/* ============================================================
   比特指纹浏览器 aa —— 指纹矩阵 · 跨境账号隔离舱
   浅底 + 品牌金 #FFD700 + 中性深灰 #2B2B2B + 辅助蓝 #3370FF
   (色调贴近官方 bitbrowser.cn:金主 + 蓝辅 + 浅底 + 中性灰文字)
   骨架从零重写:顶部控制台工具条 + 指纹雷达 hero + 账号隔离舱
   ============================================================ */

:root{
  --bg:#F7F8FB;
  --card:#FFFFFF;
  --ink:#2B2B2B;
  --ink-2:#4A5563;
  --muted:#6B7686;
  --gold:#FFD700;
  --gold-deep:#E8B300;
  --gold-soft:#FFF4C2;
  --blue:#3370FF;
  --blue-deep:#1F55E0;
  --line:#E6EAF2;
  --line-soft:#EEF1F7;
  --navy:#2A3142;
  --navy-2:#232B3D;
  --green:#16A34A;
  --red:#DC2626;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 6px 24px rgba(43,43,43,.08);
  --shadow-lg:0 18px 48px rgba(43,43,43,.15);
  --mono:"SF Mono","JetBrains Mono",Consolas,"Courier New",monospace;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--bg);
  color:var(--ink);
  line-height:1.75;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none}

.wrap{max-width:1160px;margin:0 auto;padding:0 22px}
.wrap-wide{max-width:1280px;margin:0 auto;padding:0 22px}

/* ---------- 顶部控制台工具条 ---------- */
.topbar{
  position:sticky;top:0;z-index:60;
  background:rgba(255,255,255,.92);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.topbar::after{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,var(--gold),var(--gold-deep) 45%,var(--blue));
}
.topbar-in{display:flex;align-items:center;gap:28px;height:66px}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand-logo{height:34px;width:auto}
.brand-name{font-size:18px;font-weight:800;letter-spacing:.2px;color:var(--ink)}
.brand-name b{color:var(--blue)}
.nav{display:flex;align-items:center;gap:4px;flex:1}
.nav-link{
  position:relative;padding:9px 14px;font-size:15px;font-weight:600;
  color:var(--ink-2);border-radius:9px;transition:.18s;
}
.nav-link:hover{color:var(--blue);background:var(--line-soft)}
.nav-link.active{color:var(--blue)}
.nav-link.active::after{
  content:"";position:absolute;left:14px;right:14px;bottom:2px;height:3px;
  border-radius:2px;background:var(--gold);
}
.nav-cta{
  flex:none;display:inline-flex;align-items:center;gap:7px;
  background:linear-gradient(135deg,var(--gold),var(--gold-deep));
  color:#3A2C00;font-weight:800;font-size:15px;
  padding:10px 20px;border-radius:11px;
  box-shadow:0 6px 18px rgba(255,215,0,.38);
  transition:.2s;
}
.nav-cta:hover{transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,215,0,.5)}
.menu-btn{display:none;font-size:24px;color:var(--ink);padding:6px}

/* ---------- 首页 hero 分屏 ---------- */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(700px 340px at 82% 18%,rgba(255,215,0,.20),transparent 60%),
    radial-gradient(600px 320px at 10% 80%,rgba(51,112,255,.10),transparent 60%),
    var(--bg);
}
.hero-in{display:grid;grid-template-columns:1.02fr .98fr;gap:40px;align-items:center;padding:72px 0 66px}
.hero-copy{display:flex;flex-direction:column;min-width:0}
.hero-kicker{
  display:inline-flex;align-items:center;gap:8px;
  background:var(--gold-soft);color:#7A5B00;font-weight:700;font-size:13px;
  padding:6px 14px;border-radius:999px;border:1px solid rgba(255,215,0,.5);
}
.hero-kicker .dot{width:8px;height:8px;border-radius:50%;background:var(--gold-deep);box-shadow:0 0 0 3px rgba(212,175,55,.2)}
.hero-title{font-size:46px;line-height:1.22;font-weight:900;letter-spacing:-.5px;margin:18px 0 16px}
.hero-title .hl{
  background:linear-gradient(90deg,var(--blue),var(--gold-deep));
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-sub{font-size:17px;color:var(--muted);max-width:520px;margin-bottom:28px}
.hero-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:16px;
  padding:14px 26px;border-radius:12px;transition:.2s;
}
.btn-gold{
  background:linear-gradient(135deg,var(--gold),var(--gold-deep));
  color:#3A2C00;box-shadow:0 8px 22px rgba(255,215,0,.42);
}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(255,215,0,.54)}
.btn-ghost{
  background:var(--card);color:var(--ink);border:1.5px solid var(--line);
}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.hero-note{display:flex;align-items:center;gap:8px;margin-top:20px;font-size:13px;color:var(--muted)}
.hero-note .ico{width:18px;height:18px;flex:none;color:var(--green)}

