/* ============================================================
   重庆颂歌能源科技有限公司 · 官网样式
   深色工业科技风：深空蓝底 + 青绿能源主色 + 琥珀火焰辅色
   纯手写、零外部依赖，适配国内访问
   ============================================================ */

:root{
  --bg:#070d16;
  --bg-2:#0a121e;
  --bg-3:#0d1826;
  --panel:#111e2d;
  --panel-2:#17283b;
  --panel-3:#1e3248;
  --line:rgba(140,180,220,.16);
  --line-strong:rgba(140,180,220,.32);
  --text:#eef4fb;
  --text-2:#c6d5e6;
  --muted:#93a8be;
  --brand:#00d3b4;
  --brand-2:#12b7f5;
  --brand-3:#3f6ef5;
  --flame:#ff9130;
  --grad-brand:linear-gradient(115deg,#00d3b4 0%,#12b7f5 52%,#3f6ef5 100%);
  --grad-flame:linear-gradient(115deg,#ff9130 0%,#ff5f6d 100%);
  --r-s:8px; --r:14px; --r-l:22px;
  --shadow:0 20px 60px -22px rgba(0,0,0,.85);
  --glow:0 0 0 1px rgba(0,211,180,.22),0 18px 50px -20px rgba(0,211,180,.3);
  --maxw:1240px;
  --header-h:74px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:ui-monospace,SFMono-Regular,Consolas,"Liberation Mono",Menlo,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 18px);-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:16px;line-height:1.8;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
h1,h2,h3,h4,p,ul,figure{margin-top:0}
ul{padding-left:0;list-style:none}
::selection{background:rgba(0,211,180,.32);color:#fff}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}
.skip-link{position:absolute;left:-9999px;top:0;z-index:999;background:var(--brand);color:#04121a;padding:10px 18px;border-radius:0 0 8px 0;font-weight:700}
.skip-link:focus{left:0}

.container{width:min(100% - 48px,var(--maxw));margin-inline:auto}
.section{position:relative;padding:108px 0}
.section-alt{background:linear-gradient(180deg,rgba(13,24,38,.85),rgba(7,13,22,.4) 55%,rgba(13,24,38,.7));border-block:1px solid var(--line)}
.grad-text{background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent}

.eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 18px;font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--brand);font-family:var(--mono);text-transform:uppercase}
.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:var(--brand);box-shadow:0 0 0 5px rgba(0,211,180,.12),0 0 16px var(--brand);flex:none}

.section-head{display:grid;grid-template-columns:1.25fr .9fr;gap:48px;align-items:end;margin-bottom:64px}
.section-head h2{margin:0;font-size:clamp(30px,3.4vw,46px);line-height:1.32;letter-spacing:-.02em;font-weight:800}
.section-lead{margin:0;color:var(--text-2);font-size:16px;line-height:1.95;padding-bottom:4px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;border:1px solid transparent;transition:transform .25s ease,box-shadow .25s ease,background .25s ease,color .25s ease;white-space:nowrap}
.btn span{transition:transform .25s ease}
.btn:hover span{transform:translateX(4px)}
.btn-primary{background:var(--grad-brand);color:#04131c;box-shadow:0 12px 34px -14px rgba(0,211,180,.75)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px -14px rgba(0,211,180,.9)}
.btn-ghost{border-color:var(--line-strong);color:var(--text);background:rgba(255,255,255,.03);backdrop-filter:blur(6px)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);transform:translateY(-2px)}
.btn-block{width:100%}

.text-link{display:inline-flex;align-items:center;gap:8px;margin-top:26px;color:var(--brand);font-weight:700;font-size:15px;border-bottom:1px solid rgba(0,211,180,.35);padding-bottom:5px;transition:gap .2s ease,border-color .2s ease}
.text-link:hover{gap:14px;border-color:var(--brand)}
.fine-print{margin:16px 0 0;font-size:12.5px;color:var(--muted);line-height:1.8}
.chip-row{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}
.chip-row span{display:inline-block;padding:5px 13px;border:1px solid var(--line);border-radius:999px;font-size:12.5px;color:var(--text-2);background:rgba(255,255,255,.025)}
.chip-row .chip-accent{border-color:rgba(0,211,180,.5);color:var(--brand);background:rgba(0,211,180,.08)}

