:root {--bg:#111827;--surface:#1f2937;--ink:#e5e7eb;--muted:#9ca3af;--line:#374151;--brand:#3b82f6;--brand-deep:#60a5fa;--accent:#38bdf8;--nav-hover:#1e3a5f;--lead-bg:#0b1220;--topbar:linear-gradient(90deg,#020617,#1e3a8a 50%,#2563eb);--footer:#020617;--shadow:0 14px 32px rgba(0,0,0,.35);--radius:16px;--max:1100px;--font:"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;--bg-layers:radial-gradient(900px 400px at 10% 0%,rgba(59,130,246,.22),transparent 55%),radial-gradient(700px 300px at 100% 10%,rgba(56,189,248,.12),transparent 50%);}
*{box-sizing:border-box}html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--ink);line-height:1.75;background:var(--bg-layers),var(--bg)}
a{color:var(--brand);text-decoration:none}a:hover{color:var(--brand-deep);text-decoration:underline}
img{max-width:100%;height:auto;display:block}.container{width:min(100% - 2rem,var(--max));margin-inline:auto}
.skip{position:absolute;left:-999px;top:0;background:#000;color:#fff;padding:.5rem 1rem;z-index:1000}.skip:focus{left:1rem;top:1rem}
.topbar{background:var(--topbar);color:#f1f5f9;font-size:.9rem;padding:.55rem 0}
.topbar .container{display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap}.topbar strong{color:#fff}
.site-header{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);background:rgba(255,255,255,.94);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;justify-content:space-between;min-height:72px;gap:1rem}
.brand{display:flex;align-items:center;gap:.75rem;color:inherit;text-decoration:none}
.brand img{width:42px;height:42px;border-radius:10px;object-fit:cover}
.brand-text{display:flex;flex-direction:column;line-height:1.2}.brand-text b{font-size:1.05rem;color:var(--brand-deep)}.brand-text span{font-size:.78rem;color:var(--muted)}
.nav{display:flex;align-items:center;gap:.35rem}
.nav a{color:var(--ink);padding:.45rem .7rem;border-radius:10px;font-size:.92rem;text-decoration:none}
.nav a:hover,.nav a.active{background:var(--nav-hover);color:var(--brand-deep)}
.nav .btn{background:var(--brand);color:#fff!important;padding:.5rem .95rem;margin-left:.25rem}.nav .btn:hover{background:var(--brand-deep)}
.menu-toggle{display:none;border:1px solid var(--line);background:#fff;border-radius:10px;width:44px;height:44px;cursor:pointer;align-items:center;justify-content:center;flex-direction:column;gap:5px}
.menu-toggle span{width:18px;height:2px;background:var(--ink);display:block}
.hero{padding:2rem 0 1rem}
.btn-primary,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;padding:.72rem 1.15rem;border-radius:12px;font-weight:600;text-decoration:none}
.btn-primary{background:var(--brand);color:#fff}.btn-primary:hover{background:var(--brand-deep);color:#fff;text-decoration:none}
.btn-ghost{border:1px solid var(--line);color:var(--brand-deep);background:#fff}.btn-ghost:hover{background:var(--nav-hover);text-decoration:none}
.ads-wrap{margin:1rem 0 1.4rem;padding:.6rem;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}
.article-wrap{background:#fff;border:1px solid var(--line);border-radius:18px;padding:1.4rem 1.4rem 1.9rem;box-shadow:var(--shadow);margin-bottom:2rem}
.article-wrap h2{margin:1.7rem 0 .75rem;font-size:1.32rem;color:var(--brand-deep);padding-bottom:.45rem;border-bottom:2px solid var(--line)}
.article-wrap h2:first-child{margin-top:.15rem}.article-wrap h3{margin:1.15rem 0 .5rem;font-size:1.06rem}
.article-wrap p{margin:0 0 .9rem;color:#2a3148}.article-wrap ul,.article-wrap ol{margin:0 0 1rem;padding-left:1.2rem;color:#2a3148}.article-wrap li{margin-bottom:.35rem}
