/* ═══════════════════════════════════════════════════════════════
   张量之间 TENSOR BETWEEN · tensorbetween
   dark / kinetic / gradient-blue
   ═══════════════════════════════════════════════════════════════ */

:root{
  --bg:        #05060A;
  --bg-1:      #080A11;
  --bg-2:      #0B0E17;
  --ink:       #E9EFFA;
  --ink-2:     #B7C2D6;
  --muted:     #7E8AA0;
  --muted-2:   #566174;

  --cyan:      #22D3EE;
  --blue:      #3B82F6;
  --violet:    #8B5CF6;

  --line:      rgba(255,255,255,.085);
  --line-2:    rgba(255,255,255,.16);
  --glass:     rgba(255,255,255,.035);

  --grad: linear-gradient(100deg,#22D3EE 0%,#3B82F6 42%,#8B5CF6 100%);
  --grad-soft: linear-gradient(100deg,rgba(34,211,238,.18),rgba(59,130,246,.18),rgba(139,92,246,.18));

  --wrap: 1240px;
  --gut: 44px;

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
          "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:96px;
  background:var(--bg);
}

body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg,canvas{ display:block; max-width:100%; }
a{ color:inherit; text-decoration:none; }
ul,ol,dl,dd{ margin:0; padding:0; list-style:none; }
h1,h2,h3,p,figure{ margin:0; }
::selection{ background:rgba(59,130,246,.35); color:#fff; }

.wrap{ width:100%; max-width:var(--wrap); margin:0 auto; padding:0 var(--gut); }

.skip{
  position:fixed; left:-9999px; top:0; z-index:999;
  background:#fff; color:#000; padding:12px 20px;
}
.skip:focus{ left:12px; top:12px; }

/* ── 颗粒噪点 ─────────────────────────────────────────────── */
.grain{
  position:fixed; inset:0; z-index:9998; pointer-events:none;
  opacity:.05; mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ── 自定义光标 ───────────────────────────────────────────── */
.cursor{
  position:fixed; left:0; top:0; z-index:9999;
  width:34px; height:34px; margin:-17px 0 0 -17px;
  border:1px solid rgba(124,200,255,.55);
  border-radius:50%; pointer-events:none;
  transition:width .25s var(--ease), height .25s var(--ease),
             margin .25s var(--ease), background .25s ease, border-color .25s ease;
  mix-blend-mode:screen;
  opacity:0;
}
.cursor.on{ opacity:1; }
.cursor.hot{
  width:64px; height:64px; margin:-32px 0 0 -32px;
  background:rgba(59,130,246,.14);
  border-color:rgba(124,200,255,.9);
}
.cursor-dot{
  position:absolute; left:50%; top:50%;
  width:4px; height:4px; margin:-2px 0 0 -2px;
  border-radius:50%; background:#8FD8FF;
}
@media (hover:none),(pointer:coarse){ .cursor{ display:none; } }

/* ── 排版 ─────────────────────────────────────────────────── */
h1,h2{
  font-family:var(--sans);
  font-weight:800;
  line-height:1.06;
  letter-spacing:-.022em;
  color:#fff;
}
h2{ font-size:clamp(30px,4vw,52px); line-height:1.14; letter-spacing:-.02em; }
h3{ font-size:19px; font-weight:600; letter-spacing:-.005em; }
em{ font-style:normal; background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent; }

.sec-label{
  display:flex; align-items:center; gap:12px;
  font-family:var(--mono); font-size:11px; letter-spacing:.18em;
  text-transform:uppercase; color:var(--muted-2);
  margin-bottom:26px;
}
.sec-label i{
  font-style:normal; display:inline-flex; align-items:center; justify-content:center;
  width:26px; height:20px; border:1px solid var(--line-2); border-radius:3px;
  color:var(--muted); font-size:10px; letter-spacing:0;
}
.sec-label.light{ color:rgba(255,255,255,.42); }

.fine{ font-size:12.5px; color:var(--muted-2); line-height:1.8; margin-top:24px; }

/* ── 按钮 ─────────────────────────────────────────────────── */
.btn{
  position:relative; display:inline-flex; align-items:center; gap:10px;
  padding:16px 28px; border-radius:6px;
  font-size:14.5px; font-weight:600; letter-spacing:.01em;
  will-change:transform;
  transition:transform .35s var(--ease), box-shadow .35s var(--ease),
             background .35s var(--ease), border-color .35s var(--ease), color .35s ease;
}
.btn svg{ width:15px; height:15px; transition:transform .35s var(--ease); }

