/* =========================================================
   AI Motion — Industrial Vision Platform
   Static site stylesheet
   ========================================================= */

:root{
  /* Brand */
  --navy-950:#06101D;
  --navy-900:#0A1829;
  --navy-800:#10233A;
  --navy-700:#193151;
  --navy-600:#264468;
  --accent:#2F7BF6;
  --accent-600:#1E63D6;
  --accent-300:#8DB6FA;
  --accent-soft:#EAF1FE;

  /* Neutrals (slightly blue-biased) */
  --ink:#0D1520;
  --graphite:#27313E;
  --text:#3A4553;
  --muted:#667384;
  --line:#E1E6ED;
  --line-strong:#CBD3DE;
  --bg:#FFFFFF;
  --bg-soft:#F4F6F9;
  --on-dark:#E8EEF6;
  --on-dark-muted:#9AAABF;
  --line-dark:rgba(232,238,246,.12);

  /* Semantic (used in vision mockups) */
  --ok:#1FA971;
  --danger:#E5484D;
  --warn:#F2A93B;
  --zone:#3B8BFF;

  /* Type */
  --f-sans:"IBM Plex Sans","Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  /* Layout */
  --container:1200px;
  --gutter:24px;
  --header-h:68px;
  --radius:8px;
  --radius-lg:12px;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;
  font-family:var(--f-sans);
  font-size:16px;
  line-height:1.7;
  color:var(--text);
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{max-width:100%;display:block}
[hidden]{display:none!important}
a{color:inherit}
h1,h2,h3,h4{margin:0;color:var(--ink);line-height:1.2;text-wrap:balance;font-weight:600}
p{margin:0}
ul{margin:0;padding:0}
button{font:inherit}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:4px}
section[id]{scroll-margin-top:calc(var(--header-h) + 8px)}

.container{max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.skip-link{position:absolute;left:-9999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:6px;z-index:100}
.skip-link:focus{left:16px}
.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

/* ---------- Type helpers ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--f-mono);font-size:12.5px;font-weight:500;
  letter-spacing:.12em;text-transform:uppercase;color:var(--accent-600);
}
.eyebrow::before{content:"";width:18px;height:1px;background:currentColor}
.section-head{max-width:760px;margin-bottom:56px}
.section-head h2{font-size:clamp(28px,3.4vw,42px);letter-spacing:-.015em;margin-top:16px}
.section-head p{margin-top:18px;font-size:17.5px;color:var(--muted);max-width:640px}
.section-head--split{max-width:none;display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:end}
.section-head--split p{margin-top:0}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  height:48px;padding:0 22px;border-radius:6px;border:1px solid transparent;
  font-size:15px;font-weight:500;text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:background-color .2s,border-color .2s,color .2s,transform .2s;
}
.btn svg{width:16px;height:16px;transition:transform .2s}
.btn:hover svg{transform:translateX(3px)}
.btn--primary{background:var(--accent);color:#fff}
.btn--primary:hover{background:var(--accent-600)}
.btn--ghost-dark{border-color:rgba(232,238,246,.28);color:var(--on-dark)}
.btn--ghost-dark:hover{border-color:var(--on-dark);background:rgba(255,255,255,.04)}
.btn--ghost{border-color:var(--line-strong);color:var(--ink);background:#fff}
.btn--ghost:hover{border-color:var(--ink)}
.btn--sm{height:40px;padding:0 16px;font-size:14px}
.link-arrow{
  display:inline-flex;align-items:center;gap:8px;font-weight:500;font-size:15px;
  text-decoration:none;color:var(--accent-600)
}
.link-arrow svg{width:16px;height:16px;transition:transform .2s}
.link-arrow:hover svg{transform:translateX(3px)}

/* ---------- Header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:50;
  height:calc(var(--header-h) + env(safe-area-inset-top,0px));
  padding-top:env(safe-area-inset-top,0px);
  background:rgba(6,16,29,.72);
  backdrop-filter:saturate(140%) blur(12px);-webkit-backdrop-filter:saturate(140%) blur(12px);
  border-bottom:1px solid transparent;
  transition:background-color .25s,border-color .25s;
}
.site-header.is-scrolled{background:rgba(6,16,29,.94);border-bottom-color:var(--line-dark)}
.header-inner{height:var(--header-h);display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:#fff}
.brand-mark{width:30px;height:30px;flex:none}
.brand-name{white-space:nowrap;font-weight:600;font-size:18px;letter-spacing:.01em}
.brand-name span{color:var(--accent-300);font-weight:500}
.nav{display:flex;align-items:center;gap:4px}
.nav a{
  white-space:nowrap;
  color:var(--on-dark-muted);text-decoration:none;font-size:14.5px;padding:8px 12px;border-radius:6px;
  transition:color .2s,background-color .2s;
}
.nav a:hover{color:#fff}
.nav a.is-active{color:#fff;background:rgba(255,255,255,.06)}
.header-cta{display:flex;align-items:center;gap:12px}
.nav-toggle{
  display:none;width:42px;height:42px;border-radius:6px;border:1px solid var(--line-dark);
  background:transparent;color:#fff;cursor:pointer;align-items:center;justify-content:center
}
.nav-toggle svg{width:20px;height:20px}

