/* ============================================================
   VitalinkDX — Shared Design System
   One technical foundation (MAX86178) · Three hardware platforms
   ============================================================ */

:root{
  --ink:#0a1f2f;
  --ink-2:#1a3f5a;
  --ink-3:#2b4a66;
  --muted:#4d6f8c;
  --muted-2:#6c8ba0;
  --line:#e3ecf5;
  --line-2:#dce6ef;
  --bg:#f4f9fe;
  --card:#ffffff;
  --blue-900:#0b2b4a;
  --blue-800:#0d5a8f;
  --blue-700:#1f6a9e;
  --blue-600:#1f7ab8;
  --blue-100:#eef2f6;
  --blue-50:#e3ecf5;
  --teal:#0d8f8f;
  --green:#1f7a3d;
  --green-soft:#e8f5ec;
  --amber:#EF9F27;
  --amber-soft:#fdf6e8;
  --rose:#d85a30;
  --rose-soft:#fdf0f0;
  --violet:#6b4ea8;
  --radius:22px;
  --radius-sm:12px;
  --shadow:0 20px 50px -12px rgba(0,20,40,.15);
  --shadow-sm:0 6px 20px -8px rgba(0,30,50,.14);
  --mono:"SFMono-Regular",Consolas,"Liberation Mono",Menlo,monospace;
}

*{margin:0;padding:0;box-sizing:border-box}

html{scroll-behavior:smooth;scroll-padding-top:96px}

body{
  background:var(--bg);
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Microsoft YaHei",sans-serif;
  color:var(--ink);
  line-height:1.62;
  -webkit-font-smoothing:antialiased;
  padding:1.25rem;
}

/* ---------- bilingual ---------- */
body[data-lang="en"] .zh{display:none !important}
body[data-lang="zh"] .en{display:none !important}
body[data-lang="en"] .zh-inline{display:none !important}
body[data-lang="zh"] .en-inline{display:none !important}
.lang-switch button{cursor:pointer;font-family:inherit}

/* ---------- layout ---------- */
.wrap{max-width:1340px;margin:0 auto}
.shell{
  background:var(--card);
  border-radius:34px;
  box-shadow:var(--shadow);
  padding:1.75rem 2.25rem 2.25rem;
}

/* ---------- top bar ---------- */
.topbar{
  display:flex;justify-content:space-between;align-items:center;
  gap:1rem;flex-wrap:wrap;padding:.6rem 0 1.1rem;
  border-bottom:1px solid rgba(0,20,40,.06);
}
.brand{display:flex;align-items:baseline;gap:.5rem;text-decoration:none}
.brand h1{
  font-weight:700;font-size:1.75rem;letter-spacing:-.02em;
  background:linear-gradient(145deg,#0b2b4a,#1f5a8a);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.brand .company{font-weight:300;font-size:.9rem;color:#3e5f7a}
.brand .tagline{
  font-size:.7rem;letter-spacing:.09em;text-transform:uppercase;
  color:var(--muted-2);font-weight:600;
}
.topbar-right{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap}
.lang-switch{
  display:flex;gap:.25rem;align-items:center;background:var(--blue-100);
  padding:.2rem .35rem;border-radius:40px;
}
.lang-switch button{
  border:0;background:transparent;font-weight:600;font-size:.82rem;color:var(--blue-900);
  padding:.25rem .8rem;border-radius:30px;transition:.18s;
}
.lang-switch button.active{background:#fff;box-shadow:0 2px 8px rgba(0,20,30,.08)}
.cta-btn{
  display:inline-flex;align-items:center;gap:.45rem;text-decoration:none;
  background:var(--blue-700);color:#fff;font-weight:600;font-size:.85rem;
  padding:.5rem 1.15rem;border-radius:30px;transition:.18s;
  box-shadow:0 6px 16px -6px rgba(31,106,158,.5);
}
.cta-btn:hover{background:var(--blue-800);transform:translateY(-1px)}
.cta-btn.ghost{background:var(--blue-100);color:var(--blue-900);box-shadow:none}
.cta-btn.ghost:hover{background:var(--blue-50)}

