*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Segoe UI',Roboto,Helvetica,Arial,sans-serif;background:#1a1a1a;color:#e8e8e8;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,svg{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

.site-header{position:sticky;top:0;z-index:50;background:#212121;border-bottom:1px solid #2e2e2e}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;max-width:1200px;margin:0 auto;gap:10px}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;color:#fff;font-size:14px}
.slot-btn{background:linear-gradient(90deg,#3ee0bf,#1bb89a);color:#000;font-weight:700;padding:9px 18px;border-radius:30px;font-size:14px;white-space:nowrap}
.menu-toggle{background:none;border:none;cursor:pointer;display:flex;flex-direction:column;gap:5px;padding:6px}
.menu-toggle span{width:24px;height:2px;background:#fff;display:block}
.main-nav{display:none;flex-direction:column;background:#1c1c1c;padding:10px 16px;border-top:1px solid #2e2e2e}
.main-nav.open{display:flex}
.main-nav a{padding:12px 0;border-bottom:1px solid #2e2e2e;font-size:15px}
.main-nav a:last-child{border:none}

.side-index{position:fixed;left:0;top:120px;z-index:40}
.side-index button{background:#2a2a2a;color:#fff;border:1px solid #3a3a3a;padding:14px 6px;writing-mode:vertical-rl;cursor:pointer;border-radius:0 6px 6px 0;font-size:13px;display:flex;flex-direction:column;align-items:center;gap:8px}
.side-index .arrow{transform:rotate(-90deg);display:block}
.side-index ul{display:none;position:absolute;left:100%;top:0;background:#222;border:1px solid #333;padding:10px;border-radius:8px;min-width:240px;max-height:60vh;overflow-y:auto;list-style:none}
.side-index.open ul{display:block}
.side-index ul li a{display:block;padding:8px 6px;font-size:13px;color:#ddd;border-bottom:1px solid #2a2a2a}
.side-index ul li a:hover{color:#ff8a1f}

.hero{position:relative;min-height:560px;background-size:cover;background-position:center;display:flex;align-items:center;justify-content:center;padding:40px 16px;text-align:center}
.hero-inner{max-width:720px;width:100%}
.hero-logo{display:flex;justify-content:center;margin-bottom:14px}
.hero-title{font-size:34px;font-weight:900;color:#fff;letter-spacing:2px;line-height:1.1;margin-bottom:14px;text-shadow:0 2px 12px rgba(0,0,0,.7)}
.hero-sub{display:flex;align-items:center;justify-content:center;gap:8px;color:#fff;font-size:18px;font-weight:700;margin-bottom:14px;flex-wrap:wrap}
.hero-sub .star{color:#ffcc33;font-size:24px}
.hero-desc{color:#f0f0f0;font-size:14px;margin-bottom:22px;text-shadow:0 1px 6px rgba(0,0,0,.6)}
.cta{display:inline-block;background:linear-gradient(90deg,#ff8a1f,#ff5e1a);color:#fff;font-weight:800;padding:14px 32px;border-radius:30px;font-size:15px;box-shadow:0 6px 20px rgba(255,90,20,.4);transition:transform .2s}
.cta:hover{transform:translateY(-2px)}
.hero-meta{margin-top:20px;color:#bbb;font-size:13px;letter-spacing:3px}

.crumbs{max-width:1100px;margin:18px auto 0;padding:0 16px;font-size:13px;color:#999}
.crumbs a{color:#ff8a1f}
.crumbs span{margin:0 6px}

.info-block{max-width:1100px;margin:24px auto;padding:0 16px}
.info-grid{background:#222;border-radius:10px;overflow:hidden;border:1px solid #2e2e2e}
.info-card{display:grid;grid-template-columns:42px 1fr auto;align-items:center;gap:12px;padding:16px;border-bottom:1px solid #2e2e2e}
.info-card:last-child{border:none}
.ic-icon{display:flex;align-items:center;justify-content:center}
.ic-title{font-weight:700;color:#fff;font-size:15px}
.ic-val{color:#bbb;font-size:14px;text-align:right}

