:root {
  --primary-color: #2c3e50;
  --accent-color: #3498db;
  --bg-color: #f8f9fa;
  --card-bg: #ffffff;
  --text-color: #333333;
  --sidebar-width: 250px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  display: flex;
  background-color: var(--bg-color);
  color: var(--text-color);
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--primary-color);
  color: #ffffff;
  padding: 20px 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-header {
  text-align: center;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.sidebar-menu {
  margin-top: 20px;
  list-style: none;
}

.sidebar-menu li a {
  display: flex;
  align-items: center;
  padding: 15px 25px;
  color: #ecf0f1;
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.sidebar-menu li a:hover,
.sidebar-menu li a.active {
  background-color: var(--accent-color);
  border-left: 5px solid #ffffff;
}

.sidebar-menu li a i {
  margin-right: 15px;
  font-size: 18px;
}

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  padding: 30px;
}

.section-title {
  font-size: 24px;
  margin-bottom: 20px;
  color: var(--primary-color);
  border-bottom: 2px solid var(--accent-color);
  display: inline-block;
  padding-bottom: 5px;
}

.card {
  background-color: var(--card-bg);
  border-radius: 8px;
  padding: 20px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  margin-bottom: 25px;
}

.banner-container {
  position: relative;
  width: 100%;
  height: 280px;
  border-radius: 12px;
  overflow: hidden;
  margin-bottom: 25px;
}

.banner-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.banner-overlay {
  position: absolute;
  bottom: 0;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
  width: 100%;
  padding: 20px;
  color: #ffffff;
}

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

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

.form-control {
  width: 100%;
  padding: 10px;
  border: 1px solid #cccccc;
  border-radius: 5px;
}

.btn {
  background-color: var(--accent-color);
  color: #ffffff;
  border: none;
  padding: 10px 20px;
  border-radius: 5px;
  cursor: pointer;
  font-size: 14px;
  text-decoration: none;
  display: inline-block;
}

.btn:hover {
  opacity: 0.9;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}