/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #4CAF50;
  --secondary: #2196F3;
  --accent: #FF9800;
  --warning: #FFC107;
  --danger: #F44336;
  --purple: #9C27B0;
  --background: #F5F5F5;
  --card-bg: #FFFFFF;
  --text: #333333;
  --border: #E0E0E0;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--background);
  color: var(--text);
  line-height: 1.6;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: white;
  padding: 15px 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

.user-info {
  display: flex;
  gap: 20px;
  align-items: center;
}

.user-stats {
  display: flex;
  gap: 15px;
}

.stat {
  font-size: 1.1rem;
  font-weight: 600;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Navigation */
.main-nav {
  background: white;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.main-nav ul {
  list-style: none;
  display: flex;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  flex-wrap: wrap;
}

.main-nav li a {
  display: block;
  padding: 15px 20px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  transition: all 0.3s;
}

.main-nav li a:hover,
.main-nav li a.active {
  background-color: var(--primary);
  color: white;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.3s;
}

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

.btn-primary:hover {
  background-color: #45a049;
}

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

.btn-sm {
  padding: 5px 15px;
  font-size: 0.9rem;
}

.btn-block {
  display: block;
  width: 100%;
}

/* Cards */
.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  margin-bottom: 20px;
}

.card-header {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 15px;
  color: var(--primary);
}

/* Forms */
.form-group {
  margin-bottom: 15px;
}

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 600;
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 10px;
  border: 2px solid var(--border);
  border-radius: 5px;
  font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
}

/* Alerts */
.alert {
  padding: 15px;
  border-radius: 5px;
  margin-bottom: 20px;
}

.alert-error {
  background-color: #ffebee;
  color: var(--danger);
  border: 2px solid var(--danger);
}

.alert-success {
  background-color: #e8f5e9;
  color: var(--primary);
  border: 2px solid var(--primary);
}

/* Footer */
.site-footer {
  background-color: var(--text);
  color: white;
  text-align: center;
  padding: 20px;
  margin-top: 40px;
}

.footer-meta {
  font-size: 0.9rem;
  opacity: 0.8;
  margin-top: 5px;
}

/* Login Page */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-box {
  background: white;
  border-radius: 15px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.login-box .logo {
  text-align: center;
  margin-bottom: 30px;
}

.login-box .logo h1 {
  color: var(--primary);
  font-size: 2rem;
  margin-bottom: 10px;
}

.login-footer {
  text-align: center;
  margin-top: 20px;
  color: #666;
}

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: 15px;
  }

  .main-nav ul {
    flex-direction: column;
  }

  .main-nav li a {
    border-bottom: 1px solid var(--border);
  }
}