/* ==========================================================================
   XNUBBER — Precision Motion Control
   Design system + components
   ========================================================================== */

/* ---------- tokens ---------- */
:root{
  --ink:#070A0F;
  --ink-2:#0C1119;
  --panel:#111823;
  --panel-2:#16202D;
  --line:rgba(255,255,255,.08);
  --line-strong:rgba(255,255,255,.16);

  --paper:#F4F6F9;
  --paper-2:#EAEEF4;
  --card:#FFFFFF;
  --text:#0A111C;
  --muted:#5B6B80;
  --muted-2:#8695A8;

  --accent:#1E6BFF;
  --accent-soft:#E8F0FF;
  --accent-2:#FF6A2A;
  --accent-3:#00BFA6;

  --radius:16px;
  --radius-sm:10px;
  --radius-lg:26px;

  --shadow-sm:0 1px 2px rgba(9,16,28,.06),0 4px 16px rgba(9,16,28,.05);
  --shadow-md:0 18px 50px -18px rgba(9,16,28,.28);
  --shadow-lg:0 40px 90px -40px rgba(9,16,28,.45);

  --font:"Inter","SF Pro Display",-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:"SFMono-Regular",ui-monospace,"JetBrains Mono","Cascadia Mono",Consolas,"Liberation Mono",monospace;

  --nav-h:72px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;font-family:var(--font);color:var(--text);background:var(--paper);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  font-size:16px;line-height:1.65;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{margin:0;font-weight:680;letter-spacing:-.02em;line-height:1.15}
p{margin:0}
::selection{background:var(--accent);color:#fff}

.wrap{width:min(1200px,calc(100% - 48px));margin-inline:auto}
.wrap-wide{width:min(1360px,calc(100% - 48px));margin-inline:auto}
section[id]{scroll-margin-top:88px}

/* ---------- skip link ---------- */
.skip{position:absolute;left:-9999px;top:0;background:#fff;color:#000;padding:10px 16px;z-index:200}
.skip:focus{left:12px;top:12px}

/* ---------- header ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;height:var(--nav-h);z-index:100;
  display:flex;align-items:center;
  color:#fff;
  transition:background .35s var(--ease),box-shadow .35s var(--ease),height .35s var(--ease),border-color .35s var(--ease);
  border-bottom:1px solid transparent;
}
.site-header.is-solid{
  background:rgba(7,10,15,.82);
  backdrop-filter:saturate(160%) blur(16px);
  -webkit-backdrop-filter:saturate(160%) blur(16px);
  border-bottom-color:var(--line);
  height:64px;
}
.nav{display:flex;align-items:center;justify-content:space-between;gap:28px}
.brand{display:flex;align-items:center;gap:11px;font-weight:750;letter-spacing:.14em;font-size:15px}
.brand svg{width:30px;height:30px;flex:none}
.brand span{transform:translateY(1px)}
.brand em{font-style:normal;color:var(--accent)}

.nav-links{display:flex;gap:6px;align-items:center}
.nav-links a{
  padding:9px 14px;border-radius:999px;font-size:14px;font-weight:520;color:rgba(255,255,255,.76);
  transition:color .2s,background .2s;
}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav-links a.is-active{color:#fff}

.nav-cta{display:flex;align-items:center;gap:12px}
.nav-phone{font-family:var(--mono);font-size:13px;color:rgba(255,255,255,.7);letter-spacing:.02em}
.nav-phone:hover{color:#fff}

.burger{display:none;width:42px;height:42px;border:1px solid var(--line-strong);background:transparent;border-radius:12px;position:relative;cursor:pointer}
.burger i{position:absolute;left:11px;right:11px;height:1.5px;background:#fff;transition:.3s var(--ease)}
.burger i:nth-child(1){top:15px}
.burger i:nth-child(2){top:20.5px}
.burger i:nth-child(3){top:26px}
.burger[aria-expanded="true"] i:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.burger[aria-expanded="true"] i:nth-child(2){opacity:0}
.burger[aria-expanded="true"] i:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

.mobile-panel{
  position:fixed;inset:var(--nav-h) 0 auto 0;z-index:99;
  background:rgba(7,10,15,.97);backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
  padding:18px 24px 28px;
  display:none;
}
.mobile-panel.is-open{display:block}
.mobile-panel a{display:block;padding:14px 4px;color:rgba(255,255,255,.86);border-bottom:1px solid var(--line);font-size:16px}
.mobile-panel a:last-of-type{border-bottom:0}

