:root {
    --primary-dark: #0a0f18;
    --primary-blue: #b41206;
    --accent-blue: #e70a1a;
    --text-main: #334155;
    --text-muted: #64748b;
    --bg-light: #f0f0f0;
    --bg-light-white: #ffffff;
    --border-color: rgba(244, 67, 54, 0.15);
    --btn-gradient: linear-gradient(135deg, #971309, #e70a1a);
    --solid-shadow: 0 0 10px 0 rgba(10, 15, 24, 0.5);
    --hover-shadow: 0 25px 50px -12px rgba(244, 67, 54, 0.15), 0 10px 15px -5px rgba(244, 67, 54, 0.1);
    --glow-shadow: 0 0 20px rgba(231, 10, 26, 0.5);
    --ease-tech: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-bounce: cubic-bezier(0.175, 0.885, 0.32, 1.275);
    --header-h: 90px;
    --header-h-scrolled: 70px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Roboto Condensed', sans-serif; background-color: #fff; color: var(--text-main); overflow-x: hidden; width: 100vw; -webkit-font-smoothing: antialiased; background-image: radial-gradient(rgba(231,10,26,0.03) 1px, transparent 1px); background-size: 25px 25px; }
a { text-decoration: none; color: inherit; transition: all 0.3s var(--ease-tech); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; user-select: none; }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: #0a0f18; }
::-webkit-scrollbar-thumb { background: var(--primary-blue); border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent-blue); }

.container { max-width: 1600px; margin: 0 auto; padding: 0 40px; width: 100%; }

.section-header { text-align: center; margin-bottom: 70px; }
.section-subtitle { color: var(--primary-blue); font-size: 20px; font-weight: 600; margin-bottom: 15px; letter-spacing: 0.2px; text-transform: uppercase; font-family: sans-serif; }
.section-subtitle::before { content: '// '; color: var(--accent-blue); }
.section-title { font-family: 'Oswald', sans-serif; font-size: 46px; color: var(--primary-dark); text-transform: uppercase; letter-spacing: 1px; }

.reveal { opacity: 0; transform: translateY(30px); transition: opacity 0.6s var(--ease-tech), transform 0.6s var(--ease-tech); will-change: transform, opacity; }
.reveal.active { opacity: 1; transform: translateY(0); }
.delay-1 { transition-delay: 0.1s; } .delay-2 { transition-delay: 0.15s; } .delay-3 { transition-delay: 0.2s; } .delay-4 { transition-delay: 0.25s; }
.delay-5 { transition-delay: 0.3s; } .delay-6 { transition-delay: 0.35s; } .delay-7 { transition-delay: 0.4s; } .delay-8 { transition-delay: 0.45s; } .delay-9 { transition-delay: 0.5s; } .delay-10 { transition-delay: 0.55s; }

/* ================= 头部 ================= */
.site-header { width: 100%; background-color: rgba(255,255,255,0.98); position: fixed; top: 0; z-index: 1000; border-bottom: 1px solid var(--border-color); transition: all 0.4s var(--ease-tech); height: var(--header-h); }
.site-header.scrolled { height: var(--header-h-scrolled); box-shadow: 0 10px 30px rgba(10, 15, 24, 0.08); border-bottom-color: transparent; background-color: rgba(255,255,255,0.95); backdrop-filter: blur(10px); }

.header-container { position: relative; max-width: 1600px; margin: 0 auto; padding: 0 40px; display: flex; align-items: center; justify-content: space-between; height: 100%; }

.header-logo { position:relative; display: flex; align-items: center; overflow: hidden; }
.header-logo img { max-height: 55px; max-width: 250px; transition: all 0.4s var(--ease-tech); }
.site-header.scrolled .header-logo img { max-height: 45px; }
.header-logo:hover img { transform: scale(1.05); filter: drop-shadow(0 0 10px rgba(231,10,26,0.3)); }

.header-logo::before{content: "";position: absolute;left: -800px;top: -460px;width: 400px;height: 15px;background-color: rgba(255, 255, 255, .4);-webkit-transform: rotate(-45deg);-moz-transform: rotate(-45deg);-ms-transform: rotate(-45deg);-o-transform: rotate(-45deg);transform: rotate(-45deg);-webkit-animation: searchLights 1.5s ease-in 1.5s infinite;-o-animation: searchLights 1.5s ease-in 1.5s infinite;animation: searchLights 1.5s ease-in 1.5s infinite;}
@-webkit-keyframes searchLights{0%{left: -100px;top: 0;}to{left: 120px;top: 100px;}}
@-o-keyframes searchLights{0%{left: -100px;top: 0;}to{left: 120px;top: 100px;}}
@-moz-keyframes searchLights{0%{left: -100px;top: 0;}to{left: 120px;top: 100px;}}
@keyframes searchLights{0%{left: -100px;top: 0;}to{left: 120px;top: 100px;}}

