/* ASCREEN 思科云 - 深色科技风 */
:root{
  --bg:#080c18; --bg2:#0d1424; --panel:#111a2e; --line:rgba(120,170,255,.12);
  --txt:#e8eefc; --muted:#8b9bbd; --acc:#00d4ff; --acc2:#2979ff;
  --grad:linear-gradient(120deg,#00d4ff,#2979ff 60%,#7c4dff);
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,-apple-system,"Microsoft YaHei",sans-serif;background:var(--bg);color:var(--txt);line-height:1.75;font-size:16px;overflow-x:hidden}
img,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* ---------- 导航 ---------- */
.nav{position:fixed;inset:0 0 auto 0;z-index:100;transition:.3s;background:transparent}
.nav.scrolled{background:rgba(8,12,24,.85);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;gap:28px;padding:16px 24px}
.logo{font-weight:900;font-size:22px;letter-spacing:1px;display:flex;align-items:baseline;gap:2px}
.logo span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.logo small{font-size:12px;color:#c3d0ea;margin-left:8px;font-weight:400;letter-spacing:3px;text-shadow:0 1px 8px rgba(0,0,0,.5)}
.nav-links{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.nav-link{padding:8px 14px;border-radius:8px;font-size:14.5px;color:#e3ebfb;text-shadow:0 1px 8px rgba(0,0,0,.5);transition:.2s}
.nav-link:hover{color:#fff;background:rgba(120,170,255,.14)}
.nav-link.active{color:var(--txt);background:rgba(0,212,255,.12);box-shadow:inset 0 0 0 1px rgba(0,212,255,.25)}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:8px;padding:10px;cursor:pointer}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--txt);margin:4px 0;border-radius:2px}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;overflow:hidden}
.hero video{position:absolute;inset:0;width:100%;height:100%;max-height:none;object-fit:cover;opacity:1;margin:0;border:none}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(90deg,rgba(8,12,24,.5),rgba(8,12,24,0) 55%),linear-gradient(180deg,rgba(8,12,24,.15),rgba(8,12,24,.5) 85%),radial-gradient(60% 60% at 70% 30%,rgba(41,121,255,.18),transparent)}
.hero-inner{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:120px 24px 80px}
.hero-kicker{letter-spacing:6px;font-size:13px;color:var(--acc);margin-bottom:18px;font-weight:500}
.hero h1{font-size:clamp(38px,6vw,72px);font-weight:900;line-height:1.15;letter-spacing:1px;text-shadow:0 2px 18px rgba(0,0,0,.55),0 1px 3px rgba(0,0,0,.4)}
.hero h1 em{font-style:normal;background:linear-gradient(115deg,#3df6ff 0%,#7dffa8 25%,#ffe95c 50%,#ff8ce0 75%,#3df6ff 100%);background-size:200% auto;-webkit-background-clip:text;background-clip:text;color:transparent;filter:drop-shadow(0 2px 16px rgba(120,220,255,.45));animation:heroFlow 6s linear infinite}
@keyframes heroFlow{to{background-position:200% center}}
.hero-sub{margin:22px 0 34px;color:var(--muted);font-size:clamp(15px,1.6vw,18px);max-width:640px;text-shadow:0 1px 10px rgba(0,0,0,.5)}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 30px;border-radius:999px;background:var(--grad);color:#fff;font-weight:700;font-size:15px;transition:.25s;box-shadow:0 8px 30px rgba(41,121,255,.35)}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 40px rgba(0,212,255,.45)}
.btn.ghost{background:transparent;box-shadow:inset 0 0 0 1.5px rgba(140,180,255,.35);color:var(--txt)}
.btn.ghost:hover{box-shadow:inset 0 0 0 1.5px var(--acc)}

/* ---------- 区块 ---------- */
.sec{padding:88px 24px;position:relative}
.sec.alt{background:var(--bg2)}
.wrap{max-width:1200px;margin:0 auto}
.sec-title{font-size:clamp(26px,3.4vw,38px);font-weight:900;margin-bottom:14px;letter-spacing:1px}
.sec-title::after{content:"";display:block;width:56px;height:4px;margin-top:14px;border-radius:2px;background:var(--grad)}
.sec-desc{color:var(--muted);margin-bottom:40px}
.content p{margin:14px 0;color:#c6d3ec;max-width:820px}
.content img.fig{width:100%;border-radius:14px;margin:20px 0;display:block;box-shadow:0 10px 40px rgba(0,0,0,.35)}
.content img.narrow{max-width:640px;margin-left:auto;margin-right:auto}
/* 研发中心页：图文全部居中 */
.content.yf{text-align:center}
.content.yf img.fig{max-width:940px;margin-left:auto;margin-right:auto}
.content.yf .callout{text-align:center;border-left:none;border:1px solid rgba(0,212,255,.22);border-radius:14px;background:linear-gradient(180deg,rgba(0,212,255,.07),rgba(0,212,255,.02))}
/* LED 产品目录（对齐线上结构） */
.prod-block{text-align:center;margin:44px 0}
.prod-block p{max-width:none;margin-left:auto;margin-right:auto}
.prod-block img{display:block;margin:0 auto;max-height:400px;width:auto;max-width:100%;border-radius:14px;box-shadow:0 10px 40px rgba(0,0,0,.35)}
.prod-block h2{margin-top:20px;font-size:clamp(22px,2.6vw,30px)}
.prod-block h3{margin-top:4px;font-size:17px;color:#dbe6fa;font-weight:600}
.prod-block .spec{color:var(--acc);margin-top:8px;font-size:15.5px;letter-spacing:.5px}
.prod-block .prod-feats{margin-top:10px;color:var(--muted);font-size:14.5px}
.content .sec-title{margin-top:34px}
.content .sub-title{margin:28px 0 8px;color:var(--acc);font-size:20px}
.muted{color:var(--muted)}
.muted-p{color:var(--muted);margin:16px 0 26px}