/* ---------- language switch ---------- */
.lang-switch{
  display:inline-flex;align-items:center;height:32px;padding:0 13px;border-radius:999px;
  border:1px solid var(--line-strong);color:rgba(255,255,255,.72);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;transition:.2s var(--ease);
}
.lang-switch:hover{color:#fff;border-color:rgba(255,255,255,.4);background:rgba(255,255,255,.06)}
@media (max-width:680px){.nav-cta > .lang-switch{display:none}}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  height:48px;padding:0 22px;border-radius:999px;font-size:14.5px;font-weight:600;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
  transition:transform .18s var(--ease),background .22s,border-color .22s,color .22s,box-shadow .22s;
}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 12px 28px -12px rgba(30,107,255,.85)}
.btn-primary:hover{background:#3D82FF;transform:translateY(-1px)}
.btn-ghost{border-color:var(--line-strong);color:#fff;background:rgba(255,255,255,.02)}
.btn-ghost:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.32)}
.btn-dark{background:var(--text);color:#fff}
.btn-dark:hover{background:#1B2839;transform:translateY(-1px)}
.btn-line{border-color:rgba(10,17,28,.16);color:var(--text);background:#fff}
.btn-line:hover{border-color:rgba(10,17,28,.34);transform:translateY(-1px)}
.btn-sm{height:42px;padding:0 18px;font-size:13.5px}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(1100px 620px at 78% 8%,rgba(30,107,255,.30),transparent 62%),
    radial-gradient(720px 480px at 8% 92%,rgba(255,106,42,.12),transparent 60%),
    linear-gradient(180deg,#070A0F 0%,#080C13 58%,#0A1018 100%);
  padding:calc(var(--nav-h) + 74px) 0 78px;
}
.hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(760px 520px at 62% 32%,#000 20%,transparent 78%);
  -webkit-mask-image:radial-gradient(760px 520px at 62% 32%,#000 20%,transparent 78%);
  pointer-events:none;
}
.hero-grid{
  position:relative;display:grid;grid-template-columns:1.06fr .94fr;gap:40px;align-items:center;
}
.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11.5px;letter-spacing:.22em;text-transform:uppercase;
  color:rgba(255,255,255,.62);
}
.kicker::before{content:"";width:26px;height:1px;background:var(--accent)}
.kicker.on-light{color:var(--muted)}
.kicker.on-light::before{background:var(--accent)}

.hero h1{
  font-size:clamp(38px,5.1vw,66px);letter-spacing:-.035em;line-height:1.06;
  margin:22px 0 0;
}
.hero h1 .thin{font-weight:300;color:rgba(255,255,255,.72)}
.hero h1 .hl{
  background:linear-gradient(92deg,#6FA6FF,#1E6BFF 55%,#8FC2FF);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-lead{
  margin-top:24px;max-width:47ch;color:rgba(255,255,255,.68);font-size:16.5px;line-height:1.78;
}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}

.hero-figure{position:relative;display:flex;align-items:center;justify-content:center;min-height:440px}
.hero-figure .glow{
  position:absolute;width:min(560px,120%);aspect-ratio:1;border-radius:50%;
  background:radial-gradient(circle,rgba(30,107,255,.42),rgba(30,107,255,.10) 46%,transparent 68%);
  filter:blur(14px);
}
.hero-figure img{
  position:relative;width:min(430px,88%);height:auto;
  filter:drop-shadow(0 44px 70px rgba(0,0,0,.55));
  animation:float 9s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(-9px) rotate(-1.2deg)}50%{transform:translateY(9px) rotate(1.2deg)}}
@media (prefers-reduced-motion:reduce){.hero-figure img{animation:none}}

.hero-tag{
  position:absolute;right:2%;bottom:6%;
  display:flex;align-items:center;gap:10px;padding:10px 14px;border-radius:12px;
  background:rgba(12,17,25,.72);border:1px solid var(--line);backdrop-filter:blur(8px);
  font-family:var(--mono);font-size:11.5px;letter-spacing:.1em;color:rgba(255,255,255,.72);
}
.hero-tag b{color:#fff;font-weight:600}

/* kpi strip */
.kpi-strip{
  margin-top:66px;padding-top:26px;border-top:1px solid var(--line);
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
}
.kpi b{display:block;font-size:clamp(24px,2.6vw,34px);letter-spacing:-.03em;font-weight:700}
.kpi b .u{font-size:.5em;font-weight:600;color:rgba(255,255,255,.55);margin-left:4px;letter-spacing:0}
.kpi > span{display:block;margin-top:6px;font-size:12.5px;color:rgba(255,255,255,.5);letter-spacing:.04em}

/* ---------- sections ---------- */
.section{padding:104px 0}
.section.tight{padding:78px 0}
.section.paper{background:var(--paper)}
.section.paper-2{background:var(--paper-2)}
.section.dark{background:var(--ink);color:#fff}
.section.ink-2{background:var(--ink-2);color:#fff}

.sec-head{max-width:760px}
.sec-head h2{font-size:clamp(28px,3.5vw,44px);margin-top:18px;letter-spacing:-.03em}
.sec-head p{margin-top:18px;color:var(--muted);font-size:16.5px;line-height:1.78;max-width:62ch}
.section.dark .sec-head p,.section.ink-2 .sec-head p{color:rgba(255,255,255,.62)}
.sec-head.split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:end;max-width:none}
.sec-head.split p{margin-top:0}

/* ---------- tech cards ---------- */
.tech-grid{margin-top:54px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.tech-card{
  background:var(--card);border:1px solid rgba(10,17,28,.07);border-radius:var(--radius);
  padding:30px 28px 32px;box-shadow:var(--shadow-sm);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s;
}
.tech-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(30,107,255,.24)}
.tech-ico{
  width:44px;height:44px;border-radius:12px;display:grid;place-items:center;
  background:var(--accent-soft);color:var(--accent);margin-bottom:22px;
}
.tech-ico svg{width:22px;height:22px}
.tech-card h3{font-size:19px;letter-spacing:-.01em}
.tech-card .en{display:block;margin-top:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted-2)}
.tech-card p{margin-top:14px;color:var(--muted);font-size:14.5px;line-height:1.72}

