/* DemanOne — shared styles (Deman electric dark theme) */
:root{
  --bg:#0a0b0f; --surface:#14161d; --surface2:#1b1e27;
  --line:#262a36; --line2:#323849;
  --txt:#e8eaf0; --muted:#9aa0b0; --faint:#6b7280;
  --acc:#a855f7; --acc2:#7c3aed; --acc-soft:rgba(168,85,247,.14);
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:-apple-system,"Segoe UI",Roboto,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--txt);line-height:1.7;background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:var(--acc);text-decoration:none}
a:hover{color:var(--acc2)}
.wrap{max-width:1040px;margin:0 auto;padding:0 22px}

/* nav */
header.nav{position:sticky;top:0;z-index:20;background:rgba(10,11,15,.82);
  backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.brand{font-weight:800;font-size:21px;letter-spacing:.5px;
  background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.brand span{color:var(--muted);font-weight:400;font-size:13px;margin-left:7px;
  -webkit-text-fill-color:var(--muted)}
.brand a{background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent;font-weight:800}
nav.links a{margin-left:24px;color:var(--muted);font-size:15px;transition:color .15s}
nav.links a:hover{color:var(--txt)}
.langsw{display:inline-flex;margin-left:24px;border:1px solid var(--line2);border-radius:8px;overflow:hidden}
.langsw a{padding:5px 12px;font-size:13px;color:var(--muted);font-weight:600;transition:all .15s}
.langsw a.on{background:linear-gradient(90deg,var(--acc),var(--acc2));color:#fff}
.langsw a:hover:not(.on){color:var(--txt);background:var(--surface2)}
/* language visibility */
.lang-en .zh{display:none}
.lang-zh .en{display:none}

/* hero */
.hero{position:relative;overflow:hidden;padding:96px 0 88px;
  background:radial-gradient(900px 420px at 78% -10%,rgba(168,85,247,.22),transparent 60%),
    radial-gradient(700px 380px at 8% 120%,rgba(124,58,237,.14),transparent 55%),
    linear-gradient(180deg,#0d0f15 0%,#0a0b0f 100%)}
.hero .wrap{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.hero-copy{min-width:0}
.hero-art{position:relative}
.hero-art img{width:100%;border-radius:16px;display:block;
  filter:drop-shadow(0 20px 50px rgba(168,85,247,.25))}
.hero h1{font-size:46px;line-height:1.12;margin-bottom:16px;letter-spacing:-.5px;font-weight:800}
.hero h1 em{font-style:normal;background:linear-gradient(90deg,var(--acc),var(--acc2));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero p{font-size:18px;color:var(--muted);max-width:660px}
.hero .cn{font-size:15px;color:var(--faint);margin-top:8px}
.btns{margin-top:32px}
.btn{display:inline-block;background:linear-gradient(90deg,var(--acc),var(--acc2));color:#fff;
  font-weight:700;padding:13px 28px;border-radius:10px;margin-right:14px;
  box-shadow:0 8px 24px rgba(168,85,247,.28);transition:transform .15s,box-shadow .15s}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 30px rgba(168,85,247,.4);color:#fff}
.btn.alt{background:transparent;color:var(--txt);border:1.5px solid var(--line2);box-shadow:none}
.btn.alt:hover{border-color:var(--acc);color:var(--acc)}

/* sections */
section{padding:64px 0}
section h2{font-size:30px;margin-bottom:6px;letter-spacing:-.3px;font-weight:800}
section .sub{color:var(--faint);margin-bottom:34px;font-size:15px}
.alt-bg{background:linear-gradient(180deg,#0d0f15,#101219)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
@media(max-width:640px){.grid-2{grid-template-columns:1fr}}
.card{border:1px solid var(--line);border-radius:16px;padding:26px;background:var(--surface);
  display:flex;flex-direction:column;transition:border-color .2s,transform .2s,box-shadow .2s}
.card:hover{border-color:var(--line2);transform:translateY(-3px);
  box-shadow:0 14px 40px rgba(0,0,0,.45)}
.card h3{color:var(--txt);font-size:18px;margin-bottom:10px;font-weight:700}
.card p{color:var(--muted);font-size:15px}
.card .cn{color:var(--faint);font-size:14px}
.card .price{font-weight:800;color:var(--acc);padding-top:16px;font-size:16px}
.link-card{cursor:pointer}
.link-card .join{margin-top:auto;padding-top:14px;font-size:13px;font-weight:600;color:var(--acc);opacity:.85;transition:opacity .15s,transform .15s;display:inline-block}
.link-card:hover{border-color:var(--acc)}
.link-card:hover .join{opacity:1;transform:translateX(3px)}
.tag{display:inline-block;align-self:flex-start;font-size:11px;font-weight:700;letter-spacing:.5px;
  text-transform:uppercase;color:var(--acc);background:var(--acc-soft);
  border:1px solid rgba(168,85,247,.3);border-radius:6px;padding:3px 9px;margin-bottom:12px}
.card.biz{padding:0;overflow:hidden}
.card.biz .biz-img{width:100%;height:140px;object-fit:cover;display:block;
  border-bottom:1px solid var(--line)}
.card.biz h3{padding:18px 22px 0}
.card.biz p{padding:6px 22px}
.card.biz p:last-child{padding-bottom:22px}
.stats{display:flex;gap:48px;flex-wrap:wrap;margin-top:24px}
.stat b{display:block;font-size:38px;font-weight:800;
  background:linear-gradient(90deg,var(--acc),var(--acc2));-webkit-background-clip:text;
  background-clip:text;-webkit-text-fill-color:transparent}
.stat span{color:var(--faint);font-size:14px}

/* legal pages */
.legal{padding:56px 0;max-width:880px}
.legal h1{font-size:32px;margin-bottom:6px;font-weight:800}
.legal h2{font-size:20px;margin-top:34px;border-left:3px solid var(--acc);
  padding:2px 0 2px 14px;color:var(--txt)}
.legal .sub{color:var(--faint);margin-top:0}
.legal p,.legal li{color:var(--muted)}
.legal .note{font-size:13px;color:var(--faint)}
.legal .cn{color:var(--muted)}
.legal ul{padding-left:22px}
.legal a{color:var(--acc)}
.age{background:var(--acc-soft);border:1px solid rgba(168,85,247,.35);border-radius:12px;
  padding:16px 20px;margin:20px 0;color:var(--txt)}
table{width:100%;border-collapse:collapse;margin:18px 0}
th,td{border:1px solid var(--line);padding:11px 14px;text-align:left;font-size:15px;color:var(--muted)}
th{background:var(--surface2);color:var(--txt)}

/* footer */
footer.ft{background:#070809;color:var(--muted);padding:48px 0;font-size:14px;
  margin-top:48px;border-top:1px solid var(--line)}
footer.ft .cols{display:flex;justify-content:space-between;flex-wrap:wrap;gap:28px}
footer.ft a{color:var(--muted)}
footer.ft a:hover{color:var(--acc)}
footer.ft .legal-links a{display:block;margin:0 0 8px}
footer.ft .cn{color:var(--faint)}
.copy{border-top:1px solid var(--line);margin-top:30px;padding-top:20px;color:var(--faint)}
@media(max-width:760px){.hero .wrap{grid-template-columns:1fr;gap:28px}
  .hero-art{order:-1}}
@media(max-width:640px){nav.links a{margin-left:14px;font-size:14px}
  .hero{padding:64px 0 56px}.hero h1{font-size:34px}.stats{gap:28px}}