/* ============ 金焰生物质颗粒厂 · 现代工业风 ============ */
:root{
  --steel-9:#0e1116;
  --steel-7:#1a1f27;
  --steel-5:#242b36;
  --line:#2e3743;
  --paper:#f4f5f7;
  --paper-2:#e9ebee;
  --ink:#171b21;
  --ink-2:#5a6472;
  --fire:#ff6a13;
  --fire-2:#ff8a3d;
  --fire-deep:#d94f04;
  --mono:'Consolas','JetBrains Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Microsoft YaHei','PingFang SC',sans-serif;color:var(--ink);background:var(--paper);line-height:1.7}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{width:min(1200px,92%);margin:0 auto}

/* 顶栏 */
.topbar{background:var(--steel-9);color:#9aa5b1;font-size:13px}
.topbar-in{display:flex;justify-content:space-between;padding:8px 0}
.topbar a{color:var(--fire-2)}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--paper-2)}
.nav-in{display:flex;align-items:center;gap:28px;padding:14px 0}
.logo{display:flex;align-items:center;gap:12px}
.logo-mark{background:linear-gradient(135deg,var(--fire),var(--fire-deep));color:#fff;font-weight:800;font-size:22px;padding:6px 12px;letter-spacing:2px;clip-path:polygon(0 0,100% 0,100% 72%,88% 100%,0 100%)}
.logo-text{font-weight:700;font-size:16px;line-height:1.25}
.logo-text small{display:block;font-size:10px;color:var(--ink-2);letter-spacing:2px;font-family:var(--mono);font-weight:400}
.menu{display:flex;gap:24px;margin-left:auto;font-size:15px;font-weight:600}
.menu a{padding:6px 2px;border-bottom:3px solid transparent;transition:.2s}
.menu a:hover{color:var(--fire);border-color:var(--fire)}
.nav-phone{background:var(--steel-9);color:#fff;padding:9px 16px;font-weight:700;font-size:14px;white-space:nowrap}

/* 首屏 */
.hero{position:relative;min-height:640px;display:flex;align-items:center;overflow:hidden;color:#fff}
.hero-img{position:absolute;inset:0}
.hero-img img{width:100%;height:100%;object-fit:cover}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(100deg,rgba(10,13,18,.88) 0%,rgba(10,13,18,.62) 46%,rgba(10,13,18,.15) 100%)}
.hero-in{position:relative;padding:90px 0 60px}
.hero-tag{font-family:var(--mono);letter-spacing:4px;font-size:12px;color:var(--fire-2);margin-bottom:18px}
.hero h1{font-size:clamp(34px,5vw,60px);line-height:1.18;letter-spacing:1px}
.hero-sub{margin:20px 0 30px;color:#cfd6de;font-size:17px;max-width:640px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-block;padding:13px 28px;font-weight:700;font-size:15px;transition:.2s}
.btn-fire{background:linear-gradient(135deg,var(--fire),var(--fire-deep));color:#fff;box-shadow:0 8px 22px rgba(255,106,19,.35)}
.btn-fire:hover{transform:translateY(-2px)}
.btn-ghost{border:1px solid rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.hero-stats{display:flex;gap:0;margin-top:56px;list-style:none;flex-wrap:wrap}
.hero-stats li{padding:0 34px;border-left:1px solid rgba(255,255,255,.25)}
.hero-stats li:first-child{padding-left:0;border:none}
.hero-stats b{display:block;font-size:32px;color:var(--fire-2);font-family:var(--mono)}
.hero-stats span{font-size:13px;color:#b8c1cb}

/* 跑马灯 */
.ticker{background:var(--fire);color:#fff;overflow:hidden;white-space:nowrap;padding:12px 0;font-weight:700;letter-spacing:2px}
.ticker-track{display:inline-block;animation:tk 26s linear infinite}
@keyframes tk{to{transform:translateX(-50%)}}

/* 通用段落 */
.sec{padding:96px 0}
.sec-dark{background:var(--steel-7);color:#e7ebef}
.sec-eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:3px;color:var(--fire);margin-bottom:10px}
.sec-eyebrow.light{color:var(--fire-2)}
.sec-head{max-width:720px;margin:0 auto 56px;text-align:center}
.sec-head.left{text-align:left;margin:0 0 32px}
.sec-head h2{font-size:clamp(26px,3.4vw,38px);letter-spacing:1px}
.sec-head .h3-line{font-size:26px}
.sec-desc{margin-top:14px;color:var(--ink-2)}
.sec-desc.light{color:#a8b2bd}

/* 颗粒 */
.pellet-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.pellet-card{background:#fff;border:1px solid var(--paper-2);transition:.25s;position:relative}
.pellet-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(20,26,34,.14)}
.pellet-card img{height:230px;width:100%;object-fit:cover}
.pellet-info{padding:20px 20px 24px;border-top:3px solid var(--fire)}
.pellet-info em{font-family:var(--mono);font-style:normal;font-size:12px;color:var(--fire);letter-spacing:2px}
.pellet-info h3{font-size:19px;margin:6px 0 8px}
.pellet-info p{font-size:13.5px;color:var(--ink-2)}

