/* style.css - 必一运动·体育(b-sports)官方网站 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--primary:#1a2a6c;--secondary:#b21f1f;--accent:#fdbb2d;--bg:#f4f7fc;--card-bg:rgba(255,255,255,0.85);--text:#1a1a2e;--glass:rgba(255,255,255,0.25);--shadow:0 8px 32px rgba(0,0,0,0.12);--radius:20px;--transition:0.3s ease}
[data-theme="dark"]{--bg:#0d1117;--card-bg:rgba(30,30,50,0.85);--text:#e6e6fa;--glass:rgba(0,0,0,0.35);--shadow:0 8px 32px rgba(0,0,0,0.6)}
body{font-family:system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;transition:background var(--transition),color var(--transition);overflow-x:hidden}
a{color:var(--primary);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--secondary)}
img,svg{max-width:100%;height:auto;display:block}
ul,ol{list-style:none}
.container{max-width:1280px;margin:0 auto;padding:0 24px}
.glass{background:var(--glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid rgba(255,255,255,0.15)}
.card{background:var(--card-bg);border-radius:var(--radius);box-shadow:var(--shadow);padding:32px;transition:transform var(--transition),box-shadow var(--transition)}
.card:hover{transform:translateY(-6px);box-shadow:0 12px 40px rgba(0,0,0,0.18)}
.btn{display:inline-block;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;padding:14px 36px;border-radius:50px;font-weight:600;border:none;cursor:pointer;transition:transform var(--transition),box-shadow var(--transition);box-shadow:0 4px 15px rgba(26,42,108,0.3)}
.btn:hover{transform:scale(1.04);box-shadow:0 8px 25px rgba(26,42,108,0.45);color:#fff}
.section-title{font-size:2.4rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;text-align:center}
.section-sub{text-align:center;font-size:1.1rem;opacity:0.8;margin-bottom:48px;max-width:700px;margin-left:auto;margin-right:auto}
.grid-2{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:32px}
.grid-3{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}
.fade-up{opacity:0;transform:translateY(30px);transition:opacity 0.7s ease,transform 0.7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}
header{position:fixed;top:0;left:0;width:100%;z-index:1000;padding:12px 0;transition:background var(--transition),box-shadow var(--transition)}
header.scrolled{background:var(--card-bg);backdrop-filter:blur(16px);box-shadow:0 2px 20px rgba(0,0,0,0.1)}
nav{display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-size:1.6rem;font-weight:800;color:var(--primary)}
.logo svg{width:40px;height:40px}
.nav-links{display:flex;gap:28px;font-weight:500}
.nav-links a{position:relative;padding:6px 0}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--secondary);transition:width var(--transition)}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.menu-toggle{display:none;flex-direction:column;gap:5px;cursor:pointer;background:none;border:none;padding:8px}
.menu-toggle span{width:28px;height:3px;background:var(--text);border-radius:4px;transition:var(--transition)}
.dark-toggle{background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--text);padding:4px 8px;border-radius:50%;transition:background var(--transition)}
.dark-toggle:hover{background:var(--glass)}
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px 80px;background:linear-gradient(135deg,#1a2a6c 0%,#b21f1f 50%,#fdbb2d 100%);color:#fff;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;inset:0;background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 800'%3E%3Ccircle cx='100' cy='100' r='80' fill='rgba(255,255,255,0.04)'/%3E%3Ccircle cx='700' cy='200' r='120' fill='rgba(255,255,255,0.03)'/%3E%3Ccircle cx='400' cy='600' r='160' fill='rgba(255,255,255,0.02)'/%3E%3C/svg%3E");background-size:cover}
.hero-content{position:relative;z-index:2;max-width:900px}
.hero h1{font-size:3.8rem;font-weight:900;margin-bottom:20px;line-height:1.2}
.hero p{font-size:1.3rem;opacity:0.9;margin-bottom:40px;max-width:650px;margin-left:auto;margin-right:auto}
.hero .btn{background:#fff;color:var(--primary);font-size:1.1rem}
.hero .btn:hover{background:var(--accent);color:#1a1a2e}
.banner-slider{position:relative;width:100%;overflow:hidden;margin-top:40px;border-radius:var(--radius)}
.banner-slide{display:none;padding:40px;background:rgba(255,255,255,0.08);backdrop-filter:blur(8px);border-radius:var(--radius)}
.banner-slide.active{display:block;animation:fadeIn 0.6s ease}
@keyframes fadeIn{from{opacity:0;transform:scale(0.96)}to{opacity:1;transform:scale(1)}}