/* ---------- 页头 ---------- */
.site-header{position:fixed;inset:0 0 auto;z-index:100;height:var(--header-h);background:rgba(7,13,22,.72);border-bottom:1px solid var(--line);backdrop-filter:blur(16px) saturate(1.4);transition:background .3s ease,border-color .3s ease}
.site-header.scrolled{background:rgba(7,13,22,.94);border-color:var(--line-strong)}
.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:inline-flex;align-items:center;gap:11px;flex:none}
.brand-mark{width:40px;height:40px;display:grid;place-items:center;color:var(--brand);filter:drop-shadow(0 0 12px rgba(0,211,180,.45))}
.brand-mark svg{width:100%;height:100%}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:17px;letter-spacing:.04em}
.brand-text small{font-size:9px;letter-spacing:.16em;color:var(--muted);font-family:var(--mono);margin-top:3px}
.main-nav{display:flex;align-items:center;gap:6px}
.nav-link{position:relative;padding:8px 14px;font-size:14.5px;color:var(--text-2);border-radius:8px;transition:color .2s ease,background .2s ease}
.nav-link::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform .25s ease;border-radius:2px}
.nav-link:hover,.nav-link.active{color:var(--text)}
.nav-link.active::after{transform:scaleX(1)}
.nav-cta{margin-left:10px;padding:9px 18px;border:1px solid rgba(0,211,180,.5);color:var(--brand);background:rgba(0,211,180,.07);border-radius:999px;font-weight:700}
.nav-cta::after{display:none}
.nav-cta:hover{background:rgba(0,211,180,.16)}
.header-progress{position:absolute;left:0;bottom:-1px;height:2px;width:0;background:var(--grad-brand);box-shadow:0 0 12px rgba(0,211,180,.7)}
.nav-toggle{display:none;width:42px;height:42px;border:1px solid var(--line-strong);border-radius:10px;background:rgba(255,255,255,.03);padding:11px 9px;flex-direction:column;justify-content:space-between}
.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:2px;transition:transform .25s ease,opacity .25s ease}
.nav-toggle[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- 首屏 ---------- */
.hero{position:relative;min-height:min(920px,100vh);display:flex;align-items:center;padding:calc(var(--header-h) + 70px) 0 100px;overflow:hidden}
.hero-media{position:absolute;inset:0;z-index:0}
.hero-media>img{width:100%;height:100%;object-fit:cover;object-position:center 45%;filter:saturate(.82) contrast(1.06) brightness(.72)}
.hero-veil{position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,11,20,.97) 0%,rgba(6,11,20,.88) 34%,rgba(6,11,20,.48) 68%,rgba(6,11,20,.65) 100%),linear-gradient(0deg,var(--bg) 0%,rgba(7,13,22,0) 32%,rgba(7,13,22,.35) 100%)}
.hero-grid{position:absolute;inset:0;opacity:.3;background-image:linear-gradient(rgba(120,190,220,.075) 1px,transparent 1px),linear-gradient(90deg,rgba(120,190,220,.075) 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(90deg,#000,transparent 78%)}
.hero-orb{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none}
.hero-orb-a{width:420px;height:420px;right:6%;top:12%;background:rgba(0,211,180,.16)}
.hero-orb-b{width:340px;height:340px;right:28%;bottom:2%;background:rgba(63,110,245,.14)}
.hero-inner{position:relative;z-index:1;display:grid;grid-template-columns:1.18fr .82fr;gap:64px;align-items:center}
.hero-copy h1{margin:0 0 24px;font-size:clamp(42px,5.4vw,74px);line-height:1.18;font-weight:800;letter-spacing:-.035em;text-shadow:0 8px 40px rgba(0,0,0,.5)}
.hero-lead{max-width:600px;margin:0 0 34px;color:var(--text-2);font-size:17px;line-height:2}
.hero-lead strong{color:var(--text);font-weight:700}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:38px;max-width:620px}
.hero-chips span{font-size:12px;color:var(--muted);padding:5px 12px;border:1px solid var(--line);border-radius:6px;background:rgba(9,18,30,.55)}
.hero-stats{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.stat-card{position:relative;padding:22px 20px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(150deg,rgba(20,36,54,.85),rgba(9,17,28,.8));backdrop-filter:blur(10px);box-shadow:var(--shadow);overflow:hidden}
.stat-card::before{content:"";position:absolute;inset:0 auto auto 0;width:60%;height:2px;background:var(--grad-brand);opacity:.7}
.stat-num{font-family:var(--mono);font-size:40px;font-weight:800;line-height:1;color:var(--text);letter-spacing:-.04em}
.stat-unit{font-size:14px;color:var(--brand);font-weight:700;margin-left:6px}
.stat-card p{margin:10px 0 0;font-size:13px;color:var(--muted)}
.stat-wide{grid-column:1/-1;display:flex;align-items:center;gap:16px;padding:18px 20px}
.stat-wide-icon{font-size:28px;color:var(--brand);line-height:1}
.stat-wide strong{font-size:15px}
.stat-wide p{margin:4px 0 0;font-size:12.5px}
.scroll-hint{position:absolute;left:50%;bottom:26px;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;font-family:var(--mono);font-size:10px;letter-spacing:.3em;color:var(--muted)}
.scroll-line{width:1px;height:38px;background:linear-gradient(var(--brand),transparent);animation:scrollPulse 2.2s ease-in-out infinite}
@keyframes scrollPulse{0%,100%{opacity:.35;transform:scaleY(.7)}50%{opacity:1;transform:scaleY(1)}}

