:root{
  --teal:#0284c7; --teal-dark:#0369a1; --teal-soft:#f0f9ff;
  --ink:#1f2937; --muted:#6b7280; --line:#e5e7eb; --bg:#f8fafc;
  --card:#ffffff; --radius:14px;
  font-size:16px;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans SC",system-ui,-apple-system,sans-serif;color:var(--ink);background:var(--bg);line-height:1.75}
a{color:inherit;text-decoration:none}
img{max-width:100%;height:auto}
.wrap{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:9px;font-weight:700;font-size:1.15rem;color:var(--teal-dark)}
.nav{display:flex;gap:4px;overflow-x:auto}
.nav a{padding:7px 13px;border-radius:999px;font-size:.92rem;color:var(--muted);white-space:nowrap}
.nav a:hover{background:var(--teal-soft);color:var(--teal-dark)}

/* hero */
.hero{background:linear-gradient(135deg,#f0f9ff 0%,#e0f2fe 60%,#f8fafc 100%);padding:64px 0 44px;text-align:center;border-bottom:1px solid var(--line)}
.hero h1{font-size:2.3rem;letter-spacing:.06em;color:var(--teal-dark)}
.hero-sub{margin-top:10px;color:var(--muted);font-size:1rem}
.search-box{display:flex;align-items:center;gap:10px;max-width:520px;margin:26px auto 0;background:#fff;border:1px solid var(--line);border-radius:999px;padding:11px 20px;color:var(--muted);box-shadow:0 1px 3px rgba(2,132,199,.06)}
.search-box:focus-within{border-color:var(--teal);box-shadow:0 0 0 3px rgba(2,132,199,.12)}
.search-box input{flex:1;border:0;outline:0;font-size:1rem;background:transparent;color:var(--ink)}

/* chips */
.chips{display:flex;gap:10px;flex-wrap:wrap;margin:34px 0 22px}
.chip{padding:7px 18px;border-radius:999px;border:1px solid var(--line);background:#fff;font-size:.92rem;color:var(--muted);cursor:pointer;transition:.15s}
.chip:hover{border-color:var(--teal);color:var(--teal-dark)}
.chip.active{background:var(--teal);border-color:var(--teal);color:#fff}

/* grid & card */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:22px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:24px 24px 20px;display:flex;flex-direction:column;gap:10px;transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:0 8px 24px rgba(2,132,199,.10);border-color:#bae6fd}
.badge{align-self:flex-start;font-size:.78rem;padding:3px 11px;border-radius:999px;background:var(--teal-soft);color:var(--teal-dark);font-weight:600}
.card h2{font-size:1.12rem;line-height:1.5}
.card h2 a:hover{color:var(--teal-dark)}
.card p{font-size:.92rem;color:var(--muted);display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card .meta{margin-top:auto;font-size:.82rem;color:#9ca3af;padding-top:8px}
.empty{text-align:center;color:var(--muted);padding:60px 0}

/* article */
.article{max-width:780px;margin:0 auto;padding:36px 20px 10px}
.crumbs{font-size:.86rem;color:var(--muted);margin-bottom:18px}
.crumbs a{color:var(--teal-dark)}
.crumbs a:hover{text-decoration:underline}
.article h1{font-size:1.7rem;line-height:1.45;margin-bottom:12px}
.article .meta{color:#9ca3af;font-size:.88rem;margin-bottom:28px;padding-bottom:20px;border-bottom:1px solid var(--line)}
.article-body h2{font-size:1.25rem;margin:34px 0 14px;padding-left:12px;border-left:4px solid var(--teal);color:var(--teal-dark)}
.article-body p{margin:0 0 16px}
.article-body ul,.article-body ol{margin:0 0 16px 22px}
.article-body li{margin-bottom:8px}
.article-body blockquote{margin:20px 0;padding:14px 18px;background:var(--teal-soft);border-left:4px solid var(--teal);border-radius:0 10px 10px 0;color:var(--teal-dark);font-size:.95rem}
.related{max-width:780px;margin:46px auto 0;padding:0 20px 20px}
.related h3{font-size:1.05rem;margin-bottom:14px;color:var(--teal-dark)}
.related a{display:block;padding:12px 16px;background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:10px;font-size:.94rem}
.related a:hover{border-color:var(--teal)}
.related a span{color:#9ca3af;font-size:.8rem;margin-right:10px}

/* prev / next navigation */
.post-nav{display:flex;gap:14px;margin-top:36px}
.post-nav a,.post-nav .nav-none{flex:1;min-width:0;background:#fff;border:1px solid var(--line);border-radius:10px;padding:12px 16px;font-size:.94rem;color:var(--ink)}
.post-nav a:hover{border-color:var(--teal);color:var(--teal-dark)}
.post-nav a span,.post-nav .nav-none{display:block}
.post-nav a span{display:block;color:#9ca3af;font-size:.8rem;margin-bottom:4px;font-weight:600}
.post-nav a{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.post-nav .nav-next{text-align:right}
.post-nav .nav-none{color:#9ca3af;font-size:.9rem}

/* footer */
.site-footer{margin-top:60px;border-top:1px solid var(--line);background:#fff;padding:28px 0;text-align:center;font-size:.9rem;color:var(--muted)}
.site-footer .muted{font-size:.8rem;color:#9ca3af;margin-top:4px}
.site-footer .beian{margin-top:8px;font-size:.8rem}
.site-footer .beian a{color:#9ca3af}
.site-footer .beian a:hover{color:#64748b}

@media (max-width:640px){
  .hero h1{font-size:1.8rem}
  .hero{padding:44px 0 32px}
  .article h1{font-size:1.4rem}
  .grid{grid-template-columns:1fr}
}