:root{
  --bg:#fbfbfd; --surface:#fff; --ink:#16161a; --muted:#6b6b76;
  --line:#e7e7ec; --accent:#5b4bff; --accent-soft:#eeecff; --good:#16a34a;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}

/* header */
header{border-bottom:1px solid var(--line);background:var(--surface);position:sticky;top:0;z-index:10}
.nav{display:flex;align-items:center;justify-content:space-between;height:62px}
.logo{font-weight:800;font-size:19px;letter-spacing:-.02em}
.logo span{color:var(--accent)}
.nav a.link{color:var(--muted);font-size:15px;margin-left:22px;font-weight:500}
.nav a.link:hover{color:var(--ink);text-decoration:none}

/* hero */
.hero{text-align:center;padding:74px 0 56px}
.hero h1{font-size:46px;line-height:1.1;letter-spacing:-.03em;font-weight:800;max-width:760px;margin:0 auto}
.hero p{color:var(--muted);font-size:19px;margin-top:18px;max-width:560px;margin-left:auto;margin-right:auto}
.badge{display:inline-block;background:var(--accent-soft);color:var(--accent);
  font-size:13px;font-weight:600;padding:5px 13px;border-radius:99px;margin-bottom:20px}

/* sections */
section{padding:30px 0}
h2{font-size:26px;letter-spacing:-.02em;margin-bottom:6px}
.sub{color:var(--muted);margin-bottom:22px}

/* grid */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
@media(max-width:760px){.grid{grid-template-columns:1fr}.hero h1{font-size:33px}}
.card{background:var(--surface);border:1px solid var(--line);border-radius:14px;
  padding:22px;transition:transform .12s,box-shadow .12s}
.card:hover{transform:translateY(-3px);box-shadow:0 12px 30px rgba(20,20,30,.08)}
.card .maker{font-size:13px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.04em}
.card h3{font-size:20px;margin:6px 0 8px;letter-spacing:-.01em}
.card p{font-size:14.5px;color:var(--muted)}
.card .tag{display:inline-block;font-size:12px;margin-top:14px;padding:3px 10px;
  border-radius:6px;background:#f0f0f4;color:var(--muted);font-weight:600}

/* fact box */
.fact{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:24px 0}
.fact .row{display:flex;border-bottom:1px solid var(--line);font-size:15px}
.fact .row:last-child{border-bottom:none}
.fact .k{width:200px;padding:13px 18px;color:var(--muted);font-weight:600;background:#fafafc}
.fact .v{padding:13px 18px;flex:1}

/* article */
.article{max-width:720px}
.article h1{font-size:38px;letter-spacing:-.03em;line-height:1.15}
.article .lede{font-size:18px;color:var(--muted);margin:14px 0 8px}
.article h2{margin-top:34px;font-size:23px}
.article p{margin-top:14px;font-size:16.5px}
.article ul{margin:14px 0 14px 22px}
.article li{margin-top:7px}

/* compare table */
.cmp{width:100%;border-collapse:collapse;margin:24px 0;background:var(--surface);
  border:1px solid var(--line);border-radius:14px;overflow:hidden}
.cmp th,.cmp td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);font-size:15px}
.cmp th{background:#fafafc;font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.cmp tr:last-child td{border-bottom:none}
.cmp td:first-child{font-weight:600;color:var(--muted);width:200px}

/* cta + ad slot */
.cta{display:inline-block;background:var(--accent);color:#fff;font-weight:600;
  padding:11px 22px;border-radius:9px;margin-top:8px}
.cta:hover{text-decoration:none;opacity:.92}
.adslot{border:1px dashed var(--line);border-radius:12px;padding:26px;text-align:center;
  color:#b8b8c2;font-size:13px;margin:30px 0;background:var(--surface)}

/* footer */
footer{border-top:1px solid var(--line);margin-top:50px;padding:34px 0;background:var(--surface)}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:14px}
.upd{color:var(--good);font-weight:600;font-size:13px}

/* ── deep-content components (GEO/SEO) ── */

/* breadcrumb */
.crumb{font-size:13px;color:var(--muted);margin:20px 0 2px}
.crumb a{color:var(--muted)}
.crumb a:hover{color:var(--accent)}
.crumb span{margin:0 6px;color:#c4c4cc}

/* direct-answer block */
.answer{background:var(--accent-soft);border:1px solid #ddd9ff;border-left:4px solid var(--accent);
  border-radius:10px;padding:15px 20px;margin:20px 0;font-size:16.5px}

/* takeaway box */
.takeaway{background:#f0fdf4;border:1px solid #bbf7d0;border-radius:10px;padding:15px 20px;margin:22px 0}
.takeaway h3{font-size:13px;text-transform:uppercase;letter-spacing:.05em;color:var(--good);margin-bottom:6px}
.takeaway p{margin-top:4px;font-size:15.5px}

/* table of contents */
.toc{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:22px 0}
.toc strong{font-size:13px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}
.toc ul{margin:8px 0 0 18px;columns:2;font-size:14.5px}
@media(max-width:600px){.toc ul{columns:1}}

/* faq */
.faq{margin-top:14px}
.faq details{border:1px solid var(--line);border-radius:10px;background:var(--surface);margin-top:10px;padding:0 18px}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;padding:14px 0;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";float:right;color:var(--accent);font-weight:700;font-size:20px;line-height:1.1}
.faq details[open] summary::after{content:"\2013"}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq details p{padding:12px 0 16px;font-size:15.5px;color:var(--muted);margin-top:0}

/* source citations */
.sources{font-size:13px;color:var(--muted);margin-top:34px;border-top:1px solid var(--line);padding-top:14px}
.sources a{color:var(--muted)}
.sources li{margin-top:5px}

/* numeric callout strip */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
@media(max-width:600px){.stats{grid-template-columns:1fr}}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:16px 18px}
.stat .n{font-size:26px;font-weight:800;letter-spacing:-.02em;color:var(--accent)}
.stat .l{font-size:13px;color:var(--muted);margin-top:3px}

/* author/byline */
.byline{font-size:13.5px;color:var(--muted);margin-top:8px}
.byline b{color:var(--ink)}

/* coming-soon card */
.card.soon{opacity:.55;pointer-events:none}
.card .tag.soon-tag{background:#fff4e0;color:#b97400}