/* ---------- 产品板块 ---------- */
.product-block{display:grid;grid-template-columns:1.03fr 1fr;gap:64px;align-items:center;padding:54px 0;border-top:1px solid var(--line)}
.product-block:first-of-type{border-top:0;padding-top:0}
.product-block.reverse .pb-media{order:2}
.product-block.reverse .pb-body{order:1}
.pb-media{position:relative;padding:0 0 76px 0}
.pb-main-img{position:relative;border:1px solid var(--line-strong);border-radius:var(--r-l);overflow:hidden;box-shadow:var(--shadow);aspect-ratio:3/2;background:var(--panel)}
.pb-main-img::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,14,24,0) 55%,rgba(6,14,24,.42));pointer-events:none}
.pb-main-img img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.product-block:hover .pb-main-img img{transform:scale(1.045)}
.pb-thumb{position:absolute;bottom:0;width:31%;aspect-ratio:4/3;border:3px solid var(--bg);border-radius:12px;overflow:hidden;box-shadow:0 14px 34px -12px rgba(0,0,0,.9);z-index:2;background:var(--panel)}
.pb-thumb img{width:100%;height:100%;object-fit:cover;filter:saturate(.82) contrast(1.06) brightness(.88);transition:transform .5s ease,filter .5s ease}
.pb-thumb:hover img{transform:scale(1.08);filter:none}
.pb-thumb-a{left:-12px}
.pb-thumb-b{left:calc(31% + 12px)}
.pb-num{position:absolute;top:-18px;left:-14px;z-index:3;font-family:var(--mono);font-size:64px;font-weight:800;line-height:1;color:transparent;-webkit-text-stroke:1px rgba(0,211,180,.65);text-shadow:0 8px 30px rgba(0,0,0,.6)}
.pb-kicker{margin:0 0 10px;font-family:var(--mono);font-size:11px;letter-spacing:.19em;color:var(--brand);font-weight:700}
.pb-body h3{margin:0 0 20px;font-size:clamp(26px,2.5vw,34px);line-height:1.35;font-weight:800;letter-spacing:-.015em}
.pb-body h3 span{display:block;margin-top:7px;font-size:15px;font-weight:500;color:var(--muted);letter-spacing:0}
.pb-body>p{color:var(--text-2);font-size:15.5px;line-height:2;margin:0 0 22px}
.pb-body>p strong{color:var(--text);font-weight:700}
.check-list{display:grid;gap:11px;margin:0 0 6px}
.check-list li{position:relative;padding-left:28px;color:var(--text-2);font-size:14.5px;line-height:1.8}
.check-list li::before{content:"";position:absolute;left:2px;top:9px;width:14px;height:14px;border-radius:4px;background:rgba(0,211,180,.14);border:1px solid rgba(0,211,180,.55);box-shadow:inset 0 0 0 3px rgba(0,211,180,.1)}
.check-list li::after{content:"";position:absolute;left:6px;top:12px;width:6px;height:3px;border-left:1.6px solid var(--brand);border-bottom:1.6px solid var(--brand);transform:rotate(-45deg)}
.check-list li strong{color:var(--brand);font-weight:700}
.highlight-box{margin:0 0 24px;padding:22px 24px;border:1px solid rgba(0,211,180,.28);border-radius:var(--r);background:linear-gradient(135deg,rgba(0,211,180,.09),rgba(18,183,245,.03) 60%,transparent)}
.highlight-box h4{margin:0 0 16px;font-size:15px;color:var(--brand);display:flex;align-items:center;gap:9px}
.benefit-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px 22px}
.benefit-grid li{display:flex;flex-direction:column;gap:2px}
.benefit-grid b{font-size:14px;color:var(--text)}
.benefit-grid span{font-size:12.5px;color:var(--muted);line-height:1.7}
.scene-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 24px}
.scene-card{display:flex;flex-direction:column;align-items:center;gap:2px;padding:16px 8px;border:1px solid var(--line);border-radius:var(--r-s);background:rgba(255,255,255,.025);text-align:center;transition:border-color .25s ease,transform .25s ease}
.scene-card:hover{border-color:rgba(0,211,180,.5);transform:translateY(-3px)}
.scene-icon{font-size:22px;color:var(--brand);line-height:1.2}
.scene-card b{font-size:14px}
.scene-card small{font-size:11.5px;color:var(--muted)}
.gas-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin:0 0 24px}
.gas-card{display:flex;flex-direction:column;align-items:center;padding:15px 8px;border:1px solid var(--line);border-radius:var(--r-s);background:linear-gradient(160deg,rgba(23,40,59,.8),rgba(10,18,30,.6))}
.gas-card b{font-family:var(--mono);font-size:22px;color:var(--brand);letter-spacing:.02em}
.gas-card span{font-size:12.5px;color:var(--muted)}
.region-box{margin:0 0 22px;padding:18px 20px;border:1px dashed rgba(0,211,180,.35);border-radius:var(--r);background:rgba(0,211,180,.04)}
.region-title{margin:0 0 4px!important;font-size:13px!important;color:var(--brand)!important;font-weight:700}
.region-chips{margin-top:14px}

