/* Modern CSS Reset and Variables */
:root {
  --bg-color: #f8f9fa;
  --container-bg: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --accent-color: #4CAF50;
  --accent-hover: #45a049;
  --border-color: #e0e0e0;
  --input-bg: #ffffff;
  --shadow-color: rgba(0, 0, 0, 0.1);
  --header-bg: #ffffff;
  --transition-speed: 0.3s;
}

/* Dark Mode Variables */
body.dark-mode {
  --bg-color: #121212;
  --container-bg: #1e1e1e;
  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --accent-color: #81c784;
  --accent-hover: #66bb6a;
  --border-color: #333333;
  --input-bg: #2d2d2d;
  --shadow-color: rgba(0, 0, 0, 0.4);
  --header-bg: #1e1e1e;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: background-color var(--transition-speed), color var(--transition-speed);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

#app {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

header {
  padding: 40px 0;
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 40px;
  border-radius: 0 0 16px 16px;
  box-shadow: 0 4px 10px var(--shadow-color);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--accent-color);
}

.theme-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 10px 15px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  color: var(--text-primary);
  transition: all var(--transition-speed);
}

.theme-btn:hover {
  background-color: var(--border-color);
  transform: rotate(20deg);
}

main {
  flex: 1;
}

.contact-section {
  background-color: var(--container-bg);
  padding: 40px;
  border-radius: 16px;
  box-shadow: 0 10px 30px var(--shadow-color);
  border: 1px solid var(--border-color);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

p {
  color: var(--text-secondary);
  margin-bottom: 30px;
}

/* Form Styles */
#contact-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

label {
  font-weight: 600;
  font-size: 0.9rem;
}

input, textarea {
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-size: 1rem;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

input:focus, textarea:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
}

.submit-btn {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 14px;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 700;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  margin-top: 10px;
}

.submit-btn:hover {
  background-color: var(--accent-hover);
}

.submit-btn:active {
  transform: scale(0.98);
}

footer {
  padding: 40px 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

@media (max-width: 600px) {
  .contact-section {
    padding: 20px;
  }
}