:root{
  --navy:#102a4a;
  --navy-2:#173d68;
  --blue:#1357a6;
  --blue-2:#2b70bd;
  --green:#23865b;
  --orange:#e58a19;
  --purple:#6c51b5;
  --teal:#118b8d;
  --red:#d65f45;
  --ink:#172538;
  --muted:#5c6b7c;
  --line:#d7e2ee;
  --line-strong:#c4d3e2;
  --page:#f4f7fb;
  --soft:#f8fafc;
  --soft-blue:#eef5fc;
  --white:#fff;
  --max:1320px;
  --radius:10px;
  --shadow:0 8px 24px rgba(23,55,89,.07);
  --shadow-hover:0 14px 34px rgba(23,55,89,.11);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;background:var(--page)}
body{margin:0;color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Arial,sans-serif;font-size:15px;line-height:1.62;background:var(--page);-webkit-font-smoothing:antialiased}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:none}
img{max-width:100%;height:auto}
code{font-family:Consolas,Monaco,monospace;background:#edf3f9;padding:.12rem .34rem;border:1px solid #d9e5f0;border-radius:4px;font-size:.9em;color:#193f69}
.container{width:min(var(--max),calc(100% - 48px));margin:auto}
.narrow{width:min(880px,100%)}
.skip-link{position:absolute;left:-9999px;top:0;background:#fff;color:#000;padding:10px;z-index:1000}
.skip-link:focus{left:10px}

/* Header */
.site-header{position:sticky;top:0;z-index:50;border-bottom:1px solid rgba(204,217,230,.92);background:rgba(255,255,255,.97);backdrop-filter:blur(10px)}
.header-inner{height:64px;display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:10px;color:var(--ink);min-width:205px}
.brand img{width:38px;height:38px}
.brand span{display:grid;line-height:1.12}
.brand strong{font-size:17px;letter-spacing:.02em;color:var(--navy)}
.brand small{font-size:11px;color:var(--muted);margin-top:4px;letter-spacing:.04em}
.site-nav{display:flex;align-items:center;gap:18px;margin-left:auto}
.site-nav a{position:relative;color:#31455b;font-size:13px;font-weight:700;padding:22px 0 19px}
.site-nav a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--blue);transform:scaleX(0);transform-origin:center;transition:.18s}
.site-nav a:hover,.site-nav a.active{color:var(--blue)}
.site-nav a:hover::after,.site-nav a.active::after{transform:scaleX(1)}
.header-cta,.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:1px solid var(--blue);background:var(--blue);color:#fff;padding:9px 15px;border-radius:6px;font-size:13px;font-weight:800;box-shadow:0 4px 12px rgba(19,87,166,.13);transition:.18s}
.header-cta:hover,.button:hover{background:var(--navy-2);border-color:var(--navy-2);transform:translateY(-1px)}
.button.secondary{background:#fff;color:var(--blue);box-shadow:none}
.button.secondary:hover{background:var(--soft-blue)}
.nav-toggle{display:none;border:1px solid var(--line);background:#fff;padding:7px 11px;border-radius:5px;color:var(--navy);font-weight:700}

/* Typography */
h1,h2,h3{line-height:1.28;margin-top:0;color:var(--navy)}
h1{font-size:clamp(30px,3.6vw,44px);letter-spacing:-.025em;margin-bottom:16px;font-weight:800}
h2{font-size:clamp(23px,2.2vw,30px);letter-spacing:-.015em;margin-bottom:12px;font-weight:800}
h3{font-size:17px;margin-bottom:8px;font-weight:800}
p{margin-top:0}

/* Hero */
.hero{position:relative;padding:58px 0 48px;background:
  linear-gradient(90deg,rgba(19,87,166,.045) 1px,transparent 1px) 0 0/32px 32px,
  linear-gradient(rgba(19,87,166,.035) 1px,transparent 1px) 0 0/32px 32px,
  linear-gradient(180deg,#f8fbff 0,#f2f7fc 100%);border-bottom:1px solid var(--line);overflow:hidden}
.hero::after{content:"";position:absolute;right:-110px;top:-150px;width:420px;height:420px;border:72px solid rgba(19,87,166,.045);border-radius:50%;pointer-events:none}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.72fr) minmax(300px,.68fr);gap:48px;align-items:center}
.eyebrow{text-transform:uppercase;letter-spacing:.11em;font-size:11px;font-weight:900;color:var(--blue);margin:0 0 10px}