.banner-dots{display:flex;justify-content:center;gap:12px;margin-top:20px}
.banner-dots span{width:12px;height:12px;border-radius:50%;background:rgba(255,255,255,0.3);cursor:pointer;transition:background var(--transition)}
.banner-dots span.active{background:#fff}
section{padding:80px 0}
.about,.story,.team,.products,.services,.solutions,.cases,.testimonials,.news,.faq,.howto,.contact,.footer{background:var(--bg)}
.about .card,.story .card{background:var(--card-bg)}
.stats{display:flex;justify-content:center;gap:60px;flex-wrap:wrap;margin:40px 0}
.stat-item{text-align:center}
.stat-number{font-size:3rem;font-weight:800;color:var(--primary)}
.stat-label{font-size:1rem;opacity:0.7}
.timeline{position:relative;padding-left:40px;border-left:3px solid var(--primary)}
.timeline-item{margin-bottom:32px;position:relative}
.timeline-item::before{content:'';position:absolute;left:-47px;top:8px;width:16px;height:16px;border-radius:50%;background:var(--secondary);border:3px solid var(--primary)}
.timeline-item h3{font-size:1.3rem}
.timeline-item span{font-size:0.9rem;opacity:0.6}
.product-card{text-align:center;padding:32px 20px}
.product-card svg{width:80px;height:80px;margin:0 auto 16px}
.testimonial-card{text-align:center;padding:28px}
.testimonial-card svg{width:60px;height:60px;border-radius:50%;margin:0 auto 12px;background:var(--glass)}
.news-card{padding:24px}
.news-card h3{font-size:1.2rem;margin-bottom:8px}
.news-card .date{font-size:0.85rem;opacity:0.5;margin-bottom:8px}
.faq-item{border-bottom:1px solid rgba(0,0,0,0.08);padding:20px 0;cursor:pointer}
.faq-question{display:flex;justify-content:space-between;align-items:center;font-weight:600;font-size:1.1rem}
.faq-question::after{content:'+';font-size:1.6rem;transition:transform var(--transition)}
.faq-item.open .faq-question::after{transform:rotate(45deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.4s ease,padding 0.4s ease;padding-top:0}
.faq-item.open .faq-answer{max-height:400px;padding-top:16px}
.howto-steps{counter-reset:step}
.howto-step{display:flex;gap:20px;margin-bottom:28px;align-items:flex-start}
.howto-step::before{counter-increment:step;content:counter(step);background:var(--primary);color:#fff;width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}
.contact-info{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:24px;margin-top:32px}
.contact-info .card{text-align:center;padding:24px}
.contact-info svg{width:40px;height:40px;margin:0 auto 12px}
.footer{padding:60px 0 30px;background:var(--card-bg);border-top:1px solid rgba(0,0,0,0.05)}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:32px;margin-bottom:40px}
.footer h4{font-size:1.1rem;margin-bottom:16px}
.footer a,.footer p{font-size:0.95rem;opacity:0.75;line-height:2}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid rgba(0,0,0,0.05);font-size:0.85rem;opacity:0.6}
.qr-code{width:100px;height:100px;background:var(--glass);border-radius:12px;margin:8px auto;display:flex;align-items:center;justify-content:center}
.back-to-top{position:fixed;bottom:40px;right:40px;width:50px;height:50px;border-radius:50%;background:var(--primary);color:#fff;border:none;cursor:pointer;font-size:1.5rem;box-shadow:var(--shadow);transition:transform var(--transition),opacity var(--transition);opacity:0;visibility:hidden;z-index:999}
.back-to-top.show{opacity:1;visibility:visible}
.back-to-top:hover{transform:scale(1.1)}
.search-bar{display:flex;gap:8px;max-width:400px;margin:0 auto 40px}
.search-bar input{flex:1;padding:12px 20px;border-radius:50px;border:1px solid rgba(0,0,0,0.1);background:var(--card-bg);color:var(--text);font-size:1rem}
.search-bar button{padding:12px 24px;border-radius:50px;background:var(--primary);color:#fff;border:none;cursor:pointer}
@media (max-width:768px){
.nav-links{display:none;flex-direction:column;position:absolute;top:70px;left:0;width:100%;background:var(--card-bg);backdrop-filter:blur(16px);padding:20px;border-radius:0 0 var(--radius) var(--radius);box-shadow:var(--shadow)}
.nav-links.open{display:flex}
.menu-toggle{display:flex}
.hero h1{font-size:2.4rem}
.section-title{font-size:1.8rem}
.stats{gap:30px}
.stat-number{font-size:2.2rem}
.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
.back-to-top{bottom:20px;right:20px;width:44px;height:44px;font-size:1.2rem}
}
@media (max-width:480px){
.hero h1{font-size:1.8rem}
.hero p{font-size:1rem}
.container{padding:0 16px}
}