/* CSS Variables for themes */
:root {
  --bg-color: #ffffff;
  --text-color: #1a1a1a;
  --header-bg: #f5f5f5;
  --button-bg: #3b82f6;
  --button-text: #ffffff;
  --button-hover: #2563eb;
  --border-color: #e0e0e0;
}

[data-theme="dark"] {
  --bg-color: #1a1a2e;
  --text-color: #e0e0e0;
  --header-bg: #16213e;
  --button-bg: #6366f1;
  --button-text: #ffffff;
  --button-hover: #4f46e5;
  --border-color: #2d2d4e;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  min-height: 100vh;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
}

h1 {
  font-size: 1.5rem;
}

main {
  padding: 2rem;
}

button {
  padding: 0.5rem 1.2rem;
  background-color: var(--button-bg);
  color: var(--button-text);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95rem;
}

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

#theme-toggle {
  background-color: transparent;
  color: var(--text-color);
  border: 1px solid var(--border-color);
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
}

#theme-toggle:hover {
  background-color: var(--border-color);
}

/* Contact Form */
.contact-section {
  max-width: 560px;
  margin: 3rem auto;
}

.contact-section h2 {
  font-size: 1.6rem;
  margin-bottom: 0.5rem;
}

.contact-desc {
  color: var(--text-color);
  opacity: 0.7;
  margin-bottom: 1.8rem;
  font-size: 0.95rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 1.2rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
}

.form-group input,
.form-group textarea {
  padding: 0.65rem 0.9rem;
  background-color: var(--bg-color);
  color: var(--text-color);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.95rem;
  font-family: inherit;
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--button-bg);
}

.form-group textarea {
  resize: vertical;
}

#submit-btn {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  font-weight: 600;
  margin-top: 0.4rem;
}

#submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

#form-status {
  margin-top: 0.8rem;
  font-size: 0.9rem;
  text-align: center;
  min-height: 1.2rem;
}

#form-status.success {
  color: #22c55e;
}

#form-status.error {
  color: #ef4444;
}