:root{--red:#C8102E;--red-dark:#A30D26;--red-light:#FDF2F4;--ink:#1A1A1A;--muted:#6B7280;--border:#ECECEC}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:#fff;line-height:1.75}
a{color:inherit;text-decoration:none}
.container{max-width:1080px;margin:0 auto;padding:0 20px}

/* header */
.header{background:#fff;border-bottom:1px solid var(--border);position:sticky;top:0;z-index:50}
.header .container{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:700}
.logo-mark{height:36px;width:auto;display:block}
.logo .tag{font-size:11px;color:var(--red);border:1px solid var(--red);border-radius:4px;padding:1px 6px;font-weight:500}
.nav{display:flex;gap:22px;font-size:14px}
.nav a{color:var(--muted);padding:4px 2px}
.nav a.on,.nav a:hover{color:var(--red);border-bottom:2px solid var(--red)}

/* hero */
.hero{background:linear-gradient(180deg,var(--red-light),#fff);padding:56px 0 40px}
.hero h1{font-size:30px;letter-spacing:1px}
.hero h1 em{font-style:normal;color:var(--red)}
.hero p{color:var(--muted);margin-top:10px;font-size:15px;max-width:640px}
.hero .links{margin-top:18px;font-size:14px}
.hero .links a{color:var(--red);font-weight:600;margin-right:18px}

/* sections */
.section{padding:44px 0 10px}
.section h2{font-size:20px;display:flex;align-items:center;gap:10px}
.section h2::before{content:"";width:4px;height:20px;background:var(--red);border-radius:2px;display:inline-block}
.section .sub{color:var(--muted);font-size:13px;margin:4px 0 18px 14px}

/* cat chips */
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:14px 0 8px}
.chips a{font-size:13px;border:1px solid var(--border);border-radius:20px;padding:5px 14px;color:var(--muted);transition:.15s}
.chips a:hover,.chips a.on{border-color:var(--red);color:var(--red);background:var(--red-light)}

/* article cards */
.grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:14px}
.card{border:1px solid var(--border);border-radius:14px;padding:22px 24px;background:#fff;transition:.2s;display:block}
.card:hover{border-color:var(--red);box-shadow:0 6px 18px rgba(200,16,46,.08)}
.card .meta{font-size:12px;color:var(--muted);display:flex;gap:10px;margin-bottom:8px}
.card .cat{color:var(--red);font-weight:600}
.card h3{font-size:16px;line-height:1.5}
.card p{font-size:13px;color:var(--muted);margin-top:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* article page */
.article{max-width:800px;margin:0 auto;padding:40px 20px 30px}
.article .crumb{font-size:13px;color:var(--muted);margin-bottom:16px}
.article .crumb a{color:var(--red)}
.article h1{font-size:26px;line-height:1.45;margin-bottom:12px}
.article .meta{font-size:13px;color:var(--muted);padding-bottom:20px;border-bottom:1px solid var(--border);display:flex;gap:16px;flex-wrap:wrap}
.article .body{padding-top:24px;font-size:15.5px}
.article .body h2{font-size:19px;margin:30px 0 12px;padding-left:12px;border-left:4px solid var(--red)}
.article .body h3{font-size:16px;margin:22px 0 10px}
.article .body p{margin:10px 0}
.article .body ul,.article .body ol{margin:10px 0 10px 22px}
.article .body li{margin:6px 0}
.article .body table{width:100%;border-collapse:collapse;margin:14px 0;font-size:14px}
.article .body th,.article .body td{border:1px solid var(--border);padding:9px 12px;text-align:left}
.article .body th{background:var(--red-light);color:var(--red-dark)}
.article .body .tip{background:var(--red-light);border-radius:10px;padding:14px 18px;margin:16px 0;font-size:14px}
.article .body .tip b{color:var(--red)}
.article .body .src{font-size:13px;color:var(--muted);margin-top:26px;padding-top:14px;border-top:1px dashed var(--border)}

/* cta light ad */
.cta{background:linear-gradient(135deg,var(--red),var(--red-dark));border-radius:14px;color:#fff;padding:26px 30px;margin:34px 0 10px}
.cta h4{font-size:17px;margin-bottom:6px}
.cta p{font-size:13.5px;opacity:.92}
.cta .btns{margin-top:14px;display:flex;gap:12px;flex-wrap:wrap}
.cta .btns a{background:#fff;color:var(--red);font-weight:700;font-size:13.5px;padding:9px 20px;border-radius:8px}
.cta .btns a.ghost{background:transparent;color:#fff;border:1.5px solid rgba(255,255,255,.7)}

/* related */
.related{margin:26px 0 10px}
.related h4{font-size:15px;margin-bottom:10px}
.related a{display:block;font-size:14px;color:var(--muted);padding:7px 0;border-bottom:1px dashed var(--border)}
.related a:hover{color:var(--red)}

/* footer */
.footer{background:#1A1A1A;color:#B0B0B0;padding:40px 0 30px;font-size:13px;text-align:center;margin-top:50px}
.footer .flinks{margin-bottom:10px}
.footer .flinks a{color:#DDDDDD;margin:0 10px}
.footer .addr{margin-bottom:8px}

@media (max-width:720px){
  .grid{grid-template-columns:1fr}
  .nav{display:none}
  .hero h1{font-size:23px}
  .article h1{font-size:21px}
}