/* ========================================
   泊头市财鑫金属材料有限公司 - 企业官网样式
   金色 + 深炭灰/石墨灰 主色调
   ======================================== */

/* Reset & Base */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
    --gold:#C9A76B;--gold-dark:#A6843C;--gold-light:#D4C08A;
    --charcoal:#2D2D2D;--charcoal-dark:#1A1A1A;
    --gray-bg:#F3F3F3;--text-dark:#333;--text-light:#E0E0E0;
    --text-muted:#999;--white:#FFF;--gold-glow:rgba(201,167,107,.3);
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:"Microsoft YaHei","PingFang SC","Helvetica Neue",Arial,sans-serif;color:var(--text-dark);line-height:1.7;overflow-x:hidden;background:var(--white)}
a{text-decoration:none;color:inherit}ul{list-style:none}img{max-width:100%;height:auto;display:block}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:100px 0}
.section-title{text-align:center;margin-bottom:60px}
.section-title h2{font-size:2.4rem;font-weight:700;color:var(--charcoal-dark);margin-bottom:16px;letter-spacing:2px}
.section-title .divider{width:60px;height:3px;background:var(--gold);margin:0 auto 16px;position:relative}
.section-title .divider::after{content:'';position:absolute;left:50%;transform:translateX(-50%);top:-3px;width:20px;height:9px;background:var(--gold);border-radius:2px}
.section-title p{color:var(--text-muted);font-size:1rem;letter-spacing:1px}
.fade-up{opacity:0;transform:translateY(40px);transition:opacity .8s ease,transform .8s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* Navbar */
.navbar{position:fixed;top:0;left:0;width:100%;z-index:1000;padding:18px 0;transition:all .4s ease;background:transparent}
.navbar.scrolled{background:rgba(26,26,26,.96);backdrop-filter:blur(10px);padding:12px 0;box-shadow:0 2px 20px rgba(0,0,0,.4)}
.navbar .container{display:flex;align-items:center;justify-content:space-between}
.navbar .logo{display:flex;align-items:center;gap:12px}
.navbar .logo-icon{width:40px;height:40px;background:var(--gold);border-radius:6px;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:1.2rem;color:var(--charcoal-dark);flex-shrink:0}
.navbar .logo-text{color:var(--white);font-size:1.05rem;font-weight:700;letter-spacing:1px;white-space:nowrap}
.nav-links{display:flex;gap:36px}
.nav-links a{color:var(--text-light);font-size:.95rem;font-weight:500;letter-spacing:1px;position:relative;padding:4px 0;transition:color .3s}
.nav-links a::after{content:'';position:absolute;bottom:-2px;left:0;width:0;height:2px;background:var(--gold);transition:width .3s ease}
.nav-links a:hover{color:var(--gold)}.nav-links a:hover::after{width:100%}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;z-index:1001}
.hamburger span{width:28px;height:2px;background:var(--white);transition:all .3s ease}
.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.active span:nth-child(2){opacity:0}
.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* Hero - 真实钢材图片背景 */
.hero{
    position:relative;min-height:100vh;display:flex;
    align-items:center;justify-content:center;text-align:center;
    overflow:hidden;
    background:url('../images/hero-steel.jpg') center/cover no-repeat;
    background-color:#0d0d0d;
}
.hero::before{
    content:'';position:absolute;inset:0;z-index:0;
    background:linear-gradient(180deg,
        rgba(13,13,13,.82) 0%,
        rgba(13,13,13,.5) 35%,
        rgba(13,13,13,.4) 65%,
        rgba(13,13,13,.78) 100%
    );
}
