/* === Reset & Base === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:#1a1a2e;line-height:1.6;overflow-x:hidden}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
a{text-decoration:none;color:inherit}
img{max-width:100%}

/* === Header === */
.header{position:fixed;top:0;left:0;right:0;z-index:1000;padding:16px 0;transition:background .3s,box-shadow .3s}
.header.scrolled{background:rgba(255,255,255,.95);backdrop-filter:blur(10px);box-shadow:0 2px 20px rgba(0,0,0,.08)}
.header .container{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:8px;font-size:1.4rem;font-weight:700;color:#fff;transition:color .3s}
.header.scrolled .logo{color:#1a1a2e}
.logo-icon{font-size:1.8rem}
.nav{display:flex;gap:32px}
.nav a{color:#fff;font-size:.95rem;transition:color .3s;position:relative}
.nav a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:#4caf50;transition:width .3s}
.nav a:hover::after{width:100%}
.header.scrolled .nav a{color:#333}
.header.scrolled .nav a:hover{color:#4caf50}

/* hamburger */
.menu-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:4px}
.menu-toggle span{display:block;width:24px;height:2px;background:#fff;transition:all .3s}
.header.scrolled .menu-toggle span{background:#1a1a2e}

/* === Hero === */
.hero{height:100vh;min-height:600px;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;position:relative;background:linear-gradient(135deg,#0f2027 0%,#203a43 30%,#2c5364 60%,#1d5b3f 100%);color:#fff;overflow:hidden}
.hero::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");opacity:.4}
.hero-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:radial-gradient(circle at 20% 50%,rgba(76,175,80,.15) 0%,transparent 50%),radial-gradient(circle at 80% 20%,rgba(76,175,80,.1) 0%,transparent 50%)}
.hero-content{position:relative;z-index:2;max-width:800px;padding:0 24px}
.hero-content h1{font-size:3.5rem;font-weight:800;margin-bottom:24px;letter-spacing:2px;animation:fadeInUp 1s ease}
.hero-subtitle{font-size:1.25rem;line-height:2;opacity:.9;margin-bottom:40px;animation:fadeInUp 1s ease .2s both}
.hero-buttons{display:flex;gap:16px;justify-content:center;flex-wrap:wrap;animation:fadeInUp 1s ease .4s both}
.hero-stats{position:relative;z-index:2;display:flex;gap:60px;margin-top:80px;animation:fadeInUp 1s ease .6s both}
.stat-item{text-align:center}
.stat-number{font-size:2.5rem;font-weight:800;color:#4caf50}
.stat-unit{font-size:1.2rem;font-weight:700;color:#4caf50}
.stat-item p{font-size:.9rem;opacity:.7;margin-top:4px}
.hero-scroll{position:absolute;bottom:30px;z-index:2;display:flex;flex-direction:column;align-items:center;gap:8px;opacity:.6;animation:bounce 2s infinite}
.hero-scroll span{font-size:.8rem}
.scroll-arrow{width:20px;height:20px;border-right:2px solid #fff;border-bottom:2px solid #fff;transform:rotate(45deg)}

@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(10px)}}

/* === Buttons === */
.btn{display:inline-block;padding:14px 36px;border-radius:50px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.btn-primary{background:#4caf50;color:#fff}
.btn-primary:hover{background:#43a047;transform:translateY(-2px);box-shadow:0 8px 25px rgba(76,175,80,.4)}
.btn-outline{border:2px solid #fff;color:#fff}
.btn-outline:hover{background:#fff;color:#1a1a2e}
.btn-sm{padding:10px 24px;font-size:.9rem;border-radius:6px}
.btn-full{width:100%}

/* === Sections === */
section{padding:100px 0}
.section-header{text-align:center;margin-bottom:60px}
.section-tag{display:inline-block;padding:6px 20px;background:rgba(76,175,80,.1);color:#4caf50;border-radius:50px;font-size:.85rem;font-weight:600;margin-bottom:16px}
.section-header h2{font-size:2.4rem;font-weight:700;margin-bottom:16px;color:#1a1a2e}
.section-header p{font-size:1.1rem;color:#666;max-width:600px;margin:0 auto}

/* === About === */
.about{background:#fff}
.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}
.about-text h3{font-size:1.6rem;margin-bottom:16px;color:#1a1a2e}
.about-text p{margin-bottom:12px;color:#555;line-height:1.8}
.about-features{margin-top:24px;display:flex;flex-direction:column;gap:16px}
.about-feat{display:flex;align-items:flex-start;gap:12px}
.feat-icon{font-size:1.5rem;flex-shrink:0}
.about-feat h4{font-size:1rem}
.about-feat p{font-size:.85rem;color:#888;margin:0}

/* === Products === */
.products{background:#f8faf8}
.product-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.product-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 2px 20px rgba(0,0,0,.06);transition:transform .3s,box-shadow .3s}
.product-card:hover{transform:translateY(-8px);box-shadow:0 16px 40px rgba(0,0,0,.12)}
.product-info{padding:28px}
.product-category{display:inline-block;padding:4px 12px;background:#e8f5e9;color:#388e3c;border-radius:50px;font-size:.8rem;font-weight:600;margin-bottom:12px}
.product-info h3{font-size:1.3rem;margin-bottom:12px}
.product-info p{font-size:.9rem;color:#666;margin-bottom:16px;line-height:1.7}
.product-specs{list-style:none;margin-bottom:20px}
.product-specs li{font-size:.85rem;color:#555;padding:6px 0;border-bottom:1px solid #f0f0f0}
.product-specs li::before{content:'✓';color:#4caf50;margin-right:8px;font-weight:700}