.btn-primary{
  color:#03121F;
  background:linear-gradient(100deg,#7DE7F5,#5EA8FF 50%,#A78BFA);
  box-shadow:0 0 0 1px rgba(255,255,255,.12) inset,
             0 18px 48px -22px rgba(59,130,246,.9);
  overflow:hidden;
}
.btn-primary::after{
  content:""; position:absolute; inset:0;
  background:linear-gradient(100deg,transparent 20%,rgba(255,255,255,.55) 50%,transparent 80%);
  transform:translateX(-130%);
  transition:transform .8s var(--ease);
}
.btn-primary:hover::after{ transform:translateX(130%); }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 0 0 1px rgba(255,255,255,.2) inset, 0 26px 60px -24px rgba(59,130,246,1); }
.btn-primary:hover svg{ transform:translate(2px,-2px); }

.btn-ghost{
  color:var(--ink); border:1px solid var(--line-2);
  background:rgba(255,255,255,.03);
  backdrop-filter:blur(8px);
}
.btn-ghost:hover{
  border-color:rgba(124,200,255,.6); color:#fff;
  background:rgba(59,130,246,.1);
  transform:translateY(-2px);
}
.btn-ghost:hover svg{ transform:translateY(2px); }

/* ── 导航 ─────────────────────────────────────────────────── */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:100;
  transition:background .45s ease, border-color .45s ease, backdrop-filter .45s ease;
  border-bottom:1px solid transparent;
}
.nav.solid{
  background:rgba(5,6,10,.72);
  backdrop-filter:saturate(180%) blur(18px);
  -webkit-backdrop-filter:saturate(180%) blur(18px);
  border-bottom-color:var(--line);
}
.nav-inner{
  max-width:var(--wrap); margin:0 auto; padding:18px var(--gut);
  display:flex; align-items:center; justify-content:space-between; gap:24px;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{ width:34px; height:34px; flex:none; filter:drop-shadow(0 0 12px rgba(59,130,246,.5)); }
.brand-txt{ display:flex; flex-direction:column; line-height:1.05; }
.brand-txt b{ font-size:16px; font-weight:700; letter-spacing:.1em; color:#fff; }
.brand-txt i{
  font-family:var(--mono); font-style:normal; font-size:8.5px;
  letter-spacing:.24em; color:var(--muted-2); margin-top:5px;
}

.nav-links{ display:flex; align-items:center; gap:32px; }
.nav-links > a{
  position:relative; font-size:14px; color:var(--ink-2); padding:6px 0;
  transition:color .3s ease;
}
.nav-links > a:not(.nav-cta)::after{
  content:""; position:absolute; left:0; bottom:-2px; height:1px; width:0;
  background:var(--grad); transition:width .4s var(--ease);
}
.nav-links > a:not(.nav-cta):hover{ color:#fff; }
.nav-links > a:not(.nav-cta):hover::after{ width:100%; }

.nav-cta{
  position:relative; padding:11px 20px; border-radius:5px;
  border:1px solid var(--line-2); color:#fff; font-weight:500;
  background:rgba(255,255,255,.03);
  overflow:hidden;
  transition:border-color .35s ease, background .35s ease;
}
.nav-cta::before{
  content:""; position:absolute; inset:0;
  background:var(--grad); opacity:0; transition:opacity .35s ease;
}
.nav-cta span{ position:relative; z-index:1; }
.nav-cta:hover{ border-color:transparent; color:#03121F; }
.nav-cta:hover::before{ opacity:1; }

.nav-progress{ height:1px; background:transparent; }
.nav-progress i{
  display:block; height:1px; width:0;
  background:var(--grad);
  box-shadow:0 0 12px rgba(59,130,246,.9);
}

.nav-toggle{
  display:none; width:42px; height:42px; padding:0; cursor:pointer;
  background:none; border:1px solid var(--line-2); border-radius:5px; position:relative;
}
.nav-toggle span{
  position:absolute; left:12px; width:18px; height:1px; background:var(--ink);
  transition:transform .3s var(--ease);
}
.nav-toggle span:nth-child(1){ top:17px; }
.nav-toggle span:nth-child(2){ top:24px; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform:translateY(3.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ transform:translateY(-3.5px) rotate(-45deg); }

/* ── HERO ─────────────────────────────────────────────────── */
.hero{
  position:relative; min-height:min(100svh,1020px);
  display:flex; align-items:center;
  padding:140px 0 96px;
  overflow:hidden;
  background:
    radial-gradient(900px 600px at 50% -10%, rgba(59,130,246,.16), transparent 65%),
    radial-gradient(700px 500px at 85% 20%, rgba(139,92,246,.10), transparent 70%),
    var(--bg);
}
.hero-canvas{
  position:absolute; inset:0; width:100%; height:100%;
  opacity:.85;
}
.hero::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(180deg, rgba(5,6,10,0) 45%, rgba(5,6,10,.75) 88%, var(--bg) 100%);
}
.hero-inner{ position:relative; z-index:2; }

