:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5f5f5f;
  --accent: #2b6cb0;
  --border: #e4e4e4;
  --card-bg: #f7f7f8;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --fg: #f0f0f0;
    --muted: #a8a8a8;
    --accent: #6ea8dc;
    --border: #2a2a2a;
    --card-bg: #1b1b1d;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 24px;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
}

header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  font-weight: 700;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 20px;
  font-size: 0.95rem;
}

nav a:first-child { margin-left: 0; }

nav a:hover, nav a:focus {
  color: var(--accent);
}

main {
  padding: 56px 0 64px;
}

h1 {
  font-size: 2rem;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.25rem;
  margin: 40px 0 12px;
}

p.lead {
  color: var(--muted);
  font-size: 1.1rem;
  margin: 0 0 32px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px 24px;
  margin: 24px 0;
}

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

.updated {
  color: var(--muted);
  font-size: 0.9rem;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--muted);
  font-size: 0.9rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
}

.hint {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.85rem;
}

input[type="text"],
input[type="email"],
textarea {
  width: 100%;
  padding: 10px 12px;
  font-size: 1rem;
  font-family: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}

textarea {
  resize: vertical;
  min-height: 100px;
}

button {
  align-self: flex-start;
  padding: 10px 20px;
  font-size: 1rem;
  font-family: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

button:hover, button:focus {
  opacity: 0.9;
}

.faq dt {
  font-weight: 600;
  margin-top: 16px;
}

.faq dd {
  margin: 4px 0 0;
  color: var(--muted);
}