:root {
  --teal: #27BAA8;
  --teal-dark: #1A8074;
  --teal-bg: #E0F4F1;
  --text: #1F2933;
  --text-muted: #5A6573;
  --border: #E2E8F0;
  --max-width: 760px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: #FFFFFF;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

header {
  background: linear-gradient(180deg, var(--teal-bg) 0%, #FFFFFF 100%);
  border-bottom: 1px solid var(--border);
}

header .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

header img.icon {
  width: 64px;
  height: 64px;
  border-radius: 14px;
}

header h1 {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0.02em;
  color: var(--teal-dark);
}

header .lang {
  margin-left: auto;
  font-size: 14px;
}

header .lang a {
  color: var(--teal-dark);
  text-decoration: none;
  margin-left: 12px;
}

header .lang a:hover { text-decoration: underline; }

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 24px 64px;
}

main h2 {
  font-size: 22px;
  margin: 32px 0 12px;
  color: var(--teal-dark);
  border-left: 4px solid var(--teal);
  padding-left: 12px;
}

main h3 {
  font-size: 16px;
  margin: 20px 0 8px;
  color: var(--text);
}

main p, main li { font-size: 15px; }

main a { color: var(--teal-dark); }

main code {
  font-family: SFMono-Regular, Menlo, monospace;
  background: var(--teal-bg);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.92em;
}

.lead {
  font-size: 17px;
  color: var(--text-muted);
}

.card {
  background: var(--teal-bg);
  border-radius: 12px;
  padding: 18px 22px;
  margin: 20px 0;
}

.muted { color: var(--text-muted); font-size: 13px; }

.btn {
  display: inline-block;
  background: var(--teal);
  color: #FFFFFF !important;
  padding: 12px 22px;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
  margin-right: 8px;
}

.btn:hover { background: var(--teal-dark); }

footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

footer a { color: var(--text-muted); margin: 0 8px; }