:root {
  --bg: #f2f2f7;
  --card: #ffffff;
  --text: #000000;
  --secondary: #6c6c70;
  --sep: rgba(60, 60, 67, 0.18);
  --accent: #007aff;
  --accent-text: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #000000;
    --card: #1c1c1e;
    --text: #ffffff;
    --secondary: #98989f;
    --sep: rgba(84, 84, 88, 0.6);
    --accent: #0a84ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

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

.wrap {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 600;
  font-size: 18px;
}
.brand:hover { text-decoration: none; }

.mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--text);
  color: var(--bg);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav { display: flex; gap: 18px; font-size: 15px; }
.nav a { color: var(--secondary); }
.nav a[aria-current="page"] { color: var(--text); font-weight: 500; }

/* Type */
h1 {
  font-size: 34px;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 24px 0 8px;
}

h2 {
  font-size: 20px;
  line-height: 1.3;
  margin: 36px 0 8px;
}

.group-title {
  font-size: 13px;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--secondary);
  margin: 32px 16px 8px;
}

p { margin: 0 0 12px; }

.lede { color: var(--secondary); font-size: 19px; margin-bottom: 24px; }
.meta { color: var(--secondary); font-size: 15px; margin-bottom: 20px; }

ul { margin: 0 0 12px; padding-left: 22px; }
li { margin-bottom: 6px; }

/* Cards */
.card {
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
}

.card-body { padding: 16px; }
.card-body p:last-child, .card-body ul:last-child { margin-bottom: 0; }

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
  padding: 12px 20px;
  border-radius: 12px;
  margin: 4px 0 12px;
}
.button:hover { text-decoration: none; opacity: 0.9; }

.small { font-size: 15px; color: var(--secondary); }

/* FAQ rows */
details { border-top: 1px solid var(--sep); }
details:first-child { border-top: 0; }

summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
summary::-webkit-details-marker { display: none; }

summary::after {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--secondary);
  border-bottom: 2px solid var(--secondary);
  transform: rotate(45deg);
  margin-top: -4px;
  transition: transform 0.15s ease;
}
details[open] summary::after { transform: rotate(225deg); margin-top: 4px; }

details p {
  margin: 0;
  padding: 0 16px 14px;
  color: var(--secondary);
}

/* Footer */
.site-footer {
  margin: 48px 0 32px;
  padding-top: 16px;
  border-top: 1px solid var(--sep);
  font-size: 14px;
  color: var(--secondary);
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.site-footer a { color: var(--secondary); }