*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f0f14;--bg2:#1a1a24;--bg3:#252532;
  --text:#e8e8ef;--muted:#9a9ab0;
  --accent:#ff6b35;--accent2:#e84393;--accent3:#a855f7;
  --gradient:linear-gradient(135deg,#ff6b35,#e84393,#a855f7);
  --radius:12px;--max:1200px;
  --shadow:0 4px 24px rgba(0,0,0,.4);
  --header-h:68px
}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;background:var(--bg);color:var(--text);line-height:1.75;min-height:100vh}
a{color:var(--accent2);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent)}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,15,20,.92);backdrop-filter:blur(12px);border-bottom:1px solid rgba(255,255,255,.06)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;max-width:var(--max);margin:0 auto}
.logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1.15rem}
.logo img{width:40px;height:40px;border-radius:10px}
.nav-desktop{display:flex;gap:28px;list-style:none}
.nav-desktop a{color:var(--muted);font-size:.95rem}
.nav-desktop a:hover,.nav-desktop a.active{color:var(--text)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer;padding:4px 8px}
.nav-mobile{display:none;flex-direction:column;background:var(--bg2);padding:12px 20px;border-top:1px solid rgba(255,255,255,.06)}
.nav-mobile.open{display:flex;position:absolute;left:0;right:0;top:100%;width:100%;z-index:101;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.nav-mobile a{padding:10px 0;color:var(--muted);border-bottom:1px solid rgba(255,255,255,.04)}
.nav-mobile a:last-child{border:none}

/* Hero */
.hero{padding:60px 0 50px;background:radial-gradient(ellipse at 50% 0%,rgba(168,85,247,.15),transparent 60%)}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.hero h1{font-size:2.2rem;line-height:1.3;margin-bottom:16px;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{color:var(--muted);font-size:1.05rem;margin-bottom:24px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:50px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn-primary{background:var(--gradient);color:#fff;box-shadow:0 4px 20px rgba(232,67,147,.3)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 6px 28px rgba(232,67,147,.45);color:#fff}
.btn-outline{background:transparent;color:var(--text);border:1px solid rgba(255,255,255,.15)}
.btn-outline:hover{border-color:var(--accent2);color:var(--accent2)}
.hero-img{border-radius:16px;box-shadow:var(--shadow);border:1px solid rgba(255,255,255,.08)}

/* Sections */
section{padding:50px 0}
.section-title{font-size:1.6rem;margin-bottom:8px;position:relative;padding-left:16px}
.section-title::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:4px;height:24px;background:var(--gradient);border-radius:2px}
.section-sub{color:var(--muted);margin-bottom:32px;font-size:.95rem}
.bg-alt{background:var(--bg2)}

/* Cards */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{background:var(--bg3);border-radius:var(--radius);overflow:hidden;border:1px solid rgba(255,255,255,.06);transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card-body{padding:18px}
.card-body h3{font-size:1.05rem;margin-bottom:8px}
.card-body p{color:var(--muted);font-size:.9rem;line-height:1.6}
.card img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}

/* Feature grid */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:30px}
.feature-item{display:flex;gap:20px;align-items:flex-start}
.feature-icon{width:48px;height:48px;border-radius:12px;background:var(--gradient);display:flex;align-items:center;justify-content:center;font-size:1.3rem;flex-shrink:0}
.feature-item h3{font-size:1.05rem;margin-bottom:6px}
.feature-item p{color:var(--muted);font-size:.92rem}

/* Content block */
.content-block{max-width:860px}
.content-block h2{font-size:1.35rem;margin:32px 0 14px;color:var(--text)}
.content-block h3{font-size:1.1rem;margin:24px 0 10px}
.content-block p,.content-block li{color:var(--muted);margin-bottom:14px;font-size:.95rem}
.content-block ul,.content-block ol{padding-left:22px;margin-bottom:16px}
.content-block li{margin-bottom:8px}
.content-block img{margin:20px 0;border:1px solid rgba(255,255,255,.08)}

/* Image showcase */
.showcase{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:24px 0}
.showcase img{border-radius:10px;border:1px solid rgba(255,255,255,.06);transition:transform .2s}
.showcase img:hover{transform:scale(1.03)}

/* Steps */
.steps{counter-reset:step;display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin:24px 0}
.step{background:var(--bg3);padding:24px 18px;border-radius:var(--radius);text-align:center;border:1px solid rgba(255,255,255,.06);position:relative}
.step::before{counter-increment:step;content:counter(step);display:block;width:36px;height:36px;line-height:36px;border-radius:50%;background:var(--gradient);color:#fff;font-weight:700;margin:0 auto 12px;font-size:.95rem}
.step h4{font-size:.95rem;margin-bottom:6px}
.step p{color:var(--muted);font-size:.85rem}

/* FAQ */
.faq-item{border-bottom:1px solid rgba(255,255,255,.06);padding:18px 0}
.faq-item h3{font-size:1rem;margin-bottom:8px;cursor:pointer}
.faq-item p{color:var(--muted);font-size:.92rem}

/* TOC */
.toc{background:var(--bg3);padding:24px;border-radius:var(--radius);margin-bottom:32px;border:1px solid rgba(255,255,255,.06)}
.toc h3{font-size:1rem;margin-bottom:12px}
.toc ol{padding-left:20px}
.toc li{margin-bottom:6px;font-size:.92rem}

/* Footer */
.site-footer{background:var(--bg2);border-top:1px solid rgba(255,255,255,.06);padding:40px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-brand p{color:var(--muted);font-size:.88rem;margin-top:10px;line-height:1.6}
.footer-col h4{font-size:.95rem;margin-bottom:14px}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:8px}
.footer-col a{color:var(--muted);font-size:.88rem}
.footer-col a:hover{color:var(--accent2)}
.footer-bottom{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.06);color:var(--muted);font-size:.82rem}

/* Legal pages */
.page-header{padding:40px 0 20px;text-align:center}
.page-header h1{font-size:1.8rem;margin-bottom:10px}
.page-header p{color:var(--muted);font-size:.95rem}
.legal-content{padding:30px 0 50px}
.legal-content .container{max-width:860px}

/* Error pages */
.error-page{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:70vh;text-align:center;padding:40px 20px}
.error-page h1{font-size:5rem;background:var(--gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.error-page h2{margin:16px 0 10px;font-size:1.4rem}
.error-page p{color:var(--muted);margin-bottom:24px;max-width:480px}

/* Breadcrumb */
.breadcrumb{padding:16px 0;font-size:.85rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{margin:0 8px}

/* Responsive */
@media(max-width:992px){
  .hero-grid{grid-template-columns:1fr;text-align:center}
  .hero-btns{justify-content:center}
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .showcase{grid-template-columns:repeat(3,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:768px){
  .nav-desktop{display:none}
  .menu-toggle{display:block}
  .hero h1{font-size:1.6rem}
  .hero{padding:36px 0 30px}
  .feature-grid{grid-template-columns:1fr}
  .card-grid{grid-template-columns:1fr}
  .showcase{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  section{padding:36px 0}
  .section-title{font-size:1.3rem}
}