:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --text: #1c1c1e;
  --muted: #6b6b70;
  --line: #e3e3e8;
  --accent: #16c79a;
  --accent2: #2e8cff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #f2f2f7;
    --muted: #9a9aa0;
    --line: #2c2c2e;
    --accent: #2dd4a8;
    --accent2: #4d9dff;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 20px 64px;
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Pretendard", "Segoe UI", Roboto, sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 720px; margin: 0 auto; }
header {
  text-align: center;
  padding: 56px 0 32px;
}
.logo {
  width: 84px; height: 84px;
  border-radius: 20px;
  display: inline-flex; align-items: center; justify-content: center;
  background: linear-gradient(160deg, var(--accent2), var(--accent));
  color: #fff; font-size: 44px;
  box-shadow: 0 8px 24px rgba(0,0,0,.18);
}
h1 { font-size: 28px; margin: 18px 0 4px; }
.sub { color: var(--muted); margin: 0; }
h2 {
  font-size: 20px; margin: 36px 0 10px;
  padding-bottom: 8px; border-bottom: 1px solid var(--line);
}
h3 { font-size: 16px; margin: 22px 0 6px; }
p, li { color: var(--text); }
.muted { color: var(--muted); font-size: 14px; }
a { color: var(--accent2); text-decoration: none; }
a:hover { text-decoration: underline; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 4px 22px 20px;
  margin-top: 20px;
}
.tagline {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 600;
}
.hero-btns { max-width: 460px; margin: 24px auto 12px; }
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 16px;
}
.feature {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 20px 22px 22px;
}
.feature .ico { font-size: 28px; line-height: 1; }
.feature h3 { margin: 10px 0 6px; font-size: 17px; }
.feature p { margin: 0; font-size: 15px; }
.tag {
  display: inline-block;
  vertical-align: middle;
  margin-left: 6px;
  padding: 1px 8px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.btn {
  flex: 1 1 200px;
  text-align: center;
  padding: 16px;
  border-radius: 14px;
  font-weight: 600;
  background: linear-gradient(160deg, var(--accent2), var(--accent));
  color: #fff !important;
}
.btn.secondary {
  background: var(--card);
  color: var(--text) !important;
  border: 1px solid var(--line);
}
.btn:hover { text-decoration: none; opacity: .92; }
footer {
  text-align: center; margin-top: 48px;
  color: var(--muted); font-size: 13px;
}
code {
  background: var(--line); padding: 2px 6px; border-radius: 6px;
  font-size: 90%;
}