.header-right { flex: 1; display: flex; align-items: center; justify-content: flex-end; gap: 40px; margin-left: 30px; height: 100%; }

nav { height: 100%; }
.main-menu { display: flex; gap: 20px; height: 100%; }

.menu-item { height: 100%; display: flex; align-items: center; cursor: pointer; } 
.menu-item:not(.mega-dropdown-trigger) { position: relative; } 

.menu-item > a { display: flex; align-items: center; font-size: 16px; font-weight: 700; color: var(--primary-dark); text-transform: uppercase; position: relative; }
.menu-item > a::after { content: ''; position: absolute; bottom: -6px; left: 0; width: 100%; height: 2px; background: var(--accent-blue); transform: scaleX(0); transform-origin: right; transition: transform 0.3s var(--ease-tech); }
.menu-item:hover > a, .menu-item.active > a { color: var(--primary-blue); }
.menu-item:hover > a::after, .menu-item.active > a::after { transform: scaleX(1); transform-origin: left; }
.menu-item i { margin-left: 5px; font-size: 11px; transition: transform 0.3s; }
.menu-item:hover i { transform: rotate(180deg); color: var(--primary-blue); }

.dropdown { position: absolute; top: 100%; left: 0; margin-top: 0; background-color: rgba(255,255,255,0.98); backdrop-filter: blur(10px); min-width: 250px; border-radius: 4px; border-top-left-radius: 0; border-top-right-radius: 0; box-shadow: var(--hover-shadow); padding: 15px 0; opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(10px); transition: all 0.3s var(--ease-tech); z-index: 101; border-top: 2px solid var(--accent-blue); }
.menu-item:hover .dropdown { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
.dropdown li a { display: block; padding: 12px 25px; color: var(--text-main); font-size: 15px; font-family: 'Roboto', sans-serif; transition: all 0.3s; }
.dropdown li a:hover { color: var(--accent-blue); padding-left: 35px; background-color: var(--bg-light); font-weight: 600; }

.mega-menu { position: absolute; top: 100%; left: 0; width: 100%; margin-top: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(15px); border-top: 2px solid var(--accent-blue); box-shadow: var(--hover-shadow); padding: 40px 30px; opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(10px); transition: all 0.4s var(--ease-tech); z-index: 102; }
.mega-dropdown-trigger:hover .mega-menu { opacity: 1; visibility: visible; pointer-events: auto; transform: translateY(0); }
.mega-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; max-width: 1600px; margin: 0 auto; }
.mega-card { display: flex; flex-direction: column; align-items: center; background: #fff; border: 1px solid var(--border-color); border-radius: 4px; padding: 25px 15px; text-align: center; transition: all 0.3s; position: relative; z-index: 1; }
.mega-card-img { width: 100%; height: 210px; display: flex; justify-content: center; align-items: center; margin-bottom: 15px; }
.mega-card-img img { max-height: 100%; max-width: 90%; object-fit: contain; mix-blend-mode: multiply; transition: transform 0.4s, filter 0.4s; }
.mega-card span { font-family: 'Roboto Condensed', sans-serif; font-size: 14px; font-weight: 700; color: var(--primary-dark); transition: color 0.3s ease; text-transform: uppercase;}
.mega-card:hover { border-color: var(--accent-blue); box-shadow: var(--glow-shadow); transform: translateY(-5px); }
.mega-card:hover .mega-card-img img { transform: scale(1.15); filter: drop-shadow(0 10px 10px rgba(231, 10, 26, 0.2)); }
.mega-card:hover span { color: var(--accent-blue); }

.header-tools { display: flex; align-items: center; gap: 20px; height: 100%; }

.search-wrapper { height: 100%; display: flex; align-items: center; justify-content: center; cursor: pointer; position: relative; }
.search-trigger { font-size: 18px; color: var(--primary-dark); transition: color 0.3s; display: flex; justify-content: center; align-items: center; width: 30px; height: 30px; }
.search-wrapper:hover .search-trigger { color: var(--primary-blue); }

.search-dropdown { position: absolute; top: 100%; right: -20px; margin-top: 0; background-color: rgba(255,255,255,0.98); backdrop-filter: blur(10px); width: 320px; border-radius: 4px; border-top-right-radius: 0; box-shadow: var(--hover-shadow); padding: 25px; opacity: 0; visibility: hidden; transform: translateY(10px); transition: all 0.3s var(--ease-tech); z-index: 101; border-top: 2px solid var(--accent-blue); cursor: default; }
.search-wrapper:hover .search-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }

