*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0d0b16;--bg2:#161328;--bg3:#1e1a35;
  --text:#e8e6f0;--muted:#9b96b0;--accent:#e91e63;
  --accent2:#9c27b0;--gold:#ffc107;--border:#2a2545;
  --radius:12px;--shadow:0 4px 24px rgba(0,0,0,.35);
  --max:1140px;--header-h:64px
}
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(--accent);text-decoration:none;transition:color .2s}
a:hover{color:#ff6090}
img{max-width:100%;height:auto;display:block}
.container{width:min(100% - 2rem,var(--max));margin-inline:auto}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(13,11,22,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h);gap:1rem}
.logo{display:flex;align-items:center;gap:.6rem;color:var(--text);font-weight:700;font-size:1.15rem}
.logo img{width:36px;height:36px;border-radius:8px}
.nav-main{display:flex;gap:.25rem;flex-wrap:wrap}
.nav-main a{color:var(--muted);padding:.45rem .85rem;border-radius:8px;font-size:.92rem}
.nav-main a:hover,.nav-main a.active{color:#fff;background:var(--bg3)}
.menu-toggle{display:none;background:none;border:1px solid var(--border);color:var(--text);padding:.4rem .7rem;border-radius:8px;cursor:pointer;font-size:1rem}

/* Hero */
.hero{padding:3rem 0 2.5rem;background:linear-gradient(180deg,var(--bg2) 0%,var(--bg) 100%)}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:2.5rem;align-items:center}
.hero h1{font-size:clamp(1.6rem,4vw,2.4rem);line-height:1.3;margin-bottom:1rem;background:linear-gradient(135deg,#fff 30%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-lead{color:var(--muted);font-size:1.05rem;margin-bottom:1.5rem}
.hero-tags{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem}
.tag{display:inline-block;padding:.25rem .75rem;background:var(--bg3);border:1px solid var(--border);border-radius:20px;font-size:.82rem;color:var(--muted)}
.btn{display:inline-block;padding:.7rem 1.6rem;border-radius:10px;font-weight:600;font-size:.95rem;transition:transform .2s,box-shadow .2s}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;box-shadow:0 4px 16px rgba(233,30,99,.3)}
.btn-primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 6px 20px rgba(233,30,99,.45)}
.btn-outline{border:1px solid var(--border);color:var(--text);margin-left:.75rem}
.btn-outline:hover{color:#fff;border-color:var(--accent)}
.hero-img{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border)}

/* Sections */
section{padding:3rem 0}
.section-title{font-size:1.55rem;margin-bottom:.5rem;position:relative;padding-left:1rem}
.section-title::before{content:"";position:absolute;left:0;top:.35em;bottom:.35em;width:4px;background:linear-gradient(var(--accent),var(--accent2));border-radius:2px}
.section-desc{color:var(--muted);margin-bottom:2rem;max-width:720px}
.section-alt{background:var(--bg2)}

/* Cards & Grid */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.25rem}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem}
.card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;transition:transform .2s,border-color .2s}
.card:hover{transform:translateY(-3px);border-color:rgba(233,30,99,.4)}
.card-body{padding:1.15rem}
.card h3{font-size:1.05rem;margin-bottom:.4rem}
.card p{color:var(--muted);font-size:.9rem;line-height:1.6}
.card-img{aspect-ratio:9/16;object-fit:cover;width:100%;background:var(--bg2)}
.card-img-wide{aspect-ratio:16/10;object-fit:cover;width:100%;background:var(--bg2)}

/* Feature list */
.feature-list{list-style:none;display:grid;gap:.75rem}
.feature-list li{padding:.85rem 1rem;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);display:flex;gap:.75rem;align-items:flex-start}
.feature-list li strong{color:var(--gold);min-width:5em;flex-shrink:0}

/* Steps */
.steps{counter-reset:step;display:grid;gap:1.25rem}
.step{counter-increment:step;padding:1.25rem 1.25rem 1.25rem 4rem;background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);position:relative}
.step::before{content:counter(step);position:absolute;left:1.25rem;top:1.25rem;width:2rem;height:2rem;background:linear-gradient(135deg,var(--accent),var(--accent2));border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.9rem;color:#fff;line-height:2rem;text-align:center}
.step h3{font-size:1.05rem;margin-bottom:.35rem}

