:root {
  --bg: #f2f2f2;
  --card: #ffffff;
  --text: #1c1c1c;
  --muted: #5f6368;
  --primary: #2e7d32;
  --border: #dddddd;
  --danger: #c62828;
  --on-danger: #ffffff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --card: #1e1e1e;
    --text: #e8e8e8;
    --muted: #a0a0a0;
    --primary: #66bb6a;
    --border: #333333;
    --danger: #e57373;
    --on-danger: #121212;
  }
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--primary);
  text-decoration: none;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 8px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 20px 8px;
  margin-bottom: 16px;
}

h1 {
  font-size: 28px;
  line-height: 1.25;
  margin: 0 0 4px;
}

h2 {
  font-size: 19px;
  margin: 0 0 8px;
}

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

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

ul,
ol {
  padding-left: 22px;
}

li {
  margin-bottom: 6px;
}

footer {
  margin-top: 32px;
  font-size: 14px;
  color: var(--muted);
}

form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 12px;
}

label {
  font-weight: 600;
}

input[type="email"],
input[type="password"] {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 12px;
}

label.check {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-weight: 400;
  margin-top: 4px;
}

label.check input {
  margin-top: 5px;
}

button {
  font: inherit;
  font-weight: 600;
  color: var(--on-danger);
  background: var(--danger);
  border: none;
  border-radius: 8px;
  padding: 12px;
  cursor: pointer;
  margin-top: 4px;
}

button:disabled {
  opacity: 0.6;
  cursor: default;
}

.error {
  color: var(--danger);
  margin: 0;
}

.success {
  color: var(--primary);
  font-weight: 600;
}