.hero .gold-line{position:absolute;left:0;width:100%;height:3px;z-index:2;background:linear-gradient(90deg,transparent,var(--gold) 20%,var(--gold-light) 50%,var(--gold) 80%,transparent);opacity:.7}
.hero .gold-line.top{top:0}.hero .gold-line.bottom{bottom:0}
.hero-content{position:relative;z-index:1;padding:0 24px}
.hero-content .badge{display:inline-block;border:1px solid var(--gold);color:var(--gold);padding:8px 24px;font-size:.85rem;letter-spacing:4px;margin-bottom:32px;border-radius:2px;animation:badgePulse 3s ease-in-out infinite}
@keyframes badgePulse{0%,100%{box-shadow:0 0 0 rgba(201,167,107,0)}50%{box-shadow:0 0 20px rgba(201,167,107,.15)}}
.hero-content h1{font-size:3.2rem;font-weight:900;color:var(--white);letter-spacing:3px;margin-bottom:20px;line-height:1.3;text-shadow:0 2px 30px rgba(0,0,0,.6)}
.hero-content h1 .gold{color:var(--gold);text-shadow:0 0 40px rgba(201,167,107,.4)}
.hero-content .subtitle{font-size:1.2rem;color:#bbb;letter-spacing:2px;margin-bottom:48px}
.hero-content .cta-btn{display:inline-block;background:linear-gradient(135deg,var(--gold),var(--gold-dark));color:#1a1a1a;padding:16px 48px;font-size:1rem;font-weight:700;letter-spacing:2px;border-radius:2px;transition:all .3s ease;cursor:pointer;border:2px solid transparent}
.hero-content .cta-btn:hover{background:transparent;color:var(--gold);border-color:var(--gold);box-shadow:0 0 40px var(--gold-glow)}
.scroll-indicator{position:absolute;bottom:40px;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;color:var(--text-muted);font-size:.75rem;letter-spacing:2px;animation:bounce 2s infinite}
@keyframes bounce{0%,20%,50%,80%,100%{transform:translateX(-50%) translateY(0)}40%{transform:translateX(-50%) translateY(-10px)}60%{transform:translateX(-50%) translateY(-5px)}}
.scroll-indicator .arrow{width:20px;height:20px;border-right:2px solid var(--gold);border-bottom:2px solid var(--gold);transform:rotate(45deg)}

/* About - 工厂实景背景 + 旋转钢卷 */
.about{
    position:relative;overflow:hidden;
    background:url('../images/factory-2.jpg') center/cover no-repeat;
    background-attachment:fixed;
    background-color:#2a2a2a;
}
.about::before{
    content:'';position:absolute;inset:0;z-index:0;
    background:rgba(20,20,20,.78);
}
/* 底部金色分隔条 */
.about::after{
    content:'';position:absolute;bottom:0;left:0;width:100%;height:3px;z-index:2;
    background:linear-gradient(90deg,transparent,var(--gold) 30%,var(--gold-light) 50%,var(--gold) 70%,transparent);
    opacity:.8;
}
.about .container{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center;position:relative;z-index:1}
.about-text h3{font-size:1.8rem;font-weight:700;color:var(--white);margin-bottom:24px;letter-spacing:1px}
.about-text h3 .gold{color:var(--gold)}
.about-text p{color:#ccc;font-size:1.05rem;line-height:2;margin-bottom:16px}
.about-visual{display:flex;justify-content:center;align-items:center}
.about-coil{width:380px;height:380px;position:relative;display:flex;align-items:center;justify-content:center}
.about-coil .ring{position:absolute;border-radius:50%;border:3px solid transparent;animation:coilRotate 20s linear infinite}
.about-coil .ring:nth-child(1){width:340px;height:340px;border-top-color:rgba(201,167,107,.6);border-right-color:rgba(201,167,107,.3);animation-duration:20s}
.about-coil .ring:nth-child(2){width:280px;height:280px;border-top-color:rgba(166,132,60,.5);border-left-color:rgba(166,132,60,.3);animation-direction:reverse;animation-duration:16s}
.about-coil .ring:nth-child(3){width:220px;height:220px;border-bottom-color:rgba(201,167,107,.5);border-right-color:rgba(201,167,107,.25);animation-duration:13s}
