/* PIoT 展示中心 · 公共样式。配色、字体沿用课件模板和官网（深色科技风，品牌蓝 #025e9f）。 */
@font-face{font-family:"PIoT Han Sans";src:url(/assets/fonts/piot-han-400.woff2) format("woff2");font-weight:400;font-display:swap}
@font-face{font-family:"PIoT Han Sans";src:url(/assets/fonts/piot-han-700.woff2) format("woff2");font-weight:700;font-display:swap}

:root{
  --bg:#03060c; --bg2:#07101d; --panel:rgba(159,212,255,.05); --panel2:rgba(159,212,255,.09);
  --line:rgba(159,212,255,.14); --line2:rgba(159,212,255,.3);
  --ink:#eef4fb; --ink2:#a9b8cc; --ink3:#73859d;
  --brand:#025e9f; --hi:#2b8fd6; --ice:#9fd4ff; --ok:#2bd88f; --warn:#ffb454;
  --wrap:1360px; --gut:clamp(20px,5vw,72px);
  --font:"PIoT Han Sans","PingFang SC","Microsoft YaHei UI","Microsoft YaHei",system-ui,sans-serif;
  --mono:ui-monospace,"Cascadia Code",Consolas,"PIoT Han Sans",monospace;
  --ease:cubic-bezier(.16,1,.3,1);
  color-scheme:dark;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.7 var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}
img,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
[hidden]{display:none!important}
h1,h2,h3,p,dl,dd,ol{margin:0;padding:0}
ol{list-style:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
code{font-family:var(--mono);font-size:.92em;color:var(--ice)}
:focus-visible{outline:2px solid var(--ice);outline-offset:3px}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{animation:none!important;transition:none!important}}

.skip{position:fixed;left:16px;top:-60px;z-index:50;padding:8px 16px;background:var(--brand);border-radius:8px}
.skip:focus{top:12px}

/* 顶栏 */
.nav{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;height:68px;padding:0 var(--gut);
  background:rgba(3,6,12,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:14px;flex:none}
.brand img{height:30px;width:auto}
.brand span{padding-left:14px;border-left:1px solid var(--line2);font-size:15px;letter-spacing:.14em;color:var(--ink2);white-space:nowrap}
.nav nav{display:flex;align-items:center;gap:clamp(14px,2.4vw,34px);font-size:16px;color:var(--ink2)}
.nav nav a{transition:color .2s}
.nav nav a:hover{color:var(--ink)}
.nav .out::after,.foot-out::after{content:"↗";margin-left:3px;color:var(--ice)}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:0 26px;border-radius:10px;border:1px solid var(--line2);
  background:var(--panel);font-weight:700;font-size:16px;letter-spacing:.04em;transition:background .2s,border-color .2s,transform .2s var(--ease);white-space:nowrap}
.btn:hover{background:var(--panel2);border-color:rgba(159,212,255,.55);transform:translateY(-1px)}
.btn.primary{background:linear-gradient(180deg,#0f78c4,var(--brand));border-color:rgba(159,212,255,.45)}
.btn.primary:hover{background:linear-gradient(180deg,#1b8ad9,#056cb4)}

/* 首屏 */
.hero{position:relative;display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:clamp(28px,4vw,64px);
  max-width:calc(var(--wrap) + 2*var(--gut));margin:0 auto;padding:clamp(40px,6vw,84px) var(--gut) clamp(36px,5vw,64px)}
.hero::before{content:"";position:absolute;inset:-120px 0 auto auto;width:min(1100px,90vw);height:760px;pointer-events:none;z-index:-1;
  background:radial-gradient(ellipse 60% 55% at 62% 42%,rgba(2,94,159,.42),transparent 72%)}
.kicker{display:flex;align-items:center;gap:14px;font-size:15px;font-weight:700;letter-spacing:.2em;color:var(--ice);white-space:nowrap}
.kicker::before{content:"";flex:none;width:40px;height:2px;background:linear-gradient(90deg,var(--hi),transparent)}
.hero-copy{container-type:inline-size}
h1{margin-top:20px;font-size:clamp(36px,4.5vw,64px);line-height:1.2;font-weight:700;letter-spacing:.01em;
  background:linear-gradient(100deg,#fff 12%,#9fd4ff 62%,#3c9be6 100%);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-copy h1{font-size:clamp(30px,10.6cqi,64px)} /* 第二行 9 个字，要在左栏里放下不折行 */
.lead{margin-top:22px;max-width:30em;font-size:clamp(17px,1.4vw,19px);color:var(--ink2)}
.cta{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}