/* ---------- main nav ---------- */
.mainnav{
  display:flex;flex-wrap:wrap;gap:.35rem;align-items:center;
  margin:1.1rem 0 0;padding-bottom:.7rem;border-bottom:2px solid #eaf0f6;
}
.mainnav a{
  text-decoration:none;color:#3e5f7a;font-weight:600;font-size:.9rem;
  padding:.55rem 1.05rem;border-radius:30px;transition:.18s;
  display:inline-flex;align-items:center;gap:.42rem;white-space:nowrap;
}
.mainnav a:hover{background:var(--blue-100)}
.mainnav a.active{background:var(--blue-700);color:#fff;box-shadow:0 4px 12px rgba(31,106,158,.25)}
.mainnav a .dot{
  width:6px;height:6px;border-radius:50%;background:currentColor;opacity:.45;
}
.mainnav .sep{width:1px;height:20px;background:var(--line-2);margin:0 .35rem}
.mainnav .group-label{
  font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--muted-2);font-weight:700;padding:.55rem .3rem .55rem .1rem;
}

/* ---------- breadcrumb ---------- */
.crumb{
  font-size:.8rem;color:var(--muted);margin:1.1rem 0 0;
  display:flex;align-items:center;gap:.45rem;flex-wrap:wrap;
}
.crumb a{color:var(--muted);text-decoration:none}
.crumb a:hover{color:var(--blue-700);text-decoration:underline}
.crumb .sep{opacity:.5}

/* ---------- hero ---------- */
.hero{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:2rem;padding:2.2rem 0 1.6rem;
}
.hero-text{flex:1 1 480px;min-width:320px}
.badge{
  display:inline-flex;align-items:center;gap:.45rem;
  background:var(--blue-50);color:#004080;font-weight:700;font-size:.68rem;
  letter-spacing:.06em;text-transform:uppercase;
  padding:.28rem 1rem;border-radius:30px;margin-bottom:.9rem;
}
.hero h2{
  font-size:clamp(1.75rem,3.4vw,2.6rem);font-weight:700;letter-spacing:-.02em;
  line-height:1.2;margin-bottom:.85rem;color:#07182a;
}
.hero h2 .hl{
  background:linear-gradient(145deg,#0d5a8f,#1f8fc0);
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.hero .lede{font-size:1.05rem;color:var(--ink-3);max-width:640px;margin-bottom:1.3rem}
.hero-actions{display:flex;gap:.6rem;flex-wrap:wrap}

.statrow{display:flex;gap:2.1rem;flex-wrap:wrap;margin-top:1.4rem}
.stat{display:flex;flex-direction:column}
.stat b{font-weight:700;font-size:1.65rem;color:var(--blue-900);line-height:1.15}
.stat span{font-size:.72rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}

/* ---------- cards & grids ---------- */
.grid{display:grid;gap:1.1rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}

.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:1.25rem 1.4rem;box-shadow:var(--shadow-sm);
}
.card.flat{box-shadow:none;border-radius:var(--radius-sm)}
.card.tint{background:#fbfdff}
.card h3{
  font-size:1.02rem;font-weight:700;color:var(--blue-900);
  margin-bottom:.55rem;display:flex;align-items:center;gap:.5rem;
}
.card h4{
  font-size:.92rem;font-weight:700;color:#003b66;
  margin-bottom:.5rem;display:flex;align-items:center;gap:.42rem;
}
.card p{font-size:.9rem;color:var(--ink-3)}
.card .sub{font-size:.82rem;color:var(--muted)}

/* product card */
.pcard{
  position:relative;overflow:hidden;
  background:linear-gradient(170deg,#ffffff 0%,#f7fbff 100%);
  border:1px solid var(--line);border-radius:var(--radius);
  padding:1.5rem;box-shadow:var(--shadow-sm);transition:.22s;
  display:flex;flex-direction:column;
}
.pcard:hover{transform:translateY(-3px);box-shadow:0 18px 40px -14px rgba(0,30,60,.22)}
.pcard .kicker{
  font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;
  font-weight:700;color:var(--blue-700);margin-bottom:.4rem;
}
.pcard h3{font-size:1.22rem;font-weight:700;color:#07182a;margin-bottom:.15rem}
.pcard .model{font-family:var(--mono);font-size:.8rem;color:var(--muted);margin-bottom:.7rem}
.pcard p{font-size:.88rem;color:var(--ink-3);flex:1}
.pcard .chips{display:flex;flex-wrap:wrap;gap:.35rem;margin-top:.9rem}
.pcard .more{
  margin-top:1rem;font-size:.85rem;font-weight:700;color:var(--blue-700);
  text-decoration:none;display:inline-flex;align-items:center;gap:.35rem;
}
.pcard .more:hover{gap:.6rem}
.pcard .glyph{
  position:absolute;right:1.1rem;top:1.1rem;font-size:2.4rem;opacity:.1;
}