/* ---------- Hero ---------- */
.hero{
  position:relative;background:var(--navy-950);color:var(--on-dark);
  padding-top:calc(var(--header-h) + env(safe-area-inset-top,0px) + 72px);padding-bottom:96px;overflow:hidden;
}
.hero::before{ /* engineering grid, very faint */
  content:"";position:absolute;inset:0;
  background-image:
    linear-gradient(rgba(141,182,250,.05) 1px,transparent 1px),
    linear-gradient(90deg,rgba(141,182,250,.05) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.6) 60%,transparent 100%);
  -webkit-mask-image:linear-gradient(180deg,#000 0%,rgba(0,0,0,.6) 60%,transparent 100%);
  pointer-events:none;
}
.hero .container{position:relative}
.hero-copy{max-width:760px}
.hero .eyebrow{color:var(--accent-300)}
.hero h1{
  color:#fff;font-size:clamp(38px,5.6vw,72px);font-weight:600;letter-spacing:-.01em;line-height:1.1;margin-top:22px
}
.hero-tagline{
  display:block;font-size:clamp(22px,2.6vw,32px);font-weight:400;letter-spacing:-.01em;
  color:var(--on-dark);margin-top:14px;line-height:1.25
}
.hero-sub{margin-top:26px;font-size:18px;color:var(--on-dark-muted);max-width:560px}
.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:36px}
.hero-meta{display:flex;flex-wrap:wrap;gap:8px 28px;margin-top:40px;font-size:13.5px;color:var(--on-dark-muted)}
.hero-meta span{display:inline-flex;align-items:center;gap:8px}
.hero-meta span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}

/* Product window (hero visual) */
.product-window{
  margin-top:64px;border:1px solid var(--line-dark);border-radius:var(--radius-lg);
  background:var(--navy-900);overflow:hidden;
  box-shadow:0 40px 80px -40px rgba(0,0,0,.6);
}
.pw-bar{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:12px 18px;border-bottom:1px solid var(--line-dark);font-size:13px;color:var(--on-dark-muted)
}
.pw-crumbs{display:flex;align-items:center;gap:10px;min-width:0;overflow:hidden;white-space:nowrap}
.pw-crumbs strong{color:var(--on-dark);font-weight:500}
.pw-crumbs i{font-style:normal;opacity:.5}
.pw-live{display:inline-flex;align-items:center;gap:8px;font-family:var(--f-mono);font-size:12px;color:var(--on-dark)}
.pw-live::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--ok);box-shadow:0 0 0 3px rgba(31,169,113,.2)}
.pw-body{display:grid;grid-template-columns:1fr 300px}
.pw-canvas{position:relative;background:#0C1C30;border-right:1px solid var(--line-dark)}
.pw-canvas svg{width:100%;height:auto}
.pw-rail{padding:18px;display:flex;flex-direction:column;gap:14px}
.pw-rail h3{font-size:12px;font-family:var(--f-mono);font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--on-dark-muted)}
.event{
  border:1px solid var(--line-dark);border-radius:8px;padding:12px 14px;background:rgba(255,255,255,.02);
  display:grid;grid-template-columns:10px 1fr;gap:4px 10px;font-size:13px;color:var(--on-dark-muted)
}
.event::before{content:"";width:8px;height:8px;border-radius:2px;margin-top:6px;background:var(--dot,var(--on-dark-muted));grid-row:span 2}
.event strong{color:var(--on-dark);font-weight:500;font-size:13.5px}
.event time{font-family:var(--f-mono);font-size:12px}
.event--danger{--dot:var(--danger);border-color:rgba(229,72,77,.4);background:rgba(229,72,77,.06)}
.event--zone{--dot:var(--zone)}
.pw-stats{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:auto}
.pw-stats div{border-top:1px solid var(--line-dark);padding-top:10px}
.pw-stats dt{font-size:11.5px;color:var(--on-dark-muted)}
.pw-stats dd{margin:2px 0 0;font-family:var(--f-mono);color:var(--on-dark);font-size:15px}
.pw-caption{font-size:12.5px;color:var(--on-dark-muted);margin-top:14px}

/* Hero animation — the unauthorized person walks into the restricted zone */
@media (prefers-reduced-motion:no-preference){
  .walker{animation:walk 9s ease-in-out infinite}
  .walker .tag-auth{animation:tag-safe 9s steps(1,end) infinite}
  .walker .tag-unauth{animation:tag-alert 9s steps(1,end) infinite}
  .event--danger{animation:event-in 9s ease infinite}
}
@keyframes walk{0%,8%{transform:translateX(170px)}45%,92%{transform:translateX(0)}100%{transform:translateX(170px)}}
@keyframes tag-safe{0%{opacity:1}40%{opacity:0}95%{opacity:1}}
@keyframes tag-alert{0%{opacity:0}40%{opacity:1}95%{opacity:0}}
@keyframes event-in{0%,40%{opacity:.35}46%,92%{opacity:1}100%{opacity:.35}}

/* ---------- Generic sections ---------- */
.section{padding-block:120px}
.section--soft{background:var(--bg-soft)}
.section--dark{background:var(--navy-950);color:var(--on-dark)}
.section--dark h2,.section--dark h3{color:#fff}
.section--dark .section-head p{color:var(--on-dark-muted)}
.section--dark .eyebrow{color:var(--accent-300)}

/* ---------- Challenges ---------- */
.challenges{display:grid;grid-template-columns:repeat(5,1fr);border-top:1px solid var(--line);}
.challenge{padding:28px 24px 8px 0;border-right:1px solid var(--line);}
.challenge + .challenge{padding-left:24px}
.challenge:last-child{border-right:0}
.challenge .ico{width:40px;height:40px;color:var(--accent-600);margin-bottom:22px}
.challenge h3{font-size:17px;font-weight:600;line-height:1.45}
.challenge p{margin-top:10px;font-size:14.5px;color:var(--muted)}
.pivot{
  margin-top:72px;padding:40px 44px;border-radius:var(--radius-lg);
  background:var(--navy-900);color:#fff;display:grid;grid-template-columns:auto 1fr;gap:28px;align-items:center
}
.pivot .ico{width:52px;height:52px;color:var(--accent-300)}
.pivot p{font-size:clamp(20px,2.3vw,28px);font-weight:500;letter-spacing:-.01em;line-height:1.35}
.pivot small{display:block;margin-top:8px;font-size:15.5px;font-weight:400;color:var(--on-dark-muted);letter-spacing:0}