.stage{margin:0;animation:rise .9s var(--ease) both}
@keyframes rise{from{opacity:0;transform:translateY(18px)}}
.display{position:relative;aspect-ratio:16/9;overflow:hidden;border-radius:14px 14px 0 0;background:#000;border:1px solid var(--line2);border-bottom:0;
  box-shadow:0 30px 90px rgba(2,94,159,.38)}
.display video,.display img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.display .dark{position:absolute;inset:0;background:#000}
.transport{display:grid;grid-template-columns:auto auto minmax(0,1fr) auto;align-items:center;gap:6px 12px;padding:14px 18px 12px;border:1px solid var(--line2);border-top:0;
  border-radius:0 0 14px 14px;background:linear-gradient(180deg,rgba(14,30,54,.9),rgba(8,16,30,.96));font-size:15px}
.transport .state{color:var(--ink2);white-space:nowrap}
.transport .title{min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-weight:700}
.transport .pos{font-family:var(--mono);font-size:14px;color:var(--ice);white-space:nowrap}
.bar{grid-column:1/-1;display:block;height:3px;border-radius:2px;background:rgba(159,212,255,.14);overflow:hidden}
.bar b{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--hi),var(--ice));transition:width .6s linear}
.dot{display:inline-block;flex:none;width:10px;height:10px;border-radius:50%;background:var(--ink3)}
.dot.on{background:var(--ok);box-shadow:0 0 0 0 rgba(43,216,143,.6);animation:pulse 2s infinite}
@keyframes pulse{70%{box-shadow:0 0 0 9px rgba(43,216,143,0)}100%{box-shadow:0 0 0 0 rgba(43,216,143,0)}}

/* 指标 */
.proof{display:grid;grid-template-columns:repeat(6,1fr);max-width:calc(var(--wrap) + 2*var(--gut));margin:0 auto;padding:0 var(--gut)}
.proof div{padding:22px 18px 22px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.proof b{display:block;font-size:clamp(26px,2.8vw,40px);line-height:1.15;white-space:nowrap}
.proof small{font-size:.48em;font-weight:400;color:var(--ice)}
.proof span{display:block;margin-top:4px;font-size:14px;color:var(--ink3)}

/* 版块 */
.section{max-width:calc(var(--wrap) + 2*var(--gut));margin:0 auto;padding:clamp(56px,8vw,112px) var(--gut) 0}
.head{max-width:44em;margin-bottom:clamp(26px,3.4vw,44px)}
h2{margin-top:14px;font-size:clamp(28px,3.2vw,46px);line-height:1.25;font-weight:700;letter-spacing:.01em}
.head>p:last-child{margin-top:12px;color:var(--ink2)}

/* 产品 */
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.tile{position:relative;grid-column:span 2;display:flex;flex-direction:column;min-height:340px;padding:24px;overflow:hidden;border:1px solid var(--line);border-radius:14px;
  background:radial-gradient(ellipse 80% 70% at 50% 18%,rgba(2,94,159,.24),transparent 75%),linear-gradient(180deg,rgba(14,30,54,.6),rgba(8,16,30,.9));
  transition:border-color .25s,transform .25s var(--ease)}
.tile.wide{grid-column:span 3;min-height:430px}
.tile:hover{border-color:var(--line2);transform:translateY(-3px)}
.tile img{flex:1 1 0;min-height:0;width:100%;object-fit:contain;transition:transform .5s var(--ease)}
.tile:hover img{transform:scale(1.03)}
.tile .txt{display:block;margin-top:16px}
.tile .txt b{display:block;font-size:21px;line-height:1.35}
.tile .txt span{display:block;margin-top:4px;font-size:15px;line-height:1.6;color:var(--ink2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.chips i{font-style:normal;font-size:14px;line-height:1;padding:7px 10px;border-radius:999px;border:1px solid var(--line2);color:var(--ice);white-space:nowrap}