.hero-title-line{display:block}
.hero-lead{font-size:16px;line-height:1.72;color:#40536a;max-width:860px;margin:0 0 20px}
.badge-row{display:flex;flex-wrap:wrap;gap:7px;margin:0 0 22px}
.tech-badge{font-family:Consolas,Monaco,monospace;font-size:12px;line-height:1.2;padding:6px 9px;border:1px solid #c7d8e9;background:rgba(255,255,255,.9);border-radius:5px;color:#174a7f;font-weight:700}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap}
.hero-proof{border:1px solid var(--line-strong);background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.proof-title{font-weight:900;margin:0;padding:12px 16px;background:var(--navy);color:#fff;font-size:14px;letter-spacing:.02em}
.hero-proof dl{margin:0}
.hero-proof dl div{display:grid;grid-template-columns:82px 1fr;gap:12px;padding:11px 16px;border-top:1px solid var(--line);align-items:center}
.hero-proof dl div:first-child{border-top:0}
.hero-proof dt{font-size:12px;color:var(--muted);font-weight:700}
.hero-proof dd{margin:0;font-size:13px;font-weight:800;color:#243c57}
.page-hero{padding:52px 0 34px;background:linear-gradient(180deg,#f6f9fd,#edf4fa);border-bottom:1px solid var(--line)}
.page-hero h1{font-size:clamp(30px,3.5vw,44px)}
.page-hero p{font-size:16px;color:var(--muted)}

/* Sections */
.section{padding:58px 0;background:#fff}
.section.muted{background:var(--page)}
.section-head{max-width:900px;margin-bottom:26px}
.section-head p:last-child{font-size:15px;color:var(--muted);margin-bottom:0;line-height:1.72}

/* Capability modules */
.capability-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.capability{position:relative;display:block;border:1px solid var(--line);border-radius:var(--radius);padding:0 20px 20px;color:var(--ink);background:#fff;min-height:190px;overflow:hidden;transition:.2s;box-shadow:0 2px 10px rgba(23,55,89,.035)}
.capability::before{content:"";display:block;height:7px;margin:0 -20px 18px;background:var(--blue)}
.capability:nth-child(2)::before{background:var(--green)}
.capability:nth-child(3)::before{background:var(--orange)}
.capability:nth-child(4)::before{background:var(--purple)}
.capability:nth-child(5)::before{background:var(--teal)}
.capability:nth-child(6)::before{background:var(--navy-2)}
.capability:hover{box-shadow:var(--shadow-hover);transform:translateY(-3px);border-color:#becfe0}
.capability span{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;font-family:Consolas,monospace;font-size:12px;color:#fff;font-weight:900;margin-bottom:14px;border-radius:50%;background:var(--blue)}
.capability:nth-child(2) span{background:var(--green)}
.capability:nth-child(3) span{background:var(--orange)}
.capability:nth-child(4) span{background:var(--purple)}
.capability:nth-child(5) span{background:var(--teal)}
.capability:nth-child(6) span{background:var(--navy-2)}
.capability h3{margin-bottom:8px;font-size:17px}
.capability p{color:var(--muted);margin:0;font-size:13.5px;line-height:1.62}