/* ---------- Solutions ---------- */
.solutions-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.sol-card{
  position:relative;border-radius:var(--radius-lg);padding:40px;display:flex;flex-direction:column;gap:24px;
  border:1px solid var(--line);background:#fff;
}
.sol-card--a{border-top:3px solid var(--accent)}
.sol-card--b{background:var(--navy-900);border-color:var(--navy-900);color:var(--on-dark);border-top:3px solid var(--accent-300)}
.sol-card--b h3{color:#fff}
.sol-label{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.sol-kicker{font-family:var(--f-mono);font-size:12.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--accent-600)}
.sol-card--b .sol-kicker{color:var(--accent-300)}
.sol-badge{font-size:12.5px;padding:4px 10px;border-radius:999px;border:1px solid var(--line-strong);color:var(--graphite)}
.sol-card--b .sol-badge{border-color:var(--line-dark);color:var(--on-dark)}
.sol-card h3{font-size:clamp(26px,2.6vw,32px);letter-spacing:-.015em}
.sol-card h3 small{display:block;font-size:16px;font-weight:400;color:var(--muted);margin-top:8px;letter-spacing:0}
.sol-card--b h3 small{color:var(--on-dark-muted)}
.sol-pos{display:flex;flex-wrap:wrap;gap:8px}
.sol-pos li{list-style:none;font-size:13px;font-family:var(--f-mono);padding:4px 10px;border-radius:4px;background:var(--accent-soft);color:var(--accent-600)}
.sol-card--b .sol-pos li{background:rgba(141,182,250,.12);color:var(--accent-300)}
.sol-list{display:grid;gap:0;border-top:1px solid var(--line)}
.sol-card--b .sol-list{border-color:var(--line-dark)}
.sol-list li{list-style:none;display:flex;align-items:center;gap:12px;padding:14px 0;border-bottom:1px solid var(--line);font-weight:500;color:var(--ink)}
.sol-card--b .sol-list li{border-color:var(--line-dark);color:var(--on-dark)}
.sol-list li svg{width:18px;height:18px;flex:none;color:var(--accent)}
.sol-card--b .sol-list li svg{color:var(--accent-300)}
.sol-list li span{font-weight:400;color:var(--muted);font-size:14px;margin-left:auto;text-align:right}
.sol-card--b .sol-list li span{color:var(--on-dark-muted)}
.sol-value{font-size:15px;color:var(--muted)}
.sol-value strong{color:var(--ink);font-weight:600}
.sol-card--b .sol-value{color:var(--on-dark-muted)}
.sol-card--b .sol-value strong{color:#fff}
.sol-card .link-arrow{margin-top:auto}
.sol-card--b .link-arrow{color:var(--accent-300)}
.platform-band{
  margin-top:24px;border:1px dashed var(--line-strong);border-radius:var(--radius-lg);
  padding:18px 24px;display:flex;flex-wrap:wrap;align-items:center;gap:10px 24px;font-size:14.5px;color:var(--muted)
}
.platform-band strong{color:var(--ink);font-weight:600}
.platform-band ul{display:flex;flex-wrap:wrap;gap:8px}
.platform-band li{list-style:none;font-family:var(--f-mono);font-size:12.5px;padding:3px 9px;border-radius:4px;background:var(--bg-soft);color:var(--graphite)}

/* Solution detail */
.detail{padding-block:96px;border-top:1px solid var(--line)}
.detail-grid{display:grid;grid-template-columns:5fr 7fr;gap:64px;align-items:start}
.detail-intro h3{font-size:clamp(26px,2.8vw,34px);letter-spacing:-.015em;margin-top:14px}
.detail-intro > p{margin-top:16px;color:var(--muted);font-size:16.5px}
.detail-intro .quote{
  margin-top:28px;padding:20px 22px;border-left:2px solid var(--accent);background:var(--accent-soft);
  color:var(--ink);font-weight:500;border-radius:0 6px 6px 0
}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.chips li{list-style:none;font-size:13.5px;padding:6px 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--graphite)}
.chips-label{margin-top:32px;font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.apps{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.app{background:#fff;padding:28px}
.app--wide{grid-column:1/-1}
.app-code{font-family:var(--f-mono);font-size:12px;color:var(--accent-600);letter-spacing:.06em}
.app h4{font-size:18px;margin-top:8px}
.app h4 small{display:block;font-size:14px;font-weight:400;color:var(--muted);margin-top:4px}
.app ul{margin-top:14px;display:grid;gap:8px}
.app li{list-style:none;position:relative;padding-left:18px;font-size:14.5px;color:var(--text)}
.app li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--accent)}
.app .note{margin-top:12px;font-size:12.5px;color:var(--muted)}

