:root {
  --bg: #0e0e14;
  --card: #181822;
  --text: #f4f4f7;
  --muted: #9aa0ae;
  --line: #2a2a36;
  --cyan: #25f4ee;
  --magenta: #ff2d6a;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background:
    radial-gradient(900px 420px at 10% -10%, rgba(37, 244, 238, 0.16), transparent 55%),
    radial-gradient(800px 400px at 100% 0%, rgba(255, 45, 106, 0.16), transparent 50%),
    var(--bg);
}

a { color: #7dffe8; }
a:hover { color: var(--cyan); }

.site-nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 20px;
  max-width: 960px;
  margin: 0 auto;
  padding: 16px 20px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
}

.brand-mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: #14141c;
  border: 1px solid rgba(255, 255, 255, 0.42);
  display: grid;
  place-items: center;
}

.brand-mark svg { display: block; }

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
}

.nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}

.wrap {
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 20px 56px;
}

.hero {
  text-align: center;
  padding: 28px 0 12px;
}

.mark {
  width: 72px;
  height: 72px;
  margin: 0 auto 18px;
  border-radius: 20px;
  background: #14141c;
  border: 1px solid rgba(255, 255, 255, 0.42);
  box-shadow:
    0 0 0 1px rgba(37, 244, 238, 0.28),
    0 0 18px rgba(37, 244, 238, 0.22),
    0 0 28px rgba(255, 45, 106, 0.16);
  display: grid;
  place-items: center;
}

.mark svg { display: block; }

h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 6vw, 40px);
  letter-spacing: 0.02em;
}

h2 {
  margin: 0 0 14px;
  font-size: 18px;
}

h3 {
  margin: 0 0 8px;
  font-size: 16px;
}

.lead {
  margin: 0 auto 28px;
  max-width: 36em;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.btn {
  display: inline-block;
  padding: 14px 28px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  color: #081014;
  background: linear-gradient(120deg, var(--cyan), #7dffe8 40%, var(--magenta));
}

.btn:hover { color: #081014; }

.req {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.qr-box {
  margin: 28px auto 0;
  max-width: 240px;
}

.qr-box h2 {
  margin-bottom: 10px;
  font-size: 16px;
}

.qr-frame {
  display: inline-block;
  padding: 12px;
  background: #fff;
  border-radius: 12px;
}

.qr-frame img {
  display: block;
  width: 180px;
  height: 180px;
}

.qr-hint {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

section.card,
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px 22px 12px;
  margin-top: 20px;
}

.prose p,
.card p {
  color: #d7d9e2;
  line-height: 1.75;
  margin: 0 0 12px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 0 0 8px;
}

.feature {
  background: #12121a;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 16px;
}

.feature p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

ol, ul {
  margin: 0 0 16px;
  padding-left: 1.2em;
  color: #d7d9e2;
  line-height: 1.75;
}

li { margin-bottom: 8px; }

.info-list {
  list-style: none;
  padding: 0;
}

.info-list li {
  margin-bottom: 12px;
}

.site-footer {
  margin-top: 36px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
  line-height: 1.7;
  text-align: center;
}

.site-footer a {
  color: var(--muted);
  text-decoration: underline;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 16px;
  margin-bottom: 12px;
}

.site-footer nav a { text-decoration: none; }

.beian { margin: 12px 0 0; }