/* Flow board */
.flow-section{overflow:hidden;background:#fff}
.flow-board{border:1px solid var(--line);border-radius:12px;background:#f8fafc;padding:16px;box-shadow:0 4px 18px rgba(23,55,89,.04)}
.flow-scroll{overflow-x:auto;padding:2px 2px 10px;scrollbar-color:#b8c8d9 transparent}
.flow-grid{display:grid;grid-template-columns:repeat(var(--flow-count),minmax(192px,1fr));gap:12px;min-width:calc(var(--flow-count) * 192px);counter-reset:flow;align-items:stretch}
.flow-stage{position:relative;border:1px solid var(--line);border-radius:8px;background:#fff;min-height:282px;overflow:visible;box-shadow:0 2px 8px rgba(23,55,89,.035)}
.flow-stage-head{display:flex;align-items:center;gap:9px;min-height:52px;padding:10px 12px;background:var(--tone,var(--blue));color:#fff;border-radius:7px 7px 0 0}
.flow-stage-head h3{margin:0;color:#fff;font-size:14px;line-height:1.34}
.flow-number{display:inline-flex;flex:0 0 30px;width:30px;height:30px;align-items:center;justify-content:center;background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.35);color:#fff;border-radius:50%;font-family:Consolas,monospace;font-size:11px;font-weight:900}
.flow-stage-body{padding:14px 14px 16px}
.flow-stage p{color:#4b5d71;font-size:12.5px;line-height:1.58;margin-bottom:10px}
.flow-stage ul,.info-card ul{margin:10px 0 0;padding:0;list-style:none}
.flow-stage li,.info-card li{position:relative;margin:6px 0;padding-left:16px;color:#30465c;font-size:12.5px;line-height:1.5}
.flow-stage li::before,.info-card li::before{content:"✓";position:absolute;left:0;top:0;color:var(--tone,var(--blue));font-weight:900}
.flow-stage:not(:last-child)::after{content:"➜";position:absolute;right:-17px;top:22px;font-size:18px;color:#6686a7;font-weight:900;z-index:3;text-shadow:0 0 4px #f8fafc}
.flow-stage.tone-1{--tone:var(--blue)}
.flow-stage.tone-2{--tone:var(--green)}
.flow-stage.tone-3{--tone:var(--orange)}
.flow-stage.tone-4{--tone:var(--purple)}
.flow-stage.tone-5{--tone:var(--teal)}
.flow-stage.tone-6{--tone:var(--navy-2)}

/* Information cards */
.card-grid{display:grid;gap:16px}
.card-grid.three{grid-template-columns:repeat(3,1fr)}
.card-grid.two{grid-template-columns:repeat(2,1fr)}
.info-card{--tone:var(--blue);position:relative;background:#fff;border:1px solid var(--line);padding:0 20px 20px;border-radius:var(--radius);overflow:hidden;box-shadow:0 2px 10px rgba(23,55,89,.035)}
.info-card::before{content:"";display:block;height:6px;margin:0 -20px 17px;background:var(--tone)}
.info-card:nth-child(2){--tone:var(--green)}
.info-card:nth-child(3){--tone:var(--orange)}
.info-card:nth-child(4){--tone:var(--purple)}
.info-card h3{font-size:16px;margin-bottom:7px}
.info-card p{color:var(--muted);font-size:13.5px;line-height:1.62;margin-bottom:8px}

/* Architecture table */
.architecture{border:1px solid var(--line-strong);border-radius:10px;overflow:hidden;background:#fff;box-shadow:0 4px 16px rgba(23,55,89,.04)}
.arch-row{--tone:var(--blue);display:grid;grid-template-columns:185px 1fr;border-top:1px solid var(--line)}
.arch-row:first-child{border-top:0}
.arch-row:nth-child(2){--tone:var(--green)}
.arch-row:nth-child(3){--tone:var(--orange)}
.arch-row:nth-child(4){--tone:var(--purple)}
.arch-row:nth-child(5){--tone:var(--teal)}
.arch-row:nth-child(6){--tone:var(--navy-2)}
.arch-layer{display:flex;align-items:center;padding:15px 18px;background:var(--tone);color:#fff;font-size:13px;font-weight:900;letter-spacing:.01em}
.arch-items{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:12px 14px;background:#fff}
.arch-items span{border:1px solid #cfdae6;background:#f9fbfd;padding:7px 10px;border-radius:5px;font-family:Consolas,Monaco,monospace;font-size:12px;color:#27435f}

/* FAQ */
.faq-list{display:grid;gap:10px;max-width:980px}
details{border:1px solid var(--line);border-radius:8px;background:#fff;padding:0 18px;box-shadow:0 2px 8px rgba(23,55,89,.025)}
summary{cursor:pointer;font-weight:800;padding:15px 0;color:#15385f;font-size:14px}
details p{color:var(--muted);margin:0 0 16px;font-size:13.5px;line-height:1.68}