/* 产品分类选项卡 */
.tabs{margin:0 0 8px;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:rgba(9,17,28,.6)}
.tab-list{display:flex;overflow-x:auto;scrollbar-width:thin;border-bottom:1px solid var(--line);background:rgba(255,255,255,.02)}
.tab-btn{flex:1;min-width:max-content;padding:12px 14px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);font-size:13.5px;font-weight:700;white-space:nowrap;transition:color .2s ease,background .2s ease,border-color .2s ease}
.tab-btn:hover{color:var(--text);background:rgba(255,255,255,.03)}
.tab-btn.active{color:var(--brand);border-bottom-color:var(--brand);background:rgba(0,211,180,.07)}
.tab-panels{padding:20px 22px 22px;min-height:168px}
.tab-panel{display:none;animation:tabIn .35s ease}
.tab-panel.active{display:block}
@keyframes tabIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.tab-desc{margin:0 0 14px;font-size:13px;color:var(--muted)}
.formula-row{display:flex;flex-wrap:wrap;gap:8px}
.formula-row span{display:inline-flex;align-items:baseline;gap:7px;padding:6px 11px;border:1px solid var(--line);border-radius:6px;font-size:12.5px;color:var(--text-2);background:rgba(255,255,255,.025)}
.formula-row i{font-family:var(--mono);font-style:normal;font-size:11.5px;color:var(--brand)}