.hero-aurora{ position:absolute; inset:0; overflow:hidden; pointer-events:none; }
.hero-aurora i{
  position:absolute; display:block; border-radius:50%;
  filter:blur(90px); opacity:.5;
}
.hero-aurora i:nth-child(1){
  width:44vw; height:44vw; left:-8vw; top:-12vw;
  background:radial-gradient(circle,rgba(34,211,238,.55),transparent 65%);
  animation:drift1 22s ease-in-out infinite alternate;
}
.hero-aurora i:nth-child(2){
  width:38vw; height:38vw; right:-6vw; top:6vw;
  background:radial-gradient(circle,rgba(139,92,246,.5),transparent 65%);
  animation:drift2 26s ease-in-out infinite alternate;
}
.hero-aurora i:nth-child(3){
  width:40vw; height:30vw; left:32vw; bottom:-14vw;
  background:radial-gradient(circle,rgba(59,130,246,.42),transparent 68%);
  animation:drift1 30s ease-in-out infinite alternate-reverse;
}
@keyframes drift1{ to{ transform:translate3d(6vw,4vw,0) scale(1.15); } }
@keyframes drift2{ to{ transform:translate3d(-5vw,5vw,0) scale(1.1); } }

.hero-eyebrow{
  display:flex; align-items:center; flex-wrap:wrap; gap:10px;
  font-family:var(--mono); font-size:11px; letter-spacing:.16em;
  color:var(--ink-2); margin-bottom:32px;
}
.hero-eyebrow .pulse{
  width:6px; height:6px; border-radius:50%; background:var(--cyan);
  box-shadow:0 0 0 0 rgba(34,211,238,.7);
  animation:pulse 2.4s ease-out infinite;
}
@keyframes pulse{
  0%{ box-shadow:0 0 0 0 rgba(34,211,238,.6); }
  70%{ box-shadow:0 0 0 12px rgba(34,211,238,0); }
  100%{ box-shadow:0 0 0 0 rgba(34,211,238,0); }
}
.hero-eyebrow .sep{ color:var(--muted-2); }

.hero-title{
  font-size:clamp(46px,8.2vw,104px);
  line-height:.98; letter-spacing:-.035em;
  margin:0 0 34px;
}
.hero-title .line{ display:block; }
.hero-title .comma{ color:var(--blue); }
.hero-title .split{ display:inline-block; }
.hero-title .grad-line{
  display:inline-block;
  background:var(--grad);
  background-size:200% 100%;
  -webkit-background-clip:text; background-clip:text; color:transparent;
  animation:shift 9s ease-in-out infinite;
}
.js .hero-title .grad-line{
  opacity:0; transform:translateY(.4em); filter:blur(10px);
  animation:lineIn 1s var(--ease) .3s forwards, shift 9s ease-in-out 1.4s infinite;
}
@keyframes lineIn{
  0%{ opacity:0; transform:translateY(.4em); filter:blur(10px); }
  100%{ opacity:1; transform:none; filter:blur(0); }
}
@keyframes shift{ 0%,100%{ background-position:0% 50%; } 50%{ background-position:100% 50%; } }

.js .hero-title .split > span{
  display:inline-block;
  opacity:0; transform:translateY(.5em) rotate(3deg);
  filter:blur(8px);
  animation:charIn .9s var(--ease) forwards;
}
@keyframes charIn{ to{ opacity:1; transform:none; filter:blur(0); } }

.hero-sub{
  max-width:34em; color:var(--ink-2);
  font-size:clamp(15px,1.2vw,17px); line-height:1.95;
  margin-bottom:42px;
}
.hero-sub b{ color:#fff; font-weight:600; }

.hero-actions{ display:flex; flex-wrap:wrap; gap:14px; }

.hero-stats{
  display:flex; flex-wrap:wrap; gap:0;
  margin-top:clamp(56px,9vh,96px);
  border-top:1px solid var(--line); padding-top:26px;
}
.hero-stats li{
  padding-right:clamp(24px,4vw,56px); margin-right:clamp(24px,4vw,56px);
  border-right:1px solid var(--line);
  display:flex; flex-direction:column; gap:2px;
}
.hero-stats li:last-child{ border-right:0; padding-right:0; margin-right:0; }
.hero-stats b{
  font-size:26px; font-weight:700; letter-spacing:-.02em;
  background:var(--grad); -webkit-background-clip:text; background-clip:text; color:transparent;
  font-variant-numeric:tabular-nums;
}
.hero-stats span{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.14em;
  color:var(--muted-2); text-transform:uppercase;
}