/* SOP case */
.case{display:grid;grid-template-columns:7fr 5fr;gap:0;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:#fff}
.case-visual{background:var(--navy-900);position:relative}
.case-visual svg{width:100%;height:auto}
.case-steps{padding:28px}
.case-steps h4{font-size:15px;display:flex;justify-content:space-between;align-items:center;gap:12px}
.result{font-family:var(--f-mono);font-size:12px;padding:4px 9px;border-radius:4px;background:rgba(229,72,77,.1);color:#B4262B;font-weight:500;white-space:nowrap}
.steps-list{margin-top:18px;padding:0;display:grid;gap:0;counter-reset:step}
.steps-list li{
  list-style:none;display:grid;grid-template-columns:28px 1fr auto;gap:12px;align-items:center;
  padding:12px 0;border-top:1px solid var(--line);font-size:14.5px;color:var(--ink)
}
.steps-list li::before{counter-increment:step;content:counter(step,decimal-leading-zero);font-family:var(--f-mono);font-size:12px;color:var(--muted)}
.st{font-family:var(--f-mono);font-size:11.5px;padding:2px 8px;border-radius:4px;white-space:nowrap}
.st--ok{background:rgba(31,169,113,.12);color:#12774F}
.st--run{background:var(--accent-soft);color:var(--accent-600)}
.st--miss{background:rgba(229,72,77,.12);color:#B4262B}
.st--wait{background:var(--bg-soft);color:var(--muted)}
.case-foot{margin-top:18px;font-size:12.5px;color:var(--muted)}
.caps-b{margin-top:24px;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden}
.caps-b div{background:#fff;padding:22px 24px}
.caps-b b{display:block;color:var(--ink);font-weight:600;font-size:15.5px}
.caps-b p{margin-top:6px;font-size:14px;color:var(--muted)}
.caps-b .app-code{display:block;margin-bottom:6px}

/* ---------- How it works ---------- */
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative}
.flow-step{position:relative;padding:0 20px 0 0}
.flow-node{
  display:flex;align-items:center;gap:12px;height:64px;padding:0 18px;border-radius:var(--radius);
  border:1px solid var(--line-dark);background:var(--navy-900);color:#fff;font-weight:500;position:relative
}
.flow-node svg{width:22px;height:22px;color:var(--accent-300);flex:none}
.flow-step:not(:last-child) .flow-node::after{
  content:"";position:absolute;right:-21px;top:50%;width:21px;height:1px;background:var(--accent-300);opacity:.6
}
.flow-step:not(:last-child) .flow-node::before{
  content:"";position:absolute;right:-21px;top:calc(50% - 4px);border:4px solid transparent;border-left:6px solid var(--accent-300);border-right:0;opacity:.8;transform:translateX(6px)
}
.flow-step:last-child .flow-node{background:var(--accent);border-color:var(--accent)}
.flow-step:last-child .flow-node svg{color:#fff}
.flow-step .code{display:block;margin-top:18px;font-family:var(--f-mono);font-size:12px;color:var(--on-dark-muted)}
.flow-step h3{font-size:16px;margin-top:6px}
.flow-step p{margin-top:8px;font-size:14px;color:var(--on-dark-muted)}
.hw-note{
  margin-top:56px;padding:22px 26px;border:1px solid var(--line-dark);border-radius:var(--radius);
  display:grid;grid-template-columns:auto 1fr;gap:18px;align-items:start;color:var(--on-dark-muted);font-size:15px
}
.hw-note svg{width:24px;height:24px;color:var(--accent-300);margin-top:2px}
.hw-note strong{color:#fff;font-weight:500;display:block;margin-bottom:4px}

/* ---------- Capabilities ---------- */
.caps{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.cap{
  border:1px solid var(--line);border-radius:var(--radius);padding:24px 22px;background:#fff;
  transition:border-color .2s,transform .2s,box-shadow .2s;display:flex;flex-direction:column
}
.cap:hover{border-color:var(--accent-300);transform:translateY(-2px);box-shadow:0 14px 30px -20px rgba(16,35,58,.35)}
.cap .ico{width:34px;height:34px;color:var(--accent-600)}
.cap h3{font-size:16px;margin-top:20px}
.cap p{font-size:14px;color:var(--muted);margin-top:8px;flex:1}
.cap .uses{display:flex;gap:6px;margin-top:18px}
.cap .uses span{font-family:var(--f-mono);font-size:11px;padding:2px 7px;border-radius:3px;border:1px solid var(--line);color:var(--muted)}
.cap .uses span.on{border-color:transparent;background:var(--accent-soft);color:var(--accent-600)}
.caps-legend{margin-top:22px;display:flex;flex-wrap:wrap;gap:8px 24px;font-size:13px;color:var(--muted)}
.caps-legend span b{font-family:var(--f-mono);font-weight:500;color:var(--accent-600);margin-right:6px}

/* ---------- Use cases ---------- */
.usecases{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.uc{border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:#fff;display:flex;flex-direction:column}
.uc-visual{background:var(--navy-900);aspect-ratio:16/8;max-width:100%}
.uc-visual svg{width:100%;height:100%}
.uc-body{padding:26px 28px 28px}
.uc-top{display:flex;align-items:center;justify-content:space-between;gap:12px}
.uc-body h3{font-size:20px}
.uc-tag{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.06em;color:var(--muted);white-space:nowrap}
.uc-body p{margin-top:10px;color:var(--muted);font-size:15px}
.uc-body dl{margin:18px 0 0;display:grid;grid-template-columns:auto 1fr;gap:6px 16px;font-size:14px}
.uc-body dt{color:var(--muted)}
.uc-body dd{margin:0;color:var(--ink)}