/* ---------- 卡片 ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(270px,1fr));gap:22px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:.3s;display:block}
.card:hover{transform:translateY(-6px);border-color:rgba(0,212,255,.4);box-shadow:0 18px 50px rgba(0,0,0,.45)}
.card-img{height:190px;background-size:cover;background-position:center;transition:.4s;filter:saturate(1.05)}
.card:hover .card-img{transform:scale(1.04)}
.card-body{padding:20px 22px 24px}
.card-body h3{font-size:19px;margin-bottom:8px}
.card-body p{color:var(--muted);font-size:14px;min-height:42px}
.more{display:inline-block;margin-top:12px;color:var(--acc);font-size:14px;font-weight:500}

/* ---------- 页头 ---------- */
.page-hero{min-height:46vh;display:flex;align-items:flex-end;background-size:cover;background-position:center;position:relative;border-bottom:1px solid var(--line)}
.page-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(8,12,24,.25),rgba(8,12,24,.55))}
.ph-inner{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:140px 24px 44px;width:100%}
.page-hero h1{font-size:clamp(30px,4.5vw,52px);font-weight:900;text-shadow:0 2px 18px rgba(0,0,0,.55)}
.page-hero p{color:#cdd9f4;margin-top:10px;font-size:16px;text-shadow:0 1px 10px rgba(0,0,0,.6)}

/* ---------- 图集 / 视频 ---------- */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px}
.g-item{border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--panel);cursor:zoom-in}
.g-item img{width:100%;height:230px;object-fit:cover;transition:.35s}
.g-item:hover img{transform:scale(1.05)}
video{width:auto;max-width:100%;max-height:72vh;border-radius:12px;border:1px solid var(--line);background:#000;margin:10px auto}
.block-video{margin:18px auto}

/* ---------- 引用 / 列表 / 统计 ---------- */
.callout{border-left:3px solid var(--acc);background:linear-gradient(90deg,rgba(0,212,255,.08),transparent);padding:16px 22px;border-radius:0 12px 12px 0;margin:18px 0;color:#c6d3ec;font-size:16.5px}
.feat-list{margin:14px 0 14px 4px;list-style:none}
.feat-list li{padding:7px 0 7px 26px;position:relative;color:#c6d3ec}
.feat-list li::before{content:"▸";position:absolute;left:4px;color:var(--acc)}
.about-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:48px;align-items:start}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 26px;margin-bottom:14px}
.stat b{font-size:34px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:900}
.stat b span{font-size:18px}
.stat i{display:block;color:var(--muted);font-style:normal;font-size:13.5px;margin-top:2px}
.strip{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;margin:26px 0 30px}
.strip-item{border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.strip-item img{height:140px;width:100%;object-fit:cover}

/* ---------- Footer ---------- */
.footer{border-top:1px solid var(--line);background:#060a14;padding:56px 24px 0}
.footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:32px}
.footer h4{font-size:14px;color:var(--txt);margin-bottom:14px;letter-spacing:2px}
.footer a{display:block;color:var(--muted);font-size:14px;padding:4px 0;transition:.2s}
.footer a:hover{color:var(--acc)}
.footer-bottom{max-width:1200px;margin:36px auto 0;padding:18px 0;border-top:1px solid var(--line);font-size:13px}

/* ---------- Lightbox ---------- */
.lightbox{position:fixed;inset:0;background:rgba(4,7,14,.94);display:none;align-items:center;justify-content:center;z-index:200}
.lightbox.open{display:flex}
.lightbox img{max-width:92vw;max-height:88vh;border-radius:8px}
.lb-close{position:absolute;top:20px;right:30px;font-size:40px;color:#fff;background:none;border:none;cursor:pointer}

/* ---------- 动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:.7s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
/* ---------- 显示比例适配 ---------- */
/* 超宽屏 / 2K+（2560×1440、3440×21:9）：容器放宽 */
@media(min-width:1680px){
  .wrap,.nav-inner,.hero-inner,.ph-inner{max-width:1360px}
}
/* 矮宽笔记本（1366×768、1600×900，视口高不足）：压缩 hero 纵向，保证按钮完整可见 */
@media(min-width:901px) and (max-height:840px){
  .hero-inner{padding:100px 24px 48px}
  .hero-kicker{margin-bottom:12px}
  .hero h1{font-size:clamp(34px,4.2vw,54px)}
  .hero-sub{margin:16px 0 24px}
}
/* 中窄宽度（iPad 横屏 1024、1152 小笔记本）：导航收紧防折行 */
@media(min-width:901px) and (max-width:1200px){
  .nav-inner{gap:14px;padding:12px 18px}
  .nav-link{padding:7px 9px;font-size:13.5px}
  .logo{font-size:19px}
  .logo small{display:none}
}

@media(max-width:900px){
  .nav-links{position:fixed;top:60px;right:12px;left:12px;background:var(--panel);border:1px solid var(--line);border-radius:14px;flex-direction:column;padding:12px;display:none}
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .about-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr 1fr}
  .sec{padding:60px 18px}
}
@media(max-width:520px){.footer-inner{grid-template-columns:1fr}}