:root {
  --bg: #0a0e1a;
  --panel: #141d2e;
  --panel2: #1c283b;
  --text: #e8edf7;
  --muted: #aab5c8;
  --line: #30415d;
  --accent: #4f7cff;
  --green: #56d7a4;
  --amber: #f4c26b;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: linear-gradient(145deg, #09101e, #0a0e1a 42%, #101b31);
  background-attachment: fixed;
  color: var(--text);
  font-family: "Segoe UI", "Microsoft YaHei", -apple-system, sans-serif;
  line-height: 1.65;
}

a { color: #9fbaff; }

.shell { max-width: 1160px; margin: auto; padding: 24px; }

/* ---------- header ---------- */
.site-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.brand {
  font-size: 19px;
  font-weight: 600;
  text-decoration: none;
  color: var(--text);
  letter-spacing: .2px;
}
.brand span { color: var(--accent); }
.site-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.site-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 7px 11px;
  border-radius: 9px;
  font-size: 15px;
}
.site-nav a:hover { color: #fff; background: var(--panel2); }
.site-nav a.active { color: #fff; background: var(--panel2); }
.lang button {
  border: 1px solid var(--line);
  background: #111a2a;
  color: var(--text);
  border-radius: 9px;
  padding: 6px 10px;
  cursor: pointer;
  font-size: 13px;
}
.lang button.active { background: var(--accent); border-color: var(--accent); }

/* ---------- hero ---------- */
.hero {
  margin-top: 26px;
  padding: 46px 38px;
  border: 1px solid #334463;
  border-radius: 20px;
  background: linear-gradient(120deg, #172847cc, #121b2fcc);
}
.hero h1 { font-size: 38px; margin: 0 0 12px; line-height: 1.25; }
.hero .sub { color: var(--muted); font-size: 17px; margin: 0 0 22px; max-width: 720px; }

.btn {
  display: inline-block;
  border-radius: 10px;
  padding: 11px 20px;
  text-decoration: none;
  font-size: 15px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  margin-right: 10px;
  margin-bottom: 8px;
}
.btn.ghost { background: transparent; color: #cfe0ff; border-color: var(--line); }
.btn:hover { filter: brightness(1.1); }

/* ---------- layout ---------- */
.grid { display: grid; gap: 18px; margin-top: 26px; }
.grid.c3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.c2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.card {
  border: 1px solid var(--line);
  border-radius: 15px;
  background: linear-gradient(145deg, #172235, #121a29);
  padding: 22px;
}
.card h2 { margin: 0 0 10px; font-size: 22px; }
.card h3 { margin: 0 0 8px; font-size: 17px; color: #dce7ff; }
.card p { margin: 7px 0; color: #d8dfec; }

section { margin-top: 34px; }
section > h2 { font-size: 25px; margin: 0 0 6px; }
section > .lead { color: var(--muted); margin: 0 0 14px; }

.tag {
  display: inline-block;
  color: #bcd0ff;
  background: #20365e;
  border: 1px solid #345997;
  border-radius: 99px;
  padding: 2px 10px;
  font-size: 12px;
  margin: 0 5px 5px 0;
}
.tag.soon { color: var(--amber); background: #3a2f16; border-color: #7a6330; }
.tag.live { color: var(--green); background: #143528; border-color: #2c6b52; }

ul, ol { margin: 8px 0; padding-left: 22px; }
li { margin: 5px 0; color: #d8dfec; }

table { width: 100%; border-collapse: collapse; margin-top: 12px; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid var(--line); }
th { color: #bcd0ff; font-weight: 600; }

code {
  background: #0b1321;
  border: 1px solid #263854;
  border-radius: 5px;
  padding: 1px 6px;
  color: #c8d9ff;
  font-size: .92em;
}
pre {
  background: #0b1321;
  border: 1px solid #263854;
  border-radius: 10px;
  padding: 14px 16px;
  overflow-x: auto;
}
pre code { background: none; border: none; padding: 0; }

.site-foot {
  margin-top: 46px;
  padding: 22px 0 10px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}
.site-foot a { color: var(--muted); text-decoration: none; margin-right: 14px; }
.site-foot a:hover { color: #fff; }

body:not(.lang-en) .en, body.lang-en .zh { display: none; }

@media (max-width: 860px) {
  .grid.c3, .grid.c2 { grid-template-columns: 1fr; }
  .hero { padding: 30px 22px; }
  .hero h1 { font-size: 28px; }
  .shell { padding: 14px; }
}