.search-input-box { display: flex; align-items: center; background: var(--bg-light); border: 1px solid var(--border-color); border-radius: 4px; overflow: hidden; transition: all 0.3s; }
.search-input-box:focus-within { border-color: var(--accent-blue); box-shadow: 0 0 10px rgba(231, 10, 26, 0.15); background: #fff;}
.search-input-box input { width: 100%; border: none; background: transparent; padding: 14px 15px; outline: none; font-size: 14px; font-family: 'Roboto', sans-serif; color: var(--text-main); }
.search-input-box button { background: var(--btn-gradient); border: none; color: #fff; padding: 0 18px; align-self: stretch; cursor: pointer; transition: opacity 0.3s; }
.search-input-box button:hover { opacity: 0.9; }

.action-area { display: flex; align-items: center; margin-left: 10px;}
.btn-premium { position: relative; overflow: hidden; display: inline-block; background: var(--btn-gradient); color: white; padding: 13px 32px; border: 1px solid rgba(231,10,26,0.3); border-radius: 4px; font-size: 14px; font-weight: 700; cursor: pointer; transition: all 0.3s var(--ease-tech); white-space: nowrap; text-transform: uppercase; z-index: 1; letter-spacing: 1px; }
.btn-premium::before { content: ''; position: absolute; inset: 0; background: var(--btn-gradient); z-index: -1; transform: scaleX(0); transform-origin: left; transition: transform 0.4s var(--ease-tech); }
.btn-premium:hover::before { transform: scaleX(1); }
.btn-premium:hover { box-shadow: var(--glow-shadow); border-color: transparent; letter-spacing: 2px; }

.mobile-menu-toggle { display: none; font-size: 28px; color: var(--primary-dark); cursor: pointer; }

/* ================= 大图轮播 ================= */
.video-container{position:relative;width:100%; height: 120vh; margin-top: 90px; max-height:1080px;overflow:hidden;background:#000}
.video-container .fallback-image,.video-container video{position:absolute;top:0;left:0;width:100%;height:100%;object-fit:cover;z-index:1}
.play-button{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);z-index:3;cursor:pointer;width:80px;height:80px;border:2px solid rgba(255,255,255,.5);border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .4s ease;opacity:0;visibility:hidden;pointer-events:none}
.play-icon{width:0;height:0;border-top:10px solid transparent;border-bottom:10px solid transparent;border-left:20px solid #fff;margin-left:5px}
.play-button:hover{background:rgba(255,255,255,.2);transform:translate(-50%,-50%) scale(1.1)}
.video-container.need-interaction .play-button,.video-container.video-unavailable .play-button{opacity:1;visibility:visible;pointer-events:auto}

/* ================= 产品 ================= */
.products-section { padding: 80px 0; background-color: var(--bg-light); }
.product-card { background-color: #fff; padding: 10px; display: flex; flex-direction: column; align-items: center; box-shadow: var(--solid-shadow); border-radius: 4px; transition: all 0.4s var(--ease-tech); cursor: pointer; position: relative; overflow: hidden; border: 1px solid var(--border-color);}
.product-card .scanner { position: absolute; top: -100%; left: 0; width: 100%; height: 2px; background: var(--accent-blue); box-shadow: 0 0 15px 2px var(--accent-blue); opacity: 0; z-index: 5; pointer-events: none; }
.product-card::before { content: ''; position: absolute; top: 0; left: 0; width: 20px; height: 20px; border-top: 2px solid var(--accent-blue); border-left: 2px solid var(--accent-blue); opacity: 0; transition: 0.3s; z-index: 2; }
.product-card::after { content: ''; position: absolute; bottom: 0; right: 0; width: 20px; height: 20px; border-bottom: 2px solid var(--accent-blue); border-right: 2px solid var(--accent-blue); opacity: 0; transition: 0.3s; z-index: 2; }
.card-image-wrapper { height: auto; width: 100%; display: flex; justify-content: center; align-items: center; margin-bottom: 35px; transition: transform 0.5s var(--ease-tech); position: relative; z-index: 3;}
.card-image-wrapper img { max-width: 100%; max-height: 100%; object-fit: contain; mix-blend-mode: multiply; transition: filter 0.4s; }
.product-title { font-size: 20px; font-weight: 700; color: var(--primary-dark); margin-bottom: 25px; text-align: center; transition: color 0.3s; position: relative; z-index: 3;}

.btn-learn-more { position: relative; display: inline-block;  background: var(--btn-gradient); color: #fff; padding: 10px 30px; font-size: 13px; font-weight: 700; text-transform: uppercase; border: 1px solid var(--btn-gradient); transition: all 0.3s; z-index: 3; }

.product-card:hover { transform: translateY(-10px); box-shadow: var(--hover-shadow); border-color: rgba(231,10,26,0.3); }
.product-card:hover::before, .product-card:hover::after { opacity: 1; }
.product-card:hover .scanner { animation: scan 2.5s linear infinite; opacity: 1; }