/* 指纹雷达 */
.radar{position:relative;height:440px;display:flex;align-items:center;justify-content:center}
.radar svg.fp{width:min(420px,100%);height:auto}
.fp-ring{fill:none;stroke:var(--gold-deep);stroke-width:1.6;opacity:.8}
.fp-ring.dim{opacity:.35}
.fp-arc{fill:none;stroke:var(--blue);stroke-width:3;stroke-linecap:round}
.fp-core{fill:url(#fpGrad)}
.fp-sweep{fill:none;stroke:var(--gold);stroke-width:2;opacity:.9}
.fp-sweep{transform-origin:center;animation:sweep 5s linear infinite}
@keyframes sweep{to{transform:rotate(360deg)}}
.fp-pin{fill:var(--blue)}
.radar .card-float{
  position:absolute;background:var(--card);border:1px solid var(--line);
  border-radius:12px;padding:10px 14px;box-shadow:var(--shadow-lg);
  font-size:13px;font-weight:700;display:flex;align-items:center;gap:9px;
  white-space:nowrap;
}
.card-float .pf{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:900;color:#fff}
.card-float.c1{top:10%;left:6%}
.card-float.c2{bottom:12%;left:14%}
.card-float.c3{top:20%;right:6%}
.card-float small{display:block;font-weight:600;color:var(--muted);font-size:11px}
.pf.shopee{background:#EE4D2D}
.pf.amazon{background:#FF9900;color:#232F3E}
.pf.tiktok{background:#111}

/* ---------- 通用 section ---------- */
.section{padding:64px 0}
.section.tint{background:var(--card);border-top:1px solid var(--line-soft);border-bottom:1px solid var(--line-soft)}
.sec-head{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:34px}
.sec-title{font-size:30px;font-weight:900;letter-spacing:-.3px;line-height:1.3}
.sec-title .hl{color:var(--blue)}
.sec-lead{color:var(--muted);font-size:15.5px;margin-top:8px;max-width:640px}
.sec-more{flex:none;font-size:14px;font-weight:700;color:var(--blue);display:inline-flex;align-items:center;gap:5px}
.sec-more:hover{color:var(--blue-deep)}

/* ---------- 账号隔离舱 pods ---------- */
.pods{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.pod{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;position:relative;overflow:hidden;transition:.22s;
}
.pod:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:rgba(255,215,0,.5)}
.pod::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--gold),var(--blue))}
.pod-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.pod-ico{width:44px;height:44px;border-radius:11px;display:flex;align-items:center;justify-content:center;font-weight:900;color:#fff;font-size:19px}
.pod-ico.a{background:linear-gradient(135deg,#EE4D2D,#FF7A45)}
.pod-ico.b{background:linear-gradient(135deg,#FF9900,#FFC24D);color:#232F3E}
.pod-ico.c{background:linear-gradient(135deg,#111,#444)}
.pod-env{font-size:11px;font-weight:800;letter-spacing:.6px;color:var(--muted);background:var(--line-soft);padding:4px 10px;border-radius:999px}
.pod-t{font-size:18px;font-weight:800;margin-bottom:8px}
.pod-d{font-size:14px;color:var(--muted);margin-bottom:14px}
.pod-stats{display:flex;gap:16px;font-size:12px;color:var(--muted);font-family:var(--mono)}
.pod-stats b{display:block;font-size:18px;color:var(--ink);font-weight:800}

