/* KOUPELL 官网 - 深色工业风 */
* { margin:0; padding:0; box-sizing:border-box; }
:root{
  --bg:#0a1220; --bg2:#0d1626; --panel:#121d30; --line:rgba(255,255,255,.09);
  --gold:#f5c400; --brass:#d8a94e; --text:#e8edf4; --muted:#9fb0c5; --dim:#6d8199;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.7;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}

/* ===== 导航 ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(10,18,32,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1200px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;padding:0 24px;height:64px}
.brand,.hero-brand{font-weight:800;font-size:24px;letter-spacing:2px;color:var(--text)}
.brand-k{color:var(--gold)}
.brand sup,.hero-brand sup{font-size:10px;color:var(--dim);margin-left:2px}
.menu{display:flex;gap:26px}
.menu a{font-size:14px;color:var(--muted);letter-spacing:1px;transition:.2s}
.menu a:hover{color:var(--gold)}
.nav-right{display:flex;align-items:center;gap:12px}
.lang-btn{background:transparent;border:1px solid var(--gold);color:var(--gold);border-radius:999px;padding:4px 12px;font-size:12px;font-weight:700;transition:.2s}
.lang-btn:hover{background:var(--gold);color:#0a1220}
.tel-pill{background:var(--gold);color:#0a1220;font-weight:700;font-size:13px;padding:6px 14px;border-radius:999px}
.burger{display:none;background:none;border:none}
.burger span{display:block;width:20px;height:2px;background:var(--text);margin:4px 0}

/* ===== Hero 等距3D园区 ===== */
.hero{position:relative;background:var(--bg);overflow:hidden}
.hero-stage{position:relative;overflow:hidden}
.hero-img{width:100%;height:auto;display:block}
.hero-inner{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;z-index:2;padding:80px 24px 0}
.hero-brand{font-size:clamp(30px,5vw,44px);letter-spacing:4px;color:#fff;text-shadow:0 2px 18px rgba(0,0,0,.45)}
.hero-cn{margin-top:8px;font-size:clamp(14px,2.4vw,20px);letter-spacing:6px;color:#e8eef7;text-shadow:0 2px 12px rgba(0,0,0,.5)}
.hero-slogan.mini{margin-top:12px;font-size:13px;letter-spacing:6px;color:var(--gold);font-weight:700}
.btn{padding:13px 34px;border-radius:999px;font-size:15px;font-weight:700;letter-spacing:2px;transition:.25s}
.btn-gold{background:var(--gold);color:#0a1220}
.btn-gold:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(245,196,0,.35)}
.btn-ghost{border:1px solid rgba(255,255,255,.35);color:var(--text)}
.btn-ghost:hover{border-color:var(--gold);color:var(--gold)}
.hero-hotspots{position:absolute;inset:0;z-index:3;pointer-events:none}
.hs{position:absolute;transform:translate(-50%,-50%);cursor:pointer;z-index:3}
.hs-dot{width:15px;height:15px;border-radius:50%;background:var(--gold);box-shadow:0 0 0 4px rgba(245,196,0,.25),0 2px 10px rgba(0,0,0,.5);position:relative;transition:.25s}
.hs-dot::after{content:"";position:absolute;inset:-7px;border-radius:50%;border:2px solid rgba(245,196,0,.65);animation:hsPulse 2s ease-out infinite}
@keyframes hsPulse{0%{transform:scale(.55);opacity:1}100%{transform:scale(1.7);opacity:0}}
.hs-label{position:absolute;bottom:22px;left:50%;transform:translateX(-50%);white-space:nowrap;background:rgba(8,15,26,.88);border:1px solid rgba(245,196,0,.5);color:var(--text);font-size:13px;letter-spacing:2px;padding:6px 14px;border-radius:999px;opacity:0;pointer-events:none;transition:.25s}
.hs:hover .hs-label,.hs.open .hs-label{opacity:1}
.hs:hover .hs-dot,.hs.open .hs-dot{background:#fff;box-shadow:0 0 0 6px rgba(255,255,255,.2)}
.hero-tip{position:absolute;left:26px;bottom:110px;z-index:4;background:rgba(8,15,26,.9);border:1px solid rgba(245,196,0,.5);border-radius:14px;padding:14px 18px;display:none;flex-direction:column;gap:6px;max-width:260px}
.hero-tip.open{display:flex}
.hero-tip b{color:var(--gold);font-size:15px;letter-spacing:2px}
.hero-tip a{color:var(--text);font-size:13px;letter-spacing:1px}
.hero-tip a:hover{color:var(--gold)}
.mini-cta{position:relative;z-index:2;display:flex;gap:12px;justify-content:center;margin:0 24px 20px}
.mini-cta .btn{padding:10px 26px;font-size:14px}
.hero-stats{position:relative;z-index:2;max-width:1100px;margin:0 auto;padding:0 24px 30px;display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.stat{flex:1;min-width:150px;background:rgba(18,29,48,.72);border:1px solid var(--line);border-radius:14px;padding:16px 10px;text-align:center}
.stat b{display:block;font-size:clamp(18px,2.6vw,26px);color:var(--gold);letter-spacing:1px}
.stat span{font-size:12px;color:var(--muted);letter-spacing:1px}