/* ---------- product grid ---------- */
.prod-grid{margin-top:54px;display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.prod-card{
  position:relative;display:flex;flex-direction:column;
  background:var(--card);border:1px solid rgba(10,17,28,.07);border-radius:var(--radius);
  overflow:hidden;box-shadow:var(--shadow-sm);
  transition:transform .32s var(--ease),box-shadow .32s var(--ease),border-color .32s;
}
.prod-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:rgba(30,107,255,.28)}
.prod-visual{
  position:relative;height:250px;display:grid;place-items:center;
  background:
    radial-gradient(420px 220px at 50% 118%,rgba(30,107,255,.13),transparent 70%),
    linear-gradient(168deg,#F7F9FC,#EDF1F7);
  border-bottom:1px solid rgba(10,17,28,.06);
  overflow:hidden;
}
.prod-visual img{max-height:206px;max-width:80%;width:auto;filter:drop-shadow(0 18px 26px rgba(11,20,34,.22));transition:transform .45s var(--ease)}
.prod-card:hover .prod-visual img{transform:translateY(-4px) scale(1.035)}
.prod-visual .sheet{
  position:absolute;inset:0;
  background-image:linear-gradient(rgba(10,17,28,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(10,17,28,.05) 1px,transparent 1px);
  background-size:26px 26px;
  mask-image:radial-gradient(300px 170px at 50% 60%,#000,transparent 76%);
  -webkit-mask-image:radial-gradient(300px 170px at 50% 60%,#000,transparent 76%);
}
.prod-body{padding:24px 24px 26px;display:flex;flex-direction:column;gap:10px;flex:1}
.prod-family{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--accent)}
.prod-body h3{font-size:19.5px;letter-spacing:-.015em}
.prod-body p{color:var(--muted);font-size:14px;line-height:1.68;flex:1}
.prod-models{font-family:var(--mono);font-size:11.5px;color:var(--muted-2);letter-spacing:.02em;border-top:1px dashed rgba(10,17,28,.12);padding-top:12px}
.prod-link{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;font-weight:600;color:var(--accent);margin-top:2px}
.prod-link svg{width:14px;height:14px;transition:transform .25s var(--ease)}
.prod-card:hover .prod-link svg{transform:translateX(4px)}

/* svg-based cards */
.prod-visual.is-svg img{width:86%;max-height:none;height:auto;filter:drop-shadow(0 16px 22px rgba(11,20,34,.14))}

/* ---------- spec tabs ---------- */
.spec-shell{margin-top:52px;border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;background:rgba(255,255,255,.02)}
.tabs{display:flex;gap:4px;padding:10px;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:none}
.tabs::-webkit-scrollbar{display:none}
.tab{
  appearance:none;background:transparent;border:1px solid transparent;color:#AFBCCD;
  padding:11px 18px;border-radius:10px;font-size:14px;font-weight:500;white-space:nowrap;cursor:pointer;
  transition:.22s var(--ease);font-family:var(--font);
}
.tab:hover{color:#fff;background:rgba(255,255,255,.06)}
.tab[aria-selected="true"]{background:#fff;color:#0A111C;border-color:#fff}
.tab .t-en{font-family:var(--mono);font-size:10px;letter-spacing:.12em;opacity:.6;margin-left:7px}

.panel{display:none;padding:6px 0 0}
.panel.is-active{display:block}
.panel-note{
  display:flex;gap:12px;align-items:flex-start;
  padding:18px 26px;font-size:13px;color:rgba(255,255,255,.55);border-bottom:1px solid var(--line);
}
.panel-note b{color:#fff;font-weight:600}

.table-scroll{overflow-x:auto}
table.spec{width:100%;border-collapse:collapse;font-size:13px;min-width:720px}
table.spec th{
  text-align:left;padding:14px 18px;font-weight:600;font-size:12px;letter-spacing:.03em;
  color:rgba(255,255,255,.55);border-bottom:1px solid var(--line);white-space:nowrap;
  background:rgba(255,255,255,.02);
}
table.spec td{
  padding:13px 18px;border-bottom:1px solid rgba(255,255,255,.05);color:rgba(255,255,255,.82);
  font-family:var(--mono);font-size:12.5px;white-space:nowrap;
}
table.spec td:first-child{font-family:var(--mono);color:#fff;font-weight:600;letter-spacing:.02em}
table.spec tbody tr{transition:background .18s}
table.spec tbody tr:hover{background:rgba(30,107,255,.10)}
table.spec tbody tr:last-child td{border-bottom:0}
table.spec td.dim{color:rgba(255,255,255,.34)}

/* light variant for products page (covers .paper and .paper-2 bands) */
.section:is(.paper,.paper-2) .spec-shell{border-color:rgba(10,17,28,.1);background:#fff;box-shadow:var(--shadow-sm)}
.section:is(.paper,.paper-2) table.spec{font-size:13.5px}
.section:is(.paper,.paper-2) table.spec th{
  color:#55637A;background:rgba(10,17,28,.045);font-weight:600;letter-spacing:.03em;
  border-bottom:1px solid rgba(10,17,28,.14);
}
.section:is(.paper,.paper-2) table.spec td{
  color:#0A111C;font-size:13px;padding:14px 18px;
  border-bottom:1px solid rgba(10,17,28,.075);
  font-variant-numeric:tabular-nums;
}
.section:is(.paper,.paper-2) table.spec td:first-child{font-weight:650;color:#05090F}
.section:is(.paper,.paper-2) table.spec td.dim{color:var(--muted-2)}
.section:is(.paper,.paper-2) table.spec tbody tr:nth-child(even){background:rgba(10,17,28,.022)}
.section:is(.paper,.paper-2) table.spec tbody tr:hover{background:rgba(30,107,255,.07)}
.section:is(.paper,.paper-2) .tabs{border-bottom-color:rgba(10,17,28,.09);background:rgba(10,17,28,.015)}
.section:is(.paper,.paper-2) .tab{color:#55637A}
.section:is(.paper,.paper-2) .tab:hover{color:var(--text);background:rgba(10,17,28,.05)}
.section:is(.paper,.paper-2) .tab[aria-selected="true"]{background:var(--text);color:#fff;border-color:var(--text)}
.section:is(.paper,.paper-2) .panel-note{color:#55637A;border-bottom-color:rgba(10,17,28,.08);background:rgba(10,17,28,.02)}
.section:is(.paper,.paper-2) .panel-note b{color:var(--text)}