.chip{
  display:inline-flex;align-items:center;gap:.3rem;
  background:var(--blue-100);color:var(--blue-900);
  font-size:.72rem;font-weight:600;padding:.22rem .62rem;border-radius:20px;
  white-space:nowrap;
}
.chip.teal{background:#e2f4f4;color:#0a6b6b}
.chip.green{background:var(--green-soft);color:var(--green)}
.chip.amber{background:var(--amber-soft);color:#a86a10}
.chip.rose{background:var(--rose-soft);color:var(--rose)}
.chip.violet{background:#f0ebfa;color:var(--violet)}
.chip.plain{background:#f1f5fa;color:var(--muted)}

/* ---------- section ---------- */
.sect{margin:2.4rem 0 0}
.sect-head{
  display:flex;align-items:baseline;justify-content:space-between;gap:1rem;
  flex-wrap:wrap;padding-bottom:.55rem;margin-bottom:1.1rem;
  border-bottom:1px solid var(--line);
}
.sect-head h2{
  font-size:1.3rem;font-weight:700;color:var(--blue-900);
  display:flex;align-items:center;gap:.55rem;letter-spacing:-.01em;
}
.sect-head h2 .num{
  font-family:var(--mono);font-size:.85rem;color:var(--blue-700);
  background:var(--blue-50);padding:.1rem .5rem;border-radius:6px;
}
.sect-head .note{font-size:.8rem;color:var(--muted)}
.eyebrow{
  font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;
  font-weight:700;color:var(--blue-700);margin-bottom:.3rem;
}

/* ---------- tables ---------- */
table.tbl{
  width:100%;border-collapse:collapse;font-size:.84rem;margin:.6rem 0;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  overflow:hidden;
}
table.tbl th{
  background:#f1f5fa;font-weight:700;color:var(--blue-900);
  text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--line);
  font-size:.78rem;letter-spacing:.01em;white-space:nowrap;
}
table.tbl td{
  padding:.55rem .8rem;border-bottom:1px solid #f2f6fa;
  vertical-align:top;color:var(--ink-3);
}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tr:hover td{background:#fafcff}
table.tbl td.mono,table.tbl th.mono{font-family:var(--mono);font-size:.79rem}
table.tbl td.c,table.tbl th.c{text-align:center;white-space:nowrap}
table.tbl .hi{color:var(--blue-900);font-weight:700}
.tbl-scroll{overflow-x:auto}

/* ---------- code ---------- */
pre.code{
  background:#0d1b26;color:#d7e6f2;border-radius:var(--radius-sm);
  padding:1rem 1.15rem;font-family:var(--mono);font-size:.78rem;
  line-height:1.65;overflow-x:auto;margin:.6rem 0;
}
pre.code .k{color:#7fd3ff}
pre.code .s{color:#a5e6a5}
pre.code .c{color:#6f8fa3;font-style:italic}
code.inl{
  background:#f1f5fa;color:#0b2b4a;font-family:var(--mono);
  font-size:.82em;padding:.1rem .38rem;border-radius:5px;
}

/* ---------- notes ---------- */
.note{
  background:var(--amber-soft);border-left:3px solid var(--amber);
  padding:.7rem 1rem;font-size:.85rem;color:#6b4a10;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:.8rem 0;
}
.warn{
  background:var(--rose-soft);border-left:3px solid var(--rose);
  padding:.7rem 1rem;font-size:.85rem;color:#7a2f14;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:.8rem 0;
}
.good{
  background:var(--green-soft);border-left:3px solid var(--green);
  padding:.7rem 1rem;font-size:.85rem;color:#12502a;
  border-radius:0 var(--radius-sm) var(--radius-sm) 0;margin:.8rem 0;
}
.note b,.warn b,.good b{font-weight:700}