/* Contact */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.contact-panel{border:1px solid var(--line);border-radius:var(--radius);padding:0 22px 22px;background:#fff;overflow:hidden;box-shadow:0 3px 12px rgba(23,55,89,.035)}
.contact-panel::before{content:"";display:block;height:7px;margin:0 -22px 18px;background:var(--blue)}
.contact-panel:nth-child(2)::before{background:var(--green)}
.contact-panel:nth-child(3)::before{background:var(--orange)}
.contact-panel h2{font-size:20px}
.contact-email{font-size:16px;font-weight:800;word-break:break-all}
.qr-panel img{display:block;width:min(230px,100%);margin:13px auto 0;border:1px solid var(--line);padding:8px;background:#fff}
.address{font-size:18px;font-weight:800;color:var(--navy)}
.contact-meta{margin-top:18px}
.contact-meta div{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:9px 0;font-size:13px}
.contact-meta dt{color:var(--muted)}
.contact-meta dd{margin:0;font-weight:700}
.config-note{font-size:11px;color:var(--muted)}
.brief-form{display:grid;gap:15px}
.brief-form label{display:grid;gap:6px;font-weight:700;font-size:13px}
.brief-form input,.brief-form select,.brief-form textarea{width:100%;font:inherit;font-size:14px;border:1px solid #bfcddb;border-radius:6px;padding:10px 11px;background:#fff}
.brief-form input:focus,.brief-form select:focus,.brief-form textarea:focus{outline:2px solid rgba(19,87,166,.13);border-color:var(--blue)}
.brief-form textarea{resize:vertical}

/* Footer */
.site-footer{background:#102944;color:#dce6ef;padding:38px 0 16px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr .8fr;gap:28px}
.site-footer h2{color:#fff;font-size:16px;margin-bottom:8px}
.site-footer p{font-size:12.5px;line-height:1.65;color:#bccbd9}
.site-footer a{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.13);display:flex;justify-content:space-between;gap:20px;margin-top:22px;padding-top:14px}
.footer-bottom p{margin:0;font-size:11px}

/* Responsive */
@media (max-width:1120px){
  .site-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:10px 20px;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:0}
  .site-nav.open{display:flex}
  .site-nav a{padding:9px 0}
  .site-nav a::after{display:none}
  .nav-toggle{display:block;margin-left:auto}
  .header-cta{display:none}
  .hero-grid{grid-template-columns:1fr}
  .hero-proof{max-width:720px}
  .capability-grid,.card-grid.three,.contact-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:760px){
  .container{width:min(100% - 28px,var(--max))}
  .header-inner{height:60px}
  .brand{min-width:auto}
  .brand small{display:none}
  .site-nav{top:60px}
  .hero{padding:44px 0 36px}
  .hero-grid{gap:28px}
  h1{font-size:32px}
  h2{font-size:24px}
  .hero-lead{font-size:15.5px}
  .section{padding:44px 0}
  .capability-grid,.card-grid.three,.card-grid.two,.contact-grid{grid-template-columns:1fr}
  .capability{min-height:auto}
  .flow-board{padding:10px}
  .flow-scroll{overflow:visible;padding-bottom:0}
  .flow-grid{display:grid;grid-template-columns:1fr;min-width:0;gap:12px}
  .flow-stage{min-height:auto}
  .flow-stage:not(:last-child)::after{content:"↓";right:auto;left:50%;top:auto;bottom:-18px;transform:translateX(-50%);background:#f8fafc;padding:0 4px}
  .arch-row{grid-template-columns:1fr}
  .arch-layer{padding:10px 14px}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{display:block}
  .footer-bottom p+p{margin-top:7px}
}
@media print{
  .site-header,.site-footer,.hero-actions,.nav-toggle{display:none!important}
  body{font-size:10pt;background:#fff}
  .section,.hero{padding:22px 0}
  .flow-board,.flow-stage,.info-card,.capability{break-inside:avoid;box-shadow:none}
  .flow-scroll{overflow:visible}
  .flow-grid{min-width:0;grid-template-columns:repeat(3,1fr)}
}