.lead{font-size:1.04rem;background:var(--lead-bg);border:1px solid var(--line);border-radius:12px;padding:1rem 1.1rem}
.grid-2,.grid-3,.grid-shots,.grid-partners{display:grid;gap:1rem;margin:1rem 0 1.2rem}
.grid-2{grid-template-columns:1fr 1fr}.grid-3{grid-template-columns:repeat(3,1fr)}.grid-shots{grid-template-columns:repeat(3,1fr)}.grid-partners{grid-template-columns:repeat(4,1fr)}
.feature,.shot,.partner,.faq-item,.note{background:var(--lead-bg);border:1px solid var(--line);border-radius:14px;padding:.95rem}
.feature h3{margin:0 0 .4rem}.feature p{margin:0;font-size:.95rem}
.shot img,.partner img{width:100%;border-radius:10px;background:#fff}.shot img{aspect-ratio:16/10;object-fit:cover}
.shot figcaption,.partner figcaption{margin-top:.45rem;font-size:.86rem;color:var(--muted);text-align:center}
.partner img{height:72px;object-fit:contain;padding:.4rem}
.outlinks{display:flex;flex-wrap:wrap;gap:.6rem;margin:1rem 0}
.outlinks a{background:#fff;border:1px solid var(--line);border-radius:12px;padding:.45rem .9rem;color:var(--brand-deep);font-weight:600;text-decoration:none}
.outlinks a:hover{background:var(--nav-hover)}
.faq-item{margin-bottom:.7rem}.faq-item summary{cursor:pointer;font-weight:700;color:var(--brand-deep);list-style:none}.faq-item summary::-webkit-details-marker{display:none}.faq-item p{margin:.55rem 0 0}
.page-hero{padding:1.8rem 0 1rem}.page-hero h1{margin:0 0 .5rem;font-size:clamp(1.45rem,2.4vw,2rem);color:var(--brand-deep)}.page-hero p{margin:0;color:var(--muted);max-width:46rem}
.simple-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:1.3rem;box-shadow:var(--shadow);margin-bottom:2rem}
.simple-card h2{margin-top:1.4rem;color:var(--brand-deep)}.simple-card h2:first-child{margin-top:0}
.error-page{min-height:70vh;display:grid;place-items:center;text-align:center;padding:2rem 1rem}
.error-box{background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:2rem 1.4rem;max-width:520px;box-shadow:var(--shadow)}
.error-box h1{margin:0 0 .6rem;font-size:2rem;color:var(--brand-deep)}
.site-footer{background:var(--footer);color:#d7daf5;padding:2rem 0 1.4rem;margin-top:1rem}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:1.2rem;margin-bottom:1.2rem}
.site-footer a{color:#cfd3f7}.site-footer h3{margin:0 0 .7rem;font-size:1rem;color:#fff}.site-footer ul{list-style:none;margin:0;padding:0}.site-footer li{margin-bottom:.35rem}
.copyright{border-top:1px solid rgba(255,255,255,.12);padding-top:1rem;font-size:.88rem;color:#9ea3c9}
.site-header{background:rgba(17,24,39,.92)}.brand-text b{color:#93c5fd}.nav a{color:#e5e7eb}.nav a:hover,.nav a.active{background:#1e3a5f;color:#93c5fd}
.menu-toggle{background:#111827;border-color:#374151}.menu-toggle span{background:#e5e7eb}
.hero-banner{background:linear-gradient(145deg,#0b1220,#1e3a8a);color:#f8fafc;border-radius:22px;padding:1.5rem;display:grid;grid-template-columns:1.15fr .85fr;gap:1.4rem;align-items:center;border:1px solid #334155}
.hero-banner h1{margin:0 0 .7rem;font-size:clamp(1.5rem,2.5vw,2.1rem)}.hero-banner p{margin:0 0 1rem;color:#cbd5e1}
.hero-actions{display:flex;flex-wrap:wrap;gap:.7rem}.hero-visual{border-radius:14px;overflow:hidden;border:1px solid #334155}
.hero-visual img{width:100%;aspect-ratio:4/3;object-fit:cover}
.az-chips{display:flex;flex-wrap:wrap;gap:.55rem;margin:0 0 1.4rem}
.az-chips a{display:inline-flex;align-items:center;justify-content:center;min-width:2.4rem;padding:.4rem .7rem;border-radius:999px;background:#0b1220;border:1px solid #334155;color:#93c5fd;font-weight:700;text-decoration:none;font-size:.9rem}
.az-chips a:hover{background:#1e3a5f;color:#fff}