/* === Advantages === */
.advantages{background:#fff}
.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.adv-card{text-align:center;padding:40px 24px;border-radius:16px;background:#fff;box-shadow:0 2px 20px rgba(0,0,0,.05);transition:transform .3s}
.adv-card:hover{transform:translateY(-4px)}
.adv-icon{font-size:2.8rem;display:block;margin-bottom:20px}
.adv-card h3{font-size:1.1rem;margin-bottom:12px}
.adv-card p{font-size:.9rem;color:#666;line-height:1.7}

/* === Cases === */
.cases{background:#f8faf8}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:30px}
.case-card{background:#fff;border-radius:16px;overflow:hidden;box-shadow:0 2px 20px rgba(0,0,0,.06);transition:transform .3s}
.case-card:hover{transform:translateY(-4px)}
.case-tag{display:inline-block;margin:20px 20px 0;padding:4px 12px;background:#e8f5e9;color:#388e3c;border-radius:50px;font-size:.8rem;font-weight:600}
.case-card h3{padding:12px 20px 0;font-size:1.1rem}
.case-card p{padding:8px 20px 20px;font-size:.9rem;color:#666;line-height:1.7}

/* === Contact === */
.contact{background:linear-gradient(135deg,#0f2027 0%,#203a43 100%);color:#fff}
.contact .section-header h2{color:#fff}
.contact .section-header p{color:rgba(255,255,255,.7)}
.contact .section-tag{background:rgba(76,175,80,.2);color:#66bb6a}
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:60px;align-items:start}
.contact-info{display:flex;flex-direction:column;gap:24px}
.contact-item{display:flex;align-items:center;gap:16px}
.contact-icon{font-size:1.4rem;width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:rgba(76,175,80,.15);border-radius:12px}
.contact-item h4{font-size:.9rem;margin-bottom:2px}
.contact-item p{font-size:.95rem;opacity:.85}
.contact-qr{text-align:center;margin-top:16px}
.qr-placeholder{width:100px;height:100px;background:rgba(255,255,255,.1);border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:.8rem;margin:0 auto 8px;border:1px solid rgba(255,255,255,.2)}
.contact-form{display:flex;flex-direction:column;gap:16px}
.contact-form input,.contact-form select,.contact-form textarea{width:100%;padding:14px 16px;border-radius:8px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);color:#fff;font-size:.95rem;outline:none;transition:border .3s}
.contact-form input:focus,.contact-form select:focus,.contact-form textarea:focus{border-color:#4caf50}
.contact-form input::placeholder,.contact-form textarea::placeholder{color:rgba(255,255,255,.4)}
.contact-form select{color:rgba(255,255,255,.6)}
.contact-form select option{color:#1a1a2e;background:#fff}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}

/* === Footer === */
.footer{background:#111827;color:#9ca3af;padding:60px 0 20px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.5fr;gap:40px;margin-bottom:40px}
.footer-brand h3{color:#fff;font-size:1.2rem;margin-bottom:8px}
.footer-brand p{font-size:.9rem}
.footer-links h4{color:#fff;font-size:1rem;margin-bottom:16px}
.footer-links a{display:block;margin-bottom:10px;font-size:.9rem;transition:color .3s}
.footer-links a:hover{color:#4caf50}
.newsletter-form{display:flex;gap:8px;margin-top:12px}
.newsletter-form input{flex:1;padding:10px 14px;border-radius:6px;border:1px solid #374151;background:#1f2937;color:#fff;font-size:.9rem;outline:none}
.newsletter-form input:focus{border-color:#4caf50}
.newsletter-form .btn{white-space:nowrap}
.footer-bottom{border-top:1px solid #1f2937;padding-top:20px;text-align:center;font-size:.85rem}
.footer-bottom a{color:#6b7280;transition:color .3s}
.footer-bottom a:hover{color:#4caf50}

/* === Image Placeholder === */
.image-placeholder{width:100%;aspect-ratio:4/3;background:linear-gradient(135deg,#e8f5e9,#c8e6c9);border-radius:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;font-size:3rem;color:#388e3c}
.image-placeholder.sm{aspect-ratio:16/10;font-size:2.5rem}
.case-image .image-placeholder{background:linear-gradient(135deg,#e3f2fd,#bbdefb);color:#1565c0}
.about-image .image-placeholder{background:linear-gradient(135deg,#e8f5e9,#a5d6a7);font-size:4rem}

/* Product & case images */
.product-image img,.case-image img,.about-image img{width:100%;height:100%;object-fit:cover;display:block}
.product-image{border-radius:16px 16px 0 0;overflow:hidden;aspect-ratio:16/10}
.case-image{border-radius:16px 16px 0 0;overflow:hidden;aspect-ratio:16/10}
.about-image{border-radius:12px;overflow:hidden}

/* === Responsive === */
@media(max-width:992px){
  .hero-content h1{font-size:2.5rem}
  .product-grid,.case-grid{grid-template-columns:repeat(2,1fr)}
  .adv-grid{grid-template-columns:repeat(2,1fr)}
  .contact-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .menu-toggle{display:flex}
  .nav{position:fixed;top:0;right:-100%;width:70%;height:100vh;background:#fff;flex-direction:column;padding:80px 30px;gap:20px;transition:right .3s;box-shadow:-4px 0 20px rgba(0,0,0,.1)}
  .nav.active{right:0}
  .nav a{color:#333!important;font-size:1.1rem}
  .product-grid,.case-grid{grid-template-columns:1fr}
  .adv-grid{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .hero-content h1{font-size:2rem}
  .hero-stats{gap:30px}
  .stat-number{font-size:1.8rem}
  .footer-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .hero-subtitle{font-size:1rem}
  section{padding:60px 0}
}