/* Test lab matrix */
.test-quadrants{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.test-quadrant{--tone:var(--blue);border:1px solid var(--line);border-radius:12px;background:#fff;overflow:hidden;box-shadow:0 4px 16px rgba(23,55,89,.045)}
.test-quadrant.apple-bt{--tone:var(--purple)}
.test-quadrant.android-usb{--tone:var(--green)}
.test-quadrant.android-wireless{--tone:var(--orange)}
.test-q-head{padding:16px 18px 14px;background:linear-gradient(135deg,var(--tone),#173d68);color:#fff}
.test-q-head span{display:block;font-family:Consolas,monospace;font-size:11px;font-weight:900;letter-spacing:.06em;text-transform:uppercase;opacity:.84;margin-bottom:5px}
.test-q-head h3{margin:0;color:#fff;font-size:17px}
.test-q-body{padding:17px 19px 19px}
.test-q-body h4{margin:14px 0 6px;color:var(--navy);font-size:13px}
.test-q-body h4:first-child{margin-top:0}
.test-q-body ul{margin:0;padding-left:18px}
.test-q-body li{margin:5px 0;color:#3c5065;font-size:13px}
.test-q-body p{margin:15px 0 0;padding-top:13px;border-top:1px dashed var(--line);font-size:13px;color:var(--muted)}

/* Troubleshooting records */
.issue-list{display:grid;gap:18px}
.issue-record{scroll-margin-top:84px;border:1px solid var(--line-strong);border-radius:12px;background:#fff;overflow:hidden;box-shadow:0 4px 18px rgba(23,55,89,.045)}
.issue-title{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#f3f7fb;border-bottom:1px solid var(--line)}
.issue-title>span{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;font-family:Consolas,monospace;font-size:12px;font-weight:900}
.issue-title p{margin:0 0 2px;color:var(--blue);font-family:Consolas,monospace;font-size:10.5px;font-weight:900;text-transform:uppercase;letter-spacing:.055em}
.issue-title h3{margin:0;font-size:17px}
.issue-columns{display:grid;grid-template-columns:1.05fr 1.25fr 1.25fr}
.issue-columns section{padding:17px 18px;border-left:1px solid var(--line)}
.issue-columns section:first-child{border-left:0}
.issue-columns h4{margin:0 0 8px;font-size:12px;color:var(--navy);text-transform:uppercase;letter-spacing:.04em}
.issue-columns p,.issue-columns li{font-size:12.8px;color:#465b70;line-height:1.62}
.issue-columns p{margin:0}
.issue-columns ul{margin:0;padding-left:18px}
.issue-columns li{margin:5px 0}
.issue-tools{display:flex;align-items:center;flex-wrap:wrap;gap:7px;padding:11px 18px;background:#f9fbfd;border-top:1px solid var(--line)}
.issue-tools strong{font-size:11px;color:var(--muted);margin-right:4px}
.issue-tools span,.blog-tags span{border:1px solid #cad9e8;background:#fff;border-radius:4px;padding:4px 7px;font-family:Consolas,monospace;font-size:10.5px;color:#24517e;font-weight:700}
.issue-link{margin:0;padding:0 18px 14px;background:#f9fbfd;text-align:right;font-size:12px;font-weight:800}

/* Blog */
.blog-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.blog-card{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:12px;background:#fff;padding:22px;box-shadow:0 4px 16px rgba(23,55,89,.04);transition:.18s}
.blog-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-hover)}
.blog-category{margin:0 0 8px;color:var(--blue);font-size:11px;font-family:Consolas,monospace;font-weight:900;text-transform:uppercase;letter-spacing:.055em}
.blog-card h2{font-size:20px;line-height:1.4;margin-bottom:10px}
.blog-card h2 a{color:var(--navy)}
.blog-card>p:not(.blog-category){font-size:13.5px;color:var(--muted);line-height:1.68}
.blog-tags{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 16px}
.text-link{margin-top:auto;font-size:13px;font-weight:900}