/* ---------- 供气模式 ---------- */
.mode-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.mode-card{border:1px solid var(--line);border-radius:var(--r-l);overflow:hidden;background:linear-gradient(170deg,var(--panel),var(--bg-2));box-shadow:var(--shadow);transition:transform .3s ease,border-color .3s ease}
.mode-card:hover{transform:translateY(-6px);border-color:rgba(0,211,180,.45)}
.mode-img{aspect-ratio:4/3;overflow:hidden;background:var(--panel-2)}
.mode-img img{width:100%;height:100%;object-fit:cover;filter:saturate(.86) brightness(.9);transition:transform .6s ease,filter .4s ease}
.mode-card:hover .mode-img img{transform:scale(1.06);filter:none}
.mode-content{padding:22px 22px 26px}
.mode-tag{display:inline-block;font-family:var(--mono);font-size:10px;letter-spacing:.15em;color:var(--brand);border:1px solid rgba(0,211,180,.4);border-radius:4px;padding:2px 8px;margin-bottom:12px}
.mode-content h3{margin:0 0 10px;font-size:19px;font-weight:800}
.mode-content p{margin:0;font-size:13.8px;line-height:1.9;color:var(--text-2)}
.mode-content p strong{color:var(--brand)}
.compare-wrap{margin-top:64px;border:1px solid var(--line);border-radius:var(--r-l);background:rgba(9,17,28,.6);overflow:hidden}
.compare-title{margin:0;padding:24px 28px 0;font-size:20px}
.table-scroll{overflow-x:auto;padding:18px 28px 28px}
.compare-table{width:100%;border-collapse:collapse;min-width:760px;font-size:13.5px}
.compare-table th,.compare-table td{text-align:left;padding:14px 16px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.75}
.compare-table th{color:var(--brand);font-weight:700;font-size:12.5px;letter-spacing:.05em;background:rgba(0,211,180,.05);white-space:nowrap}
.compare-table td{color:var(--text-2)}
.compare-table tbody tr:last-child td{border-bottom:0}
.compare-table tbody tr:hover td{background:rgba(255,255,255,.02)}
.compare-table td b{color:var(--text)}

/* ---------- 物流配送 ---------- */
.logistics-hero{position:relative;border-radius:var(--r-l);overflow:hidden;border:1px solid var(--line-strong);aspect-ratio:2.55/1;min-height:300px;box-shadow:var(--shadow)}
.logistics-hero>img{width:100%;height:100%;object-fit:cover;filter:saturate(.85) contrast(1.05) brightness(.72)}
.logistics-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(6,12,21,.92),rgba(6,12,21,.45) 48%,rgba(6,12,21,.1)),linear-gradient(0deg,rgba(6,12,21,.6),transparent 50%)}
.logistics-overlay{position:absolute;left:48px;top:50%;transform:translateY(-50%);z-index:2;max-width:480px}
.logistics-badge{display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;color:var(--brand);border:1px solid rgba(0,211,180,.45);padding:4px 10px;border-radius:4px;margin-bottom:16px}
.logistics-overlay h3{margin:0 0 10px;font-size:clamp(24px,2.8vw,38px);line-height:1.35;font-weight:800}
.logistics-overlay p{margin:0;color:var(--text-2);font-size:14px;letter-spacing:.1em}
.logistics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:24px}
.log-card{padding:26px 24px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(160deg,rgba(23,40,59,.7),rgba(10,18,30,.5))}
.log-icon{display:block;font-size:26px;color:var(--brand);margin-bottom:12px}
.log-card h4{margin:0 0 9px;font-size:17px}
.log-card p{margin:0;font-size:13.8px;color:var(--text-2);line-height:1.9}
.network-panel{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-top:64px;padding:38px 40px;border:1px solid var(--line);border-radius:var(--r-l);background:radial-gradient(circle at 80% 50%,rgba(0,211,180,.08),transparent 55%),rgba(9,17,28,.6)}
.network-copy h3{margin:0 0 14px;font-size:26px;font-weight:800}
.network-copy p{color:var(--text-2);font-size:14.5px;line-height:1.95}
.network-visual svg{width:100%;height:auto;display:block;filter:drop-shadow(0 0 18px rgba(0,211,180,.18))}
.log-photos{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:24px}
.log-photos figure{margin:0;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;background:var(--panel)}
.log-photos img{width:100%;aspect-ratio:16/10;object-fit:cover;filter:saturate(.82) contrast(1.05) brightness(.86);transition:transform .6s ease,filter .4s ease}
.log-photos figure:hover img{transform:scale(1.06);filter:none}
.log-photos figcaption{padding:12px 16px;font-size:13px;color:var(--text-2);border-top:1px solid var(--line)}