/* ---------- clamp feature ---------- */
.clamp-wrap{margin-top:56px;display:grid;grid-template-columns:.92fr 1.08fr;gap:56px;align-items:center}
.clamp-art{
  position:relative;border-radius:var(--radius-lg);overflow:hidden;
  background:
    radial-gradient(520px 360px at 30% 12%,rgba(30,107,255,.22),transparent 62%),
    linear-gradient(160deg,#121A26,#0A0F16);
  border:1px solid var(--line);
  padding:34px;display:grid;place-items:center;min-height:420px;
}
.clamp-art::after{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);
  background-size:34px 34px;
  mask-image:radial-gradient(70% 70% at 50% 50%,#000,transparent 84%);
  -webkit-mask-image:radial-gradient(70% 70% at 50% 50%,#000,transparent 84%);
  pointer-events:none;
}
.clamp-art svg,.clamp-art img{width:100%;height:auto;max-width:430px;position:relative;filter:drop-shadow(0 26px 40px rgba(0,0,0,.5))}
.clamp-art .cap{
  position:absolute;left:26px;bottom:22px;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:rgba(255,255,255,.45);text-transform:uppercase;
}
.clamp-copy h2{font-size:clamp(26px,3vw,38px);letter-spacing:-.03em}
.clamp-copy > p{margin-top:18px;color:rgba(255,255,255,.6);font-size:15.5px;line-height:1.78}
.clamp-variants{margin-top:30px;display:grid;gap:12px}
.variant{
  display:grid;grid-template-columns:auto 1fr auto;gap:16px;align-items:center;
  padding:16px 18px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.025);
  transition:.25s var(--ease);
}
.variant:hover{background:rgba(255,255,255,.055);border-color:rgba(30,107,255,.4);transform:translateX(3px)}
.variant .code{font-family:var(--mono);font-size:13px;font-weight:700;color:#fff;letter-spacing:.04em;min-width:64px}
.variant .desc{font-size:13.5px;color:rgba(255,255,255,.58);line-height:1.5}
.variant .desc b{color:rgba(255,255,255,.9);font-weight:560;display:block;font-size:14px;margin-bottom:2px}
.variant .force{font-family:var(--mono);font-size:12px;color:var(--accent);white-space:nowrap}
.clamp-specs{margin-top:26px;display:flex;gap:26px;flex-wrap:wrap;border-top:1px solid var(--line);padding-top:22px}
.clamp-specs div{font-size:12px;color:rgba(255,255,255,.42);letter-spacing:.04em}
.clamp-specs b{display:block;color:#fff;font-family:var(--mono);font-size:15px;margin-top:4px;letter-spacing:.01em}

/* ---------- applications ---------- */
.app-grid{margin-top:52px;display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.app-card{
  position:relative;padding:26px 22px;border-radius:14px;overflow:hidden;
  background:var(--card);border:1px solid rgba(10,17,28,.07);
  transition:.28s var(--ease);
}
.app-card:hover{transform:translateY(-3px);border-color:rgba(30,107,255,.3);box-shadow:var(--shadow-sm)}
.app-card svg{width:24px;height:24px;color:var(--accent);margin-bottom:16px}
.app-card h4{font-size:15.5px;letter-spacing:-.01em}
.app-card p{margin-top:7px;font-size:12.5px;color:var(--muted);line-height:1.6}

/* ---------- principle ---------- */
.steps{margin-top:56px;display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:s}
.step{position:relative;padding:0 26px 0 0}
.step::before{
  counter-increment:s;content:counter(s,decimal-leading-zero);
  display:block;font-family:var(--mono);font-size:11px;letter-spacing:.16em;color:var(--accent);
  padding-bottom:18px;border-bottom:1px solid var(--line);margin-bottom:22px;
}
.step:last-child{padding-right:0}
.step h4{font-size:16.5px}
.step p{margin-top:10px;font-size:13.5px;color:rgba(255,255,255,.55);line-height:1.7}
.step .bar{position:absolute;top:0;right:0;width:1px;height:100%;background:var(--line)}
.step:last-child .bar{display:none}

.principle-figure{
  margin-top:64px;display:grid;grid-template-columns:.85fr 1.15fr;gap:48px;align-items:center;
  border:1px solid var(--line);border-radius:var(--radius-lg);padding:38px;
  background:rgba(255,255,255,.02);
}
.principle-figure img{width:min(300px,88%);margin-inline:auto;filter:drop-shadow(0 30px 50px rgba(0,0,0,.55))}
.principle-copy h3{font-size:22px;letter-spacing:-.02em}
.principle-copy p{margin-top:14px;color:rgba(255,255,255,.6);font-size:14.5px;line-height:1.78}
.principle-copy ul{margin-top:20px;display:grid;gap:9px}
.principle-copy li{position:relative;padding-left:20px;font-size:13.5px;color:rgba(255,255,255,.62)}
.principle-copy li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:2px;background:var(--accent)}