.hero-scroll{
  position:absolute; left:50%; bottom:28px; transform:translateX(-50%);
  display:flex; flex-direction:column; align-items:center; gap:10px;
  font-family:var(--mono); font-size:9px; letter-spacing:.3em; color:var(--muted-2);
  z-index:2;
}
.hero-scroll i{
  display:block; width:1px; height:44px;
  background:linear-gradient(180deg,var(--cyan),transparent);
  animation:scrollLine 2.2s ease-in-out infinite;
}
@keyframes scrollLine{
  0%{ transform:scaleY(.2); transform-origin:top; opacity:0; }
  40%{ opacity:1; }
  100%{ transform:scaleY(1); transform-origin:top; opacity:0; }
}

/* ── MARQUEE ──────────────────────────────────────────────── */
.marquee{
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
  background:linear-gradient(90deg,rgba(5,6,10,1),rgba(11,14,23,1),rgba(5,6,10,1));
  overflow:hidden; padding:20px 0;
  -webkit-mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
          mask-image:linear-gradient(90deg,transparent,#000 12%,#000 88%,transparent);
}
.marquee-track{
  display:flex; align-items:center; gap:28px; width:max-content;
  animation:scrollX 42s linear infinite;
}
.marquee-track span{
  font-family:var(--mono); font-size:11.5px; letter-spacing:.28em;
  color:var(--muted); white-space:nowrap;
}
.marquee-track b{ color:var(--blue); font-size:8px; }
@keyframes scrollX{ to{ transform:translateX(-50%); } }

/* ── 主张 ─────────────────────────────────────────────────── */
.mani{ padding:clamp(90px,13vh,150px) 0; position:relative; }
.mani::before{
  content:""; position:absolute; inset:0;
  background:radial-gradient(700px 400px at 15% 0%, rgba(59,130,246,.09), transparent 70%);
  pointer-events:none;
}
.mani-title{
  font-size:clamp(34px,5.4vw,72px);
  line-height:1.08; letter-spacing:-.03em; margin-bottom:52px;
}
.mani-cols{
  display:grid; grid-template-columns:1fr 1fr; gap:clamp(24px,5vw,72px);
  max-width:1000px;
}
.mani-cols p{ color:var(--ink-2); font-size:15.5px; line-height:2; }
.mani-cols p + p{
  padding-left:clamp(24px,5vw,72px);
  border-left:1px solid var(--line);
}

/* ── 区块骨架 ─────────────────────────────────────────────── */
.sec{ position:relative; padding:clamp(84px,12vh,132px) 0; }
.sec-dark{
  background:linear-gradient(180deg,var(--bg-1),var(--bg-2));
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
}
.sec-head{ max-width:820px; margin-bottom:clamp(48px,7vh,80px); }
.sec-sub{ color:var(--ink-2); font-size:15.5px; line-height:1.95; max-width:36em; margin-top:22px; }

/* ── 能力卡片 ─────────────────────────────────────────────── */
.cards{
  display:grid; grid-template-columns:repeat(3,1fr); gap:16px;
}
.card{
  position:relative; overflow:hidden;
  padding:32px 28px 28px;
  border-radius:14px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.012));
  display:flex; flex-direction:column;
  transition:transform .5s var(--ease), border-color .5s var(--ease), box-shadow .5s var(--ease);
}
.card-glow{
  position:absolute; inset:-1px; border-radius:14px; pointer-events:none;
  opacity:0; transition:opacity .5s ease;
  background:radial-gradient(320px circle at var(--mx,50%) var(--my,50%),
             rgba(59,130,246,.22), transparent 62%);
}
.card:hover{ transform:translateY(-6px); border-color:rgba(124,200,255,.35); box-shadow:0 30px 70px -40px rgba(59,130,246,.9); }
.card:hover .card-glow{ opacity:1; }
.card > *{ position:relative; z-index:1; }

.card-no{
  font-family:var(--mono); font-size:10.5px; letter-spacing:.16em;
  color:var(--blue); margin-bottom:22px;
}
.card h3{ margin-bottom:8px; color:#fff; }
.card-en{
  font-family:var(--mono); font-size:9.5px; letter-spacing:.18em;
  color:var(--muted-2); margin-bottom:16px;
}
.card-txt{ color:var(--ink-2); font-size:14px; line-height:1.85; flex:1; }

.chips{ display:flex; flex-wrap:wrap; gap:7px; margin-top:24px; }
.chips li{
  font-family:var(--mono); font-size:10px; letter-spacing:.06em;
  color:var(--ink-2); padding:4px 9px; border-radius:4px;
  border:1px solid var(--line); background:rgba(255,255,255,.025);
  transition:border-color .3s ease, color .3s ease;
}
.card:hover .chips li{ border-color:rgba(124,200,255,.28); color:#CFE3FF; }

