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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: url('images/bkg.jpg') no-repeat center center fixed;
    background-size: cover;
    min-height: 100vh;
    color: #333;
}

/* Header Styles */
.header {
    background-color: #2c3e50;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

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

.logo {
    height: 50px;
}

.year-selector select {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    background-color: #34495e;
    color: white;
    font-size: 16px;
    cursor: pointer;
}

.year-selector select:focus {
    outline: none;
    background-color: #3498db;
}

.user-info {
    color: white;
    display: flex;
    align-items: center;
    gap: 15px;
}

.logout-btn {
    background-color: #e74c3c;
    color: white;
    border: none;
    padding: 8px 15px;
    border-radius: 5px;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
}

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

/* Main Content */
.main-content {
    background-color: rgba(255, 255, 255, 0.95);
    margin: 20px;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    min-height: calc(100vh - 140px);
}

/* Login/Register Forms */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}

.auth-form {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-form .logo {
    height: 80px;
    margin-bottom: 30px;
}

.auth-form h2 {
    margin-bottom: 30px;
    color: #2c3e50;
    font-weight: 300;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    color: #555;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.btn-primary {
    background-color: #3498db;
    color: white;
}

.btn-primary:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
}

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

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

.btn-secondary {
    background-color: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background-color: #7f8c8d;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}

/* Table Styles */
.table-responsive {
    margin-top: 20px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: #34495e;
    color: white;
    border: none;
    padding: 15px;
    font-weight: 500;
    text-transform: uppercase;
    font-size: 14px;
    letter-spacing: 0.5px;
}

.table tbody td {
    padding: 12px 15px;
    border-top: 1px solid #ecf0f1;
    vertical-align: middle;
}

.table tbody tr:hover {
    background-color: #f8f9fa;
}

/* Alert Styles */
.alert {
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
    border: none;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border-left: 4px solid #27ae60;
}

.alert-danger {
    background-color: #f8d7da;
    color: #721c24;
    border-left: 4px solid #e74c3c;
}

/* Modal Styles */
.modal-content {
    border-radius: 15px;
    border: none;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.modal-header {
    background-color: #34495e;
    color: white;
    border-radius: 15px 15px 0 0;
    border-bottom: none;
}

.modal-header .btn-close {
    filter: invert(1);
}

.modal-body {
    padding: 30px;
}

.modal-footer {
    border-top: none;
    padding: 20px 30px;
}

/* Navigation */
.nav-tabs {
    margin-bottom: 20px;
    border-bottom: 2px solid #34495e;
}

.nav-tabs .nav-link {
    border: none;
    color: #34495e;
    font-weight: 500;
    padding: 12px 20px;
    border-radius: 8px 8px 0 0;
    margin-right: 5px;
}

.nav-tabs .nav-link.active {
    background-color: #34495e;
    color: white;
}

.nav-tabs .nav-link:hover {
    background-color: #ecf0f1;
    border-color: transparent;
}

/* Responsive */
@media (max-width: 768px) {
    .main-content {
        margin: 10px;
        padding: 20px;
    }
    
    .auth-form {
        padding: 30px 20px;
    }
    
    .header .container {
        flex-direction: column;
        gap: 15px;
    }
    
    .table-responsive {
        font-size: 14px;
    }
}

/* Loading Spinner */
.spinner-border {
    width: 1rem;
    height: 1rem;
    border-width: 0.1em;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}