/* ---------- Architecture ---------- */
.arch{
  border:1px solid var(--line);border-radius:var(--radius-lg);background:#fff;padding:36px;
}
.arch-flow{display:grid;grid-template-columns:1fr 1.25fr 1fr 1.25fr 1fr;gap:28px;align-items:stretch}
.arch-col{position:relative;display:flex;flex-direction:column;gap:10px}
.arch-col:not(:last-child)::after{
  content:"";position:absolute;right:-22px;top:50%;width:16px;height:16px;
  background:no-repeat center/16px url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='none' stroke='%232F7BF6' stroke-width='1.6'%3E%3Cpath d='M2 8h11M9 4l4 4-4 4'/%3E%3C/svg%3E");
  transform:translateY(-50%)
}
.arch-layer{font-family:var(--f-mono);font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
.arch-box{border:1px solid var(--line-strong);border-radius:var(--radius);padding:16px;background:#fff;flex:1;display:flex;flex-direction:column;gap:10px}
.arch-box h3{font-size:15.5px;display:flex;align-items:center;gap:10px}
.arch-box h3 svg{width:20px;height:20px;color:var(--accent-600);flex:none}
.arch-box--core{background:var(--navy-900);border-color:var(--navy-900)}
.arch-box--core h3{color:#fff}
.arch-box--core h3 svg{color:var(--accent-300)}
.arch-items{display:grid;gap:6px}
.arch-items li{list-style:none;font-size:13px;line-height:1.45;padding:7px 10px;border-radius:5px;background:var(--bg-soft);color:var(--graphite)}
.arch-items li em{display:block;margin-top:1px;font-style:normal;font-family:var(--f-mono);font-size:11px;color:var(--muted)}
.arch-box--core .arch-items li{background:rgba(255,255,255,.06);color:var(--on-dark)}
.arch-box--core .arch-items li em{color:var(--on-dark-muted)}
.arch-box--accent{border-color:var(--accent);box-shadow:inset 0 0 0 1px var(--accent)}
.arch-base{margin-top:28px;display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.arch-base div{border:1px dashed var(--line-strong);border-radius:var(--radius);padding:14px 16px;font-size:13.5px;color:var(--muted)}
.arch-base b{display:block;color:var(--ink);font-weight:600;font-size:14px;margin-bottom:2px}

/* ---------- Why ---------- */
.why{display:grid;grid-template-columns:repeat(4,1fr);gap:0;border-top:1px solid var(--ink)}
.why-item{padding:32px 28px 0 0}
.why-item + .why-item{padding-left:28px;border-left:1px solid var(--line)}
.why-item .en{font-size:28px;font-weight:600;color:var(--ink);letter-spacing:-.015em}
.why-item .zh{font-family:var(--f-mono);font-size:12px;letter-spacing:.1em;color:var(--accent-600);margin-top:4px;display:block}
.why-item p{margin-top:18px;color:var(--text);font-size:15.5px}
.why-item ul{margin-top:18px;display:grid;gap:6px}
.why-item li{list-style:none;font-size:14px;color:var(--muted);padding-left:16px;position:relative}
.why-item li::before{content:"";position:absolute;left:0;top:.75em;width:6px;height:1px;background:var(--muted)}

/* ---------- CTA + Contact ---------- */
.cta{background:var(--navy-950);color:var(--on-dark);padding-block:120px;position:relative;overflow:hidden}
.cta::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(141,182,250,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(141,182,250,.05) 1px,transparent 1px);
  background-size:56px 56px;pointer-events:none;
  mask-image:radial-gradient(ellipse at 20% 40%,#000 0%,transparent 70%);
  -webkit-mask-image:radial-gradient(ellipse at 20% 40%,#000 0%,transparent 70%);
}
.cta .container{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:start}
.cta h2{color:#fff;font-size:clamp(32px,4vw,52px);letter-spacing:-.025em;line-height:1.08}
.cta-sub{margin-top:22px;font-size:18px;color:var(--on-dark-muted);max-width:480px}
.cta-points{margin-top:36px;display:grid;gap:14px}
.cta-points li{list-style:none;display:flex;gap:12px;align-items:flex-start;font-size:15px;color:var(--on-dark)}
.cta-points svg{width:18px;height:18px;color:var(--accent-300);flex:none;margin-top:4px}

.form{background:#fff;color:var(--text);border-radius:var(--radius-lg);padding:32px;display:grid;gap:18px}
.form h3{font-size:20px}
.form .form-sub{font-size:14px;color:var(--muted);margin-top:-8px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.field{display:grid;gap:6px}
.field label{font-size:13.5px;font-weight:500;color:var(--ink)}
.field label .opt{font-weight:400;color:var(--muted)}
.field input,.field select,.field textarea{
  font:inherit;font-size:15px;width:100%;padding:11px 12px;border:1px solid var(--line-strong);border-radius:6px;
  background:#fff;color:var(--ink);transition:border-color .2s,box-shadow .2s
}
.field textarea{min-height:104px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(47,123,246,.18)}
.field.invalid input,.field.invalid select{border-color:var(--danger)}
.field .err{font-size:12.5px;color:#B4262B;display:none}
.field.invalid .err{display:block}
.form .btn{width:100%}
.form-status{font-size:14px;padding:12px 14px;border-radius:6px;background:var(--bg-soft);color:var(--graphite)}
.form-status.ok{background:rgba(31,169,113,.1);color:#12774F}
.form-note{font-size:12.5px;color:var(--muted)}

/* ---------- Footer ---------- */
.footer{background:var(--navy-950);color:var(--on-dark-muted);border-top:1px solid var(--line-dark);padding-block:48px calc(40px + env(safe-area-inset-bottom,0px));font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer .brand{margin-bottom:14px}
.footer h4{color:#fff;font-size:13px;font-family:var(--f-mono);font-weight:500;letter-spacing:.1em;text-transform:uppercase;margin-bottom:14px}
.footer ul{display:grid;gap:8px}
.footer li{list-style:none}
.footer a{text-decoration:none;color:var(--on-dark-muted)}
.footer a:hover{color:#fff}
.footer-bottom{margin-top:40px;padding-top:20px;border-top:1px solid var(--line-dark);display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;font-size:12.5px}

/* ---------- Reveal (content is visible at rest; motion only nudges) ---------- */
@media (prefers-reduced-motion:no-preference){
  .js .reveal{transform:translateY(14px);transition:transform .7s cubic-bezier(.2,.7,.2,1)}
  .js .reveal.is-in{transform:none}
}


