* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Yu Gothic", sans-serif;
  background-color: #f5f6fa;
  color: #2b2d42;
}

.header {
  padding: 32px 24px;
  text-align: center;
}

.header h1 {
  margin: 0 0 8px;
  font-size: 28px;
}

.subtitle {
  margin: 0;
  color: #6b7280;
  font-size: 14px;
}

.container {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 16px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.card {
  background: #ffffff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
}

.card h2 {
  margin: 0 0 16px;
  font-size: 18px;
}

.count {
  font-size: 40px;
  font-weight: 700;
  text-align: center;
  margin: 0 0 16px;
  color: #4361ee;
}

.button-group {
  display: flex;
  gap: 12px;
  justify-content: center;
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #ffffff;
  background-color: #4361ee;
  cursor: pointer;
  transition: opacity 0.15s ease;
}

button:hover {
  opacity: 0.85;
}

input[type="text"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d1d5db;
  border-radius: 8px;
  font-size: 14px;
}

input[type="text"]:focus {
  outline: none;
  border-color: #4361ee;
}

.greeting {
  margin: 12px 0 0;
  font-size: 14px;
  color: #4361ee;
  min-height: 20px;
}