/* ---------- 图集 ---------- */
.gallery-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.gallery-item{position:relative;padding:0;border:1px solid var(--line);border-radius:var(--r-s);overflow:hidden;background:var(--panel);aspect-ratio:4/3;text-align:left}
.gallery-item img{width:100%;height:100%;object-fit:cover;filter:saturate(.8) contrast(1.06) brightness(.84);transition:transform .55s ease,filter .45s ease}
.gallery-item:hover img{transform:scale(1.09);filter:none}
.gallery-item::after{content:"";position:absolute;inset:0;background:linear-gradient(0deg,rgba(5,11,20,.78),transparent 48%);pointer-events:none}
.gallery-item span{position:absolute;left:14px;bottom:11px;z-index:2;font-size:12.5px;color:#eaf4ff;font-weight:600;letter-spacing:.03em}
.gallery-item:hover{border-color:rgba(0,211,180,.5)}

/* ---------- 关于我们 ---------- */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.about-copy h2{margin:0 0 22px;font-size:clamp(30px,3.2vw,42px);line-height:1.35;font-weight:800;letter-spacing:-.02em}
.about-copy p{color:var(--text-2);font-size:15.5px;line-height:2;margin:0 0 18px}
.about-copy p strong{color:var(--text)}
.about-copy .btn{margin-top:12px}
.about-cards{display:grid;gap:14px}
.about-card{display:flex;gap:20px;padding:22px 24px;border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(120deg,rgba(23,40,59,.75),rgba(10,18,30,.45));transition:border-color .25s ease,transform .25s ease}
.about-card:hover{border-color:rgba(0,211,180,.42);transform:translateX(4px)}
.ac-num{font-family:var(--mono);font-size:24px;font-weight:800;color:transparent;-webkit-text-stroke:1px rgba(0,211,180,.6);line-height:1.3}
.about-card h3{margin:0 0 6px;font-size:17px}
.about-card p{margin:0;font-size:13.5px;color:var(--text-2);line-height:1.85}

/* ---------- 联系我们 ---------- */
.contact-section{position:relative;overflow:hidden;border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(13,24,38,.9),var(--bg))}
.contact-glow{position:absolute;width:700px;height:700px;left:50%;top:-320px;transform:translateX(-50%);background:radial-gradient(circle,rgba(0,211,180,.13),transparent 65%);pointer-events:none}
.contact-grid{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:start}
.contact-info{display:grid;gap:16px}
.contact-big{position:relative;display:flex;flex-direction:column;gap:5px;padding:26px 30px;border:1px solid var(--line-strong);border-radius:var(--r-l);background:linear-gradient(130deg,rgba(23,40,59,.9),rgba(10,18,30,.7));overflow:hidden;transition:border-color .25s ease,transform .25s ease}
.contact-big::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;background:var(--grad-brand)}
.contact-big:hover{border-color:rgba(0,211,180,.6);transform:translateY(-3px)}
.ci-label{font-size:12.5px;color:var(--muted);letter-spacing:.1em}
.contact-big strong{font-family:var(--mono);font-size:clamp(22px,2.4vw,32px);letter-spacing:-.01em;color:var(--text)}
.ci-arrow{position:absolute;right:26px;top:50%;transform:translateY(-50%);font-size:22px;color:var(--brand)}
.contact-note{padding:22px 26px;border:1px dashed var(--line-strong);border-radius:var(--r);color:var(--text-2);font-size:13.5px}
.contact-note p{margin:0 0 8px;line-height:1.9}
.contact-note p:last-child{margin-bottom:0}
.contact-note b{display:inline-block;min-width:78px;color:var(--muted);font-weight:500}
.contact-form{padding:30px;border:1px solid var(--line);border-radius:var(--r-l);background:linear-gradient(160deg,rgba(19,34,51,.9),rgba(9,17,28,.85));box-shadow:var(--shadow)}
.contact-form h3{margin:0 0 6px;font-size:22px}
.form-hint{margin:0 0 22px;font-size:12.5px;color:var(--muted);line-height:1.8}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.contact-form label{display:flex;flex-direction:column;gap:7px;margin-bottom:16px;font-size:13px;color:var(--text-2);font-weight:600}
.contact-form label span{color:var(--flame)}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:11px 13px;border:1px solid var(--line-strong);border-radius:8px;background:rgba(5,11,20,.65);color:var(--text);font-size:14px;transition:border-color .2s ease,box-shadow .2s ease}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:#6c8198}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(0,211,180,.12)}
.contact-form textarea{resize:vertical;min-height:96px}
.contact-form select option{background:#0d1826}
.form-status{margin:14px 0 0;font-size:13px;color:var(--brand);min-height:20px}