.productSwiper { width: 100%; padding: 20px 20px 50px 20px !important; overflow: hidden; }
.productSwiper .swiper-slide {height: auto; }
.productSwiper .product-card {height: 100%;}
.product-prev { left: 0; } 
.product-next { right: 0; }

@keyframes scan { 0% { top: -10%; opacity: 0; } 10% { opacity: 1; } 90% { opacity: 1; } 100% { top: 110%; opacity: 0; } }

.product-card:hover .product-title { color: var(--accent-blue); }
.product-card:hover .card-image-wrapper { transform: scale(1.1); }
.product-card:hover .card-image-wrapper img { filter: drop-shadow(0 15px 20px rgba(231, 10, 26, 0.15)); }
.product-card:hover .btn-learn-more { background: var(--primary-blue); color: #fff; border-color: transparent; box-shadow: var(--glow-shadow); }

/* ================= 物料 ================= */
.materials-section { background-color: #fff; padding: 80px 0; }
.materials-section .section-title { color: var(--primary-dark); }
.material-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2px; background: rgba(231,10,26,0.1); border: 1px solid rgba(231,10,26,0%); } 

.mat-item { position: relative; height: 250px; overflow: hidden; cursor: pointer; background: #000; }
.mat-bg { position: absolute; inset: 0; background-size: cover; background-position: center; transition: transform 0.8s var(--ease-tech), filter 0.5s; filter: grayscale(20%) opacity(0.6); }
.mat-item::before { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(10, 15, 24, 1) 0%, transparent 40%); z-index: 1; }

.mat-content { position: relative; z-index: 3; padding: 40px 30px; height: 100%; display: flex; flex-direction: column; justify-content: flex-end; }
.mat-title { color: #fff; font-size: 24px; font-weight: 700; text-transform: uppercase; line-height: 1.2; transform: translateY(30px); transition: transform 0.5s var(--ease-tech); }
.mat-line { width: 0; height: 2px; background: var(--accent-blue); margin-top: 15px; transition: width 0.5s var(--ease-tech); box-shadow: var(--glow-shadow); }
.mat-btn { margin-top: 15px; color: var(--accent-blue); font-size: 13px; font-weight: 700; opacity: 0; transform: translateY(20px); transition: all 0.5s var(--ease-tech); }

.mat-item:hover .mat-bg { transform: scale(1.1); filter: grayscale(0%) opacity(1); }
.mat-item:hover .mat-title { transform: translateY(0); color: var(--accent-blue); }
.mat-item:hover .mat-line { width: 50px; }
.mat-item:hover .mat-btn { opacity: 1; transform: translateY(0); letter-spacing: 2px; }

/* ================= 服务优势 ================= */
.services-section { position: relative; padding: 120px 0 100px 0; background-size: cover; background-position: center; background-repeat: no-repeat; background-attachment: fixed;}
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; margin-top: 80px; }

.service-card { background-color: var(--bg-light-white); padding: 60px 40px 40px; position: relative; border-radius: 4px; text-align: center; transition: all 0.4s var(--ease-tech); border: 1px solid var(--border-color); overflow: visible; }

.service-card::after { content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); width: 0; height: 3px; background: var(--accent-blue); transition: width 0.4s var(--ease-tech); box-shadow: var(--glow-shadow); border-bottom-left-radius: 4px; border-bottom-right-radius: 4px;}

.icon-box { position: absolute; top: -35px; left: 50%; transform: translateX(-50%); width: 70px; height: 70px; background: #fff; border: 1px solid var(--border-color); display: flex; justify-content: center; align-items: center; color: var(--primary-blue); font-size: 28px; box-shadow: var(--solid-shadow); transition: all 0.5s var(--ease-tech); z-index: 3; border-radius: 4px;}

.service-title { font-size: 32px; font-weight: 700; text-transform: uppercase; color: var(--primary-dark); margin-bottom: 20px; font-family: 'Oswald', sans-serif; }
.service-desc { font-size: 16px; color: var(--text-muted); line-height: 2; text-align: left; }

.service-card:hover { transform: translateY(-8px); background: var(--bg-light); border-color: rgba(231,10,26,0.2); box-shadow: var(--hover-shadow); }
.service-card:hover::after { width: 100%; }
.service-card:hover .icon-box { background: var(--btn-gradient); color: #fff; border-color: transparent; box-shadow: var(--glow-shadow); transform: translateX(-50%) rotate(45deg); }
.service-card:hover .icon-box i { transform: rotate(-45deg); } 

/* ================= 案例 ================= */
.projects-section { display: none; padding: 120px 0; background-color: var(--bg-light); }
.carousel-wrapper { position: relative; padding: 0 70px; }
.projectSwiper { width: 100%; padding: 20px 0; overflow: hidden; }