/* ---------- about ---------- */
.about-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:64px;align-items:start}
.about-copy h2{font-size:clamp(28px,3.4vw,42px);letter-spacing:-.03em}
.about-copy p{margin-top:20px;color:var(--muted);font-size:16px;line-height:1.82}
.about-copy p.lead{color:var(--text);font-size:18px;line-height:1.75}
.about-stats{margin-top:38px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.stat{padding:22px;border-radius:14px;background:#fff;border:1px solid rgba(10,17,28,.07);box-shadow:var(--shadow-sm)}
.stat b{display:block;font-size:30px;letter-spacing:-.03em;line-height:1}
.stat b .u{font-size:.44em;color:var(--muted-2);margin-left:5px;letter-spacing:0}
.stat > span{display:block;margin-top:9px;font-size:12.5px;color:var(--muted);letter-spacing:.03em}

.about-media{position:relative;border-radius:var(--radius-lg);overflow:hidden;aspect-ratio:1150/1000;background:#0A0F16;border:1px solid rgba(10,17,28,.1)}
.about-media img{width:100%;height:100%;object-fit:contain;object-position:50% 100%;opacity:1}
.about-media .overlay{
  position:absolute;inset:auto 0 0 0;padding:24px 26px;
  background:linear-gradient(180deg,transparent,rgba(7,10,15,.92) 62%);
  color:#fff;
}
.about-media .overlay .k{font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;color:rgba(255,255,255,.55);text-transform:uppercase}
.about-media .overlay h4{margin-top:8px;font-size:17px}

/* ---------- contact ---------- */
.contact{
  position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(900px 480px at 82% 8%,rgba(30,107,255,.28),transparent 62%),
    linear-gradient(160deg,#080C12,#0B111A);
  padding:96px 0;
}
.contact-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:64px}
.contact h2{font-size:clamp(28px,3.6vw,44px);letter-spacing:-.03em;margin-top:18px}
.contact-lead{margin-top:18px;color:rgba(255,255,255,.6);font-size:16px;line-height:1.78;max-width:46ch}
.contact-list{margin-top:38px;display:grid;gap:2px}
.contact-row{display:grid;grid-template-columns:110px 1fr;gap:16px;padding:16px 0;border-top:1px solid var(--line);font-size:14.5px}
.contact-row dt{color:rgba(255,255,255,.42);font-family:var(--mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;padding-top:3px}
.contact-row dd{margin:0;color:rgba(255,255,255,.9)}
.contact-row dd a:hover{color:#fff;text-decoration:underline;text-underline-offset:3px}

.form-card{
  background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:var(--radius-lg);
  padding:34px;backdrop-filter:blur(10px);
}
.form-card h3{font-size:19px}
.form-card p.hint{margin-top:8px;font-size:13px;color:rgba(255,255,255,.45)}
.field{margin-top:16px}
.field label{display:block;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.45);margin-bottom:7px;font-family:var(--mono)}
.field input,.field textarea,.field select{
  width:100%;background:rgba(255,255,255,.04);border:1px solid var(--line-strong);border-radius:10px;
  padding:12px 14px;color:#fff;font-size:14px;font-family:inherit;outline:none;
  transition:border-color .2s,background .2s;
}
.field input::placeholder,.field textarea::placeholder{color:rgba(255,255,255,.3)}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--accent);background:rgba(255,255,255,.07)}
.field textarea{min-height:96px;resize:vertical}
.form-card .btn{width:100%;margin-top:20px}
.form-note{margin-top:14px;font-size:11.5px;color:rgba(255,255,255,.32);text-align:center}

/* ---------- footer ---------- */
.site-footer{background:#05070B;color:rgba(255,255,255,.5);padding:64px 0 34px;font-size:13.5px}
.footer-top{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;padding-bottom:44px;border-bottom:1px solid var(--line)}
.footer-brand{display:flex;align-items:center;gap:11px;color:#fff;font-weight:700;letter-spacing:.14em;font-size:15px;margin-bottom:16px}
.footer-brand svg{width:28px;height:28px}
.footer-about{max-width:34ch;line-height:1.72;color:rgba(255,255,255,.42)}
.footer-col h5{color:rgba(255,255,255,.85);font-size:12px;letter-spacing:.14em;text-transform:uppercase;margin:0 0 16px;font-family:var(--mono);font-weight:500}
.footer-col a{display:block;padding:6px 0;color:rgba(255,255,255,.46);transition:color .2s}
.footer-col a:hover{color:#fff}
.footer-bottom{display:flex;justify-content:space-between;gap:20px;padding-top:26px;font-size:12px;color:rgba(255,255,255,.32);flex-wrap:wrap}
.footer-bottom .en{font-family:var(--mono);letter-spacing:.08em}

/* ---------- page hero (sub pages) ---------- */
.page-hero{
  position:relative;overflow:hidden;color:#fff;padding:calc(var(--nav-h) + 78px) 0 64px;
  background:
    radial-gradient(900px 460px at 76% 0%,rgba(30,107,255,.26),transparent 64%),
    linear-gradient(180deg,#070A0F,#0A0F17);
}
.page-hero::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:60px 60px;
  mask-image:linear-gradient(180deg,#000,transparent 82%);
  -webkit-mask-image:linear-gradient(180deg,#000,transparent 82%);
}
.page-hero .wrap{position:relative}
.page-hero h1{font-size:clamp(32px,4.4vw,54px);letter-spacing:-.035em;margin-top:20px;max-width:16ch}
.page-hero p{margin-top:18px;max-width:60ch;color:rgba(255,255,255,.62);font-size:16px;line-height:1.78}
.crumbs{display:flex;gap:10px;align-items:center;font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:rgba(255,255,255,.4);text-transform:uppercase}
.crumbs a:hover{color:#fff}
.crumbs span{opacity:.4}

