:root {
  --bg: #f7f8fa;
  --text: #1f2937;
  --muted: #6b7280;
  --brand: #2a6cf6;
  --card: #ffffff;
  --border: #e5e7eb;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

.container {
  width: 100%;
  max-width: 1120px;
  padding: 0 24px;
  margin: 0 auto;
}

.narrow { max-width: 880px; }

.site-header {
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand { font-weight: 600; color: var(--text); }
.nav a { color: var(--muted); text-decoration: none; margin-left: 20px; }
.nav a:hover { color: var(--text); }

.hero { padding: 64px 0 24px; }
.hero h1 { font-size: 40px; margin: 0; text-align: center; }
.hero .subtitle { text-align: center; color: var(--muted); font-size: 18px; margin: 12px 0 16px; }
.hero .desc { text-align: center; color: var(--muted); }

.showcase { padding: 16px 0 0 24px; }
.mock {
  /* background: var(--card); */
  border: none;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 0;
}
.mock img { display: block; width: 100%; height: auto; }

.features {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 14px;
}
.feature {
  /* background: var(--card); */
  /* border: 1px solid var(--border); */
  border-radius: 12px;
  padding: 16px;
}
.feature-title { font-weight: 600; text-align: center; }

.cta { padding: 24px 0 40px; }
.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}
.btn.primary { background: var(--brand); color: #fff; }
.btn.primary:hover { opacity: .92; }

.download { padding-bottom: 12px; padding-top: 30px; }
.download div { text-align: center; color: #FF6B35; font-weight: 600;font-size: 24px; }


.site-footer {
  background: #fff;
  border-top: 1px solid var(--border);
  padding: 28px 0;
}
.site-footer .container {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 320px));
  gap: 16px;
  justify-content: center;
  justify-items: start;
}
.footer-col { text-align: left; }
.footer-title { font-weight: 600; margin-bottom: 10px; }
.links, .info { list-style: none; padding: 0; margin: 0; }
.info { color: #999999; }
.info a { color: #999999; text-decoration: none; }
.links a { color: var(--brand); text-decoration: none; }
.links a:hover { text-decoration: underline; }

@media (max-width: 960px) {
  .features { grid-template-columns: repeat(2, 1fr); }
  .site-footer .container { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}

@media (max-width: 520px) {
  .features { grid-template-columns: 1fr; }
}