:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --accent: #2b6cb0;
  --muted: #666666;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #f0f0f0;
    --accent: #63b3ed;
    --muted: #aaaaaa;
  }
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

h1, h2 {
  line-height: 1.2;
}

a.button, button {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  font-size: 1rem;
  cursor: pointer;
  text-decoration: none;
}

.muted {
  color: var(--muted);
}

input[type="email"] {
  font-size: 1rem;
  padding: 0.6rem;
  width: 100%;
  max-width: 320px;
  box-sizing: border-box;
  margin-bottom: 1rem;
}

.module-list {
  list-style: none;
  padding: 0;
}

.module-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid rgba(128, 128, 128, 0.2);
}

.lang-picker {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 100;
}

[dir="rtl"] .lang-picker {
  right: auto;
  left: 1rem;
}

.lang-picker select {
  font-size: 0.9rem;
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  border: 1px solid rgba(128, 128, 128, 0.4);
  background: var(--bg);
  color: var(--fg);
}