/* 设备 */
.equip-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.equip-card{background:var(--steel-5);border:1px solid var(--line);overflow:hidden;transition:.25s}
.equip-card:hover{border-color:var(--fire);transform:translateY(-6px)}
.equip-card img{height:210px;width:100%;object-fit:cover}
.equip-info{padding:18px 18px 24px}
.equip-info h3{font-size:17px;color:#fff;margin-bottom:8px;padding-left:12px;border-left:3px solid var(--fire)}
.equip-info p{font-size:13.5px;color:#a8b2bd}

/* 炉具大区块：交错排版 */
.stove-feature{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;padding:52px 0;border-top:1px dashed var(--paper-2)}
.stove-feature:first-of-type{border-top:none;padding-top:0}
.stove-feature-img{background:linear-gradient(160deg,var(--steel-7),var(--steel-5));padding:36px;display:flex;gap:18px;justify-content:center;align-items:flex-end;min-height:380px}
.stove-feature-img img{max-height:420px;width:auto;max-width:48%;object-fit:contain;filter:drop-shadow(0 14px 22px rgba(0,0,0,.35))}
.stove-feature-img.duo img{max-width:46%}
.stove-feature.rev .stove-feature-img{order:2}
.stove-feature-txt em{font-family:var(--mono);font-style:normal;font-size:12px;letter-spacing:3px;color:var(--fire)}
.stove-feature-txt h3{font-size:30px;margin:10px 0 18px}
.stove-feature-txt ul{list-style:none}
.stove-feature-txt li{padding:10px 0 10px 26px;position:relative;color:var(--ink-2);border-bottom:1px solid var(--paper-2)}
.stove-feature-txt li::before{content:'';position:absolute;left:2px;top:20px;width:10px;height:10px;background:linear-gradient(135deg,var(--fire),var(--fire-deep));clip-path:polygon(0 0,100% 50%,0 100%)}

/* 燃木壁炉 */
.bilu{margin-top:56px;padding-top:52px;border-top:1px dashed var(--paper-2)}
.bilu-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.bilu-card{background:#fff;border:1px solid var(--paper-2);padding-bottom:22px;transition:.25s}
.bilu-card:hover{transform:translateY(-6px);box-shadow:0 16px 36px rgba(20,26,34,.13)}
.bilu-card img{height:300px;width:100%;object-fit:contain;padding:22px;background:linear-gradient(160deg,var(--steel-7),var(--steel-5))}
.bilu-card h4{text-align:center;font-size:18px;margin:16px 0 6px}
.bilu-card p{text-align:center;font-size:13.5px;color:var(--ink-2);padding:0 22px}

/* 商标 */
.tm-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.tm-card{background:#fff;border:1px solid var(--line);overflow:hidden}
.tm-card img{height:420px;width:100%;object-fit:cover;object-position:top;transition:.3s}
.tm-card:hover img{transform:scale(1.03)}
.tm-card figcaption{padding:16px 18px;border-top:3px solid var(--fire);display:flex;justify-content:space-between;align-items:baseline;background:var(--steel-5)}
.tm-card b{color:#fff;font-size:17px;letter-spacing:2px}
.tm-card span{font-family:var(--mono);font-size:12px;color:#a8b2bd}

/* 优势 */
.why-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.why-item{background:#fff;border:1px solid var(--paper-2);padding:30px 24px;border-top:3px solid var(--steel-9);transition:.25s}
.why-item:hover{border-top-color:var(--fire)}
.why-item i{font-style:normal;font-size:30px}
.why-item h3{font-size:17px;margin:12px 0 8px}
.why-item p{font-size:13.5px;color:var(--ink-2)}

/* 联系 */
.contact{background:linear-gradient(120deg,var(--steel-9),var(--steel-7));color:#fff}
.contact-in{display:grid;grid-template-columns:1.4fr 1fr;gap:50px;align-items:center}
.contact .sec-desc{color:#a8b2bd}
.contact-box{background:rgba(255,255,255,.05);border:1px solid var(--line);padding:38px 34px;text-align:center}
.big-phone{display:block;font-family:var(--mono);font-size:clamp(28px,3.4vw,40px);font-weight:700;color:var(--fire-2);letter-spacing:2px;margin-bottom:12px}
.contact-box p{color:#a8b2bd;font-size:14px;margin-bottom:22px}

/* 页脚 */
.footer{background:var(--steel-9);color:#8a94a0;font-size:13.5px;text-align:center;padding:26px 0}
.footer a:hover{color:var(--fire-2)}
.footer-in p{margin:4px 0}

/* 响应式 */
@media(max-width:960px){
  .menu{display:none}
  .pellet-grid,.equip-grid,.why-grid{grid-template-columns:repeat(2,1fr)}
  .stove-feature{grid-template-columns:1fr;gap:26px}
  .stove-feature.rev .stove-feature-img{order:0}
  .bilu-grid,.tm-grid{grid-template-columns:1fr}
  .contact-in{grid-template-columns:1fr}
  .hero-stats li{padding:0 18px;margin-bottom:12px}
}
@media(max-width:560px){
  .pellet-grid,.equip-grid,.why-grid{grid-template-columns:1fr}
}