/* ── 交付路径 ─────────────────────────────────────────────── */
.paths{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.path{
  position:relative; overflow:hidden;
  padding:36px 34px 30px; border-radius:14px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.012));
  display:flex; flex-direction:column;
  transition:transform .5s var(--ease), border-color .5s var(--ease), box-shadow .5s var(--ease);
}
.path:hover{ transform:translateY(-5px); border-color:rgba(124,200,255,.35); box-shadow:0 30px 70px -40px rgba(59,130,246,.9); }
.path-head{ padding-bottom:22px; border-bottom:1px solid var(--line); margin-bottom:22px; }
.path-code{
  font-family:var(--mono); font-size:10px; letter-spacing:.18em; color:var(--muted-2);
}
.path h3{ font-size:23px; margin:12px 0 10px; color:#fff; font-weight:700; }
.path-tag{
  display:inline-block; font-family:var(--mono); font-size:10px; letter-spacing:.1em;
  color:#8FE3FF; padding:5px 10px; border-radius:4px;
  background:rgba(34,211,238,.1); border:1px solid rgba(34,211,238,.28);
}
.path-lead{ color:var(--ink-2); font-size:14.5px; line-height:1.9; margin-bottom:24px; }
.path dl > div{
  display:grid; grid-template-columns:86px 1fr; gap:16px;
  padding:13px 0; border-top:1px solid var(--line);
}
.path dt{ font-family:var(--mono); font-size:10px; letter-spacing:.1em; color:var(--muted-2); padding-top:4px; }
.path dd{ font-size:14px; color:var(--ink-2); line-height:1.7; }
.path-link{
  margin-top:auto; padding-top:24px;
  display:inline-flex; align-items:center; gap:8px;
  font-size:13.5px; color:#9EC9FF; width:fit-content;
}
.path-link i{ font-style:normal; transition:transform .35s var(--ease); }
.path-link:hover i{ transform:translate(3px,-3px); }

.combo{
  margin-top:16px; padding:28px 32px; border-radius:14px;
  border:1px dashed rgba(255,255,255,.16);
  background:rgba(255,255,255,.015);
}
.combo-t{ font-family:var(--mono); font-size:10.5px; letter-spacing:.16em; color:var(--muted-2); margin-bottom:16px; }
.combo-i{ display:flex; flex-wrap:wrap; gap:10px; }
.combo-i span{
  font-size:13px; color:var(--ink-2); padding:7px 14px; border-radius:5px;
  border:1px solid var(--line-2); background:rgba(255,255,255,.02);
  transition:border-color .3s ease, color .3s ease;
}
.combo-i span:hover{ border-color:rgba(124,200,255,.45); color:#fff; }

/* ── 流程 ─────────────────────────────────────────────────── */
.steps{ position:relative; border-top:1px solid var(--line); }
.steps::before{
  content:""; position:absolute; left:31px; top:0; bottom:0; width:1px;
  background:linear-gradient(180deg,rgba(34,211,238,.5),rgba(59,130,246,.22),transparent);
}
.step{
  position:relative;
  display:grid; grid-template-columns:64px 1fr; gap:28px;
  padding:34px 0; border-bottom:1px solid var(--line);
  transition:background .4s ease;
}
.step-no{
  position:relative; z-index:1;
  display:inline-flex; align-items:center; justify-content:center;
  width:64px; height:34px; border-radius:5px;
  font-family:var(--mono); font-size:11.5px; letter-spacing:.1em;
  color:var(--blue); border:1px solid rgba(59,130,246,.35);
  background:rgba(59,130,246,.08);
  transition:color .4s ease, border-color .4s ease, background .4s ease, box-shadow .4s ease;
}
.step:hover .step-no{
  color:#02121E; background:linear-gradient(100deg,#7DE7F5,#5EA8FF);
  border-color:transparent; box-shadow:0 0 30px -6px rgba(59,130,246,.8);
}
.step-body h3{ font-size:20px; color:#fff; margin-bottom:8px; }
.step-en{
  font-family:var(--mono); font-size:9.5px; letter-spacing:.18em;
  color:var(--muted-2); margin-left:12px; vertical-align:middle;
}
.step-body p{ color:var(--ink-2); font-size:14.5px; line-height:1.9; max-width:60ch; }