/* ---------- docs / downloads ---------- */
.doc-grid{margin-top:46px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.doc-card{
  display:flex;gap:16px;align-items:center;padding:20px 22px;border-radius:14px;
  background:var(--card);border:1px solid rgba(10,17,28,.08);box-shadow:var(--shadow-sm);
  transition:.25s var(--ease);
}
.doc-card:hover{transform:translateY(-3px);border-color:rgba(30,107,255,.3)}
.doc-ico{width:42px;height:42px;border-radius:10px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;flex:none}
.doc-ico svg{width:20px;height:20px}
.doc-card b{display:block;font-size:14.5px}
.doc-card span{display:block;margin-top:3px;font-size:12px;color:var(--muted)}
.doc-card .size{margin-left:auto;font-family:var(--mono);font-size:11.5px;color:var(--muted-2)}

/* ---------- chips ---------- */
.chip{
  display:inline-flex;align-items:center;height:32px;padding:0 14px;border-radius:999px;
  background:#fff;border:1px solid rgba(10,17,28,.1);font-size:12.5px;color:var(--muted);
  transition:.2s var(--ease);
}
.chip:hover{border-color:rgba(30,107,255,.35);color:var(--text);transform:translateY(-1px)}

/* ---------- reveal ---------- */
[data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
[data-reveal].is-in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){[data-reveal]{opacity:1;transform:none;transition:none}}

/* ---------- responsive ---------- */
@media (max-width:1080px){
  .hero-grid{grid-template-columns:1fr;gap:24px}
  .hero-figure{min-height:340px;order:-1}
  .hero-figure img{width:min(330px,72%)}
  .kpi-strip{grid-template-columns:repeat(2,1fr);gap:26px 20px}
  .tech-grid,.prod-grid{grid-template-columns:repeat(2,1fr)}
  .app-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr);gap:36px 0}
  .step:nth-child(2) .bar{display:none}
  .clamp-wrap,.principle-figure,.about-grid,.contact-grid,.sec-head.split{grid-template-columns:1fr;gap:38px}
  .doc-grid{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .nav-links,.nav-phone{display:none}
  .burger{display:block}
}
@media (max-width:680px){
  .wrap,.wrap-wide{width:calc(100% - 36px)}
  .section{padding:70px 0}
  .hero{padding:calc(var(--nav-h) + 46px) 0 56px}
  .hero h1{font-size:34px}
  .hero-lead{font-size:15px}
  .tech-grid,.prod-grid,.doc-grid{grid-template-columns:1fr}
  .app-grid{grid-template-columns:1fr 1fr}
  .steps{grid-template-columns:1fr;gap:30px}
  .step{padding-right:0}
  .step .bar{display:none}
  .about-stats{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  .variant{grid-template-columns:auto 1fr;row-gap:6px}
  .variant .force{grid-column:2;justify-self:start}
  .contact-row{grid-template-columns:1fr;gap:4px}
  .form-card{padding:24px}
  .panel-note{padding:16px 18px}
  table.spec th,table.spec td{padding:11px 14px}
}

/* ---- mobile table usability ---- */
@media (max-width:680px){
  .chip{height:30px;padding:0 12px;font-size:12px}
  table.spec{min-width:600px}
  table.spec th{padding:10px 12px;font-size:11px}
  table.spec td{padding:10px 12px;font-size:11.5px}
  html:lang(en) .spec-shell::before{content:"← swipe to see every column →"}
  .spec-shell::before{
    content:"← 左右滑动查看完整参数 →";display:block;padding:11px 16px 2px;
    font-family:var(--mono);font-size:10px;letter-spacing:.14em;color:#6B7A8D;
  }
  .section.dark .spec-shell::before,.section.ink-2 .spec-shell::before{color:rgba(255,255,255,.42)}
  .table-scroll{scrollbar-width:thin}
}

/* ==========================================================================
   AC buffer principle animation
   ========================================================================== */
.anim-block{
  margin-top:56px;display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center;
}
.anim-stage{
  position:relative;border:1px solid var(--line);border-radius:var(--radius-lg);
  background:
    radial-gradient(420px 320px at 30% 8%,rgba(30,107,255,.16),transparent 62%),
    linear-gradient(170deg,#0B121A,#080D14);
  padding:22px 18px 14px;overflow:hidden;
}
.anim-stage::before{
  content:"";position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);
  background-size:30px 30px;
  mask-image:radial-gradient(70% 70% at 50% 45%,#000,transparent 86%);
  -webkit-mask-image:radial-gradient(70% 70% at 50% 45%,#000,transparent 86%);
  pointer-events:none;
}
.anim-stage svg{position:relative;width:100%;height:auto;display:block}
.anim-ctrl{
  position:relative;display:flex;align-items:center;gap:10px;margin-top:12px;
  padding-top:12px;border-top:1px solid var(--line);
}
.anim-ctrl button{
  display:inline-flex;align-items:center;gap:7px;height:34px;padding:0 14px;border-radius:999px;
  background:rgba(255,255,255,.06);border:1px solid var(--line-strong);color:rgba(255,255,255,.82);
  font-size:12.5px;cursor:pointer;transition:.2s var(--ease);font-family:var(--font);
}
.anim-ctrl button:hover{background:rgba(255,255,255,.12);color:#fff}
.anim-ctrl svg{width:13px;height:13px;position:static}
.anim-ctrl .phase{
  margin-left:auto;font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(255,255,255,.42);
}
.anim-ctrl .phase b{color:#FF6A2A;font-weight:600}