/* ---------- Company mark ---------- */
.by-company{
  display:inline-flex;align-items:center;gap:8px;margin-right:auto;margin-left:4px;padding-left:16px;
  border-left:1px solid var(--line-dark);color:var(--on-dark-muted);font-size:13.5px;white-space:nowrap
}
.by-company img{width:18px;height:18px}
.footer-company{display:flex;align-items:center;gap:10px;margin-top:16px;color:var(--on-dark)}
.footer-company img{width:22px;height:22px}

/* ---------- Product interface ---------- */
.ui-tabs{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.ui-tabs button{
  display:inline-flex;align-items:baseline;gap:8px;cursor:pointer;
  padding:10px 18px;border-radius:6px;border:1px solid var(--line-strong);background:#fff;color:var(--ink);
  font-size:15px;font-weight:500;transition:border-color .2s,background-color .2s,color .2s
}
.ui-tabs button small{font-family:var(--f-mono);font-size:11.5px;color:var(--muted);font-weight:400}
.ui-tabs button:hover{border-color:var(--ink)}
.ui-tabs button[aria-selected="true"]{background:var(--navy-900);border-color:var(--navy-900);color:#fff}
.ui-tabs button[aria-selected="true"] small{color:var(--accent-300)}
.ui-panel{display:grid;grid-template-columns:minmax(0,8.5fr) minmax(0,3.5fr);gap:32px;align-items:start}
.ui-frame{margin:0;border:1px solid var(--line-strong);border-radius:var(--radius-lg);overflow:hidden;background:#fff;box-shadow:0 30px 60px -40px rgba(10,24,41,.45)}
.ui-frame-bar{display:flex;align-items:center;gap:6px;padding:10px 14px;border-bottom:1px solid var(--line);background:var(--bg-soft)}
.ui-frame-bar span{width:9px;height:9px;border-radius:50%;background:var(--line-strong)}
.ui-frame-bar em{font-style:normal;font-size:12.5px;color:var(--muted);margin-left:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.ui-frame img{width:100%;height:auto}
.ui-notes{padding-top:8px}
.ui-notes h3{font-size:22px}
.ui-notes p{margin-top:12px;color:var(--muted);font-size:15.5px}
.ui-notes ul{margin-top:20px;display:grid;gap:0;border-top:1px solid var(--line)}
.ui-notes li{list-style:none;display:flex;gap:10px;padding:11px 0;border-bottom:1px solid var(--line);font-size:14.5px;color:var(--ink)}
.ui-notes li::before{content:"";flex:none;width:6px;height:6px;margin-top:.62em;border-radius:1px;background:var(--accent)}
.ui-live{
  border:1px dashed var(--line-strong);border-radius:var(--radius-lg);background:var(--bg-soft);
  padding:56px 40px;display:flex;flex-direction:column;align-items:flex-start;gap:14px;min-height:360px;justify-content:center
}
.ui-live .ico{width:36px;height:36px;color:var(--accent-600)}
.ui-live h3{font-size:22px}
.ui-live p{color:var(--muted);max-width:560px}
.ui-live .btn{margin-top:8px}
.demo-access{
  margin-top:40px;padding:26px 30px;border-radius:var(--radius-lg);background:var(--navy-900);color:var(--on-dark);
  display:flex;align-items:center;justify-content:space-between;gap:24px
}
.demo-access strong{color:#fff;font-size:18px;font-weight:600}
.demo-access p{margin-top:6px;color:var(--on-dark-muted);font-size:15px;max-width:640px}
@media (max-width:1180px){
  .nav,.header-cta .btn{display:none}
  .nav-toggle{display:inline-flex}
  .nav.is-open{
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    position:fixed;left:0;right:0;top:calc(var(--header-h) + env(safe-area-inset-top,0px));
    background:var(--navy-950);border-bottom:1px solid var(--line-dark);padding:8px var(--gutter) 20px
  }
  .nav.is-open a{padding:14px 4px;border-bottom:1px solid var(--line-dark);border-radius:0;font-size:16px}
  .nav.is-open a.is-active{background:transparent}
  .nav.is-open .nav-mobile-cta{display:flex;margin-top:16px}
}
@media (max-width:1080px){
  .ui-panel{grid-template-columns:1fr;gap:24px}
}
@media (max-width:600px){
  .by-company{display:none}
  .ui-tabs button{flex:1 1 calc(50% - 8px);justify-content:center;padding:10px 8px}
  .ui-tabs button small{display:none}
  .ui-live{padding:32px 22px;min-height:0}
  .demo-access{flex-direction:column;align-items:flex-start;padding:22px}
  .demo-access .btn{width:100%}
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width:1180px){
  .nav a{padding:8px 9px;font-size:14px}
  .caps{grid-template-columns:repeat(4,1fr)}
}
@media (max-width:1080px){
  .pw-body{grid-template-columns:1fr}
  .pw-canvas{border-right:0;border-bottom:1px solid var(--line-dark)}
  .pw-rail{display:grid;grid-template-columns:repeat(3,1fr);align-items:start}
  .pw-rail h3,.pw-stats{grid-column:1/-1}
  .challenges{grid-template-columns:repeat(3,1fr)}
  .challenge{padding:28px 24px 28px 0!important;border-right:0;border-bottom:1px solid var(--line)}
  .challenge:nth-child(3n+2),.challenge:nth-child(3n){padding-left:24px!important;border-left:1px solid var(--line)}
  .detail-grid{grid-template-columns:1fr;gap:40px}
  .case{grid-template-columns:1fr}
  .flow{grid-template-columns:1fr;gap:12px}
  .flow-step{display:grid;grid-template-columns:260px 1fr;gap:4px 24px;align-items:center;padding:0}
  .flow-step .code{margin-top:0;grid-column:2}
  .flow-step h3{display:none}
  .flow-step p{margin-top:0;grid-column:2}
  .flow-node{grid-row:span 2}
  .flow-step:not(:last-child) .flow-node::after{right:auto;left:28px;top:auto;bottom:-13px;width:1px;height:12px}
  .flow-step:not(:last-child) .flow-node::before{display:none}
  .caps{grid-template-columns:repeat(3,1fr)}
  .arch-flow{grid-template-columns:1fr;gap:34px}
  .arch-col:not(:last-child)::after{right:auto;left:50%;top:auto;bottom:-26px;transform:translateX(-50%) rotate(90deg)}
  .why{grid-template-columns:1fr 1fr}
  .why-item{padding:32px 28px 32px 0!important;border-left:0!important;border-bottom:1px solid var(--line)}
  .why-item:nth-child(2n){padding-left:28px!important;border-left:1px solid var(--line)!important}
  .cta .container{grid-template-columns:1fr;gap:48px}
  .section-head--split{grid-template-columns:1fr;gap:0}
  .section-head--split p{margin-top:18px}
}
.nav-mobile-cta{display:none}
@media (max-width:820px){
  .section{padding-block:88px}
  .solutions-grid,.usecases{grid-template-columns:1fr}
  .apps{grid-template-columns:1fr}
  .caps-b{grid-template-columns:1fr 1fr}
  .pw-rail{grid-template-columns:1fr}
  .pw-rail .event:nth-of-type(n+3){display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-grid > div:first-child{grid-column:1/-1}
  .arch-base{grid-template-columns:1fr}
  .challenges{grid-template-columns:1fr 1fr}
  .challenges .challenge:nth-child(n){padding-left:0!important;border-left:0!important}
  .challenges .challenge:nth-child(2n){padding-left:24px!important;border-left:1px solid var(--line)!important}
}
@media (max-width:600px){
  :root{--gutter:16px;--header-h:60px}
  body{font-size:15.5px}
  .hero{padding-top:calc(var(--header-h) + env(safe-area-inset-top,0px) + 48px);padding-bottom:64px}
  .hero-sub{font-size:16.5px}
  .hero-actions .btn{flex:1 1 auto}
  .product-window{margin-top:44px}
  .pw-bar .pw-crumbs i,.pw-bar .pw-crumbs .hide-sm{display:none}
  .section{padding-block:72px}
  .section-head{margin-bottom:40px}
  .challenges{grid-template-columns:1fr}
  .challenges .challenge:nth-child(n){padding:24px 0!important;border-left:0!important}
  .pivot{grid-template-columns:1fr;padding:28px 24px;gap:16px}
  .sol-card{padding:28px 22px}
  .sol-list li span{display:none}
  .detail{padding-block:72px}
  .app{padding:22px}
  .caps-b{grid-template-columns:1fr}
  .flow-step{grid-template-columns:1fr}
  .flow-node{grid-row:auto}
  .flow-step .code,.flow-step p{grid-column:1}
  .flow-step .code{margin-top:6px}
  .flow-step:not(:last-child){padding-bottom:16px}
  .flow-step:not(:last-child) .flow-node::after{display:none}
  .hw-note{grid-template-columns:1fr;gap:10px}
  .caps{grid-template-columns:1fr 1fr;gap:12px}
  .cap{padding:20px 18px}
  .arch{padding:20px}
  .why{grid-template-columns:1fr}
  .why .why-item:nth-child(n){padding:28px 0!important;border-left:0!important}
  .form{padding:24px 20px}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .cta{padding-block:80px}
}
@media (max-width:400px){
  .caps{grid-template-columns:1fr}
}
.site-header .container{max-width:1320px}