.project-card { background-color: #fff; box-shadow: var(--solid-shadow); border-radius: 4px; overflow: hidden; display: flex; flex-direction: column; transition: all 0.4s var(--ease-tech); cursor:pointer; border: 1px solid var(--border-color); }
.project-img-wrap { overflow: hidden; height: 260px; position: relative;}
.project-img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s var(--ease-tech); filter: brightness(0.85);}

.project-card:hover { transform: translateY(-10px); box-shadow: var(--hover-shadow); border-color: var(--accent-blue);}
.project-card:hover .project-img { transform: scale(1.1); filter: brightness(1); }

.project-info { padding: 30px; position: relative; }
.project-info::before { content:''; position: absolute; top:0; left:30px; width:40px; height:2px; background:var(--accent-blue); transition: width 0.3s;}
.project-card:hover .project-info::before { width: calc(100% - 60px); }
.project-info h3 { font-size: 20px; color: var(--primary-dark); margin-bottom: 10px; font-weight: 700; transition: color 0.3s; margin-top: 10px;}
.project-card:hover .project-info h3 { color: var(--accent-blue);}
.project-info p { font-size: 14px; color: var(--text-muted); display: flex; align-items: center; gap: 8px;}
.project-info p i { color: var(--accent-blue); }

.carousel-btn { position: absolute; top: 50%; transform: translateY(-50%); background: #fff; border: 1px solid var(--border-color); width: 50px; height: 50px; display: flex; justify-content: center; align-items: center; font-size: 18px; color: var(--primary-dark); cursor: pointer; transition: all 0.3s; z-index: 10; box-shadow: var(--solid-shadow); border-radius: 4px;}
.carousel-btn:hover { background: var(--accent-blue); color: #fff; border-color: transparent; box-shadow: var(--glow-shadow); }
.project-prev { left: 0; } .project-next { right: 0; }

.project-pagination { display: flex; justify-content: center; gap: 10px; margin-top: 30px; position: relative; z-index: 10; }
.project-pagination .swiper-pagination-bullet { width: 30px; height: 4px; background-color: #cbd5e1; border-radius: 0; opacity: 1; margin: 0 !important; cursor: pointer; transition: all 0.3s; }
.project-pagination .swiper-pagination-bullet-active { background-color: var(--accent-blue); box-shadow: 0 0 10px rgba(231,10,26,0.5); }

.center-btn-wrap { text-align: center; margin-top: 50px; }

/* ================= 表单 ================= */
.quote-section { position: relative; padding: 80px 0; background-size: contain; background-position: center; background-repeat: no-repeat;}
.quote-container { max-width: 900px; margin: 0 auto; padding: 0 20px; position: relative; z-index: 2; }
.quote-title { text-align: center; font-family: 'Oswald', sans-serif; font-size: 38px; font-weight: 700; color: var(--primary-dark); margin-bottom: 50px; letter-spacing: 1px; }
.quote-form { display: flex; flex-direction: column; gap: 30px; }
.form-row { display: flex; gap: 30px; }
.form-group { position: relative; width: 100%; }
.form-input, .form-textarea { width: 100%; background-color: var(--bg-light-white); border: 1px solid var(--border-color); padding: 18px 20px; font-size: 15px; font-family: 'Inter', sans-serif; color: var(--text-main); outline: none; transition: all 0.3s var(--ease-tech); border-radius: 2px;}
.form-textarea { resize: vertical; min-height: 120px; }
.form-input:focus, .form-textarea:focus { border-color: var(--primary-blue); }
.floating-label { position: absolute; left: 20px; top: 19px; color: var(--text-muted); font-size: 15px; pointer-events: none; transition: all 0.3s var(--ease-tech); }
.form-input:focus ~ .floating-label, .form-input:not(:placeholder-shown) ~ .floating-label,
.form-textarea:focus ~ .floating-label, .form-textarea:not(:placeholder-shown) ~ .floating-label { top: -10px; left: 15px; font-size: 13px; color: var(--primary-blue); background: var(--bg-light-white); padding: 0 5px; }
.btn-submit { width: 100%; padding: 18px; font-size: 16px; font-weight: 600; margin-top: 10px; background-color: var(--primary-blue); color: var(--bg-light-white); border: none; cursor: pointer; transition: all 0.3s var(--ease-tech);}
.btn-submit:hover { background-color: var(--primary-blue); box-shadow: var(--solid-shadow);}