/* ---------- 页脚 ---------- */
.site-footer{border-top:1px solid var(--line);background:#050a12;padding:64px 0 26px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.2fr 1fr;gap:44px}
.footer-logo{margin-bottom:18px}
.footer-brand p{margin:0;color:var(--muted);font-size:13px;line-height:1.9}
.footer-col{display:flex;flex-direction:column;gap:9px}
.footer-col h4{margin:0 0 8px;font-size:14px;color:var(--text)}
.footer-col a{font-size:13px;color:var(--muted);transition:color .2s ease,transform .2s ease}
.footer-col a:hover{color:var(--brand);transform:translateX(3px)}
.footer-small{font-size:12.5px;color:var(--muted);margin:6px 0 0}
.footer-bottom{margin-top:52px;padding-top:22px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px;color:var(--muted);font-size:12.5px}
.footer-bottom p{margin:0}
.credits{color:var(--muted);font-size:12.5px}
.credits summary{cursor:pointer;width:max-content;color:var(--text-2);transition:color .2s ease}
.credits summary:hover{color:var(--brand)}
.credits-body{max-width:950px;margin-top:12px;padding:16px 20px;border:1px solid var(--line);border-radius:var(--r-s);background:rgba(255,255,255,.02);line-height:1.9}
.credits-body p{margin:0 0 8px}
.credits-body p:last-child{margin-bottom:0}
.credits-links a{color:var(--brand);text-decoration:underline;text-underline-offset:2px}

/* ---------- 灯箱 / 返回顶部 ---------- */
.lightbox{position:fixed;inset:0;z-index:300;background:rgba(3,7,13,.94);backdrop-filter:blur(10px);display:flex;align-items:center;justify-content:center;padding:60px 70px 76px}
.lightbox[hidden]{display:none}
.lightbox img{max-width:100%;max-height:100%;object-fit:contain;border:1px solid var(--line-strong);border-radius:8px;box-shadow:0 30px 80px rgba(0,0,0,.8)}
.lb-close,.lb-prev,.lb-next{position:absolute;border:1px solid var(--line-strong);background:rgba(20,36,54,.8);color:var(--text);border-radius:50%;width:44px;height:44px;font-size:26px;line-height:1;display:grid;place-items:center;transition:background .2s ease,border-color .2s ease}
.lb-close:hover,.lb-prev:hover,.lb-next:hover{background:rgba(0,211,180,.16);border-color:var(--brand)}
.lb-close{right:26px;top:24px}
.lb-prev{left:22px;top:50%;transform:translateY(-50%)}
.lb-next{right:22px;top:50%;transform:translateY(-50%)}
.lb-cap{position:absolute;bottom:24px;left:0;right:0;text-align:center;margin:0;color:var(--text-2);font-size:14px}
.to-top{position:fixed;right:24px;bottom:24px;z-index:90;width:46px;height:46px;border-radius:50%;border:1px solid rgba(0,211,180,.5);background:rgba(9,20,32,.9);color:var(--brand);font-size:20px;box-shadow:var(--glow);transition:transform .25s ease,background .25s ease}
.to-top:hover{transform:translateY(-4px);background:rgba(0,211,180,.16)}
.to-top[hidden]{display:none}

