/* Dark Theme - Professional Website */

:root {
  --primary-color: #ecf0f1;
  --secondary-color: #3498db;
  --accent-color: #e74c3c;
  --success-color: #27ae60;
  --warning-color: #f39c12;
  --danger-color: #e74c3c;
  --info-color: #3498db;
  
  --bg-primary: #1a1a1a;
  --bg-secondary: #2d2d2d;
  --bg-tertiary: #3d3d3d;
  
  --text-primary: #ecf0f1;
  --text-secondary: #bdc3c7;
  --text-light: #95a5a6;
  
  --border-color: #404040;
  --border-light: #2d2d2d;
  
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
  
  --transition: all 0.3s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  color: var(--primary-color);
  font-weight: 600;
  margin-bottom: 1rem;
  line-height: 1.2;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: 1rem;
  color: var(--text-secondary);
}

a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: var(--transition);
  text-align: center;
}

.btn-primary {
  background-color: var(--secondary-color);
  color: white;
}

.btn-primary:hover {
  background-color: #2980b9;
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background-color: #ecf0f1;
  color: #1a1a1a;
}

.btn-secondary:hover {
  background-color: #bdc3c7;
  box-shadow: var(--shadow-md);
}

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

.btn-accent:hover {
  background-color: #c0392b;
  box-shadow: var(--shadow-md);
}

.btn-outline {
  background-color: transparent;
  color: var(--secondary-color);
  border: 2px solid var(--secondary-color);
}

.btn-outline:hover {
  background-color: var(--secondary-color);
  color: white;
}

/* Forms */
input, textarea, select {
  width: 100%;
  padding: 0.75rem;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  transition: var(--transition);
  font-family: inherit;
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--secondary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
}

/* Cards */
.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-md);
}

/* Header */
header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 0;
  box-shadow: var(--shadow-sm);
}

nav a {
  display: inline-block;
  margin: 0 1.5rem;
  color: var(--text-primary);
  font-weight: 500;
  transition: var(--transition);
}

nav a:hover {
  color: var(--secondary-color);
  text-decoration: none;
}

/* Footer */
footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 2rem;
  margin-top: 3rem;
  text-align: center;
}

footer p {
  color: var(--text-secondary);
}

/* Sections */
section {
  padding: 2rem 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Alerts */
.alert {
  padding: 1rem;
  border-radius: 4px;
  margin-bottom: 1rem;
  border-left: 4px solid;
}

.alert-success {
  background-color: #1e4620;
  border-left-color: var(--success-color);
  color: #90ee90;
}

.alert-warning {
  background-color: #4d3a0f;
  border-left-color: var(--warning-color);
  color: #ffd700;
}

.alert-danger {
  background-color: #4a1f1f;
  border-left-color: var(--danger-color);
  color: #ff6b6b;
}

.alert-info {
  background-color: #1a3a4a;
  border-left-color: var(--info-color);
  color: #87ceeb;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

th, td {
  padding: 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

th {
  background-color: var(--bg-tertiary);
  font-weight: 600;
  color: var(--primary-color);
}

tr:hover {
  background-color: var(--bg-tertiary);
}

/* Responsive */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.75rem; }
  
  .container {
    padding: 0 1rem;
  }
  
  nav a {
    display: block;
    margin: 0.5rem 0;
  }
}