/* ============ 多页面扩展 ============ */
/* 内页横幅 */
.page-hero{position:relative;padding:110px 0 90px;color:#fff;background:linear-gradient(120deg,var(--steel-9),var(--steel-7));overflow:hidden}
.page-hero::after{content:'';position:absolute;right:-80px;top:-80px;width:360px;height:360px;border-radius:50%;background:radial-gradient(circle,rgba(255,106,19,.25),transparent 70%)}
.page-hero .wrap{position:relative;z-index:1}
.page-hero h1{font-size:clamp(30px,4.5vw,46px);letter-spacing:1px;margin-top:14px}
.page-hero .sec-eyebrow{color:var(--fire-2)}
.breadcrumb{display:inline-block;margin-top:18px;font-size:13px;color:#a8b2bd;letter-spacing:1px}
.breadcrumb a:hover{color:var(--fire-2)}
.breadcrumb b{color:var(--fire-2);font-weight:600}

/* 导航当前页高亮 */
.menu a.active{color:var(--fire);border-color:var(--fire)}

/* 内容页标题块 */
.block-head{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:34px;gap:20px;flex-wrap:wrap}
.block-head h2{font-size:clamp(22px,2.6vw,30px)}
.block-head .sec-eyebrow{margin-bottom:6px}
.block-head p{color:var(--ink-2);font-size:14px;max-width:520px}

/* 产品详情卡片（产品中心） */
.prod-card{background:#fff;border:1px solid var(--paper-2);overflow:hidden;transition:.25s}
.prod-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(20,26,34,.14)}
.prod-card .img-box{height:250px;background:linear-gradient(160deg,var(--steel-7),var(--steel-5));display:flex;align-items:center;justify-content:center;padding:20px}
.prod-card .img-box img{max-height:100%;max-width:100%;object-fit:contain;filter:drop-shadow(0 10px 18px rgba(0,0,0,.3))}
.prod-card .img-box.cover img{object-fit:cover;height:100%;width:100%;filter:none}
.prod-card .body{padding:20px 22px 24px;border-top:3px solid var(--fire)}
.prod-card .body h3{font-size:18px;margin-bottom:8px}
.prod-card .body .tag{font-family:var(--mono);font-size:11px;color:var(--fire);letter-spacing:2px}
.prod-card .body p{font-size:13.5px;color:var(--ink-2);margin-top:6px}
.prod-card ul{list-style:none;margin-top:12px}
.prod-card ul li{font-size:13.5px;color:var(--ink-2);padding:4px 0 4px 18px;position:relative}
.prod-card ul li::before{content:'';position:absolute;left:2px;top:12px;width:7px;height:7px;background:var(--fire);clip-path:polygon(0 0,100% 50%,0 100%)}

/* 分段间距 */
.mt-lg{margin-top:72px}
.mt-sm{margin-top:40px}

/* 关于我们 */
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:50px;align-items:center}
.about-grid img{width:100%;height:100%;object-fit:cover}
.about-txt h2{font-size:clamp(24px,3vw,34px);margin:8px 0 18px}
.about-txt p{color:var(--ink-2);margin-bottom:14px}
.about-facts{list-style:none;margin-top:18px}
.about-facts li{padding:10px 0 10px 26px;position:relative;color:var(--ink);border-bottom:1px solid var(--paper-2);font-size:15px}
.about-facts li::before{content:'';position:absolute;left:2px;top:20px;width:10px;height:10px;background:linear-gradient(135deg,var(--fire),var(--fire-deep));clip-path:polygon(0 0,100% 50%,0 100%)}

/* FAQ */
.faq-list{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--paper-2);margin-bottom:16px;overflow:hidden}
.faq-q{display:flex;justify-content:space-between;align-items:center;padding:20px 24px;font-weight:700;font-size:16px;cursor:pointer;gap:16px}
.faq-q span{color:var(--fire);font-family:var(--mono);margin-right:6px}
.faq-item details[open] .faq-q{color:var(--fire)}
.faq-a{padding:0 24px 22px;color:var(--ink-2);font-size:14.5px;border-top:1px dashed var(--paper-2);padding-top:16px;margin:0 24px}

/* 联系页 */
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.ccard{background:#fff;border:1px solid var(--paper-2);padding:30px 24px;text-align:center;border-top:3px solid var(--fire)}
.ccard i{font-style:normal;font-size:32px}
.ccard h3{font-size:17px;margin:12px 0 8px}
.ccard p{color:var(--ink-2);font-size:14px}
.ccard a{color:var(--fire);font-weight:700;font-size:17px;font-family:var(--mono)}
.map-box{margin-top:40px;border:1px solid var(--paper-2);height:320px;background:var(--steel-7);display:flex;align-items:center;justify-content:center;color:#a8b2bd;font-size:15px;letter-spacing:2px}

@media(max-width:960px){
  .about-grid{grid-template-columns:1fr}
  .contact-cards{grid-template-columns:1fr}
}