/* ── 架构 ─────────────────────────────────────────────────── */
.stack{
  display:grid; grid-template-columns:1.08fr .92fr;
  gap:clamp(36px,6vw,80px); align-items:center;
}
.stack-art svg{ width:100%; height:auto; }
.flow-lines path{ animation:dash 3.2s linear infinite; }
@keyframes dash{ to{ stroke-dashoffset:-56; } }

.stack-notes{ display:grid; }
.note{
  display:grid; grid-template-columns:36px 1fr; gap:16px;
  padding:22px 0; border-bottom:1px solid var(--line);
}
.note:first-child{ border-top:1px solid var(--line); }
.note-i{ font-family:var(--mono); font-size:10.5px; letter-spacing:.1em; color:var(--blue); padding-top:5px; }
.note h3{ font-size:15.5px; color:#fff; margin-bottom:5px; }
.note p{ color:var(--ink-2); font-size:14px; line-height:1.85; }

/* ── 智能体实现架构 ───────────────────────────────────────── */
.runtime{
  display:grid; grid-template-columns:1fr 1.02fr;
  gap:clamp(28px,5vw,64px); align-items:start;
}
.rt-steps li{
  display:grid; grid-template-columns:36px 1fr; gap:18px;
  padding:15px 0; border-bottom:1px solid var(--line);
}
.rt-steps li:first-child{ border-top:1px solid var(--line); }
.rt-no{
  display:inline-flex; align-items:center; justify-content:center;
  width:36px; height:23px; border-radius:4px;
  font-family:var(--mono); font-size:10px; letter-spacing:.06em;
  color:var(--blue); border:1px solid rgba(59,130,246,.32);
  background:rgba(59,130,246,.08);
  transition:color .35s ease, background .35s ease, border-color .35s ease;
}
.rt-steps li:hover .rt-no{
  color:#03121F; border-color:transparent;
  background:linear-gradient(100deg,#7DE7F5,#5EA8FF);
}
.rt-steps h3{ font-size:16.5px; color:#fff; margin-bottom:4px; }
.rt-en{
  font-family:var(--mono); font-size:8.5px; letter-spacing:.16em;
  color:var(--muted-2); margin-left:10px; vertical-align:middle;
}
.rt-steps p{ font-size:13.6px; color:var(--ink-2); line-height:1.8; }

.trace{
  position:sticky; top:104px;
  border:1px solid var(--line-2); border-radius:12px; overflow:hidden;
  background:linear-gradient(180deg,#080B13,#05070C);
  box-shadow:0 40px 100px -60px rgba(59,130,246,.95);
}
.trace-bar{
  display:flex; align-items:center; gap:6px;
  padding:11px 14px; border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.028);
}
.trace-bar i{ width:8px; height:8px; border-radius:50%; background:#26303F; }
.trace-bar i:nth-child(1){ background:#E0533D; }
.trace-bar i:nth-child(2){ background:#D9A22B; }
.trace-bar i:nth-child(3){ background:#3FA96A; }
.trace-bar span{
  margin-left:auto; font-family:var(--mono); font-size:9.5px;
  letter-spacing:.16em; color:var(--muted-2);
}
.trace-body{
  margin:0; padding:20px 18px 22px;
  font-family:var(--mono); font-size:11.5px; line-height:2.1;
  color:#9FB0C6; white-space:pre; overflow-x:auto;
  -webkit-font-smoothing:antialiased;
}
.trace-body .ln{ display:block; }
.c-dim{ color:#45566B; font-weight:400; }
.c-user{ color:#fff; font-weight:500; }
.c-tag{ color:#5EA8FF; display:inline-block; width:54px; font-weight:400; }
.c-ok{ color:#4ADE80; }
.c-warn{ color:#FBBF24; }
.caret{
  display:inline-block; width:7px; height:13px; vertical-align:-2px;
  background:#7DE7F5; animation:blink 1.1s steps(1) infinite;
}
@keyframes blink{ 50%{ opacity:0; } }

.rt-foot{
  display:flex; align-items:center; gap:18px; flex-wrap:wrap;
  margin-top:30px; padding-top:22px; border-top:1px solid var(--line);
}
.chip-k{ font-family:var(--mono); font-size:10px; letter-spacing:.16em; color:var(--muted-2); }
.rt-foot .chips{ margin-top:0; }

