:root {
  --color-primary: #2b2b7a;
  --color-bg: #f4f4f8;
  --color-card: #ffffff;
  --color-text: #333333;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
  max-width: 560px;
  margin: 40px auto;
  background-color: var(--color-card);
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

header {
  background-color: var(--color-primary);
  color: white;
  text-align: center;
  padding: 32px 20px;
  transition: background-color 0.2s ease;
}

header h1 {
  margin: 0 0 6px;
}

.subtitle {
  margin: 0;
  opacity: 0.85;
}

main {
  padding: 28px;
}

.card {
  background-color: var(--color-bg);
  border-radius: 8px;
  padding: 18px 20px;
  margin-bottom: 20px;
}

.card:last-child {
  margin-bottom: 0;
}

.card h2 {
  margin-top: 0;
  color: var(--color-primary);
  font-size: 18px;
}

input[type="text"], select {
  width: 100%;
  padding: 8px 10px;
  font-size: 15px;
  border: 1px solid #ccc;
  border-radius: 6px;
  margin-top: 6px;
  box-sizing: border-box;
}

button {
  margin-top: 10px;
  padding: 10px 18px;
  background-color: var(--color-primary);
  color: white;
  border: none;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

button:hover {
  transform: translateY(-2px);
}

#greeting {
  font-weight: bold;
  min-height: 20px;
}

.counter {
  font-size: 13px;
  color: #777;
}

footer {
  text-align: center;
  padding: 16px;
  font-size: 13px;
  color: #777;
  border-top: 1px solid var(--color-bg);
}

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

/* Dark mode, toggled by JavaScript adding/removing this class on <body> */
body.dark-mode {
  background-color: #1a1a22;
  color: #eaeaea;
}

body.dark-mode .container {
  background-color: #26262f;
}

body.dark-mode .card {
  background-color: #1f1f28;
}

body.dark-mode input[type="text"],
body.dark-mode select {
  background-color: #2c2c38;
  border-color: #444;
  color: #eaeaea;
}

body.dark-mode .counter,
body.dark-mode footer {
  color: #999;
}