/* ---------- 特性网格 feats ---------- */
.feats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.feat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:22px;transition:.2s;
}
.feat:hover{box-shadow:var(--shadow);border-color:rgba(51,112,255,.35)}
.feat-ico{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,var(--gold),var(--gold-deep));display:flex;align-items:center;justify-content:center;margin-bottom:14px;color:#3A2C00}
.feat-ico.blue{background:linear-gradient(135deg,var(--blue),#6B9AFF);color:#fff}
.feat-ico.navy{background:linear-gradient(135deg,var(--ink),#33456A);color:var(--gold)}
.feat-t{font-size:16px;font-weight:800;margin-bottom:7px}
.feat-d{font-size:14px;color:var(--muted)}

/* ---------- 三步流程 steps ---------- */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:step}
.step{position:relative;padding:26px 24px 24px;background:var(--card);border:1px solid var(--line);border-radius:var(--radius)}
.step-no{
  width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-family:var(--mono);font-weight:800;font-size:18px;margin-bottom:14px;
  background:var(--navy);color:var(--gold);border:2px solid var(--gold);
}
.step-t{font-size:17px;font-weight:800;margin-bottom:8px}
.step-d{font-size:14px;color:var(--muted)}

/* ---------- 左右图文 split ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:44px;align-items:center;padding:34px 0}
.split.rev .split-img{order:2}
.split-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-lg)}
.split-img img{width:100%;height:100%;aspect-ratio:16/11;object-fit:cover}
.split-txt h3{font-size:24px;font-weight:900;margin-bottom:14px;line-height:1.35}
.split-txt p{color:var(--muted);font-size:15.5px;margin-bottom:12px}

/* ---------- 表格 ---------- */
.table{overflow-x:auto;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
table{width:100%;border-collapse:collapse;min-width:640px}
th,td{padding:15px 20px;text-align:left;border-bottom:1px solid var(--line-soft)}
th{background:var(--navy);color:#fff;font-weight:700;font-size:14px;letter-spacing:.3px}
th:first-child{border-radius:0}
tr:last-child td{border-bottom:none}
tbody tr:hover{background:#FBFCFE}
td.hl{font-weight:800;color:var(--blue)}
.yes{color:var(--green);font-weight:800}
.no{color:var(--muted)}
.tag{display:inline-block;font-size:12px;font-weight:800;padding:3px 10px;border-radius:999px;background:var(--gold-soft);color:#7A5B00}

/* ---------- 提示 / 警示 ---------- */
.tip,.callout{border-radius:12px;padding:16px 18px;font-size:14.5px;display:flex;gap:12px;align-items:flex-start;margin:18px 0}
.tip{background:#EFF6FF;border:1px solid #C7DBFF;color:#1E4BA0}
.callout{background:#FFF9E8;border:1px solid #F5DF9B;color:#7A5B00}
.tip .ico,.callout .ico{flex:none;font-weight:900;font-size:16px}

/* ---------- FAQ ---------- */
.faq{max-width:820px;margin:0 auto}
.faq-item{background:var(--card);border:1px solid var(--line);border-radius:14px;margin-bottom:12px;overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;font-size:16px;font-weight:700;color:var(--ink);text-align:left}
.faq-q .ico{flex:none;width:26px;height:26px;border-radius:50%;background:var(--gold-soft);color:#7A5B00;display:flex;align-items:center;justify-content:center;font-weight:900;transition:.2s}
.faq-item.open .faq-q .ico{transform:rotate(45deg);background:var(--gold);color:#3A2C00}
.faq-a{display:none;padding:0 22px 20px;color:var(--muted);font-size:15px}
.faq-item.open .faq-a{display:block}

/* ---------- 文章卡片 cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.22s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.card-img{height:170px;overflow:hidden;background:var(--line-soft)}
.card-img img{width:100%;height:100%;object-fit:cover;transition:.4s}
.card:hover .card-img img{transform:scale(1.06)}
.card-b{padding:18px;display:flex;flex-direction:column;flex:1}
.card-cat{font-size:12px;font-weight:800;color:var(--blue);background:#EFF4FF;padding:3px 10px;border-radius:999px;align-self:flex-start;margin-bottom:10px}
.card-t{font-size:16.5px;font-weight:800;line-height:1.45;margin-bottom:8px}
.card-d{font-size:14px;color:var(--muted);flex:1;margin-bottom:12px}
.card-more{font-size:13.5px;font-weight:700;color:var(--blue)}

