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

body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

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

/* Navigation */
.navbar {
    background-color: #2c3e50;
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

.navbar h1 {
    display: inline-block;
    margin-right: 2rem;
}

.nav-menu {
    display: inline-block;
    list-style: none;
}

.nav-menu li {
    display: inline-block;
    margin-left: 1.5rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #3498db;
}

/* Main content */
.main-content {
    background-color: white;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    min-height: 500px;
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="file"],
select,
textarea {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #2980b9;
}

.btn-success {
    background-color: #27ae60;
}

.btn-success:hover {
    background-color: #229954;
}

.btn-danger {
    background-color: #e74c3c;
}

.btn-danger:hover {
    background-color: #c0392b;
}

.btn-warning {
    background-color: #f39c12;
}

.btn-warning:hover {
    background-color: #d68910;
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.9rem;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background-color: #2c3e50;
    color: white;
    font-weight: bold;
}

tr:hover {
    background-color: #f5f5f5;
}

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

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

.alert-info {
    background-color: #d1ecf1;
    color: #0c5460;
    border: 1px solid #bee5eb;
}

/* Cards */
.card {
    background-color: white;
    padding: 1.5rem;
    border-radius: 5px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    margin-bottom: 1.5rem;
}

.card h2 {
    margin-bottom: 1rem;
    color: #2c3e50;
}

/* Login form */
.login-container {
    max-width: 400px;
    margin: 100px auto;
    background-color: white;
    padding: 2rem;
    border-radius: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-container h1 {
    text-align: center;
    margin-bottom: 2rem;
    color: #2c3e50;
}

/* Status badges */
.status-badge {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    border-radius: 3px;
    font-size: 0.85rem;
    font-weight: bold;
}

.status-pending {
    background-color: #ffeaa7;
    color: #856404;
}

.status-accepted {
    background-color: #55efc4;
    color: #155724;
}

.status-declined {
    background-color: #fab1a0;
    color: #721c24;
}

/* Filter form */
.filter-form {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.filter-form .form-group {
    display: inline-block;
    margin-right: 1rem;
    margin-bottom: 0;
}

.filter-form label {
    display: inline-block;
    margin-right: 0.5rem;
    font-weight: normal;
}

.filter-form select,
.filter-form input {
    width: auto;
    display: inline-block;
}

/* Footer */
.footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem 0;
    margin-top: 3rem;
}

/* Dashboard stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background-color: #3498db;
    color: white;
    padding: 1.5rem;
    border-radius: 5px;
    text-align: center;
}

.stat-card h3 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 1.1rem;
}

.stat-card.success {
    background-color: #27ae60;
}

.stat-card.warning {
    background-color: #f39c12;
}

.stat-card.danger {
    background-color: #e74c3c;
}