/* =========================================================
   Light theme (white background)
   System screens / camera mockups intentionally stay dark.
   ========================================================= */
/* Header */
.site-header{background:rgba(255,255,255,.86);border-bottom-color:var(--line)}
.site-header.is-scrolled{background:rgba(255,255,255,.97);border-bottom-color:var(--line);box-shadow:0 6px 20px -16px rgba(16,35,58,.35)}
.brand{color:var(--ink)}
.brand-name span{color:var(--accent-600)}
.site-header .brand-mark rect,.footer .brand-mark rect{fill:var(--navy-900)}
.by-company{border-left-color:var(--line);color:var(--muted)}
.nav a{color:var(--muted)}
.nav a:hover{color:var(--ink)}
.nav a.is-active{color:var(--ink);background:var(--bg-soft)}
.nav-toggle{border-color:var(--line-strong);color:var(--ink)}
@media (max-width:1180px){
  .nav.is-open{background:#fff;border-bottom-color:var(--line)}
  .nav.is-open a{border-bottom-color:var(--line)}
}

/* Hero */
.hero{background:linear-gradient(180deg,#FFFFFF 0%,var(--bg-soft) 100%);color:var(--text)}
.hero::before{
  background-image:linear-gradient(rgba(16,35,58,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(16,35,58,.045) 1px,transparent 1px);
}
.hero .eyebrow{color:var(--accent-600)}
.hero h1{color:var(--ink)}
.hero-tagline{color:var(--graphite)}
.hero-sub{color:var(--muted)}
.hero-meta{color:var(--muted)}
.hero .btn--ghost-dark{border-color:var(--line-strong);color:var(--ink);background:#fff}
.hero .btn--ghost-dark:hover{border-color:var(--ink);background:#fff}
.pw-caption{color:var(--muted)}
.product-window{box-shadow:0 40px 80px -48px rgba(10,24,41,.55)}

/* Pivot statement */
.pivot{background:var(--accent-soft);color:var(--ink);border-left:3px solid var(--accent)}
.pivot .ico{color:var(--accent-600)}
.pivot small{color:var(--muted)}

