:root {
  --bg: #0a0d14;
  --text: #e8edf4;
  --muted: #8b95a7;
  --accent: #3a8dff;
  --accent-2: #7c4dff;
  --card: rgba(255, 255, 255, 0.055);
  --border: rgba(255, 255, 255, 0.1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
}

/* 背景光斑 */
.orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  pointer-events: none;
  z-index: 0;
}
.orb-1 { width: 520px; height: 520px; background: #123a75; top: -140px; left: -120px; }
.orb-2 { width: 420px; height: 420px; background: #3a2a75; top: 30%; right: -160px; }
.orb-3 { width: 380px; height: 380px; background: #0f5fb8; bottom: -120px; left: 30%; opacity: 0.35; }

/* 玻璃卡片 */
.glass {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.nav {
  position: sticky;
  top: 12px;
  margin: 12px auto 0;
  width: min(960px, calc(100% - 32px));
  z-index: 10;
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 18px;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
.logo svg { border-radius: 7px; }
.links { display: flex; gap: 20px; }
.links a { color: var(--muted); text-decoration: none; font-size: 14px; transition: color .2s; }
.links a:hover { color: var(--text); }

main { position: relative; z-index: 1; }

.hero {
  text-align: center;
  padding: 96px 20px 60px;
}
.hero-badge {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 20px;
}
h1 { font-size: 52px; margin: 0 0 12px; letter-spacing: 1px; }
h1 span {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.subtitle { font-size: 17px; color: var(--muted); margin: 0 0 32px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 13px 34px;
  border-radius: 14px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: transform .15s, box-shadow .2s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary {
  background: linear-gradient(120deg, var(--accent), #1e6fe0);
  color: #fff;
  box-shadow: 0 8px 30px rgba(58, 141, 255, .35);
}
.btn.ghost { border: 1px solid var(--border); color: var(--text); background: var(--card); }
.hint { color: var(--muted); font-size: 13px; margin-top: 18px; }

.announcements {
  margin: 32px auto 0;
  max-width: 640px;
  text-align: left;
  padding: 14px 20px;
}
.announcements .item { border-bottom: 1px solid var(--border); padding: 8px 0; }
.announcements .item:last-child { border-bottom: none; }
.announcements .item b { font-size: 14px; }
.announcements .item p { margin: 4px 0 0; color: var(--muted); font-size: 13px; }

.section-title { text-align: center; font-size: 28px; margin: 0 0 36px; }

.features { padding: 40px 20px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 18px;
  max-width: 960px;
  margin: 0 auto;
}
.card { padding: 26px; }
.card .icon { font-size: 30px; }
.card h3 { margin: 14px 0 8px; font-size: 17px; }
.card p { color: var(--muted); font-size: 14px; margin: 0; }

.guide { padding: 40px 20px; }
.steps {
  max-width: 640px;
  margin: 0 auto;
  padding: 28px 30px;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.step { display: flex; gap: 16px; }
.num {
  flex-shrink: 0;
  width: 34px; height: 34px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  font-weight: 700; font-size: 15px;
}
.step h3 { margin: 0 0 4px; font-size: 15px; }
.step p { margin: 0; color: var(--muted); font-size: 13.5px; }

.faq { padding: 40px 20px; }
.faq-list { max-width: 640px; margin: 0 auto; padding: 8px 24px; }
details { border-bottom: 1px solid var(--border); padding: 14px 0; }
details:last-child { border-bottom: none; }
summary { cursor: pointer; font-weight: 600; font-size: 15px; }
details p { color: var(--muted); font-size: 14px; margin: 10px 0 4px; }

.changelog { padding: 40px 20px 70px; }
.log-list { max-width: 640px; margin: 0 auto; padding: 20px 26px; }
.log-item { border-bottom: 1px solid var(--border); padding: 12px 0; }
.log-item:last-child { border-bottom: none; }
.log-item h3 { margin: 0 0 6px; font-size: 15px; color: var(--accent); }
.log-item p { margin: 0; color: var(--muted); font-size: 14px; }

.footer { text-align: center; padding: 30px 20px 44px; color: var(--muted); font-size: 13px; }
.footer a { color: var(--muted); }

@media (max-width: 640px) {
  h1 { font-size: 36px; }
  .hero { padding: 72px 16px 44px; }
  .links { display: none; }
}