/* 课件 */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.card{position:relative;display:flex;flex-direction:column;overflow:hidden;border-radius:12px;border:1px solid var(--line);border-top:3px solid var(--accent,var(--brand));
  background:linear-gradient(180deg,rgba(14,30,54,.82),rgba(8,16,30,.92));transition:transform .25s var(--ease),box-shadow .25s,border-color .25s}
.card:hover,.card.sel{transform:translateY(-4px);border-color:rgba(159,212,255,.6);box-shadow:0 14px 40px rgba(43,143,214,.26)}
.card .pic{position:relative;display:block;aspect-ratio:16/9;background:#000;overflow:hidden}
.card .pic img{width:100%;height:100%;object-fit:cover}
.card .no{position:absolute;left:12px;top:8px;font-size:17px;font-weight:700;letter-spacing:.06em;text-shadow:0 2px 8px rgba(0,0,0,.7)}
.card .t{display:block;padding:14px 16px 0;font-size:19px;line-height:1.35;font-weight:700}
.card .s{display:block;padding:4px 16px 0;font-size:14.5px;line-height:1.55;color:var(--ink2)}
.card .meta{display:flex;flex-wrap:wrap;gap:6px 12px;margin-top:auto;padding:12px 16px 14px;font-size:14px;color:var(--ink3)}
.card .meta i{font-style:normal;white-space:nowrap}
.intro{display:flex;align-items:center;gap:22px;margin-top:18px;padding:0 24px 0 0;min-height:100px;overflow:hidden;border-radius:12px;border:1px solid var(--line);border-left:3px solid var(--hi);
  background:linear-gradient(90deg,rgba(2,94,159,.26),rgba(8,16,30,.92));transition:border-color .25s,transform .25s var(--ease)}
.intro:hover,.intro.sel{border-color:rgba(159,212,255,.6);transform:translateY(-2px)}
.intro img{flex:none;width:178px;height:100px;object-fit:cover}
.intro .txt{flex:1;min-width:0}
.intro .t{display:block;font-size:19px;font-weight:700;line-height:1.35}
.intro .s{display:block;font-size:14.5px;color:var(--ink2);line-height:1.55}
.intro .meta{flex:none;font-size:14px;color:var(--ink3);white-space:nowrap}

/* 影片 */
.films{display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.film{display:block;width:100%;text-align:left;border-radius:10px}
.film .pic{position:relative;display:block;aspect-ratio:16/9;overflow:hidden;border-radius:10px;border:1px solid var(--line);background:#000;transition:border-color .25s}
.film .pic img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.film:hover .pic{border-color:var(--line2)}
.film:hover .pic img{transform:scale(1.04)}
.film .pic::after{content:"";position:absolute;left:50%;top:50%;width:0;height:0;margin:-12px 0 0 -7px;border-left:20px solid #fff;border-top:12px solid transparent;border-bottom:12px solid transparent;
  opacity:0;transition:opacity .2s;filter:drop-shadow(0 2px 8px rgba(0,0,0,.7))}
.film:hover .pic::after,.film:focus-visible .pic::after{opacity:1}
.film .dur{position:absolute;right:8px;bottom:8px;padding:1px 7px;border-radius:5px;background:rgba(3,6,12,.75);font:400 13px/1.5 var(--mono)}
.film .t{display:block;margin-top:10px;font-size:16px;line-height:1.4;font-weight:700}
.film .s{display:block;margin-top:2px;font-size:14px;line-height:1.5;color:var(--ink3)}

dialog{width:min(1180px,calc(100vw - 32px));padding:0;border:1px solid var(--line2);border-radius:14px;background:#04070e;color:var(--ink)}
dialog::backdrop{background:rgba(1,3,7,.82);backdrop-filter:blur(6px)}
.player-head{display:flex;align-items:center;justify-content:space-between;padding:10px 12px 10px 18px}
.player-head button{width:40px;height:40px;border-radius:8px;font-size:26px;line-height:1;color:var(--ink2)}
.player-head button:hover{background:var(--panel2);color:var(--ink)}
dialog video{width:100%;aspect-ratio:16/9;background:#000}