/* ── 案例 ─────────────────────────────────────────────────── */
.cases{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
.case{
  position:relative; overflow:hidden;
  padding:34px 32px 30px; border-radius:14px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.045), rgba(255,255,255,.012));
  display:flex; flex-direction:column;
  transition:transform .5s var(--ease), border-color .5s var(--ease), box-shadow .5s var(--ease);
}
.case:hover{ transform:translateY(-5px); border-color:rgba(124,200,255,.35); box-shadow:0 30px 70px -40px rgba(59,130,246,.9); }
.case-loc{
  font-family:var(--mono); font-size:10px; letter-spacing:.14em;
  color:#8FE3FF; margin-bottom:16px;
}
.case-loc span{ color:var(--muted-2); margin:0 6px; }
.case h3{ font-size:22px; line-height:1.45; color:#fff; margin-bottom:24px; font-weight:700; }
.case dl > div{ padding:14px 0; border-top:1px solid var(--line); }
.case dt{
  font-family:var(--mono); font-size:10px; letter-spacing:.12em;
  color:var(--muted-2); margin-bottom:6px;
}
.case dd{ font-size:14px; color:var(--ink-2); line-height:1.85; }
.case .chips{ margin-top:auto; padding-top:22px; }

/* ── 关于 ─────────────────────────────────────────────────── */
.about{ display:grid; grid-template-columns:1.06fr .94fr; gap:clamp(32px,6vw,80px); }
.about-intro p{ color:var(--ink-2); font-size:15.5px; line-height:2; }
.about-lead{
  font-size:clamp(18px,1.6vw,21px) !important; line-height:1.9 !important;
  color:#fff !important; margin-bottom:24px;
  padding-left:20px; border-left:2px solid transparent;
  border-image:var(--grad) 1;
}
.about-lead b{ color:#8FE3FF; }
.principles li{
  display:grid; grid-template-columns:34px 1fr; gap:14px;
  padding:20px 0; border-bottom:1px solid var(--line);
}
.principles li:first-child{ border-top:1px solid var(--line); }
.principles span{ font-family:var(--mono); color:var(--blue); padding-top:2px; }
.principles p{ color:var(--ink-2); font-size:14.5px; line-height:1.9; }

/* ── 联系 ─────────────────────────────────────────────────── */
.contact{
  position:relative; overflow:hidden;
  padding:clamp(90px,13vh,150px) 0;
  background:linear-gradient(180deg,var(--bg),#070910);
  border-top:1px solid var(--line);
}
.contact-glow{
  position:absolute; inset:-20% -10% auto -10%; height:70%;
  background:radial-gradient(60% 60% at 50% 0%, rgba(59,130,246,.22), transparent 70%);
  pointer-events:none;
}
.contact .wrap{ position:relative; }
.contact h2{ margin-bottom:26px; }
.contact-sub{ max-width:36em; color:var(--ink-2); font-size:15.5px; line-height:1.95; }

.contacts{
  display:grid; grid-template-columns:repeat(3,1fr); gap:16px;
  margin-top:clamp(44px,7vh,70px);
}
.cbox{
  position:relative; overflow:hidden;
  padding:28px 26px; min-height:168px; border-radius:14px;
  border:1px solid var(--line);
  background:linear-gradient(180deg, rgba(255,255,255,.05), rgba(255,255,255,.012));
  display:flex; flex-direction:column; gap:10px;
  transition:transform .45s var(--ease), border-color .45s var(--ease), box-shadow .45s var(--ease);
}
a.cbox:hover{
  transform:translateY(-4px);
  border-color:rgba(124,200,255,.4);
  box-shadow:0 30px 70px -40px rgba(59,130,246,.9);
}
.ck{ font-family:var(--mono); font-size:10px; letter-spacing:.18em; color:var(--muted-2); }
.cv{ font-size:clamp(17px,1.5vw,20px); font-weight:600; color:#fff; word-break:break-all; letter-spacing:.01em; }
.ca{
  margin-top:auto; font-size:12.5px; color:var(--muted);
  display:inline-flex; align-items:center; gap:6px;
}
.ca i{ font-style:normal; transition:transform .35s var(--ease); }
a.cbox:hover .ca{ color:#9EC9FF; }
a.cbox:hover .ca i{ transform:translate(3px,-3px); }

.contact-fine{ margin-top:26px; font-size:12.5px; color:var(--muted-2); line-height:1.85; }

/* ── 页脚 ─────────────────────────────────────────────────── */
.foot{
  background:#04050A; border-top:1px solid var(--line);
  padding:46px 0 42px;
}
.foot-inner{
  display:grid; grid-template-columns:1.5fr 1fr auto;
  gap:32px; align-items:start;
}
.foot-brand{ display:flex; gap:12px; }
.foot-brand .brand-mark{ width:30px; height:30px; flex:none; }
.fname{ font-size:13.5px; color:var(--ink-2); letter-spacing:.01em; }
.fsub{
  font-family:var(--mono); font-size:9.5px; letter-spacing:.18em;
  color:var(--muted-2); margin-top:7px;
}
.foot-nav{ display:flex; flex-wrap:wrap; gap:20px; }
.foot-nav a{ font-size:13px; color:var(--muted); transition:color .3s ease; }
.foot-nav a:hover{ color:#fff; }
.foot-meta{ text-align:right; font-size:12px; color:var(--muted-2); line-height:2; }
.foot-meta a{ transition:color .3s ease; }
.foot-meta a:hover{ color:#fff; }