.about-coil .ring:nth-child(4){width:160px;height:160px;border-top-color:rgba(166,132,60,.4);border-left-color:rgba(166,132,60,.2);animation-direction:reverse;animation-duration:10s}
.about-coil .ring:nth-child(5){width:100px;height:100px;border-bottom-color:rgba(201,167,107,.4);border-right-color:rgba(201,167,107,.2);animation-duration:7s}
.about-coil .center-dot{width:50px;height:50px;background:linear-gradient(135deg,var(--gold),var(--gold-dark));border-radius:50%;z-index:1;animation:centerGlow 3s ease-in-out infinite;box-shadow:0 0 30px rgba(201,167,107,.5),0 0 60px rgba(201,167,107,.2)}
@keyframes coilRotate{0%{transform:rotate(0deg)}100%{transform:rotate(360deg)}}
@keyframes centerGlow{0%,100%{box-shadow:0 0 30px rgba(201,167,107,.5),0 0 60px rgba(201,167,107,.2)}50%{box-shadow:0 0 50px rgba(201,167,107,.8),0 0 100px rgba(201,167,107,.4)}}
.about-coil .coil-label{position:absolute;z-index:2;text-align:center;background:rgba(255,255,255,.92);padding:16px 24px;border-radius:8px;box-shadow:0 4px 20px rgba(0,0,0,.1)}
.about-coil .coil-label .num{font-size:3rem;font-weight:900;color:var(--gold);line-height:1}
.about-coil .coil-label .lbl{font-size:.85rem;color:#999;letter-spacing:1px}
.about-features{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:16px}
.about-feature{display:flex;align-items:center;gap:10px;font-size:.95rem;color:#ccc}
.about-feature .dot{width:8px;height:8px;background:var(--gold);border-radius:50%;flex-shrink:0}

/* Products - 工厂实景背景 + 产品卡片 */
.products{
    position:relative;overflow:hidden;
    background:url('../images/factory-3.jpg') center/cover no-repeat;
    background-attachment:fixed;
    background-color:#1a1a1a;
}
.products::before{
    content:'';position:absolute;inset:0;z-index:0;
    background:rgba(15,15,15,.82);
}
/* 底部金色分隔条 */
.products::after{
    content:'';position:absolute;bottom:0;left:0;width:100%;height:3px;z-index:2;
    background:linear-gradient(90deg,transparent,var(--gold) 30%,var(--gold-light) 50%,var(--gold) 70%,transparent);
    opacity:.8;
}
.products-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;position:relative;z-index:1}
.product-card{background:var(--white);padding:40px 30px;text-align:center;border-radius:6px;transition:all .4s ease;position:relative;border:1px solid #e5e5e5;overflow:hidden;cursor:default}
.product-card::after{content:'';position:absolute;top:-50%;left:-100%;width:60%;height:200%;background:linear-gradient(90deg,transparent,rgba(201,167,107,.08),transparent);transform:skewX(-20deg);animation:cardShine 4s ease-in-out infinite;pointer-events:none}
@keyframes cardShine{0%{left:-100%}40%{left:150%}100%{left:150%}}
.product-card:hover{transform:translateY(-8px);box-shadow:0 20px 60px rgba(0,0,0,.15);border-color:rgba(201,167,107,.5)}
.product-card:hover::after{animation:none;left:150%}
.product-card .icon-wrap{width:72px;height:72px;margin:0 auto 20px;background:linear-gradient(135deg,rgba(201,167,107,.08),rgba(201,167,107,.02));border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s ease;position:relative;z-index:1}
.product-card:hover .icon-wrap{background:linear-gradient(135deg,var(--gold),var(--gold-dark));transform:scale(1.15);box-shadow:0 12px 32px var(--gold-glow)}
.product-card .icon-wrap svg{width:36px;height:36px;transition:filter .4s ease}
.product-card:hover .icon-wrap svg{filter:brightness(0) invert(1)}
