:root {
  --fg: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0a84ff;
  --bg: #ffffff;
  --card: #f5f5f7;
  --line: #e5e5ea;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #f5f5f7;
    --muted: #a1a1a6;
    --bg: #000000;
    --card: #1c1c1e;
    --line: #2c2c2e;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
    "Segoe UI", "Microsoft YaHei", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.7;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header, main, footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}

.brand { font-weight: 600; color: var(--fg); }
nav a { margin-left: 20px; color: var(--muted); }

.hero { text-align: center; padding: 56px 0 32px; }
.hero h1 { font-size: 44px; line-height: 1.2; margin: 0 0 12px; }
.hero p { font-size: 19px; color: var(--muted); margin: 0 0 28px; }

.button {
  display: inline-block;
  padding: 12px 26px;
  border-radius: 980px;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}
.button:hover { text-decoration: none; opacity: 0.9; }
.button.secondary { background: var(--card); color: var(--muted); cursor: default; }

.downloads { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
  margin: 40px 0;
}
.card { background: var(--card); border-radius: 16px; padding: 20px; }
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }

article h1 { font-size: 32px; margin: 24px 0 4px; }
article h2 { font-size: 21px; margin-top: 36px; }
article h3 { font-size: 17px; margin-top: 24px; }
.updated { color: var(--muted); font-size: 14px; }
.lang-divider { border: 0; border-top: 1px solid var(--line); margin: 56px 0 8px; }

footer {
  margin-top: 64px;
  padding-top: 24px;
  padding-bottom: 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 13px;
}
footer a { color: var(--muted); margin-right: 16px; }