.author-card{max-width:1100px;margin:24px auto;padding:18px 16px;background:#222;border-radius:10px;display:flex;gap:14px;align-items:center;border:1px solid #2e2e2e}
.author-avatar{flex-shrink:0}
.author-name{font-weight:700;color:#fff;font-size:16px}
.author-role{color:#bbb;font-size:13px;margin-top:2px}
.author-date{color:#888;font-size:12px;margin-top:6px}

.seo-content{max-width:1100px;margin:30px auto;padding:0 16px;color:#dadada}
.seo-content h1{font-size:30px;color:#fff;font-weight:900;line-height:1.2;margin-bottom:18px}
.seo-content h2{font-size:24px;color:#fff;font-weight:800;line-height:1.25;margin:32px 0 14px;padding-left:14px;border-left:4px solid #ff8a1f}
.seo-content h3{font-size:18px;color:#ffb86b;font-weight:700;margin:22px 0 10px}
.seo-content p{margin:10px 0;font-size:15px}
.seo-content .intro{font-size:16px;color:#cfcfcf}
.seo-content ul{margin:10px 0 14px 22px}
.seo-content li{margin:6px 0;font-size:15px}
.seo-content strong{color:#ffd9a8}
.seo-content em{color:#fff}

.faq{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.faq details{background:#222;border:1px solid #2e2e2e;border-radius:8px;padding:14px 16px}
.faq summary{cursor:pointer;font-weight:700;color:#fff;font-size:15px;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq summary::after{content:'+';color:#ff8a1f;font-size:20px;margin-left:10px}
.faq details[open] summary::after{content:'−'}
.faq details p{margin-top:10px;color:#bdbdbd;font-size:14px}

.site-footer{background:#161616;color:#bdbdbd;padding:30px 16px 80px;margin-top:30px;border-top:1px solid #2a2a2a;text-align:center;position:relative}
.foot-badges{display:flex;justify-content:center;align-items:center;gap:24px;margin-bottom:18px;flex-wrap:wrap}
.badge-be{font-weight:700;color:#fff;font-size:18px;border-bottom:2px solid #fff;padding-bottom:2px}
.badge-18{width:46px;height:46px;border:2px solid #fff;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800}
.foot-text{max-width:760px;margin:0 auto 18px;font-size:13px;line-height:1.65}
.foot-copy{color:#fff;font-weight:600;padding:14px 0;border-top:1px solid #2a2a2a;margin-top:14px}
.foot-nav{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;font-size:13px;padding-top:8px}
.foot-nav a:hover{color:#ff8a1f}
.to-top{position:fixed;right:16px;bottom:16px;width:42px;height:42px;border-radius:50%;background:#ff8a1f;border:none;color:#fff;font-size:20px;cursor:pointer;box-shadow:0 6px 18px rgba(0,0,0,.4);z-index:30}

@media(min-width:768px){
 .menu-toggle{display:none}
 .main-nav{display:flex !important;flex-direction:row;background:none;border:none;padding:0;gap:18px}
 .main-nav a{border:none;padding:8px 4px;font-size:14px}
 .header-inner{padding:14px 24px}
 .hero-title{font-size:54px}
 .hero-sub{font-size:22px}
 .info-card{grid-template-columns:50px 1fr 1fr}
 .seo-content h1{font-size:38px}
}
@media(max-width:480px){
 .hero{min-height:520px;padding:30px 14px}
 .hero-title{font-size:28px}
 .hero-sub{font-size:16px}
 .seo-content h1{font-size:26px}
 .seo-content h2{font-size:20px}
 .side-index{top:100px}
 .info-card{grid-template-columns:36px 1fr;grid-template-rows:auto auto}
 .ic-val{grid-column:2;text-align:left;color:#ff8a1f}
}