.product-card h4{font-size:1.1rem;font-weight:700;color:var(--charcoal-dark);letter-spacing:2px;position:relative;z-index:1}

/* Products 标题暗色覆盖 */
.products .section-title h2{color:var(--white)}
.products .section-title p{color:var(--text-muted)}

/* Advantages - 工厂实景 + 锻造火星 */
.advantages{
    position:relative;overflow:hidden;color:var(--text-light);
    background:url('../images/factory-4.jpg') center/cover no-repeat;
    background-attachment:fixed;
    background-color:#0d0d0d;
}
.advantages::before{
    content:'';position:absolute;inset:0;z-index:0;
    background:rgba(10,10,10,.82);
}
/* 底部金色分隔条 */
.advantages::after{
    content:'';position:absolute;bottom:0;left:0;width:100%;height:3px;z-index:2;
    background:linear-gradient(90deg,transparent,var(--gold) 30%,var(--gold-light) 50%,var(--gold) 70%,transparent);
    opacity:.8;
}
.advantages .sparks-container{position:absolute;inset:0;pointer-events:none;overflow:hidden;z-index:1}
.advantages .spark{position:absolute;width:2px;height:2px;background:var(--gold);border-radius:50%;animation:sparkFly 3s ease-out infinite;opacity:0}
@keyframes sparkFly{0%{opacity:0;transform:translate(0,0) scale(1)}10%{opacity:1}50%{opacity:.8}80%{opacity:.3;transform:translate(var(--dx),var(--dy)) scale(.3)}100%{opacity:0;transform:translate(var(--dx),var(--dy)) scale(0)}}
.advantages .section-title h2{color:var(--white)}.advantages .section-title p{color:var(--text-muted)}
.advantages-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:30px;position:relative;z-index:1}
.advantage-item{text-align:center;padding:36px 24px;border:1px solid rgba(255,255,255,.06);border-radius:6px;transition:all .4s ease;background:rgba(255,255,255,.01);position:relative;overflow:hidden}
.advantage-item::before{content:'';position:absolute;top:0;left:0;width:100%;height:1px;background:linear-gradient(90deg,transparent,var(--gold),transparent);opacity:0;transition:opacity .4s ease}
.advantage-item:hover{border-color:rgba(201,167,107,.4);background:rgba(201,167,107,.04);transform:translateY(-4px);box-shadow:0 16px 40px rgba(0,0,0,.4),0 0 30px rgba(201,167,107,.05)}
.advantage-item:hover::before{opacity:1}
.advantage-item .adv-icon svg{width:48px;height:48px;margin-bottom:16px}
.advantage-item h4{font-size:1.05rem;font-weight:700;color:var(--gold);margin-bottom:10px;letter-spacing:1px}
.advantage-item p{font-size:.9rem;color:#999;line-height:1.7}

/* Contact - 9.jpg 实景背景 */
.contact{
    position:relative;overflow:hidden;color:var(--text-light);
    background:url('../images/9.jpg') center/cover no-repeat;
    background-attachment:fixed;
    background-color:#121212;
}
.contact::before{
    content:'';position:absolute;inset:0;z-index:0;
    background:rgba(10,10,10,.8);
}
.contact .section-title h2{color:var(--white)}.contact .section-title p{color:var(--text-muted)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;position:relative;z-index:1}
.contact-info{padding-right:40px}
.contact-info h3{font-size:2rem;font-weight:700;color:var(--white);margin-bottom:16px;letter-spacing:1px}
.contact-info h3 .gold{color:var(--gold)}
.contact-info>p{color:var(--text-muted);margin-bottom:36px;font-size:1rem}
.contact-detail{display:flex;align-items:flex-start;gap:16px;margin-bottom:28px}
.contact-detail .c-icon{width:52px;height:52px;background:rgba(201,167,107,.1);border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;transition:all .3s ease}
.contact-detail:hover .c-icon{background:rgba(201,167,107,.2);box-shadow:0 0 20px rgba(201,167,107,.15)}