/* ================= 底部齿状效果 ================= */
.zig-zag-divider { position: absolute; bottom: -1px; left: 0; width: 100%; height: 10px; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 35' preserveAspectRatio='none'%3E%3Cpolygon points='0,35 12,0 24,35' fill='%230a0f18'/%3E%3C/svg%3E"); background-size: 15px 10px; background-repeat: repeat-x; z-index: 10;}
/* ================= 脚部 ================= */
.site-footer { background-color: var(--primary-dark); color: #94a3b8; padding: 80px 0 30px; border-top: 1px solid rgba(255,255,255,0.05); }
.footer-top { display: grid; grid-template-columns: 1.6fr 1fr 1.2fr 1.2fr 1.2fr 1.6fr; gap: 20px; max-width: 1600px; margin: 0 auto; padding: 0 40px 60px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.footer-logo { max-width: 200px; margin-bottom: 30px; filter: brightness(0) invert(1); }
.footer-desc { font-size: 14px; line-height: 1.8; margin-bottom: 30px; }
.footer-title { color: #fff; font-family: 'Oswald', sans-serif; font-size: 20px; font-weight: 500; margin-bottom: 30px; letter-spacing: 1px; }
.footer-links li { margin-bottom: 15px; }
.footer-links a { font-size: 14px; transition: all 0.3s; position: relative; display: inline-block; }
.footer-links a:hover { color: var(--accent-blue); transform: translateX(5px); }
.contact-list li { display: flex; align-items: flex-start; gap: 15px; margin-bottom: 20px; font-size: 14px; line-height: 1.6; }
.contact-list i { color: var(--accent-blue); font-size: 16px; margin-top: 3px; }

.footer-bottom { max-width: 1600px; margin: 0 auto; display: flex; justify-content: space-between; align-items: center; padding: 30px 40px 0; font-size: 13px; position: relative; }
.footer-bottom p { margin-bottom: 0; color: #64748b; }
.footer-social { display: flex; gap: 10px; }
.footer-social a { display: flex; justify-content: center; align-items: center; width: 36px; height: 36px; border-radius: 50%; color: #fff; font-size: 14px; transition: transform 0.3s var(--ease-bounce), box-shadow 0.3s; }
.footer-social a.fb { background-color: #3b5998; } 
.footer-social a.yt { background-color: #ff0000; } 
.footer-social a.in { background-color: #0077b5; } 
.footer-social a.mail { background-color: #64748b; }
.footer-social a:hover { transform: translateY(-4px) scale(1.05); box-shadow: 0 5px 15px rgba(0,0,0, 0.3); }

/* ================= 侧边悬浮 ================= */
.side-float-buttons { position: fixed; right: 30px; top: 50%; transform: translateY(-50%); z-index: 999; display: flex; flex-direction: column; gap: 15px; }
.side-btn { width: 45px; height: 45px; display: flex; justify-content: center; align-items: center; color: white; font-size: 20px; transition: all 0.3s var(--ease-bounce); border-radius: 4px; box-shadow: 0 10px 20px rgba(10,15,24,0.2); }
.side-btn.whatsapp { background-color: #16a34a; } .side-btn.whatsapp:hover { background-color: #15803d; transform: scale(1.1); box-shadow: 0 0 15px rgba(22, 163, 74, 0.6); }
.side-btn.email { background-color: #ea580c; } .side-btn.email:hover { background-color: #c2410c; transform: scale(1.1); box-shadow: 0 0 15px rgba(234, 88, 12, 0.6); }

.back-to-top { position: fixed; right: 30px; bottom: 30px; width: 45px; height: 45px; background: var(--accent-blue); box-shadow: var(--glow-shadow); border-color: transparent; color: var(--bg-light-white); display: flex; justify-content: center; align-items: center; font-size: 20px; cursor: pointer; transition: all 0.4s var(--ease-tech); z-index: 999; border-radius: 4px; opacity: 0; visibility: hidden; transform: translateY(20px); }
.back-to-top.show { opacity: 1; visibility: visible; transform: translateY(0); }