/* ===== 通用区块 ===== */
.section{padding:90px 0}
.section.alt{background:var(--bg2)}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.sec-head{text-align:center;margin-bottom:46px}
.sec-head.left{text-align:left}
.sec-head h2{font-size:clamp(26px,4vw,36px);letter-spacing:6px}
.sec-head h2::after{content:"";display:block;width:56px;height:3px;background:var(--gold);margin:14px auto 0;border-radius:2px}
.sec-head.left h2::after{margin-left:0}
.sec-head p{margin-top:14px;color:var(--muted);font-size:14px;letter-spacing:2px}

/* ===== 产品 ===== */
.filters{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:34px}
.pill{background:transparent;border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:8px 22px;font-size:14px;letter-spacing:1px;transition:.2s}
.pill:hover{border-color:var(--brass);color:var(--brass)}
.pill.active{background:var(--gold);border-color:var(--gold);color:#0a1220;font-weight:700}
.promo-card{display:flex;align-items:stretch;gap:0;background:var(--panel);border:1px solid rgba(245,196,0,.4);border-radius:16px;overflow:hidden;margin-bottom:30px;max-width:560px}
.promo-card img{width:46%;object-fit:cover}
.promo-text{padding:26px 22px;display:flex;flex-direction:column;justify-content:center;gap:8px}
.promo-text b{font-size:22px;color:var(--gold);letter-spacing:3px}
.promo-text span{color:var(--text);font-size:14px;letter-spacing:1px}
.promo-text em{font-style:normal;color:var(--dim);font-size:12px;letter-spacing:1px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:18px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;overflow:hidden;cursor:pointer;transition:.25s;animation:fadeIn .4s both}
.card:hover{transform:translateY(-5px);border-color:rgba(245,196,0,.55);box-shadow:0 14px 34px rgba(0,0,0,.45)}
.card .ph{aspect-ratio:3/4;display:flex;align-items:center;justify-content:center;background:#0e1728;overflow:hidden}
.card .ph img{width:100%;height:100%;object-fit:contain;transition:.3s}
.card:hover .ph img{transform:scale(1.05)}
.card .cap{padding:12px 14px;border-top:1px solid var(--line)}
.card .cap b{display:block;font-size:13px;letter-spacing:1px;color:var(--text);font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.card .cap span{font-size:11px;color:var(--dim);letter-spacing:1px}
@keyframes fadeIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}