/* ---------- lists ---------- */
ul.ticks{list-style:none;padding:0}
ul.ticks li{
  position:relative;padding-left:1.35rem;margin:.28rem 0;
  font-size:.87rem;color:var(--ink-3);
}
ul.ticks li::before{
  content:"";position:absolute;left:0;top:.55em;
  width:6px;height:6px;border-radius:50%;background:var(--blue-600);opacity:.65;
}
ul.ticks.check li::before{
  content:"\2713";background:none;color:var(--green);
  font-weight:700;font-size:.8rem;top:0;width:auto;height:auto;
}
ul.ticks.cross li::before{
  content:"\2717";background:none;color:var(--rose);
  font-weight:700;font-size:.85rem;top:0;width:auto;height:auto;
}

/* spec list */
ul.spec{list-style:none;padding:0}
ul.spec li{
  display:flex;gap:.7rem;padding:.36rem 0;border-bottom:1px dashed #eef3f8;
  font-size:.85rem;
}
ul.spec li:last-child{border-bottom:0}
ul.spec .lb{color:var(--muted);flex:0 0 40%;font-size:.83rem}
ul.spec .vl{color:var(--ink);font-weight:600;flex:1}

/* ---------- steps ---------- */
.steps{counter-reset:s;list-style:none;padding:0}
.steps li{
  counter-increment:s;position:relative;padding-left:2.6rem;
  margin:0 0 1rem;font-size:.88rem;color:var(--ink-3);
}
.steps li::before{
  content:counter(s);position:absolute;left:0;top:0;
  width:1.75rem;height:1.75rem;border-radius:50%;
  background:var(--blue-700);color:#fff;font-weight:700;font-size:.8rem;
  display:flex;align-items:center;justify-content:center;
}
.steps li b{color:var(--blue-900)}

/* ---------- product switcher (tab-like link row) ---------- */
.switcher{display:flex;flex-wrap:wrap;gap:.5rem;margin:0 0 1rem}
.switcher a{
  text-decoration:none;background:#eef2f6;color:#1f4b6e;
  padding:.4rem 1.15rem;border-radius:30px;font-weight:600;font-size:.83rem;
  transition:.18s;
}
.switcher a:hover{background:var(--blue-50)}
.switcher a.on{background:var(--blue-700);color:#fff}

/* ---------- pillar / foundation banner ---------- */
.pillars{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
  gap:1rem;margin:1.4rem 0 0;
}
.pillar{
  background:linear-gradient(165deg,#0d2a44,#16456c);
  color:#e8f2fb;border-radius:var(--radius);padding:1.3rem 1.35rem;
  box-shadow:0 14px 34px -16px rgba(4,26,46,.6);
}
.pillar .num{
  font-family:var(--mono);font-size:.72rem;color:#7fc4ef;letter-spacing:.1em;
}
.pillar h4{color:#fff;font-size:1rem;margin:.35rem 0 .4rem}
.pillar p{font-size:.83rem;color:#b8d4ea;line-height:1.6}

.foundation{
  background:radial-gradient(120% 140% at 10% 0%,#12456e 0%,#0a2338 60%,#08192a 100%);
  color:#dceaf6;border-radius:var(--radius);padding:1.8rem 1.9rem;
  box-shadow:0 22px 50px -20px rgba(4,26,46,.65);
  position:relative;overflow:hidden;
}
.foundation::after{
  content:"";position:absolute;right:-90px;top:-90px;width:320px;height:320px;
  border-radius:50%;background:radial-gradient(circle,rgba(63,163,224,.28),transparent 68%);
}
.foundation h3{color:#fff;font-size:1.25rem;margin-bottom:.35rem}
.foundation p{color:#b8d4ea;font-size:.88rem;max-width:760px}
.foundation .chips{margin-top:.9rem;display:flex;flex-wrap:wrap;gap:.4rem}
.foundation .chip{background:rgba(127,196,239,.15);color:#cbe6fa}
.foundation .modules{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(185px,1fr));
  gap:.7rem;margin-top:1.2rem;position:relative;z-index:1;
}
.foundation .mod{
  background:rgba(255,255,255,.07);border:1px solid rgba(127,196,239,.22);
  border-radius:var(--radius-sm);padding:.75rem .9rem;
}
.foundation .mod b{display:block;color:#fff;font-size:.86rem;margin-bottom:.18rem}
.foundation .mod span{font-size:.76rem;color:#a9c9e2;line-height:1.5}