.anim-side h3{font-size:22px;letter-spacing:-.02em}
.anim-side > p{margin-top:14px;color:rgba(255,255,255,.6);font-size:14.5px;line-height:1.78}

.meters{margin-top:26px;display:grid;gap:14px}
.meter{display:grid;grid-template-columns:88px 1fr 62px;gap:14px;align-items:center}
.meter dt{font-size:12px;color:rgba(255,255,255,.45);letter-spacing:.02em}
.meter .track{height:6px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden}
.meter .fill{height:100%;border-radius:999px;width:0;transition:none}
.meter .fill.v{background:linear-gradient(90deg,#1E6BFF,#6FA6FF)}
.meter .fill.f{background:linear-gradient(90deg,#FF6A2A,#FFB37A)}
.meter .fill.t{background:linear-gradient(90deg,#E0483C,#FF8A5B)}
.meter output{font-family:var(--mono);font-size:12px;color:rgba(255,255,255,.72);text-align:right}

.hole-dots{display:flex;gap:6px;margin-top:18px;align-items:center}
.hole-dots span{
  width:9px;height:9px;border-radius:50%;background:#FF6A2A;box-shadow:0 0 10px rgba(255,106,42,.6);
  transition:background .2s,box-shadow .2s,opacity .2s;
}
.hole-dots span.off{background:rgba(255,255,255,.16);box-shadow:none}
.hole-dots em{font-style:normal;font-size:11.5px;color:rgba(255,255,255,.4);margin-left:8px;font-family:var(--mono);letter-spacing:.08em}

.curve-box{margin-top:24px;border:1px solid var(--line);border-radius:14px;padding:14px 16px 8px;background:rgba(255,255,255,.02)}
.curve-box .cap{display:flex;justify-content:space-between;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:rgba(255,255,255,.38);text-transform:uppercase}
.curve-box svg{width:100%;height:auto;display:block;margin-top:6px}

@media (max-width:1080px){
  .anim-block{grid-template-columns:1fr;gap:34px}
}
@media (max-width:680px){
  .meter{grid-template-columns:74px 1fr 56px;gap:10px}
  .anim-stage{padding:14px 10px 10px}
}

/* reduced motion: freeze the loop, keep it readable */
@media (prefers-reduced-motion:reduce){
  .anim-stage [data-anim]{animation:none !important}
}

/* ---- hero caption on small screens: sit under the image, never on it ---- */
@media (max-width:680px){
  .hero-figure{flex-direction:column}
  .hero-figure .hero-tag{
    position:static;margin-top:14px;max-width:100%;width:fit-content;
    flex-wrap:wrap;justify-content:center;text-align:center;
    font-size:10.5px;padding:8px 14px;line-height:1.5;
  }
  .hero-figure .hero-tag span{display:none}
}

/* ==========================================================================
   RFQ cart — floating button, drawer, item rows
   ========================================================================== */
.cart-fab{
  position:fixed;right:24px;bottom:24px;z-index:130;
  display:inline-flex;align-items:center;gap:10px;height:52px;padding:0 20px;
  border-radius:999px;border:1px solid rgba(255,255,255,.14);
  background:linear-gradient(135deg,#1E6BFF,#0B4AD4);color:#fff;
  font-size:14px;font-weight:600;cursor:pointer;
  box-shadow:0 18px 40px -18px rgba(30,107,255,.9);
  transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.cart-fab:hover{transform:translateY(-2px);box-shadow:0 22px 46px -18px rgba(30,107,255,1)}
.cart-fab svg{width:19px;height:19px}
.cart-badge{
  min-width:22px;height:22px;padding:0 6px;border-radius:999px;
  background:#FF6A2A;color:#fff;font-family:var(--mono);font-size:11.5px;font-weight:700;
  display:inline-flex;align-items:center;justify-content:center;
}
.cart-badge[data-zero="1"]{display:none}

.cart-backdrop{
  position:fixed;inset:0;z-index:131;background:rgba(4,7,11,.62);
  backdrop-filter:blur(3px);opacity:0;transition:opacity .25s var(--ease);
}
.cart-backdrop.is-open{opacity:1}

.cart-panel{
  position:fixed;top:0;right:0;bottom:0;z-index:132;width:min(460px,100%);
  display:flex;flex-direction:column;
  background:#0B1119;border-left:1px solid rgba(255,255,255,.1);
  box-shadow:-30px 0 80px -40px rgba(0,0,0,.8);
  transform:translateX(102%);transition:transform .32s var(--ease);
  color:#fff;
}
.cart-panel.is-open{transform:none}
.cart-head{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 22px;border-bottom:1px solid rgba(255,255,255,.09);flex:none;
}
.cart-head h3{margin:0;font-size:17px;letter-spacing:-.01em}
.cart-head .cart-sub{display:block;margin-top:5px;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:rgba(255,255,255,.4);text-transform:uppercase}
.cart-close{
  width:34px;height:34px;border-radius:10px;border:1px solid rgba(255,255,255,.14);
  background:transparent;color:rgba(255,255,255,.7);font-size:20px;line-height:1;cursor:pointer;
}
.cart-close:hover{background:rgba(255,255,255,.08);color:#fff}
.cart-body{flex:1;overflow-y:auto;padding:18px 22px 8px}
.cart-empty{
  margin:26px 0;text-align:center;color:rgba(255,255,255,.4);font-size:13.5px;line-height:1.7;
}
.cart-list{list-style:none;margin:0 0 6px;padding:0;display:grid;gap:8px}
.cart-item{
  display:grid;grid-template-columns:1fr auto;gap:6px 12px;align-items:center;
  padding:12px 14px;border:1px solid rgba(255,255,255,.1);border-radius:12px;
  background:rgba(255,255,255,.03);
}
.cart-item .m{font-family:var(--mono);font-size:13px;font-weight:600;color:#fff;letter-spacing:.01em}
.cart-item .s{font-size:11.5px;color:rgba(255,255,255,.45);margin-top:3px}
.qty{display:inline-flex;align-items:center;gap:2px;border:1px solid rgba(255,255,255,.14);border-radius:9px;overflow:hidden}
.qty button{
  width:28px;height:28px;border:0;background:transparent;color:rgba(255,255,255,.8);
  font-size:15px;line-height:1;cursor:pointer;
}
.qty button:hover{background:rgba(255,255,255,.1);color:#fff}
.qty input{
  width:42px;height:28px;border:0;background:transparent;color:#fff;text-align:center;
  font-family:var(--mono);font-size:13px;outline:none;
}
.cart-item .rm{
  grid-column:1/-1;justify-self:end;margin-top:2px;border:0;background:none;
  color:rgba(255,255,255,.35);font-size:11.5px;cursor:pointer;
}
.cart-item .rm:hover{color:#FF6A2A}

