*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#0f1117;--bg2:#181b24;--bg3:#1e2230;
  --text:#e8eaef;--text2:#9aa0b0;--accent:#ff6b8a;
  --accent2:#ff9f43;--border:#2a2f3d;--radius:12px;
  --max:1200px;--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:1.7;min-height:100vh}
a{color:var(--accent);text-decoration:none;transition:color .2s}
a:hover{color:var(--accent2)}
img{max-width:100%;height:auto;display:block}
.container{max-width:var(--max);margin:0 auto;padding:0 20px}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(15,17,23,.95);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);height:var(--header-h)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:var(--header-h)}
.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--text)}
.logo img{width:36px;height:36px;border-radius:8px}
.nav{display:flex;gap:6px}
.nav a{padding:8px 14px;border-radius:8px;color:var(--text2);font-size:.9rem}
.nav a:hover,.nav a.active{color:var(--accent);background:rgba(255,107,138,.08)}
.menu-toggle{display:none;background:none;border:none;color:var(--text);font-size:1.5rem;cursor:pointer;padding:4px 8px}

/* Hero */
.hero{padding:60px 0 40px;background:linear-gradient(180deg,var(--bg2) 0%,var(--bg) 100%)}
.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:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.hero-desc{color:var(--text2);font-size:1.05rem;margin-bottom:24px}
.hero-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:10px;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:transform .2s,box-shadow .2s}
.btn-primary{background:linear-gradient(135deg,var(--accent),#ff4d6d);color:#fff}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 24px rgba(255,107,138,.3);color:#fff}
.btn-outline{background:transparent;border:1px solid var(--border);color:var(--text)}
.btn-outline:hover{border-color:var(--accent);color:var(--accent)}
.hero-img{border-radius:var(--radius);overflow:hidden;box-shadow:0 20px 60px rgba(0,0,0,.4)}

/* Sections */
section{padding:56px 0}
.section-title{text-align:center;margin-bottom:12px;font-size:1.75rem}
.section-sub{text-align:center;color:var(--text2);margin-bottom:40px;max-width:640px;margin-left:auto;margin-right:auto}
.section-alt{background:var(--bg2)}

/* Feature cards */
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:28px;transition:border-color .2s,transform .2s}
.feature-card:hover{border-color:var(--accent);transform:translateY(-4px)}
.feature-card h3{font-size:1.1rem;margin-bottom:10px;color:var(--text)}
.feature-card p{color:var(--text2);font-size:.92rem}

/* Category grid */
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cat-item{background:var(--bg3);border-radius:var(--radius);overflow:hidden;border:1px solid var(--border);transition:transform .2s}
.cat-item:hover{transform:translateY(-4px);border-color:var(--accent)}
.cat-item img{width:100%;aspect-ratio:9/16;object-fit:cover;object-position:top}
.cat-item figcaption{padding:12px 14px;font-size:.88rem;color:var(--text2)}

/* Content blocks */
.content-block{display:grid;grid-template-columns:1fr 1fr;gap:36px;align-items:center;margin-bottom:48px}
.content-block.reverse{direction:rtl}
.content-block.reverse>*{direction:ltr}
.content-block h2{font-size:1.4rem;margin-bottom:14px}
.content-block p{color:var(--text2);margin-bottom:12px;font-size:.95rem}
.content-block img{border-radius:var(--radius);box-shadow:0 12px 40px rgba(0,0,0,.3)}

/* Text content */
.prose{max-width:800px;margin:0 auto}
.prose h2{font-size:1.5rem;margin:36px 0 14px;padding-top:12px;border-top:1px solid var(--border)}
.prose h2:first-child{border-top:none;margin-top:0}
.prose h3{font-size:1.15rem;margin:24px 0 10px;color:var(--accent2)}
.prose p,.prose li{color:var(--text2);margin-bottom:12px;font-size:.95rem}
.prose ul,.prose ol{padding-left:24px;margin-bottom:16px}
.prose strong{color:var(--text)}

/* APP section */
.app-section{background:linear-gradient(135deg,#1a1025 0%,var(--bg2) 50%,#101820 100%)}
.app-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.app-features{list-style:none;padding:0}
.app-features li{padding:10px 0 10px 28px;position:relative;color:var(--text2)}
.app-features li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;counter-reset:step}
.step{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:24px;text-align:center}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-weight:700;margin-bottom:12px;font-size:.9rem}
.step h4{font-size:.95rem;margin-bottom:6px}
.step p{color:var(--text2);font-size:.85rem}

/* FAQ */
.faq-item{border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;overflow:hidden}
.faq-q{padding:16px 20px;background:var(--bg3);font-weight:600;cursor:pointer;font-size:.95rem}
.faq-a{padding:0 20px 16px;color:var(--text2);font-size:.92rem;display:none}
.faq-item.open .faq-a{display:block}

/* Footer */
.site-footer{background:var(--bg2);border-top:1px solid var(--border);padding:48px 0 24px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:32px}
.footer-brand p{color:var(--text2);font-size:.88rem;margin-top:10px;line-height:1.6}
.footer-col h4{font-size:.9rem;margin-bottom:14px;color:var(--text)}
.footer-col a{display:block;color:var(--text2);font-size:.85rem;padding:4px 0}
.footer-col a:hover{color:var(--accent)}
.footer-bottom{text-align:center;padding-top:24px;border-top:1px solid var(--border);color:var(--text2);font-size:.82rem}

/* Page header */
.page-header{padding:48px 0 32px;background:var(--bg2);text-align:center;border-bottom:1px solid var(--border)}
.page-header h1{font-size:1.8rem;margin-bottom:8px}
.page-header p{color:var(--text2);font-size:.95rem}
.breadcrumb{font-size:.85rem;color:var(--text2);margin-bottom:12px}
.breadcrumb a{color:var(--text2)}
.breadcrumb a:hover{color:var(--accent)}

/* 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-code{font-size:6rem;font-weight:800;background:linear-gradient(135deg,var(--accent),var(--accent2));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;line-height:1}
.error-page h1{font-size:1.5rem;margin:16px 0 8px}
.error-page p{color:var(--text2);margin-bottom:24px}

/* Internal links box */
.link-box{background:var(--bg3);border:1px solid var(--border);border-radius:var(--radius);padding:20px 24px;margin:32px 0}
.link-box h3{font-size:1rem;margin-bottom:10px}
.link-box a{display:inline-block;margin:4px 12px 4px 0;font-size:.88rem}

/* Responsive */
@media(max-width:992px){
  .hero-grid,.content-block,.app-grid{grid-template-columns:1fr}
  .content-block.reverse{direction:ltr}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .cat-grid{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{position:fixed;top:var(--header-h);left:0;right:0;background:var(--bg2);flex-direction:column;padding:12px 20px;border-bottom:1px solid var(--border);display:none}
  .nav.open{display:flex}
  .menu-toggle{display:block}
  .hero h1{font-size:1.6rem}
  .hero{padding:36px 0 28px}
  .features-grid,.cat-grid{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  section{padding:40px 0}
}
@media(max-width:480px){
  .cat-grid{grid-template-columns:1fr 1fr}
  .hero-btns{flex-direction:column}
  .btn{text-align:center;justify-content:center}
}