:root{
  --bg:#0b1020; --bg2:#0e1430; --ink:#e7ecff; --muted:#9aa4c7;
  --cyan:#22d3ee; --violet:#a78bfa; --pink:#f472b6;
  --card:rgba(255,255,255,0.05); --card-b:rgba(255,255,255,0.10);
  --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.7;overflow-x:hidden}
.container{max-width:1120px;margin:0 auto;padding:0 24px}
a{color:inherit;text-decoration:none}
h1,h2,h3{margin:0 0 12px;font-weight:700}
p{margin:0 0 12px;color:var(--muted)}

/* animated aurora background */
.aurora{position:fixed;inset:0;z-index:-1;overflow:hidden;background:var(--bg)}
.aurora span{position:absolute;border-radius:50%;filter:blur(70px);opacity:.35;animation:float 18s ease-in-out infinite}
.aurora span:nth-child(1){width:520px;height:520px;background:var(--cyan);top:-140px;left:-120px;animation-duration:22s}
.aurora span:nth-child(2){width:460px;height:460px;background:var(--violet);top:20%;right:-140px;animation-duration:26s;animation-delay:-6s}
.aurora span:nth-child(3){width:380px;height:380px;background:var(--pink);bottom:-160px;left:30%;animation-duration:20s;animation-delay:-3s}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}50%{transform:translate(40px,-30px) scale(1.15)}}

/* nav */
.site-nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(11,16,32,.65);border-bottom:1px solid var(--card-b)}
.nav-inner{max-width:1120px;margin:0 auto;padding:14px 24px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px}
.brand svg{width:26px;height:26px}
.brand-en{color:var(--muted);font-weight:500;font-size:12px;margin-left:2px}
.nav-links{display:flex;gap:26px}
.nav-links a{color:var(--muted);font-size:14px;transition:.2s}
.nav-links a:hover{color:var(--cyan)}
.nav-actions{display:flex;align-items:center;gap:10px}
.burger{display:none;flex-direction:column;gap:4px;cursor:pointer}
.burger span{width:22px;height:2px;background:var(--ink)}
#nav-toggle,.mobile-menu{display:none}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;border-radius:999px;font-size:14px;font-weight:600;transition:.25s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:linear-gradient(135deg,var(--cyan),var(--violet));color:#0b1020}
.btn-primary:hover{filter:brightness(1.1);transform:translateY(-1px)}
.btn-ghost{border-color:var(--card-b);color:var(--ink)}
.btn-ghost:hover{background:var(--card)}
.btn-block{width:100%}

/* hero */
.hero{padding:120px 0 80px;text-align:center}
.promo-tag{display:inline-block;padding:6px 16px;border-radius:999px;background:var(--card);border:1px solid var(--card-b);font-size:13px;color:var(--cyan);margin-bottom:22px}
.hero h1{font-size:44px;line-height:1.3;max-width:760px;margin:0 auto 18px}
.hero h1 span{background:linear-gradient(135deg,var(--cyan),var(--violet));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{max-width:560px;margin:0 auto 30px}
.hero-ctas{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}

section{padding:70px 0}
.section-head{text-align:center;max-width:560px;margin:0 auto 44px}
.eyebrow{display:inline-block;font-size:12px;letter-spacing:.14em;color:var(--cyan);margin-bottom:8px}

.adv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.adv-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:26px;transition:.25s}
.adv-card:hover{transform:translateY(-4px);border-color:var(--cyan)}
.adv-card .icon{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,var(--cyan),var(--violet));display:flex;align-items:center;justify-content:center;margin-bottom:14px;color:#0b1020}

.stream-row{margin-top:32px;background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:20px 24px;display:flex;flex-wrap:wrap;gap:14px;align-items:center;justify-content:space-between}
.pill-list{display:flex;flex-wrap:wrap;gap:8px}
.pill{padding:6px 14px;border-radius:999px;background:rgba(34,211,238,.12);color:var(--cyan);font-size:13px}

