* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: system-ui, -apple-system, sans-serif;
}

:root {
  --primary-color: #b03052;
  --primary-hover: #d76c82;
  --bg-color: #f5f5f5;
  --card-bg: white;
  --text-color: #333;
  --text-secondary: #4b5563;
  --border-color: #ddd;
  --result-bg: #f8f9fa;
  --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
  min-height: 100vh;
  background: var(--bg-color);
  padding: 2rem;
  color: var(--text-color);
}

.container {
  max-width: 600px;
  margin: 0 auto;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 2px 10px var(--shadow-color);
}

h1 {
  color: var(--text-color);
  margin-bottom: 2rem;
  font-size: 1.5rem;
}

label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.input-group {
  margin-bottom: 1.5rem;
}

textarea {
  width: 100%;
  height: 100px;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  resize: vertical;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  background-color: var(--card-bg);
  color: var(--text-color);
}

.timezone-selects {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  background: var(--card-bg);
  font-size: 0.9rem;
  color: var(--text-color);
}

.button-container {
  display: flex;
  justify-content: flex-end;
}

button {
  background: var(--primary-color);
  color: white;
  border: none;
  padding: 0.75rem 1.5rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.9rem;
  transition: background 0.2s;
}

button:hover {
  background: var(--primary-hover);
}

#result {
  margin-top: 1.5rem;
  padding: 1rem;
  background: var(--result-bg);
  border-radius: 6px;
  white-space: pre-wrap;
  font-size: 0.9rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #ffffff;
    --text-secondary: #a0a0a0;
    --border-color: #404040;
    --result-bg: #363636;
  }
  label {
    color: var(--text-color);
  }
}

@media (max-width: 480px) {
  .timezone-selects {
    grid-template-columns: 1fr;
  }

  body {
    padding: 1rem;
  }

  .container {
    padding: 1.5rem;
  }
}