.contact-detail .c-icon svg{width:24px;height:24px}
.contact-detail .c-text h4{font-size:.8rem;color:var(--text-muted);letter-spacing:2px;margin-bottom:4px}
.contact-detail .c-text .value{font-size:1.1rem;font-weight:600;color:var(--white);letter-spacing:1px}
.contact-detail .c-text .phone-big{font-size:2.2rem;font-weight:900;color:var(--gold);letter-spacing:2px}
.contact-qr{display:flex;flex-direction:column;align-items:center;text-align:center}
.contact-qr .qr-wrapper{background:var(--white);padding:28px;border-radius:8px;box-shadow:0 8px 40px rgba(0,0,0,.5),0 0 0 1px rgba(201,167,107,.15);transition:transform .3s ease}
.contact-qr .qr-wrapper:hover{transform:scale(1.03)}
.contact-qr .qr-wrapper img{width:220px;height:220px;object-fit:contain}
.contact-qr .qr-label{margin-top:16px;color:var(--text-muted);font-size:.9rem;letter-spacing:1px}

/* Footer - 纯黑背景 */
.footer{
    background:#080808;
    padding:40px 0;text-align:center;
    border-top:1px solid rgba(201,167,107,.08);
}
.footer::before{content:none}
.footer .container{position:relative;z-index:1}
.footer .footer-logo{color:var(--gold);font-size:1.2rem;font-weight:700;letter-spacing:2px;margin-bottom:12px}
.footer p{color:#666;font-size:.85rem;letter-spacing:1px;line-height:1.8}
.footer a{color:#888;text-decoration:none;transition:color .3s}
.footer a:hover{color:var(--gold)}

/* ========== Responsive ========== */
@media(max-width:768px){
    .nav-links{position:fixed;top:0;right:-100%;width:70%;max-width:320px;height:100vh;background:rgba(26,26,26,.98);backdrop-filter:blur(12px);flex-direction:column;justify-content:center;align-items:center;gap:40px;transition:right .4s ease}
    .nav-links.active{right:0}.nav-links a{font-size:1.2rem}.hamburger{display:flex}
    .hero-content h1{font-size:2rem;letter-spacing:2px}.hero-content .subtitle{font-size:1rem}.hero-content .cta-btn{padding:14px 36px;font-size:.9rem}
    .about .container{grid-template-columns:1fr;gap:40px}.about-coil{width:260px;height:260px}
    .about-coil .ring:nth-child(1){width:240px;height:240px}.about-coil .ring:nth-child(2){width:190px;height:190px}
    .about-coil .ring:nth-child(3){width:145px;height:145px}.about-coil .ring:nth-child(4){width:100px;height:100px}
    .about-coil .ring:nth-child(5){width:60px;height:60px}.about-coil .center-dot{width:30px;height:30px}
    .products-grid{grid-template-columns:repeat(2,1fr);gap:16px}.product-card{padding:28px 18px}.product-card h4{font-size:.95rem;letter-spacing:1px}
    .advantages-grid{grid-template-columns:repeat(2,1fr);gap:16px}.contact-grid{grid-template-columns:1fr;gap:40px}.contact-info{padding-right:0}
    .section{padding:70px 0}.section-title h2{font-size:1.8rem}
    .about,.products,.advantages{background-attachment:scroll}
}
@media(max-width:480px){
    .hero-content h1{font-size:1.5rem;letter-spacing:1px}.hero-content .badge{font-size:.6rem;padding:6px 14px;letter-spacing:2px}
    .products-grid{grid-template-columns:1fr 1fr;gap:10px}.product-card{padding:20px 12px}.product-card h4{font-size:.8rem}
    .product-card .icon-wrap{width:52px;height:52px;margin-bottom:12px}.product-card .icon-wrap svg{width:28px;height:28px}
    .advantages-grid{grid-template-columns:1fr;gap:12px}
    .contact-detail .c-text .phone-big{font-size:1.5rem}.contact-qr .qr-wrapper img{width:160px;height:160px}
    .section{padding:50px 0}.section-title{margin-bottom:36px}.section-title h2{font-size:1.5rem}
}