/* ── 滚动显现 ───────────────────────────────────────────────
   优先用 CSS 原生 scroll-driven animation（整页渲染/打印时全部可见）；
   不支持的浏览器由 JS 加 .io-reveal 走 IntersectionObserver 降级。 */
.js .io-reveal{
  opacity:0; transform:translateY(26px); filter:blur(6px);
  transition:opacity .95s var(--ease), transform .95s var(--ease), filter .95s var(--ease);
}
.js .io-reveal.in{ opacity:1; transform:none; filter:blur(0); }
.d1{ transition-delay:.08s; animation-delay:.08s; }
.d2{ transition-delay:.16s; animation-delay:.16s; }
.d3{ transition-delay:.24s; animation-delay:.24s; }

@supports (animation-timeline: view()){
  .js .reveal{
    opacity:1; transform:none; filter:none; transition:none;
    animation:revIn .9s var(--ease) both;
    animation-timeline:view();
    animation-range:entry 8% entry 52%;
  }
}
@keyframes revIn{
  from{ opacity:0; transform:translateY(26px); filter:blur(6px); }
  to{ opacity:1; transform:none; filter:blur(0); }
}

/* ── 响应式 ───────────────────────────────────────────────── */
@media (max-width:1120px){
  :root{ --gut:34px; }
  .cards{ grid-template-columns:repeat(2,1fr); }
  .stack{ grid-template-columns:1fr; }
  .runtime{ grid-template-columns:1fr; }
  .trace{ position:static; }
  .about{ grid-template-columns:1fr; }
  .foot-inner{ grid-template-columns:1fr; gap:26px; }
  .foot-meta{ text-align:left; }
}

@media (max-width:860px){
  .nav-links{
    position:fixed; inset:66px 0 auto 0;
    flex-direction:column; align-items:stretch; gap:0;
    padding:10px 24px 22px;
    background:rgba(6,7,12,.96);
    backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    opacity:0; visibility:hidden; transform:translateY(-10px);
    transition:opacity .3s ease, transform .3s ease, visibility .3s;
  }
  .nav-links.open{ opacity:1; visibility:visible; transform:none; }
  .nav-links > a{ padding:16px 0; border-bottom:1px solid var(--line); font-size:15px; }
  .nav-links > a:last-child{ border-bottom:0; }
  .nav-cta{ margin-top:16px; text-align:center; padding:14px 20px; }
  .nav-toggle{ display:block; }

  .hero{ min-height:auto; padding:130px 0 80px; }
  .hero-title{ font-size:clamp(40px,10vw,64px); }
  .hero-scroll{ display:none; }
  .mani-cols{ grid-template-columns:1fr; }
  .mani-cols p + p{ padding-left:0; border-left:0; padding-top:22px; border-top:1px solid var(--line); }
  .paths, .cases, .contacts{ grid-template-columns:1fr; }
  .steps::before{ display:none; }
  .step{ grid-template-columns:1fr; gap:14px; }
  .step-no{ width:56px; height:30px; }
}

@media (max-width:560px){
  :root{ --gut:22px; }
  .cards{ grid-template-columns:1fr; }
  .hero-stats li{ padding-right:20px; margin-right:20px; }
  .hero-stats li:nth-child(3), .hero-stats li:nth-child(4){ padding-top:14px; }
  .hero-stats{ gap:0; }
  .card, .path, .case, .cbox{ padding:26px 22px 24px; }
  .combo{ padding:22px; }
  .btn{ padding:14px 22px; font-size:14px; }
  .hero-actions .btn{ flex:1 1 auto; justify-content:center; }
  .path dl > div{ grid-template-columns:1fr; gap:4px; }
}

@media (prefers-reduced-motion:reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation:none !important; transition:none !important; }
  .js .io-reveal{ opacity:1; transform:none; filter:none; }
  .js .hero-title .grad-line{ opacity:1; transform:none; filter:none; }
  .js .hero-title .split > span{ opacity:1; transform:none; filter:none; }
  .hero-canvas{ display:none; }
}

@media print{
  .nav,.grain,.cursor,.hero-canvas,.hero-aurora,.marquee,.contact-glow,.hero-scroll{ display:none !important; }
  .js .io-reveal,.js .hero-title .grad-line,.js .hero-title .split > span{ opacity:1 !important; transform:none !important; filter:none !important; }
}