/* ===== 视频 ===== */
.video-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px}
.video-card{position:relative;border-radius:16px;overflow:hidden;border:1px solid var(--line);background:#000;aspect-ratio:9/16;max-height:560px}
.video-card video{width:100%;height:100%;object-fit:contain;background:#000}
.v-cover{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;background:radial-gradient(circle at 50% 40%,#16273d,#0a1526 80%);cursor:pointer;transition:.3s}
.v-cover:hover{opacity:.85}
.play{width:64px;height:64px;border-radius:50%;background:rgba(245,196,0,.92);position:relative;box-shadow:0 0 0 8px rgba(245,196,0,.18)}
.play::after{content:"";position:absolute;left:26px;top:19px;border-left:22px solid #0a1220;border-top:13px solid transparent;border-bottom:13px solid transparent}
.v-cover b{color:var(--text);letter-spacing:2px;font-size:14px}

/* ===== 工厂 ===== */
.factory-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}
.f-card{position:relative;border-radius:14px;overflow:hidden;border:1px solid var(--line);cursor:pointer;background:var(--panel);transition:.25s;aspect-ratio:4/3}
.f-card img{width:100%;height:100%;object-fit:cover;transition:.35s}
.f-card:hover{border-color:rgba(245,196,0,.55)}
.f-card:hover img{transform:scale(1.06)}
.f-cap{position:absolute;left:0;right:0;bottom:0;padding:8px 12px;font-size:12px;letter-spacing:2px;color:#e8edf4;background:linear-gradient(transparent,rgba(5,10,18,.88));pointer-events:none}

/* ===== 关于 ===== */
.about-wrap{display:grid;grid-template-columns:1fr 300px;gap:46px;align-items:start}
.about-text p{color:var(--muted);font-size:15px;margin-bottom:18px;text-align:justify}
.about-badges{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.tag{border:1px solid rgba(245,196,0,.45);color:#f0d465;padding:6px 16px;border-radius:999px;font-size:12px;letter-spacing:2px}
.about-logo{background:#fff;border-radius:16px;padding:30px;display:flex;align-items:center;justify-content:center;border:1px solid var(--line)}
.about-logo img{border-radius:8px}

/* ===== 联系 ===== */
.contact-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:20px}
.contact-card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:30px 24px;text-align:center;display:flex;flex-direction:column;gap:10px;transition:.25s}
.contact-card:hover{border-color:rgba(245,196,0,.55);transform:translateY(-4px)}
.c-ico{font-size:30px}
.contact-card b{color:var(--muted);font-size:13px;letter-spacing:2px;font-weight:600}
.c-val{color:var(--text);font-size:15px;font-weight:700;letter-spacing:1px;word-break:break-all}

/* ===== 页脚 ===== */
.footer{border-top:1px solid var(--line);padding:26px 0;background:#060b14}
.foot-inner{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:center;color:var(--dim);font-size:12px;letter-spacing:1px}
.foot-sep{opacity:.4}

/* ===== 灯箱 ===== */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(4,8,15,.94);display:none;align-items:center;justify-content:center}
.lightbox.open{display:flex}
.lightbox img{max-width:82vw;max-height:82vh;object-fit:contain;border-radius:8px}
.lb-close{position:absolute;top:18px;right:26px;background:none;border:none;color:#fff;font-size:44px;line-height:1}
.lb-prev,.lb-next{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.08);border:1px solid var(--line);color:#fff;font-size:34px;width:52px;height:52px;border-radius:50%}
.lb-prev{left:22px}.lb-next{right:22px}
.lb-prev:hover,.lb-next:hover,.lb-close:hover{color:var(--gold)}
.lb-cap{position:absolute;bottom:26px;left:0;right:0;text-align:center;color:var(--muted);letter-spacing:2px;font-size:14px}

/* ===== 移动端 ===== */
@media (max-width:820px){
  .hero-img{height:440px;object-fit:cover}
  .menu{position:fixed;top:64px;right:0;flex-direction:column;background:rgba(10,18,32,.97);width:200px;padding:20px 26px;transform:translateX(110%);transition:.3s;border-left:1px solid var(--line);gap:18px}
  .menu.open{transform:none}
  .burger{display:block}
  .tel-pill{display:none}
  .about-wrap{grid-template-columns:1fr}
  .hero-stats .stat{min-width:calc(50% - 14px)}
  .promo-card{flex-direction:column;max-width:none}
  .promo-card img{width:100%}
  .section{padding:64px 0}
}