/* 大屏 */
.live{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:18px}
.panel{padding:22px 24px 24px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,rgba(14,30,54,.6),rgba(8,16,30,.9));min-width:0}
.panel h3{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:15px;font-weight:700;letter-spacing:.08em;color:var(--ink3)}
.panel h3 a{font-size:14px;letter-spacing:0;color:var(--ice)}
.panel dl{margin-top:10px}
.panel dl div{display:grid;grid-template-columns:4.2em minmax(0,1fr);gap:12px;padding:9px 0;border-bottom:1px solid var(--line)}
.panel dt{color:var(--ink3);font-size:15px}
.panel dd{display:flex;align-items:center;gap:8px;min-width:0;overflow-wrap:anywhere}
.panel .row{display:flex;flex-wrap:wrap;gap:12px;margin-top:20px}
.code pre{margin:14px 0 0;height:min(320px,60vw);overflow:auto;font:400 14px/1.65 var(--mono);color:var(--ink2);white-space:pre-wrap;overflow-wrap:anywhere}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:18px;counter-reset:s}
.steps li{counter-increment:s;padding:20px 24px;border:1px solid var(--line);border-radius:14px}
.steps b{display:block;font-size:18px}
.steps b::before{content:counter(s,decimal-leading-zero);margin-right:10px;font:400 15px var(--mono);color:var(--ice)}
.steps span{display:block;margin-top:6px;font-size:15px;line-height:1.65;color:var(--ink2)}

/* 页脚 */
.footer{display:grid;grid-template-columns:1fr auto;gap:18px 32px;align-items:center;max-width:calc(var(--wrap) + 2*var(--gut));margin:clamp(64px,8vw,112px) auto 0;padding:34px var(--gut) 40px;border-top:1px solid var(--line)}
.footer img{height:28px;width:auto}
.footer p{margin-top:8px;font-size:14px;color:var(--ink3)}
.footer nav{display:flex;flex-wrap:wrap;gap:12px 26px;font-size:15px;color:var(--ink2)}
.footer nav a:hover{color:var(--ink)}
.footer .fine{grid-column:1/-1;margin:0;font-size:13px}
.footer .fine a:hover{color:var(--ink2)}

/* 文档页 */
.doc{max-width:940px;margin:0 auto;padding:clamp(36px,6vw,72px) var(--gut) 0}
.doc h1{font-size:clamp(30px,4vw,48px)}
.doc h2{margin-top:44px;font-size:clamp(23px,2.4vw,30px)}
.doc h3{margin-top:26px;font-size:18px}
.doc p,.doc li{color:var(--ink2)}
.doc p{margin-top:10px}
.doc ul{margin:10px 0 0;padding-left:1.3em}
.doc pre{margin:12px 0 0;padding:14px 16px;border:1px solid var(--line);border-radius:10px;background:var(--panel);font:400 14px/1.6 var(--mono);color:var(--ink);overflow:auto}
.doc .table{margin-top:12px;overflow-x:auto;-webkit-overflow-scrolling:touch}
.doc table{width:100%;min-width:560px;border-collapse:collapse;font-size:15px}
.doc th,.doc td{padding:9px 12px 9px 0;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;color:var(--ink2)}
.doc th{color:var(--ink3);font-weight:400;white-space:nowrap}
.doc td code{white-space:nowrap}

/* 404 */
.blank{min-height:calc(100vh - 68px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:18px;padding:24px;text-align:center}
.blank h1{margin:0}

@media (max-width:1180px){
  .films{grid-template-columns:repeat(4,1fr)}
  .proof{grid-template-columns:repeat(3,1fr)}
  .proof div:nth-child(n+4){border-top:0}
}
@media (max-width:980px){
  .hero{grid-template-columns:minmax(0,1fr)}
  .cards{grid-template-columns:repeat(3,1fr)}
  .films{grid-template-columns:repeat(3,1fr)}
  .tile,.tile.wide{grid-column:span 3;min-height:320px}
  .live,.steps{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:720px){
  body{font-size:16px}
  .nav{height:60px;gap:12px}
  .brand img{height:24px}
  .brand span{display:none}
  .nav nav{gap:14px;font-size:15px}
  .cards,.films{grid-template-columns:repeat(2,1fr);gap:12px}
  .tile,.tile.wide{grid-column:1/-1;min-height:300px;padding:18px}
  .card .t{font-size:16px;padding:10px 12px 0}
  .card .s{font-size:13.5px;padding:3px 12px 0}
  .card .meta{padding:8px 12px 10px;font-size:13px;gap:4px 10px}
  .intro{gap:14px;padding-right:14px}
  .intro img{width:120px;height:92px}
  .intro .meta{display:none}
  .transport{grid-template-columns:auto minmax(0,1fr) auto;font-size:14px}
  .transport .state{grid-column:2;grid-row:1}
  .transport .title{grid-column:1/-1;grid-row:2}
  .transport .pos{grid-column:3;grid-row:1}
  .bar{grid-row:3}
  .footer{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:400px){
  .nav nav a:nth-child(3){display:none}
}