/* ---------- 面包屑 ---------- */
.crumb{font-size:13.5px;color:var(--muted);padding:16px 0 4px}
.crumb a:hover{color:var(--blue)}
.crumb span{color:var(--ink);font-weight:600}

/* ---------- 内页 hero ---------- */
.page-hero{
  background:
    radial-gradient(640px 300px at 80% 12%,rgba(255,215,0,.16),transparent 60%),
    radial-gradient(560px 280px at 12% 88%,rgba(51,112,255,.09),transparent 60%),
    var(--bg);
  border-bottom:1px solid var(--line-soft);
}
.page-hero-in{padding:52px 0 46px}
.page-title{font-size:38px;font-weight:900;letter-spacing:-.4px;margin:14px 0 12px}
.page-sub{font-size:16px;color:var(--muted);max-width:680px}

/* ---------- 平台矩阵 plats ---------- */
.plats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.plat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;transition:.2s;position:relative;overflow:hidden;
  display:flex;flex-direction:column;
}
.plat::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--gold),var(--blue))}
.plat:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.plat-ico{width:46px;height:46px;border-radius:12px;background:var(--navy);color:var(--gold);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.plat-t{font-size:17px;font-weight:800;margin-bottom:7px}
.plat-d{font-size:13.5px;color:var(--muted);margin-bottom:14px;flex:1}
.plat-cta{font-size:14px;font-weight:800;color:var(--blue);display:inline-flex;align-items:center;gap:5px}
.plat-cta:hover{color:var(--blue-deep)}

/* ---------- 下载/平台页 spec-grid ---------- */
.spec-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.spec-item{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:16px 18px;display:flex;justify-content:space-between;gap:14px}
.spec-item .k{font-size:13.5px;color:var(--muted);flex:none}
.spec-item .v{font-weight:800;font-size:14.5px;text-align:right}

/* ---------- 文章双栏 ---------- */
.article-grid{display:grid;grid-template-columns:250px 1fr;gap:40px;align-items:start}
.toc-nav{position:sticky;top:92px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:18px}
.toc-nav h4{font-size:13px;font-weight:800;letter-spacing:.4px;color:var(--muted);margin-bottom:12px}
.toc-link{display:block;font-size:14px;color:var(--ink-2);padding:7px 10px;border-radius:8px;margin-bottom:2px;border-left:2px solid transparent}
.toc-link:hover,.toc-link.active{color:var(--blue);background:var(--line-soft);border-left-color:var(--gold)}
.article-body{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:34px 38px;box-shadow:var(--shadow)}
.article-meta{display:flex;align-items:center;gap:12px;font-size:13.5px;color:var(--muted);margin:8px 0 20px;flex-wrap:wrap}
.badge{font-size:12px;font-weight:800;color:var(--blue);background:#EFF4FF;padding:3px 11px;border-radius:999px}
.lead{font-size:17px;color:var(--ink-2);font-weight:600;border-left:4px solid var(--gold);padding:6px 0 6px 16px;margin-bottom:22px}
.article-body h2{font-size:23px;font-weight:900;margin:30px 0 12px;padding-top:8px}
.article-body h3{font-size:18px;font-weight:800;margin:24px 0 10px}
.article-body p{color:var(--ink-2);font-size:15.5px;margin-bottom:14px}
.article-body ul,.article-body ol{margin:0 0 16px 22px}
.article-body li{color:var(--ink-2);font-size:15.5px;margin-bottom:8px}
.article-body ol{list-style:decimal}
.article-body ul{list-style:disc}
.article-body img{border-radius:12px;margin:18px 0}
.article-body .cap{font-size:13px;color:var(--muted);text-align:center;margin:-8px 0 20px}
.author{display:flex;align-items:center;gap:12px;margin-top:28px;padding-top:20px;border-top:1px solid var(--line-soft)}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--gold),var(--blue));color:#fff;font-weight:900;display:flex;align-items:center;justify-content:center;font-size:18px}
.author b{display:block;font-size:14.5px}
.author small{color:var(--muted);font-size:12.5px}