/* Solution cards: B becomes a light card, distinguished by a navy top rule and soft ground */
.sol-card--b{background:var(--bg-soft);border-color:var(--line);color:var(--text);border-top:3px solid var(--navy-700)}
.sol-card--b h3{color:var(--ink)}
.sol-card--b .sol-kicker{color:var(--navy-600)}
.sol-card--b .sol-badge{border-color:var(--line-strong);color:var(--graphite)}
.sol-card--b h3 small{color:var(--muted)}
.sol-card--b .sol-pos li{background:#E6EBF2;color:var(--navy-700)}
.sol-card--b .sol-list{border-color:var(--line)}
.sol-card--b .sol-list li{border-color:var(--line);color:var(--ink)}
.sol-card--b .sol-list li svg{color:var(--navy-600)}
.sol-card--b .sol-list li span{color:var(--muted)}
.sol-card--b .sol-value{color:var(--muted)}
.sol-card--b .sol-value strong{color:var(--ink)}
.sol-card--b .link-arrow{color:var(--accent-600)}
.platform-band{background:#fff}

/* Generic dark sections -> light */
.section--dark{background:#fff;color:var(--text);border-top:1px solid var(--line)}
.section--dark h2,.section--dark h3{color:var(--ink)}
.section--dark .section-head p{color:var(--muted)}
.section--dark .eyebrow{color:var(--accent-600)}

/* How it works */
.flow-node{background:#fff;border-color:var(--line-strong);color:var(--ink)}
.flow-node svg{color:var(--accent-600)}
.flow-step:not(:last-child) .flow-node::after{background:var(--accent)}
.flow-step:not(:last-child) .flow-node::before{border-left-color:var(--accent)}
.flow-step .code{color:var(--muted)}
.flow-step p{color:var(--muted)}
.hw-note{border-color:var(--line);background:var(--bg-soft);color:var(--muted)}
.hw-note svg{color:var(--accent-600)}
.hw-note strong{color:var(--ink)}

/* Architecture core boxes */
.arch-box--core{background:var(--accent-soft);border-color:#C9DAF8}
.arch-box--core h3{color:var(--ink)}
.arch-box--core h3 svg{color:var(--accent-600)}
.arch-box--core .arch-items li{background:#fff;color:var(--graphite)}
.arch-box--core .arch-items li em{color:var(--muted)}

/* Interface tabs + demo access */
.ui-tabs button[aria-selected="true"]{background:var(--accent);border-color:var(--accent);color:#fff}
.ui-tabs button[aria-selected="true"] small{color:#DCE8FD}
.demo-access{background:var(--bg-soft);border:1px solid var(--line);color:var(--text)}
.demo-access strong{color:var(--ink)}
.demo-access p{color:var(--muted)}

/* CTA + contact */
.cta{background:var(--bg-soft);color:var(--text);border-top:1px solid var(--line)}
.cta::before{
  background-image:linear-gradient(rgba(16,35,58,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(16,35,58,.045) 1px,transparent 1px);
}
.cta .eyebrow{color:var(--accent-600)}
.cta h2{color:var(--ink)}
.cta-sub{color:var(--muted)}
.cta-points li{color:var(--ink)}
.cta-points svg{color:var(--accent-600)}
.form{border:1px solid var(--line);box-shadow:0 24px 50px -36px rgba(16,35,58,.35)}

/* Footer */
.footer{background:#fff;color:var(--muted);border-top-color:var(--line)}
.footer h4{color:var(--ink)}
.footer a{color:var(--muted)}
.footer a:hover{color:var(--ink)}
.footer .brand{color:var(--ink)}
.footer-company{color:var(--ink)}
.footer-bottom{border-top-color:var(--line)}

/* Capabilities: 9 cards → 3 x 3 */
.caps{grid-template-columns:repeat(3,1fr)}
@media (max-width:600px){.caps{grid-template-columns:1fr 1fr}}
@media (max-width:400px){.caps{grid-template-columns:1fr}}

/* ---------- Restructure: fit conditions, zone examples, deployment ---------- */
.fit-list{margin:10px 0 0;padding:0;display:grid;gap:8px}
.fit-list li{list-style:none;position:relative;padding-left:22px;font-size:15px;color:var(--ink)}
.fit-list li::before{content:"";position:absolute;left:2px;top:.6em;width:8px;height:8px;border-radius:2px;background:var(--accent)}
.fit-eg{margin-top:12px;font-size:14px;color:var(--muted)}
.zone-examples{margin-top:40px;display:grid;grid-template-columns:1fr 1fr;gap:24px}
.zone-examples figure{margin:0}
.deploy{margin-top:20px;display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.deploy div{border:1px dashed var(--line-strong);border-radius:var(--radius);padding:16px 18px;font-size:14px;color:var(--muted);background:#fff}
.deploy b{display:block;color:var(--ink);font-weight:600;font-size:15px;margin-bottom:4px}
.caps-b{grid-template-columns:repeat(4,1fr)}
@media (max-width:1080px){.caps-b{grid-template-columns:1fr 1fr}}
@media (max-width:820px){.zone-examples,.deploy{grid-template-columns:1fr}}
@media (max-width:600px){.caps-b{grid-template-columns:1fr}}
.flow-step:last-child .flow-node{color:#fff}
/* Solution B card: same weight as A (status shown by badge, not by muted styling) */
.sol-card--b{background:#fff;border-color:var(--line);border-top:3px solid var(--accent)}
.section--dark.section--soft{background:var(--bg-soft)}
.section--soft .hw-note{background:#fff}
.sol-card--b .sol-kicker{color:var(--accent-600)}
.sol-card--b .sol-list li svg{color:var(--accent)}
/* Contact form: honeypot + Turnstile slot */
.hp{position:absolute!important;left:-9999px;width:1px;height:1px;overflow:hidden}
.turnstile:empty{display:none}
.form button[disabled]{opacity:.6;cursor:progress}