:root {
  color-scheme: light dark;
  --bg: #f7f5f0;
  --panel: rgba(255, 255, 255, 0.82);
  --text: #1f211e;
  --muted: #6f746d;
  --line: rgba(31, 33, 30, 0.14);
  --accent: #2f7d55;
  --sign-red: #b31b2c;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  line-height: 1.55;
}

body {
  margin: 0;
  min-height: 100vh;
  background: linear-gradient(180deg, #fbfaf6 0%, #f3f0e8 100%);
}

a {
  color: var(--accent);
}

.page {
  width: min(880px, calc(100% - 32px));
  margin: 0 auto;
  padding: 40px 0 64px;
}

.masthead {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 0 34px;
}

.app-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  box-shadow: 0 16px 42px rgba(31, 33, 30, 0.18);
}

.brand {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
}

.tagline {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 14px;
}

main {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(31, 33, 30, 0.10);
}

h1 {
  margin: 0 0 6px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.03;
  letter-spacing: 0;
}

h2 {
  margin: 32px 0 10px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  letter-spacing: 0;
}

h3 {
  margin: 22px 0 8px;
  font-size: 17px;
  letter-spacing: 0;
}

p {
  margin: 0 0 14px;
}

ul {
  margin: 0 0 18px;
  padding-left: 24px;
}

li + li {
  margin-top: 6px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
}

.callout {
  margin: 22px 0;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.56);
}

.warning {
  border-left: 4px solid var(--sign-red);
}

.footer {
  margin-top: 26px;
  color: var(--muted);
  font-size: 13px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151714;
    --panel: rgba(255, 255, 255, 0.075);
    --text: #f7f5ef;
    --muted: #aeb4aa;
    --line: rgba(255, 255, 255, 0.16);
    --accent: #75c99b;
  }

  body {
    background: linear-gradient(180deg, #171916 0%, #10120f 100%);
  }

  main {
    box-shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
  }

  .callout {
    background: rgba(255, 255, 255, 0.06);
  }
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 24px, 880px);
    padding-top: 24px;
  }

  main {
    padding: 22px;
  }

  .app-icon {
    width: 52px;
    height: 52px;
    border-radius: 13px;
  }
}