/* ---------- CTA ---------- */
.cta{
  background:linear-gradient(135deg,var(--navy),var(--navy-2));
  border-radius:var(--radius);padding:44px 46px;color:#fff;
  display:flex;align-items:center;justify-content:space-between;gap:28px;flex-wrap:wrap;
  position:relative;overflow:hidden;
}
.cta::before{content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;background:radial-gradient(circle,rgba(255,215,0,.35),transparent 70%)}
.cta-t{font-size:26px;font-weight:900;margin-bottom:8px}
.cta-d{color:#C6D2E6;font-size:15px}
.cta-actions{display:flex;gap:12px;position:relative}

/* ---------- 相关卡片 ---------- */
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:28px}
.related-card{background:var(--line-soft);border:1px solid var(--line);border-radius:12px;padding:16px;transition:.2s}
.related-card:hover{border-color:var(--blue);background:#fff}
.related-card b{display:block;font-size:15px;margin-bottom:5px;line-height:1.4}
.related-card span{font-size:13px;color:var(--muted)}

/* ---------- 页脚 ---------- */
.foot{background:var(--navy-2);color:#B8C4D8;margin-top:64px}
.foot-in{display:grid;grid-template-columns:1.2fr 1fr 1fr 1fr;gap:40px;padding:54px 0 40px}
.foot-brand .brand{display:inline-flex;filter:none;opacity:1;background:#fff;border-radius:10px;padding:8px 12px;margin-bottom:16px}
.foot-brand p{font-size:14px;color:#8E9CB4;max-width:320px}
.foot h5{color:#fff;font-size:15px;font-weight:800;margin-bottom:16px}
.foot-links li{margin-bottom:10px}
.foot-links a{font-size:14px;color:#8E9CB4;transition:.18s}
.foot-links a:hover{color:var(--gold)}
.foot-copy{border-top:1px solid #22304A;padding:18px 0;text-align:center;font-size:13.5px;color:#6E7D98}

/* ---------- 返回顶部 / 其他 ---------- */
.backtop{
  position:fixed;right:22px;bottom:26px;z-index:50;width:44px;height:44px;border-radius:12px;
  background:var(--navy);color:var(--gold);font-size:20px;display:none;align-items:center;justify-content:center;
  box-shadow:var(--shadow-lg);transition:.2s;
}
.backtop.show{display:flex}
.backtop:hover{transform:translateY(-3px)}

.notfound{text-align:center;padding:110px 0}
.notfound .code{font-family:var(--mono);font-size:96px;font-weight:900;color:var(--gold-deep);line-height:1}
.notfound h2{font-size:26px;margin:18px 0 10px}
.notfound p{color:var(--muted);margin-bottom:26px}

.search-box{max-width:600px;margin:0 auto}
.search-input{
  width:100%;padding:16px 20px;font-size:16px;border:2px solid var(--line);border-radius:14px;
  background:var(--card);color:var(--ink);outline:none;transition:.2s;
}
.search-input:focus{border-color:var(--gold)}
.search-results{max-width:820px;margin:28px auto 0}

.social{display:flex;gap:10px;margin-top:18px}
.social a{width:38px;height:38px;border-radius:10px;background:#22304A;display:flex;align-items:center;justify-content:center;color:#C6D2E6;transition:.2s}
.social a:hover{background:var(--gold);color:#3A2C00}

/* ---------- 响应式 ---------- */
@media(max-width:980px){
  .hero-in{grid-template-columns:1fr;padding:48px 0}
  .radar{height:360px;order:-1}
  .hero-title{font-size:36px}
  .feats{grid-template-columns:repeat(2,1fr)}
  .pods,.steps{grid-template-columns:1fr}
  .plats{grid-template-columns:repeat(2,1fr)}
  .cards,.related{grid-template-columns:repeat(2,1fr)}
  .article-grid{grid-template-columns:1fr}
  .toc-nav{position:static}
  .split{grid-template-columns:1fr;gap:24px}
  .split.rev .split-img{order:0}
  .foot-in{grid-template-columns:1fr;gap:30px}
  .nav{display:none}
  .menu-btn{display:block}
  .nav.open{display:flex;flex-direction:column;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:12px 22px;box-shadow:var(--shadow)}
  .nav-cta{display:none}
  .spec-grid{grid-template-columns:1fr}
}
@media(max-width:600px){
  .hero-title{font-size:30px}
  .feats,.plats,.cards,.related{grid-template-columns:1fr}
  .sec-title{font-size:24px}
  .article-body{padding:24px 20px}
  .cta{padding:32px 24px}
}