:root {
  --bg: #0a0a0e;
  --surface: #15151b;
  --surface-high: #22222b;
  --hairline: rgba(255, 255, 255, 0.08);
  --text: rgba(255, 255, 255, 0.94);
  --dim: rgba(255, 255, 255, 0.6);
  --accent: #8e7cff;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* Language switch: html[data-lang] shows one language; without JS both show. */
html[data-lang="zh"] [lang="en"]:not(html),
html[data-lang="en"] [lang="zh"]:not(html) { display: none !important; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }

header.top {
  position: sticky; top: 0; z-index: 2;
  background: rgba(10, 10, 14, 0.82);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
  border-bottom: 1px solid var(--hairline);
}
header.top .wrap { display: flex; align-items: center; gap: 12px; height: 56px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
nav { margin-left: auto; display: flex; gap: 16px; font-size: 15px; }
nav a { color: var(--dim); }
nav a[aria-current="page"] { color: var(--text); }
.lang { display: flex; border: 1px solid var(--hairline); border-radius: 999px; overflow: hidden; }
.lang button {
  font: inherit; font-size: 13px; color: var(--dim); background: none; border: 0;
  padding: 3px 10px; cursor: pointer;
}
html[data-lang="zh"] .lang [data-set-lang="zh"],
html[data-lang="en"] .lang [data-set-lang="en"] { background: var(--surface-high); color: var(--text); }

main { padding: 40px 0 64px; }
h1 { font-size: 32px; line-height: 1.25; margin: 0 0 8px; letter-spacing: -0.01em; }
h2 { font-size: 21px; margin: 40px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p, li { color: var(--dim); }
strong { color: var(--text); font-weight: 600; }
.meta { color: var(--dim); font-size: 14px; margin-bottom: 24px; }

.hero { text-align: center; padding: 32px 0 8px; }
.hero img.icon { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 16px 48px rgba(142, 124, 255, 0.28); }
.hero h1 { font-size: 40px; margin-top: 20px; }
.hero p.lead { font-size: 19px; margin: 6px 0 24px; }
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 999px;
  background: linear-gradient(180deg, #a897ff, #6b55f2); color: #fff; font-weight: 600;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }

.shot { display: block; width: min(320px, 80%); margin: 40px auto 0; border-radius: 36px; border: 1px solid var(--hairline); }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; margin-top: 40px; }
.card {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: 18px; padding: 18px 18px 14px;
}
.card h3 { margin: 0 0 4px; }
.card p { margin: 0; font-size: 15px; }

.faq details {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: 14px;
  padding: 14px 16px; margin: 10px 0;
}
.faq summary { cursor: pointer; font-weight: 600; color: var(--text); }
.faq details p, .faq details ol, .faq details ul { margin: 10px 0 2px; }

.contact {
  background: var(--surface); border: 1px solid var(--hairline); border-radius: 18px; padding: 20px; margin-top: 24px;
}
.contact a { font-size: 18px; font-weight: 600; word-break: break-all; }

footer { border-top: 1px solid var(--hairline); padding: 24px 0 40px; font-size: 14px; color: var(--dim); }
footer .wrap { display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer a { color: var(--dim); }

@media (max-width: 560px) {
  nav { gap: 12px; font-size: 14px; }
  .brand span { display: none; }
  h1 { font-size: 27px; }
  .hero h1 { font-size: 32px; }
}