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

/* ---------- 响应式 ---------- */
@media (max-width:1100px){
  .hero-inner{grid-template-columns:1fr .85fr;gap:34px}
  .product-block{gap:38px}
  .section-head{gap:26px}
  .mode-grid{grid-template-columns:repeat(2,1fr)}
  .gallery-grid{grid-template-columns:repeat(3,1fr)}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr;gap:30px}
  .footer-col:last-child{grid-column:1/-1;flex-direction:row;flex-wrap:wrap;align-items:center;gap:18px}
  .footer-col:last-child h4{width:100%;margin:0}
}
@media (max-width:900px){
  :root{--header-h:66px}
  .section{padding:78px 0}
  .nav-toggle{display:flex}
  .main-nav{position:absolute;top:var(--header-h);left:0;right:0;flex-direction:column;align-items:stretch;gap:2px;padding:14px 24px 22px;background:rgba(7,13,22,.98);border-bottom:1px solid var(--line-strong);box-shadow:0 24px 40px rgba(0,0,0,.6);transform:translateY(-12px);opacity:0;pointer-events:none;transition:opacity .25s ease,transform .25s ease}
  .main-nav.open{opacity:1;transform:none;pointer-events:auto}
  .nav-link{padding:12px 8px;font-size:15px;border-radius:6px}
  .nav-link::after{left:8px;right:auto;width:24px}
  .nav-cta{margin:8px 0 0;text-align:center}
  .hero{min-height:auto;padding:calc(var(--header-h) + 60px) 0 80px}
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-stats{max-width:560px}
  .hero-veil{background:linear-gradient(90deg,rgba(6,11,20,.95),rgba(6,11,20,.7)),linear-gradient(0deg,var(--bg),transparent 35%)}
  .section-head{grid-template-columns:1fr;gap:16px;margin-bottom:44px}
  .product-block,.product-block.reverse{grid-template-columns:1fr;gap:30px;padding:44px 0}
  .product-block.reverse .pb-media{order:0}
  .product-block.reverse .pb-body{order:0}
  .pb-media{padding-bottom:0}
  .pb-num{font-size:50px;top:-14px;left:0}
  .pb-thumb{position:static;width:calc(50% - 7px);aspect-ratio:4/3;border-width:2px;margin-top:12px;display:inline-block;vertical-align:top}
  .pb-thumb-a{margin-right:10px}
  .pb-media::after{content:"";display:block;clear:both}
  .pb-media{display:flex;flex-wrap:wrap}
  .pb-main-img{width:100%;flex:none}
  .pb-thumb-a{left:0}
  .pb-thumb-b{left:0}
  .network-panel,.about-grid,.contact-grid{grid-template-columns:1fr;gap:30px}
  .network-visual{max-width:520px;margin-inline:auto}
  .logistics-grid{grid-template-columns:1fr}
  .log-photos{grid-template-columns:repeat(2,1fr)}
  .logistics-hero{aspect-ratio:16/9}
  .compare-wrap{margin-top:44px}
}
@media (max-width:640px){
  .container{width:min(100% - 32px,var(--maxw))}
  .section{padding:64px 0}
  .hero-copy h1{font-size:clamp(34px,9vw,46px)}
  .hero-lead{font-size:15px}
  .hero-actions .btn{width:100%}
  .hero-stats{gap:10px}
  .stat-card{padding:18px 16px}
  .stat-num{font-size:32px}
  .section-head h2{font-size:28px}
  .section-lead{font-size:14.5px}
  .product-block{padding:36px 0}
  .pb-body h3{font-size:25px}
  .pb-body>p{font-size:14.5px}
  .benefit-grid,.scene-grid,.gas-grid{grid-template-columns:repeat(2,1fr)}
  .scene-grid{gap:8px}
  .mode-grid{grid-template-columns:1fr}
  .mode-img{aspect-ratio:16/9}
  .gallery-grid{grid-template-columns:repeat(2,1fr);gap:10px}
  .log-photos{grid-template-columns:1fr}
  .logistics-hero{aspect-ratio:4/3;min-height:260px}
  .logistics-overlay{left:24px;right:24px}
  .network-panel{padding:26px 22px}
  .network-copy h3{font-size:22px}
  .form-row{grid-template-columns:1fr}
  .contact-form{padding:22px}
  .contact-big strong{font-size:24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
  .footer-col:last-child{grid-column:1/-1}
  .footer-bottom{margin-top:36px}
  .lightbox{padding:70px 14px 76px}
  .lb-prev{left:8px}.lb-next{right:8px}.lb-close{right:12px;top:12px}
  .to-top{right:14px;bottom:14px}
  .scroll-hint{display:none}
}
@media (max-width:400px){
  .benefit-grid{grid-template-columns:1fr}
  .hero-stats{grid-template-columns:1fr 1fr}
  .stat-wide{grid-column:1/-1}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;transition-duration:.01ms!important}
  .reveal{opacity:1;transform:none}
}
@media print{
  .site-header,.to-top,.scroll-hint,.hero-media,.lightbox{display:none!important}
  body{background:#fff;color:#111}
  .reveal{opacity:1;transform:none}
}