/* FAQ */
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:.75rem;overflow:hidden;background:var(--bg3)}
.faq-q{padding:1rem 1.25rem;font-weight:600;cursor:pointer;display:flex;justify-content:space-between;align-items:center}
.faq-q::after{content:"+";color:var(--accent);font-size:1.2rem}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{padding:0 1.25rem;max-height:0;overflow:hidden;transition:max-height .3s,padding .3s;color:var(--muted);font-size:.93rem}
.faq-item.open .faq-a{max-height:500px;padding:0 1.25rem 1rem}

/* Content page */
.page-hero{padding:2.5rem 0 1.5rem;background:var(--bg2);border-bottom:1px solid var(--border)}
.page-hero h1{font-size:clamp(1.4rem,3vw,2rem);margin-bottom:.5rem}
.page-hero p{color:var(--muted)}
.content-page{padding:2.5rem 0 4rem}
.content-page h2{font-size:1.25rem;margin:2rem 0 .75rem;color:#fff}
.content-page h3{font-size:1.05rem;margin:1.5rem 0 .5rem;color:var(--text)}
.content-page p,.content-page li{color:var(--muted);margin-bottom:.75rem}
.content-page ul,.content-page ol{padding-left:1.5rem;margin-bottom:1rem}
.content-page ul li{list-style:disc}

/* Breadcrumb */
.breadcrumb{padding:1rem 0;font-size:.85rem;color:var(--muted)}
.breadcrumb a{color:var(--muted)}
.breadcrumb a:hover{color:var(--accent)}
.breadcrumb span{margin:0 .4rem}

/* Footer */
.site-footer{background:var(--bg2);border-top:1px solid var(--border);padding:2.5rem 0 1.5rem;margin-top:2rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:2rem;margin-bottom:2rem}
.footer-brand p{color:var(--muted);font-size:.9rem;margin-top:.75rem;max-width:360px}
.footer-col h4{font-size:.95rem;margin-bottom:.75rem;color:#fff}
.footer-col ul{list-style:none}
.footer-col li{margin-bottom:.45rem}
.footer-col a{color:var(--muted);font-size:.88rem}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{border-top:1px solid var(--border);padding-top:1.25rem;display:flex;flex-wrap:wrap;justify-content:space-between;gap:.5rem;font-size:.82rem;color:var(--muted)}

/* Error pages */
.error-page{min-height:80vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.error-page h1{font-size:4rem;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:.5rem}
.error-page p{color:var(--muted);margin-bottom:1.5rem}

/* TOC sidebar for long pages */
.with-toc{display:grid;grid-template-columns:220px 1fr;gap:2.5rem;align-items:start}
.toc{position:sticky;top:calc(var(--header-h) + 1.5rem);background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem}
.toc h4{font-size:.85rem;color:var(--muted);margin-bottom:.75rem;text-transform:uppercase;letter-spacing:.05em}
.toc a{display:block;color:var(--muted);font-size:.88rem;padding:.35rem 0;border-left:2px solid transparent;padding-left:.75rem}
.toc a:hover{color:var(--accent);border-left-color:var(--accent)}

/* Image showcase */
.img-showcase{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;align-items:center;margin:2rem 0}
.img-showcase img{border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow)}
.img-showcase.reverse{direction:rtl}
.img-showcase.reverse>*{direction:ltr}

/* Mobile */
@media(max-width:900px){
  .hero-grid,.grid-2,.grid-3,.grid-4,.footer-grid,.with-toc,.img-showcase{grid-template-columns:1fr}
  .img-showcase.reverse{direction:ltr}
  .nav-main{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:var(--bg2);border-bottom:1px solid var(--border);padding:1rem;flex-direction:column}
  .nav-main.open{display:flex}
  .menu-toggle{display:block}
  .site-header .container{position:relative}
  .btn-outline{margin-left:0;margin-top:.75rem;display:inline-block}
  .toc{position:static}
  .card-img{aspect-ratio:9/14}
}
@media(max-width:480px){
  .grid-2{grid-template-columns:1fr}
  section{padding:2rem 0}
}