:root{
    --bg: #0b1220;
    --panel: #121a2b;
    --primary: #3aa1ff;
    --text: #e6efff;
    --muted: #9fb2d4;
    --accent: #63e2b7;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Arial,"Microsoft YaHei",sans-serif}
a{color:var(--primary);text-decoration:none}
.container{max-width:1120px;margin:0 auto;padding:0 16px}

/* Header */
.site-header{position:sticky;top:0;background:rgba(18,26,43,.85);backdrop-filter:saturate(180%) blur(8px);z-index:1000;border-bottom:1px solid rgba(255,255,255,.08)}
.site-header.scrolled{background:rgba(18,26,43,.95)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-weight:700;font-size:20px;color:#fff}

/* Nav */
.nav-toggle{display:flex;flex-direction:column;gap:4px;background:transparent;border:1px solid rgba(255,255,255,.2);color:#fff;padding:8px;border-radius:8px;cursor:pointer}
.nav-toggle .bar{display:block;width:22px;height:2px;background:#fff}
.nav-menu{list-style:none;margin:0;padding:0;position:fixed;right:16px;top:64px;background:var(--panel);border:1px solid rgba(255,255,255,.08);border-radius:12px;width:220px;max-height:0;overflow:hidden;transition:max-height .25s ease}
.nav-menu.open{max-height:320px}
.nav-menu li{border-bottom:1px solid rgba(255,255,255,.06)}
.nav-menu li:last-child{border-bottom:none}
.nav-menu a{display:block;padding:12px 14px;color:#fff}
@media(min-width:900px){
    .nav-toggle{display:none}
    nav{display:block}
    .nav-menu{position:static;display:flex;gap:18px;background:transparent;border:none;width:auto;max-height:none}
    .nav-menu a{padding:8px 10px}
}

/* Hero */
.hero{background:linear-gradient(120deg, rgba(58,161,255,.15), rgba(99,226,183,.15));padding:96px 0 72px;border-bottom:1px solid rgba(255,255,255,.08)}
.hero-inner{display:flex;flex-direction:column;gap:18px;align-items:flex-start}
.hero h1{font-size:36px;line-height:1.2;margin:0}
.hero p{color:var(--muted);margin:0 0 8px}

/* Common sections */
.section{padding:64px 0}
.section.alt{background:rgba(255,255,255,.03)}

/* Cards & in-view animation */
.cards{display:grid;grid-template-columns:1fr;gap:16px}
@media(min-width:700px){.cards{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.cards{grid-template-columns:repeat(4,1fr)}}
.card{background:var(--panel);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:18px;transform:translateY(10px);opacity:.0;transition:opacity .35s ease, transform .35s ease}
.card.in-view{transform:translateY(0);opacity:1}

/* Rules list */
.rules{margin:0;padding-left:18px;color:var(--muted)}

/* Buttons */
.btn{display:inline-block;padding:12px 16px;border-radius:10px;border:1px solid rgba(255,255,255,.12)}
.btn.primary{background:var(--primary);color:#00112a;border:none}
.btn.secondary{background:transparent;color:#fff}

/* Footer */
.site-footer{border-top:1px solid rgba(255,255,255,.08);padding:24px 0;color:var(--muted);text-align:center}