:root {
  color-scheme: dark;
  --bg: #070b16;
  --bg-2: #0e1424;
  --card: #161d2f;
  --line: rgba(255,255,255,.08);
  --text: #eef2f8;
  --muted: #8b97ad;
  --coral: #ff5a36;
  --peach: #ffb08a;
  --teal: #61dbcc;
  --gold: #f6c766;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Apple SD Gothic Neo", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}
a { color: var(--teal); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { width: min(1080px, calc(100% - 40px)); margin: 0 auto; }

.top {
  position: sticky; top: 0; z-index: 20;
  background: rgba(7,11,22,.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.top-inner { display: flex; align-items: center; gap: 18px; min-height: 64px; flex-wrap: wrap; }
.logo { font-weight: 800; font-size: 18px; color: #fff; letter-spacing: -.03em; text-decoration: none; }
.logo:hover { text-decoration: none; }
.logo b { color: var(--coral); font-weight: 800; }
.menu { margin-left: auto; display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.menu a { color: var(--muted); font-size: 14px; font-weight: 650; }
.menu a.is-on { color: #fff; }
.langs { display: flex; gap: 6px; }
.langs button {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  border-radius: 999px;
  padding: 4px 10px;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}
.langs button[aria-pressed="true"] {
  background: var(--coral);
  border-color: transparent;
  color: #fff;
}

[data-lang] { display: none; }
html[data-locale="zh"] [data-lang="zh"],
html[data-locale="en"] [data-lang="en"],
html[data-locale="ko"] [data-lang="ko"] { display: block; }
html[data-locale="zh"] a [data-lang="zh"],
html[data-locale="en"] a [data-lang="en"],
html[data-locale="ko"] a [data-lang="ko"] { display: inline; }

.foot {
  border-top: 1px solid var(--line);
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 13px;
}

/* Home */
.home-hero {
  padding: 72px 0 36px;
  background:
    radial-gradient(900px 380px at 0% 0%, rgba(255,90,54,.22), transparent 55%),
    radial-gradient(700px 320px at 100% 10%, rgba(97,219,204,.14), transparent 50%);
}
.home-hero .kicker { color: var(--teal); font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase; }
.home-hero h1 { font-size: clamp(36px, 6vw, 58px); line-height: 1.05; letter-spacing: -.04em; margin: 10px 0 14px; max-width: 16ch; }
.home-hero .lede { max-width: 560px; color: var(--muted); font-size: 18px; }
.home-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 24px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 12px 18px; border-radius: 14px; font-weight: 750; text-decoration: none !important;
}
.btn-main { background: linear-gradient(135deg, var(--coral), var(--peach)); color: #fff !important; }
.btn-ghost { border: 1px solid var(--line); color: #fff !important; background: rgba(255,255,255,.04); }
.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; padding: 10px 0 72px; }
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
  min-height: 160px;
}
.feature .mark {
  width: 38px; height: 38px; border-radius: 12px;
  display: grid; place-items: center; font-weight: 800; margin-bottom: 12px;
}
.feature h2 { margin: 0 0 8px; font-size: 20px; }
.feature p { margin: 0; color: var(--muted); }

/* Support */
.help-shell { display: grid; grid-template-columns: 320px 1fr; gap: 22px; padding: 36px 0 72px; align-items: start; }
.help-aside {
  position: sticky; top: 84px;
  background: linear-gradient(180deg, #1a2238, #141b2d);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 22px;
}
.help-aside h1 { margin: 6px 0 8px; font-size: 28px; letter-spacing: -.03em; }
.help-aside p { color: var(--muted); }
.mail-box {
  margin-top: 16px;
  background: rgba(97,219,204,.08);
  border: 1px solid rgba(97,219,204,.2);
  border-radius: 16px;
  padding: 14px;
}
.mail-box a { font-weight: 800; font-size: 15px; word-break: break-all; }
.help-main h2 { margin: 0 0 12px; font-size: 22px; }
.help-block { margin-bottom: 28px; }
.ticket {
  display: grid; grid-template-columns: 42px 1fr; gap: 12px;
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  padding: 14px; margin: 0 0 10px;
}
.ticket b {
  width: 42px; height: 42px; border-radius: 12px;
  display: grid; place-items: center;
  background: rgba(255,90,54,.14); color: var(--peach);
}
.ticket p { margin: 0; color: var(--muted); }
.ticket strong { color: #fff; }
details.faq {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px 14px;
  margin: 0 0 8px;
}
details.faq summary { cursor: pointer; font-weight: 700; }
details.faq p { color: var(--muted); margin: 8px 0 0; }

/* Privacy */
.doc { width: min(760px, calc(100% - 40px)); margin: 0 auto; padding: 40px 0 72px; }
.doc h1 { font-size: clamp(28px, 4vw, 40px); letter-spacing: -.03em; margin: 8px 0 10px; }
.doc-card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 8px 26px 28px;
}
.doc-card h2 { font-size: 18px; margin: 26px 0 8px; }
.doc-card p, .doc-card li { color: #c4cee0; }

@media (max-width: 860px) {
  .features, .help-shell { grid-template-columns: 1fr; }
  .help-aside { position: static; }
  .home-hero { padding-top: 40px; }
}