.article-wrap{background:#1f2937;border-color:#374151}.article-wrap p,.article-wrap li{color:#d1d5db}.article-wrap h2{color:#93c5fd;border-bottom-color:#1e3a5f}
.feature,.shot,.partner,.faq-item,.note,.lead{background:#0b1220;border-color:#334155;color:#e5e7eb}
.ads-wrap{background:#1f2937}.outlinks a{background:#0b1220;border-color:#334155;color:#93c5fd}
.page-hero h1{color:#93c5fd}.simple-card{background:#1f2937;border-color:#374151;color:#e5e7eb}.simple-card h2{color:#93c5fd}
.error-box{background:#1f2937;border-color:#374151}.error-box h1{color:#93c5fd}
.entry-def{border-left:3px solid #3b82f6;padding-left:.9rem;margin:1rem 0}
@media (max-width:900px){.grid-3,.grid-2,.grid-shots,.grid-partners,.footer-grid,.hero-banner,.compare-row,.day-grid,.flow,.az-chips{grid-template-columns:1fr 1fr!important}}
@media (max-width:760px){.menu-toggle{display:inline-flex}.nav{display:none;position:absolute;left:1rem;right:1rem;top:72px;background:#fff;border:1px solid var(--line);border-radius:14px;flex-direction:column;align-items:stretch;padding:.6rem;box-shadow:var(--shadow)}.nav.open{display:flex}.nav a{border-radius:10px}.nav .btn{margin-left:0;text-align:center}.grid-3,.grid-2,.grid-shots,.grid-partners,.footer-grid,.hero-banner,.compare-row,.day-grid,.flow,.az-chips{grid-template-columns:1fr!important}.article-wrap,.simple-card{padding:1rem}}

/* official topbar - readable header strip */
.topbar{
  background:linear-gradient(90deg,#0b4ea2,#1260c4);
  color:#eef5ff;
  font-size:.86rem;
  padding:.45rem 0;
  line-height:1.4;
}
.topbar .container{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:.75rem;
  flex-wrap:nowrap;
}
.topbar-brand{font-weight:600;color:#fff;white-space:nowrap}
.topbar-domain{opacity:.92;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
@media (max-width:760px){
  .topbar{font-size:.8rem;padding:.4rem 0}
  .topbar .container{justify-content:center;gap:.35rem}
  .topbar-domain::before{content:"· ";opacity:.7}
}


/* ads: keep square, avoid oversized icons */
.ads-wrap.ads-header{
  margin:0;
  padding:.5rem .75rem .35rem;
  border:none;
  border-bottom:1px solid rgba(0,0,0,.06);
  border-radius:0;
  background:#fff;
}
.ads-wrap #ads{
  margin:4px 0 !important;
  gap:8px 12px !important;
}
.ads-wrap #ads img,.ads-header #ads img,#ads img{
  width:56px !important;
  height:56px !important;
  max-width:56px !important;
  max-height:56px !important;
  aspect-ratio:1/1 !important;
  object-fit:cover !important;
  object-position:center center;
  display:block;
  border-radius:12px;
}
.ads-wrap #ads figure{margin:0;width:56px}
.ads-wrap #ads > div{width:60px;flex:0 0 60px}
.ads-wrap #ads .caption,.ads-wrap #ads figcaption{
  font-size:11px;
  max-width:60px;
  margin-top:3px;
  color:#666;
}

/* full domain outlink chain */
.outlinks-chain{margin:1.2rem 0 1.6rem}
.outlinks-chain h2,.outlinks-chain h3{margin:0 0 .7rem;font-size:1.15rem}
.outlinks-chain p.note{margin:0 0 .8rem;color:#5b6b7f;font-size:.92rem}
.outlinks{
  display:flex;
  flex-wrap:wrap;
  gap:.55rem .65rem;
  margin:0;
}
.outlinks a{
  display:inline-flex;
  align-items:center;
  background:#fff;
  border:1px solid #c9daf0;
  border-radius:999px;
  padding:.4rem .85rem;
  color:#083a7a;
  text-decoration:none;
  font-weight:600;
  font-size:.88rem;
  line-height:1.3;
}
.outlinks a:hover{background:#eaf2fc;color:#0b4ea2;text-decoration:none}
.outlinks a .dom{
  margin-left:.35rem;
  font-weight:500;
  color:#5b6b7f;
  font-size:.8rem;
}
@media (max-width:760px){
  .outlinks a{font-size:.82rem;padding:.38rem .7rem}
  .outlinks a .dom{display:none}
}