/* Shared style for preserved article pages (old WordPress URLs kept for SEO). */
:root{--bg:#f7f8fc;--surface:#fff;--ink:#0d1330;--muted:#5a6380;--line:#e3e7f1;--brand:#2557e8;--grad:linear-gradient(135deg,#2557e8 0%,#14b8d4 100%);--tk-grad:linear-gradient(135deg,#ff7a4d 0%,#ff5c40 55%,#e8432a 100%);--note:#fff4f1;--note-line:#ffd6cc;--cta:#0b1230}
@media (prefers-color-scheme:dark){:root{--bg:#0b1230;--surface:#121b45;--ink:#eef1fb;--muted:#a7b0cf;--line:#26305e;--brand:#7ea1ff;--note:#2a1a22;--note-line:#5a2f2a;--cta:#121b45}}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.75 "Be Vietnam Pro",system-ui,sans-serif}
a{color:var(--brand)}img{max-width:100%;height:auto;display:block}
.wrap{max-width:760px;margin:0 auto;padding:0 16px}
header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--surface) 82%,transparent);backdrop-filter:saturate(1.6) blur(14px);border-bottom:1px solid var(--line)}
header .wrap{max-width:1120px;display:flex;align-items:center;justify-content:space-between;height:70px;gap:12px}
header img{height:34px;width:auto}
@media (prefers-color-scheme:dark){header img{filter:brightness(0) invert(1)}}
.btn{display:inline-block;padding:10px 18px;border-radius:999px;font-weight:600;text-decoration:none;color:#fff;background:var(--grad);white-space:nowrap}
.btn.tk{background:var(--tk-grad)}
.crumb{font-size:14px;color:var(--muted);margin:28px 0 8px}.crumb a{color:var(--muted)}
h1{font-size:clamp(28px,5vw,40px);line-height:1.25;margin:0 0 12px;letter-spacing:-.02em}
.lead{font-size:18px;color:var(--muted);margin:0 0 28px}
h2{font-size:clamp(22px,3.6vw,28px);line-height:1.3;margin:40px 0 12px}
article figure{margin:28px 0;background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden}
article figcaption{font-size:14px;color:#5a6380;padding:10px 16px}
article ul{padding-left:20px}article li{margin:8px 0}
.note{background:var(--note);border:1px solid var(--note-line);border-radius:16px;padding:18px 20px;margin:28px 0}
.cta{margin:44px 0 56px;padding:28px;border-radius:20px;background:var(--cta);color:#fff}
.cta h2{margin:0 0 8px;color:#fff}.cta p{color:#c6cbe0;margin:0 0 18px}.cta .row{display:flex;flex-wrap:wrap;gap:12px}
.cta .ghost{background:transparent;border:1px solid #3a4677}
footer{border-top:1px solid var(--line);background:var(--surface);font-size:14px;color:var(--muted)}
footer .wrap{max-width:1120px;padding:20px 16px;display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}
.related{margin:36px 0}.related ul{padding-left:20px;line-height:1.9}.related a{color:inherit;text-decoration:underline}