/* Technical articles */
.article-hero{padding:52px 0 34px;background:
  linear-gradient(90deg,rgba(19,87,166,.04) 1px,transparent 1px) 0 0/30px 30px,
  linear-gradient(rgba(19,87,166,.03) 1px,transparent 1px) 0 0/30px 30px,
  linear-gradient(180deg,#f7fbff,#edf4fa);border-bottom:1px solid var(--line)}
.article-hero h1{font-size:clamp(30px,3.3vw,43px);max-width:980px}
.article-lead{font-size:16px;line-height:1.78;color:#40536a;max-width:900px}
.article-meta{font-size:11.5px;color:#738296;margin-top:14px}
.article-layout{display:grid;grid-template-columns:minmax(0,820px) minmax(230px,300px);gap:44px;align-items:start;padding-top:50px;padding-bottom:64px}
.article-content{min-width:0}
.article-content section{margin-bottom:42px;scroll-margin-top:84px}
.article-content h2{font-size:25px;margin-bottom:14px;padding-bottom:9px;border-bottom:1px solid var(--line)}
.article-content h3{font-size:16px}
.article-content p,.article-content li{font-size:14.5px;line-height:1.82;color:#354b61}
.article-content ul,.article-content ol{padding-left:22px}
.article-content li{margin:7px 0}
.article-aside{position:sticky;top:86px;border:1px solid var(--line);border-radius:10px;background:#fff;padding:18px;box-shadow:0 4px 16px rgba(23,55,89,.04)}
.article-aside h2{font-size:16px}
.article-aside ul{margin:0 0 18px;padding-left:18px}
.article-aside li{margin:8px 0;font-size:12.5px}
.article-callout{border-left:5px solid var(--orange);background:#fff8eb;border-radius:6px;padding:15px 17px;margin:18px 0}
.article-callout strong{display:block;color:#9b5a09;margin-bottom:5px;font-size:13px}
.article-callout p{margin:0}
.compare-table{display:grid;grid-template-columns:1.35fr 1fr;border:1px solid var(--line);border-radius:8px;overflow:hidden;margin:18px 0}
.compare-table>div{padding:11px 13px;border-top:1px solid var(--line);border-left:1px solid var(--line);font-size:12.8px;line-height:1.6;background:#fff;color:#3c5268}
.compare-table>div:nth-child(odd){border-left:0}
.compare-table>div:nth-child(-n+2){border-top:0}
.compare-head{background:var(--navy)!important;color:#fff!important;font-weight:900}
.diagnostic-steps{counter-reset:diag;list-style:none!important;padding-left:0!important;display:grid;gap:10px}
.diagnostic-steps li{position:relative;padding:12px 14px 12px 48px!important;border:1px solid var(--line);border-radius:8px;background:#fff;margin:0!important}
.diagnostic-steps li::before{counter-increment:diag;content:counter(diag,decimal-leading-zero);position:absolute;left:12px;top:11px;width:26px;height:26px;display:flex;align-items:center;justify-content:center;border-radius:50%;background:var(--blue);color:#fff;font-family:Consolas,monospace;font-size:10px;font-weight:900}
.article-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.article-grid article{border:1px solid var(--line);border-radius:8px;background:#fff;padding:15px}
.article-grid article p{font-size:13px;margin:0}
.article-list{border:1px solid var(--line);border-radius:8px;background:#fff;padding:14px 18px 14px 38px!important}

@media (max-width:1120px){
  .site-nav{gap:0}
  .article-layout{grid-template-columns:1fr}
  .article-aside{position:static}
}
@media (max-width:760px){
  .test-quadrants,.blog-grid,.article-grid{grid-template-columns:1fr}
  .issue-columns{grid-template-columns:1fr}
  .issue-columns section{border-left:0;border-top:1px solid var(--line)}
  .issue-columns section:first-child{border-top:0}
  .article-layout{padding-top:36px;gap:24px}
  .compare-table{grid-template-columns:1fr}
  .compare-table>div{border-left:0}
  .compare-table>div:nth-child(2){border-top:1px solid rgba(255,255,255,.2)}
  .compare-table>div:nth-child(n+3){border-top:1px solid var(--line)}
  .article-content h2{font-size:22px}
}
.capability:nth-child(7)::before{background:var(--red)}
.capability:nth-child(8)::before{background:var(--orange)}
.capability:nth-child(9)::before{background:var(--navy)}
.capability:nth-child(7) span{background:var(--red)}
.capability:nth-child(8) span{background:var(--orange)}
.capability:nth-child(9) span{background:var(--navy)}

/* Business imagery + text + semantic flow */
.visual-section{background:#edf3f9;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.visual-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.visual-card{overflow:hidden;border:1px solid var(--line-strong);border-radius:12px;background:#fff;box-shadow:var(--shadow);transition:.18s}
.visual-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-hover)}
.visual-image{display:block;aspect-ratio:16/10;overflow:hidden;background:#eaf1f8;border-bottom:1px solid var(--line)}
.visual-image img{width:100%;height:100%;object-fit:cover;object-position:center;transition:.25s}
.visual-card:hover .visual-image img{transform:scale(1.025)}
.visual-card>div{padding:17px 18px 19px}
.visual-card h3{font-size:17px;margin-bottom:7px}
.visual-card h3 a{color:var(--navy)}
.visual-card p{font-size:13px;color:var(--muted);margin:0 0 11px;line-height:1.65}