.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.price-card{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:28px;position:relative}
.price-card.recommend{border-color:var(--cyan);box-shadow:0 0 0 1px var(--cyan),0 20px 50px -20px rgba(34,211,238,.4)}
.badge{position:absolute;top:-12px;right:20px;background:linear-gradient(135deg,var(--cyan),var(--violet));color:#0b1020;font-size:12px;font-weight:700;padding:4px 12px;border-radius:999px}
.cap{color:var(--muted);font-size:13px;margin-bottom:16px}
.price-table{width:100%;border-collapse:collapse;margin-bottom:18px}
.price-table td{padding:8px 0;border-bottom:1px dashed var(--card-b);font-size:14px}
.price-table .period{color:var(--muted)}
.price-table .now{font-size:18px;font-weight:800;color:var(--ink)}
.price-note{font-size:12px;color:var(--muted);text-align:center;margin-top:-6px}

.why-row{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;margin-bottom:56px}
.why-row:nth-child(even) .why-visual{order:-1}
.why-visual{background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:24px;min-height:200px}
.data-panel{display:flex;gap:10px;align-items:flex-end;height:140px}
.data-panel i{flex:1;background:linear-gradient(180deg,var(--cyan),var(--violet));border-radius:6px 6px 0 0;animation:grow 3s ease-in-out infinite alternate}
.data-panel i:nth-child(2){animation-delay:.3s}
.data-panel i:nth-child(3){animation-delay:.6s}
.data-panel i:nth-child(4){animation-delay:.9s}
.data-panel i:nth-child(5){animation-delay:1.2s}
@keyframes grow{from{height:30%}to{height:95%}}
.terminal{background:#050810;border-radius:10px;padding:18px;font-family:Menlo,Consolas,monospace;font-size:13px;color:#7ee787}
.terminal .l1{color:var(--muted)}
.terminal .cursor{display:inline-block;width:8px;height:14px;background:var(--cyan);animation:blink 1s step-end infinite;vertical-align:middle}
@keyframes blink{50%{opacity:0}}

.cta-band{text-align:center;background:linear-gradient(135deg,rgba(34,211,238,.12),rgba(167,139,250,.12));border-radius:24px;padding:60px 24px;margin:0 24px}

.marquee{overflow:hidden;position:relative;mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:20px;width:max-content;animation:scroll 32s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
@keyframes scroll{from{transform:translateX(0)}to{transform:translateX(-50%)}}
.t-card{width:280px;flex:0 0 auto;background:var(--card);border:1px solid var(--card-b);border-radius:var(--radius);padding:20px}
.stars{color:#fbbf24;margin-bottom:8px;font-size:14px}
.t-name{font-weight:700;font-size:13px;color:var(--ink);margin-top:10px}

.faq-list{max-width:720px;margin:0 auto}
.faq-item{border-bottom:1px solid var(--card-b);padding:16px 0}
.faq-item summary{cursor:pointer;font-weight:600;list-style:none;display:flex;justify-content:space-between;align-items:center}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:20px;color:var(--cyan);transition:.2s}
.faq-item[open] summary::after{content:"−"}
.faq-item p{margin-top:10px}

footer{border-top:1px solid var(--card-b);padding:50px 0 26px;margin-top:40px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer-col h4{font-size:14px;margin-bottom:14px}
.footer-col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:8px}
.footer-col ul a{color:var(--muted);font-size:13px}
.footer-col ul a:hover{color:var(--cyan)}
.footer-seo{font-size:12px;color:var(--muted);max-width:900px;line-height:1.8}
.friend-links{display:flex;flex-wrap:wrap;gap:10px;margin:18px 0;font-size:12px}
.friend-links .label{color:var(--muted)}
.friend-links a{color:var(--muted);padding:3px 10px;border:1px solid var(--card-b);border-radius:999px}
.friend-links a:hover{color:var(--cyan);border-color:var(--cyan)}
.copyright{font-size:12px;color:var(--muted)}

@media (max-width:860px){
  .adv-grid,.pricing-grid{grid-template-columns:1fr}
  .why-row{grid-template-columns:1fr}
  .why-row:nth-child(even) .why-visual{order:0}
  .footer-grid{grid-template-columns:1fr}
  .nav-links{display:none}
  .burger{display:flex}
  .nav-actions .btn-ghost{display:none}
  #nav-toggle:checked ~ .mobile-menu{display:flex}
  .mobile-menu{display:none;position:absolute;top:100%;left:0;right:0;background:#0e1430;flex-direction:column;padding:20px 24px;gap:14px;border-bottom:1px solid var(--card-b)}
  .hero h1{font-size:30px}
  .cta-band{margin:0 16px}
}