.cart-form{margin-top:22px;padding-top:20px;border-top:1px solid rgba(255,255,255,.09)}
.cart-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.cart-form label{display:block;font-size:11.5px;color:rgba(255,255,255,.45);letter-spacing:.02em}
.cart-form label > span{display:block;margin-bottom:6px}
.cart-form input,.cart-form textarea{
  width:100%;margin-top:0;background:rgba(255,255,255,.04);
  border:1px solid rgba(255,255,255,.14);border-radius:9px;padding:10px 12px;
  color:#fff;font-size:13.5px;font-family:inherit;outline:none;
}
.cart-form input:focus,.cart-form textarea:focus{border-color:#1E6BFF;background:rgba(255,255,255,.07)}
.cart-form textarea{resize:vertical;min-height:60px}
.cart-form .full{grid-column:1/-1}
.cart-form .req{color:#FF6A2A;margin-left:2px}
.cart-form .is-invalid{border-color:#FF6A2A;background:rgba(255,106,42,.07)}

.cart-foot{flex:none;padding:16px 22px 22px;border-top:1px solid rgba(255,255,255,.09);display:grid;gap:10px}
.cart-foot .btn{width:100%;height:46px}
.cart-actions{display:grid;grid-template-columns:1fr auto;gap:10px}
.cart-actions .btn-line{background:transparent;color:rgba(255,255,255,.82);border-color:rgba(255,255,255,.2)}
.cart-actions .btn-line:hover{background:rgba(255,255,255,.07);color:#fff}
.cart-hint{margin:0;font-size:11.5px;line-height:1.6;color:rgba(255,255,255,.4);min-height:16px}
.cart-hint.warn{color:#FFB27A}

.cart-toast{
  position:fixed;left:50%;bottom:92px;transform:translate(-50%,12px);z-index:140;
  padding:11px 18px;border-radius:999px;background:#fff;color:#0A111C;
  font-size:13px;font-weight:600;opacity:0;pointer-events:none;
  transition:opacity .25s var(--ease),transform .25s var(--ease);
  box-shadow:0 16px 40px -18px rgba(0,0,0,.5);
}
.cart-toast.is-on{opacity:1;transform:translate(-50%,0)}

/* add-to-list button inside spec tables */
table.spec th.add-col{width:44px;text-align:right}
table.spec td.add-col{width:44px;padding-left:0;padding-right:12px;text-align:right}
.row-add{
  width:26px;height:26px;border-radius:8px;cursor:pointer;
  border:1px solid rgba(30,107,255,.45);background:rgba(30,107,255,.12);
  color:#1E6BFF;font-size:15px;line-height:1;font-weight:600;
  display:inline-flex;align-items:center;justify-content:center;
  transition:.18s var(--ease);
}
.row-add:hover{background:#1E6BFF;color:#fff;border-color:#1E6BFF}
.row-add.is-in{background:#FF6A2A;border-color:#FF6A2A;color:#fff}

@media (max-width:680px){
  .cart-fab{right:14px;bottom:14px;height:46px;padding:0 16px;font-size:13px}
  .cart-fab svg{width:17px;height:17px}
  .cart-grid{grid-template-columns:1fr}
  .cart-panel{width:100%}
  .cart-head{padding:16px 18px}
  .cart-body{padding:14px 18px 6px}
  .cart-foot{padding:14px 18px 18px}
}

/* ---- RFQ submitted state ---- */
.cart-done[hidden]{display:none}
.cart-done{flex:1;display:flex;align-items:center;justify-content:center;padding:30px 22px}
.cart-done-in{text-align:center;max-width:320px}
.cart-done-ico{
  width:56px;height:56px;margin:0 auto 18px;border-radius:50%;
  display:grid;place-items:center;background:rgba(34,181,115,.14);
  border:1px solid rgba(34,181,115,.45);color:#5BE0A8;font-size:26px;font-weight:700;
}
.cart-done h3{margin:0 0 10px;font-size:18px}
.cart-done p{margin:0 0 8px;font-size:14px;color:rgba(255,255,255,.75)}
.cart-done .mono{font-family:var(--mono);letter-spacing:.02em;color:#fff}
.cart-done-sub{color:rgba(255,255,255,.45)!important;font-size:13px!important;line-height:1.6;margin-bottom:20px!important}