.media-section{background:#fff}
.media-feature{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(320px,.75fr);gap:30px;align-items:center;border:1px solid var(--line-strong);border-radius:14px;background:#f8fbfe;padding:18px;box-shadow:var(--shadow)}
.media-feature.media-reverse{grid-template-columns:minmax(320px,.75fr) minmax(0,1.45fr)}
.media-feature.media-reverse .business-figure{order:2}
.media-feature.media-reverse .media-copy{order:1}
.business-figure{margin:0;overflow:hidden;border:1px solid #c9d7e5;border-radius:10px;background:#fff}
.business-figure a{display:block;position:relative}
.business-figure a::after{content:"查看大图";position:absolute;right:10px;bottom:10px;padding:5px 9px;border-radius:5px;background:rgba(16,42,74,.86);color:#fff;font-size:11px;font-weight:800;opacity:0;transform:translateY(4px);transition:.18s}
.business-figure:hover a::after{opacity:1;transform:none}
.business-figure img{display:block;width:100%;aspect-ratio:3/2;object-fit:cover;object-position:center;background:#fff}
.business-figure figcaption{padding:8px 11px;border-top:1px solid var(--line);font-size:11.5px;color:var(--muted);background:#fff}
.media-copy{padding:8px 12px}
.media-copy h2{font-size:27px;margin-bottom:11px}
.media-copy>p:not(.eyebrow){font-size:14px;color:#465b70;line-height:1.75}
.check-list{list-style:none;margin:18px 0 0;padding:0;display:grid;gap:9px}
.check-list li{position:relative;padding:9px 11px 9px 36px;border:1px solid var(--line);border-radius:7px;background:#fff;font-size:13px;color:#334b62;font-weight:650}
.check-list li::before{content:"✓";position:absolute;left:11px;top:8px;display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:#e4f3eb;color:var(--green);font-size:11px;font-weight:900}

.hardware-section{background:#fff}
.hardware-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}
.hardware-card{display:grid;grid-template-columns:210px minmax(0,1fr);overflow:hidden;border:1px solid var(--line-strong);border-radius:12px;background:#fff;box-shadow:0 6px 20px rgba(23,55,89,.06)}
.hardware-card>a,.hardware-card>img{display:block;width:100%;height:100%;min-height:220px;background:#f4f7fb}
.hardware-card>a img,.hardware-card>img{width:100%;height:100%;object-fit:contain;padding:16px;background:#fff}
.hardware-card>div{padding:19px 20px}
.hardware-card h3{font-size:18px;margin:8px 0 8px}
.hardware-card p{margin:0 0 12px;font-size:13px;color:var(--muted);line-height:1.7}
.hardware-tag{display:inline-flex;padding:4px 8px;border-radius:4px;background:#eaf3fc;color:var(--blue);font:800 10.5px/1.2 Consolas,monospace;letter-spacing:.035em}
.hardware-tag.purple{background:#f0ecfb;color:var(--purple)}
.hardware-tag.green{background:#eaf6ef;color:var(--green)}
.hardware-tag.orange{background:#fff2df;color:#ad650b}
.source-link{font-size:11.5px;font-weight:800}

