grid;grid-template-columns:280px 1fr;min-height:100vh}
.sidebar{position:sticky;top:0;align-self:start;height:100vh;overflow:auto;background:#eef5f9;border-right:1px solid var(--line)}
.brand{padding:18px;border-bottom:1px solid var(--line)}
.brand h1{font-size:18px;line-height:1.2;margin:0}
.brand p{margin:8px 0 0;color:var(--muted);font-size:13px}

.nav{padding:14px}
.nav h3{margin:14px 0 6px;font-size:13px;color:#0b5a79;text-transform:uppercase;letter-spacing:.04em}
.nav ul{list-style:none;margin:0;padding:0}
.nav li{margin:8px 0}
.nav a{display:block;padding:8px 10px;border-radius:8px;background:#ffffffaa;border:1px solid var(--line)}
.nav a:hover{background:#fff}

.main{min-width:0}
.content{max-width:1100px;margin:0 auto;padding:24px}

.notice{background:linear-gradient(180deg,#e6f7fb,#eaf5ff);border:1px solid #c8e8f6;padding:12px 14px;border-radius:10px;margin:0 0 16px}
.card{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px;margin:0 0 18px;box-shadow:0 2px 10px rgba(2,8,23,.04)}
.meta{color:var(--muted);font-size:13px;margin:-4px 0 10px}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 6px}
.chip{font-size:12px;border:1px solid var(--line);background:var(--chip);padding:4px 8px;border-radius:999px}
.grid{display:grid;grid-template-columns:2fr 1fr;gap:18px}

figure{margin:0 0 12px;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#fff}
figure img{width:100%;display:block}
figcaption{font-size:12px;color:var(--muted);padding:8px;border-top:1px solid var(--line)}

.btn{display:inline-block;padding:11px 16px;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--brand2));color:#03202a;border:1px solid #8bd8ff;font-weight:800}

footer{margin:24px 0;color:var(--muted);font-size:13px}

@media (max-width:980px){
  .layout{grid-template-columns:1fr}
  .sidebar{position:static;height:auto}
  .grid{grid-template-columns:1fr}
}