:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --button-bg: #e0e0e0;
  --button-text: #1a1a1a;
  --accent-color: #007bff;
  --transition-speed: 0.3s;
}

[data-theme="dark"] {
  --bg-color: #121212;
  --text-color: #f0f0f0;
  --button-bg: #333333;
  --button-text: #f0f0f0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  margin: 0;
  padding: 40px 20px;
}

.contact-section {
  width: 100%;
  max-width: 500px;
  margin-top: 50px;
}

.contact-card {
  background-color: var(--button-bg);
  padding: 30px;
  border-radius: 16px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
  transition: background-color var(--transition-speed);
}

.contact-card h2 {
  margin-top: 0;
  font-size: 1.5rem;
}

.form-group {
  margin-bottom: 20px;
  text-align: left;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid rgba(0, 0, 0, 0.1);
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: inherit;
  font-size: 1rem;
  box-sizing: border-box;
}

.submit-btn {
  width: 100%;
  padding: 14px;
  background-color: var(--accent-color);
  color: white;
  border: none;
  border-radius: 8px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.submit-btn:hover {
  opacity: 0.9;
}

.comments-section {
  width: 100%;
  max-width: 800px;
  margin-top: 60px;
  padding-bottom: 50px;
}

.theme-toggle {
  padding: 10px 20px;
  cursor: pointer;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: 8px;
  font-weight: 600;
  transition: all var(--transition-speed);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.theme-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.theme-toggle:active {
  transform: translateY(0);
}