/* ================= 询盘弹窗 ================= */
.inquire-modal-wrapper { position: fixed; top: 0; left: 0; width: 100%; height: 100%;z-index: 2000; display: flex; justify-content: center; align-items: center; visibility: hidden; opacity: 0; transition: all 0.3s var(--ease-tech);}
.inquire-modal-wrapper.show { visibility: visible; opacity: 1; }
.modal-overlay {  position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-box { position: relative; background: #fff; width: 90%; max-width: 800px; padding: 45px 40px; border-radius: 4px; z-index: 1; transform: translateY(30px); transition: all 0.4s var(--ease-tech); box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);}
.inquire-modal-wrapper.show .modal-box { transform: translateY(0); }
.modal-close-btn { position: absolute; top: 20px; right: 20px; width: 24px; height: 24px; border: 1px dashed #94a3b8; display: flex; justify-content: center; align-items: center; cursor: pointer; color: #64748b; transition: all 0.3s; background: transparent; font-size: 14px;}
.modal-close-btn:hover { color: var(--primary-dark); border-color: var(--primary-dark); background: #f1f5f9; }
.modal-title { text-align: center; font-size: 28px; font-weight: 700; color: #1e293b; margin-bottom: 15px; font-family: 'Roboto Condensed', sans-serif;}
.modal-subtitle { text-align: center; color: #64748b; font-size: 15px; margin-bottom: 25px; }
.modal-form { display: flex; flex-direction: column; gap: 15px; }
.modal-input { width: 100%; padding: 14px 15px; background: #eff4fa; border: 1px solid transparent; border-radius: 2px; font-size: 14px; font-family: 'Roboto', sans-serif; color: #334155; outline: none; transition: all 0.3s;}
.modal-input::placeholder { color: #94a3b8; }
.modal-input:focus { background: #fff; border-color: #cbd5e1; box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.1); }
textarea.modal-input { resize: vertical; min-height: 100px; }
.modal-btn-send { background: var(--primary-blue); color: var(--bg-light-white); padding: 14px; border: none; border-radius: 2px; font-weight: 600; font-size: 15px; cursor: pointer; transition: background 0.3s; margin-top: 5px;}
.modal-btn-send:hover { background: var(--accent-blue); }
.modal-footer-note { margin-top: 20px; font-size: 13px; color: var(--text-main); line-height: 1.6;}
.modal-footer-note a { color: var(--accent-blue); }
.modal-footer-note a:hover { text-decoration: underline; }

/* ================= 移动端底部导航栏 ================= */
.mobile-bottom-nav{display:none}
@media (max-width:992px){
    .mobile-bottom-nav{display:flex;position:fixed;bottom:0;left:0;width:100%;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);box-shadow:0 -5px 20px rgba(10,15,24,.08);z-index:1001;padding-bottom:env(safe-area-inset-bottom)}
    .mobile-bottom-nav .nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:12px 0 8px;color:var(--text-muted);text-decoration:none;position:relative;transition:all .3s}
    .mobile-bottom-nav .nav-item i{font-size:20px;margin-bottom:4px;transition:transform .4s var(--ease-bounce),color .3s}
    .mobile-bottom-nav .nav-item span{font-size:11px;font-weight:600;text-transform:uppercase;font-family:'Roboto Condensed',sans-serif}
    .mobile-bottom-nav .nav-item::before{content:'';position:absolute;top:0;left:50%;transform:translateX(-50%);width:0;height:3px;background:var(--accent-blue);border-radius:0 0 4px 4px;transition:width .3s ease;box-shadow:var(--glow-shadow)}
    .mobile-bottom-nav .nav-item.active,.mobile-bottom-nav .nav-item:hover{color:var(--primary-blue)}
    .mobile-bottom-nav .nav-item.active i,.mobile-bottom-nav .nav-item:hover i{transform:translateY(-4px);color:var(--primary-blue)}
    .mobile-bottom-nav .nav-item.active::before,.mobile-bottom-nav .nav-item:hover::before{width:35px}
    .mobile-bottom-nav .nav-item.call-btn{color:var(--primary-dark)}
    .mobile-bottom-nav .nav-item.call-btn::before{display:none}
    .mobile-bottom-nav .nav-item.call-btn .icon-wrapper{width:50px;height:50px;background:var(--btn-gradient);border-radius:50%;display:flex;justify-content:center;align-items:center;margin-top:-30px;margin-bottom:6px;box-shadow:var(--hover-shadow);border:4px solid #fff;transition:transform .4s var(--ease-bounce)}
    .mobile-bottom-nav .nav-item.call-btn i{margin:0;color:#fff;font-size:20px;transform:none!important}
    .mobile-bottom-nav .nav-item.call-btn:hover .icon-wrapper{transform:translateY(-5px) scale(1.05);box-shadow:var(--glow-shadow)}
    .side-float-buttons{display:none!important}
    .back-to-top{bottom:90px!important}
}

/* ================= 响应式 ================= */
@media (max-width: 1200px) {
    .header-container, .container, .slide-content { padding: 0 20px; }
    .footer-top { padding: 0 20px 60px; }
    .footer-bottom { padding: 30px 20px 0; }
    .header-right { gap: 20px; margin-left: 20px;}
    .main-menu { gap: 20px; }
}
@media (max-width: 1100px) {
    .material-grid, .services-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-top { grid-template-columns: repeat(2, 1fr); gap: 50px;}
    .mega-menu { display: none !important; } 
}
@media (max-width: 992px) {
    .mobile-menu-toggle { display: block; }
    .site-header { height: 80px; }
    .site-header.scrolled { height: 70px; }
    .header-container { padding: 0 25px; }
    .header-right { position: absolute; top: 100%; left: 0; width: 100%; height: calc(100vh - 80px); background: #fff; flex-direction: column; align-items: stretch; justify-content: flex-start; margin: 0; padding: 20px 25px 120px 25px; display: none;  border-top: 1px solid var(--border-color); overflow-y: auto !important; -webkit-overflow-scrolling: touch; }
    .header-right.active { display: flex; }
    .site-header.scrolled .header-right { height: calc(100vh - 70px); }
    