.software-window{overflow:hidden;border:1px solid #9fb5ca;border-radius:12px;background:#fff;box-shadow:0 14px 34px rgba(16,42,74,.11)}
.software-toolbar{display:grid;grid-template-columns:1fr auto auto;align-items:center;gap:18px;padding:11px 14px;background:#173d68;color:#fff;font-size:12px}
.software-toolbar span{color:#c7d7e7}
.software-toolbar button{border:1px solid #8bb0d4;border-radius:4px;background:#fff;color:#173d68;padding:6px 10px;font-size:11px;font-weight:800}
.software-layout{display:grid;grid-template-columns:230px minmax(0,1fr);min-height:390px}
.software-tree{display:flex;flex-direction:column;gap:4px;padding:15px;background:#eef4fa;border-right:1px solid var(--line)}
.software-tree strong{font-size:12px;color:var(--navy);margin-bottom:6px}
.software-tree a{display:flex;justify-content:space-between;gap:10px;padding:9px 10px;border-radius:5px;color:#38526b;font-size:12px}
.software-tree a.selected{background:#d9e9f8;color:#123f72;font-weight:800}
.software-tree b,.software-results b{font-size:10px}
.ok{color:#168352!important}.fail{color:#ce4437!important}
.software-results{padding:16px;min-width:0}
.result-head,.result-row{display:grid;grid-template-columns:1.5fr .55fr .6fr 1fr;gap:10px;align-items:center;padding:10px 12px;border-bottom:1px solid var(--line);font-size:12px}
.result-head{background:#edf3f8;color:#294b6c;font-weight:900;border:1px solid var(--line);border-radius:5px 5px 0 0}
.result-row{border-left:1px solid var(--line);border-right:1px solid var(--line)}
.result-row.warning{background:#fff6ef}
.software-results pre{overflow:auto;margin:16px 0 0;padding:14px;border:1px solid #223b55;border-radius:6px;background:#14283d;color:#dce9f5;font:12px/1.7 Consolas,monospace}

@media (max-width:1000px){
  .visual-grid{grid-template-columns:1fr 1fr}
  .media-feature,.media-feature.media-reverse{grid-template-columns:1fr}
  .media-feature.media-reverse .business-figure,.media-feature.media-reverse .media-copy{order:initial}
  .hardware-card{grid-template-columns:170px minmax(0,1fr)}
  .hardware-grid{grid-template-columns:1fr}
}
@media (max-width:700px){
  .visual-grid{grid-template-columns:1fr}
  .media-feature{padding:10px;gap:12px}
  .media-copy{padding:9px 7px 12px}
  .media-copy h2{font-size:23px}
  .business-figure img{aspect-ratio:16/11}
  .hardware-card{grid-template-columns:1fr}
  .hardware-card>a,.hardware-card>img{min-height:190px;max-height:230px}
  .software-toolbar{grid-template-columns:1fr;gap:5px}
  .software-toolbar button{justify-self:start}
  .software-layout{grid-template-columns:1fr}
  .software-tree{border-right:0;border-bottom:1px solid var(--line)}
  .result-head,.result-row{grid-template-columns:1.3fr .55fr .6fr}
  .result-head span:last-child,.result-row span:last-child{grid-column:1/-1}
}

/* Semantic connection diagrams inside the hardware page */
.topology-card{grid-template-columns:1fr;align-content:start}
.topology-visual{display:grid;gap:16px;align-content:center;min-height:220px;padding:26px 22px;background:linear-gradient(180deg,#eef5fc,#f9fbfd);border-bottom:1px solid var(--line)}
.topology-row{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:center;gap:9px}
.topology-row>i{font-style:normal;color:var(--blue);font-size:22px;font-weight:900;text-align:center}
.topology-node{display:flex;align-items:center;justify-content:center;min-height:60px;padding:10px;border:1px solid #b9cce0;border-radius:8px;background:#fff;color:#173d68;font-size:12px;font-weight:800;text-align:center;box-shadow:0 4px 10px rgba(23,55,89,.05)}
.topology-node.analyzer{border-color:#6e9fd0;background:#e9f3fd;color:#0d4f92}
.topology-node.dut{border-color:#8ac0a4;background:#eef8f2;color:#1e704d}
.topology-branch{display:grid;grid-template-columns:auto auto 1fr;align-items:center;justify-content:center;gap:9px;margin:auto;padding:9px 13px;border:1px dashed #9eb5ca;border-radius:7px;background:#fff;color:#36516b}
.topology-branch span{font-size:12px;font-weight:900}.topology-branch i{font-style:normal;color:var(--blue);font-weight:900}.topology-branch small{font-size:10.5px;color:var(--muted)}
.bluetooth-topology{background:linear-gradient(180deg,#f4f0fb,#fbf9fe)}
.bluetooth-topology .topology-row>i{color:var(--purple)}
.bluetooth-topology .topology-node.analyzer{border-color:#aa98d5;background:#f2effb;color:#6047a9}
@media(max-width:560px){.topology-row{grid-template-columns:1fr}.topology-row>i{transform:rotate(90deg)}.topology-branch{grid-template-columns:1fr;text-align:center}.topology-branch i{transform:rotate(180deg)}}