/* ---------- flow diagram (pure CSS) ---------- */
.flow{
  display:flex;flex-wrap:wrap;align-items:stretch;gap:.6rem;
  margin:1rem 0;
}
.flow .box{
  flex:1 1 150px;background:#fbfdff;border:1px solid var(--line);
  border-radius:var(--radius-sm);padding:.8rem .85rem;min-width:130px;
}
.flow .box b{display:block;font-size:.84rem;color:var(--blue-900);margin-bottom:.2rem}
.flow .box span{font-size:.76rem;color:var(--muted);line-height:1.5}
.flow .arrow{
  display:flex;align-items:center;color:var(--blue-600);
  font-size:1.05rem;font-weight:700;flex:0 0 auto;
}

/* ---------- metrics ---------- */
.metrics{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.85rem;margin:.9rem 0}
.metric{
  background:#fbfdff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:.8rem .9rem;text-align:center;
}
.metric b{display:block;font-size:1.25rem;font-weight:700;color:var(--blue-900);line-height:1.2}
.metric span{font-size:.72rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}

/* ---------- matrix ratings ---------- */
.rate{font-weight:700;font-size:.82rem;letter-spacing:.02em;white-space:nowrap}
.rate.r3{color:var(--green)}
.rate.r2{color:#b07908}
.rate.r1{color:var(--muted)}
.rate.r0{color:#c0ccd6}

/* ---------- accordion ---------- */
details.acc{
  background:#fbfdff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:.8rem 1rem;margin:.5rem 0;
}
details.acc>summary{
  cursor:pointer;font-weight:700;font-size:.9rem;color:var(--blue-900);
  list-style:none;display:flex;align-items:center;justify-content:space-between;gap:.6rem;
}
details.acc>summary::-webkit-details-marker{display:none}
details.acc>summary::after{
  content:"+";font-family:var(--mono);font-size:1.1rem;color:var(--blue-600);font-weight:400;
}
details.acc[open]>summary::after{content:"\2013"}
details.acc .acc-body{padding-top:.7rem;font-size:.86rem;color:var(--ink-3)}

/* ---------- footer ---------- */
.sitefoot{
  margin-top:2.6rem;border-top:1px solid var(--line-2);padding-top:1.4rem;
  display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:1.4rem;
  font-size:.83rem;color:var(--muted);
}
.sitefoot h5{
  font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--blue-900);font-weight:700;margin-bottom:.5rem;
}
.sitefoot a{color:var(--muted);text-decoration:none;display:block;padding:.14rem 0}
.sitefoot a:hover{color:var(--blue-700)}
.sitefoot .legal{
  grid-column:1/-1;border-top:1px solid var(--line);padding-top:.9rem;
  font-size:.76rem;color:var(--muted-2);line-height:1.7;
}

/* ---------- responsive ---------- */
@media (max-width:900px){
  body{padding:.6rem}
  .shell{padding:1.2rem 1.15rem 1.6rem;border-radius:24px}
  .sitefoot{grid-template-columns:1fr 1fr}
  .hero{padding:1.5rem 0 1rem}
}
@media (max-width:620px){
  .sitefoot{grid-template-columns:1fr}
  .mainnav{gap:.25rem}
  .mainnav a{padding:.45rem .8rem;font-size:.83rem}
  ul.spec li{flex-direction:column;gap:.1rem}
  ul.spec .lb{flex:1 0 100%}
}

/* ---------- print ---------- */
@media print{
  body{background:#fff;padding:0}
  .shell{box-shadow:none;border-radius:0;padding:0}
  .topbar,.mainnav,.hero-actions,.lang-switch{display:none}
}