    .header-right::-webkit-scrollbar { width: 4px; }
    .header-right::-webkit-scrollbar-track { background: transparent; }
    .header-right::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
    
    nav { width: 100%; height: auto; margin-bottom: 25px; flex-shrink: 0; }
    .main-menu { height: auto; width: 100%; flex-direction: column; justify-content: flex-start; align-items: stretch; gap: 0; }
    
    .menu-item { height: auto; padding: 0; align-items: stretch; flex-direction: column; width: 100%; border-bottom: 1px solid rgba(0,0,0,0.05); }
    .menu-item:last-child { border-bottom: none; }
    
    .header-tools { width: 100%; height: auto; margin-bottom: 20px; flex-shrink: 0; }
    .search-wrapper { width: 100%; padding: 0; cursor: default; height: auto; }
    .search-trigger { display: none; } 
    .search-dropdown { position: static; visibility: visible; opacity: 1; transform: none; width: 100%; box-shadow: none; border: none; padding: 0; background: transparent; display: block; }
    .search-input-box { border-color: var(--border-color); }
    
    .action-area { flex-direction: column; align-items: stretch; width: 100%; gap: 15px; margin-left: 0; flex-shrink: 0; }
    .btn-premium { width: 100%; justify-content: center; text-align: center; padding: 15px; }
    
    .dropdown { position: static; visibility: visible; opacity: 1; transform: none; top: auto; left: auto; box-shadow: none; border: none; padding-left: 0; display: none; border-top: none; }
    .menu-item:hover .dropdown { display: none; }
    .mega-dropdown-trigger:hover .mega-menu { display: none !important; }
    
    .menu-item > a { display: flex; justify-content: space-between; align-items: center; width: 100%; padding: 16px 0; }
    .menu-item > a::after { display: none; } 
    
    .menu-item > a i { display: flex; justify-content: center; align-items: center; width: 40px; height: 40px; margin: 0 -10px 0 auto; font-size: 14px; color: var(--text-muted); transform-origin: center center; transition: transform 0.3s ease, color 0.3s ease; }
    
    .menu-item.mobile-open > .dropdown { display: block !important; position: static; opacity: 1; visibility: visible; background-color: #f8fafc; padding: 5px 0; margin: 0 0 15px 0; width: 100%; border-radius: 4px; box-shadow: inset 0 3px 8px rgba(0,0,0,.03); }
    .menu-item.mobile-open > .dropdown li a { padding: 12px 20px; font-size: 14px; color: var(--text-main); font-weight: 500; border-bottom: 1px solid rgba(0,0,0,.03); }
    .menu-item.mobile-open > .dropdown li:last-child a { border-bottom: none; }
    .menu-item.mobile-open > .dropdown li a:hover { background-color: transparent; color: var(--primary-blue); padding-left: 20px; }
    
    .menu-item.mobile-open > .mega-menu { display: block !important; position: static; opacity: 1; visibility: visible; background-color: #f8fafc; padding: 15px; margin: 0 0 15px 0; width: 100%; border-radius: 4px; box-shadow: inset 0 3px 8px rgba(0,0,0,.03); }
    .mega-grid { gap: 10px; }
    .mega-card { padding: 10px; border-color: rgba(0,0,0,.05); }
    .mega-card-img { height: 60px; margin-bottom: 8px; }
    .mega-card span { font-size: 12px; }
    
    .menu-item.mobile-open > a { color: var(--primary-blue); }
    .menu-item.mobile-open > a i { transform: rotate(180deg); color: var(--primary-blue); }

    .quote-container { padding: 40px 20px; }
    .form-row { flex-direction: column; gap: 30px; }
}
@media (max-width: 768px) {
    .video-container{ height: 200px; margin-top: 80px;}
    .products-section,.materials-section,.quote-section{ padding: 50px 0;}
    .section-header{ margin-bottom: 30px;}
    .section-subtitle{ font-size: 16px; font-weight: 500;}
    .section-title { font-size: 32px; }
    .slide-title { font-size: 40px; } .slider-btn { display: none; }
    .material-grid { grid-template-columns: 1fr 1fr; }
    .services-grid { grid-template-columns: 1fr; }
    .carousel-wrapper { padding: 0 20px; } .carousel-btn { display: none; }
    .footer-top { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px 20px;}
    .footer-top > div:first-child, .footer-top > div:last-child { grid-column: span 2; }
    .mega-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 20px; text-align: center; padding-bottom: 50px;}
    .side-float-buttons { top: auto; bottom: 80px; right: 15px; transform: none;}
    .back-to-top { right: 15px; bottom: 15px; }
    .modal-box { padding: 30px 20px; }
}