:root {
  --ink: #16302c;
  --muted: #4d6762;
  --line: #d7e4e0;
  --bg: #f4f8f6;
  --card: #ffffff;
  --accent: #0f7a68;
  --accent-ink: #ffffff;
  --shadow: 0 16px 40px rgba(15, 46, 40, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  line-height: 1.65;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 32px;
  flex: 1;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 36px;
}

.brand img {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: #fff;
  box-shadow: var(--shadow);
}

.brand h1 {
  margin: 0;
  font-size: 22px;
  letter-spacing: 0.02em;
}

.brand p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px 28px 24px;
  box-shadow: var(--shadow);
}

.card h2 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1.3;
}

.card .lead {
  margin: 0 0 16px;
  font-size: 16px;
}

.card ul {
  margin: 0 0 18px;
  padding-left: 1.15em;
  color: var(--ink);
}

.card li { margin: 0.25em 0; }

.note {
  background: #eef6f3;
  border-radius: 12px;
  padding: 12px 14px;
  color: var(--ink);
  font-size: 14px;
}

.downloads {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 22px 0 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
}

.btn-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.btn-secondary {
  background: #fff;
  color: var(--ink);
  border: 1px solid var(--line);
}

.disclaimer {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 13px;
}

footer {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto 28px;
  color: var(--muted);
  font-size: 12px;
  text-align: center;
}

footer a {
  color: var(--muted);
  text-decoration: none;
}

footer a:hover { text-decoration: underline; }

.footer-brand { margin-bottom: 8px; }
.footer-brand a { color: var(--ink); }

.icp, .beian {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin: 2px 8px;
}

.beian img { display: block; }

@media (max-width: 640px) {
  .page { padding-top: 28px; }
  .card { padding: 22px 18px; }
  .card h2 { font-size: 22px; }
  .downloads { flex-direction: column; }
  .btn { width: 100%; }
}