:root {
    /* Paris-Saclay Brand Colors */
    --paris-saclay-plum: #63003C;
    --paris-saclay-light-plum: #8B1963;
    --paris-saclay-dark-plum: #4A002C;
    --paris-saclay-accent: #E8336D;
    --paris-saclay-light-gray: #F5F5F5;
    --paris-saclay-gray: #666666;
    --paris-saclay-dark-gray: #333333;
    --paris-saclay-white: #FFFFFF;
}

/* Global Typography */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: var(--paris-saclay-dark-gray);
    background-color: var(--paris-saclay-light-gray);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    color: var(--paris-saclay-plum);
}

/* Navigation Bar */
.navbar {
    background-color: var(--paris-saclay-plum) !important;
    box-shadow: 0 2px 10px rgba(99, 0, 60, 0.15);
}

.navbar-brand {
    color: var(--paris-saclay-white) !important;
    font-weight: 600;
    font-size: 1.1rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9) !important;
    font-weight: 500;
    transition: all 0.3s ease;
    border-radius: 6px;
    margin: 0 2px;
}

.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.15) !important;
    color: var(--paris-saclay-white) !important;
    transform: translateY(-1px);
}

/* Buttons */
.btn-primary {
    background-color: var(--paris-saclay-plum);
    border-color: var(--paris-saclay-plum);
    font-weight: 500;
    border-radius: 6px;
    box-shadow: 0 2px 8px rgba(99, 0, 60, 0.2);
}

.btn-primary:hover {
    background-color: var(--paris-saclay-dark-plum);
    border-color: var(--paris-saclay-dark-plum);
    box-shadow: 0 4px 12px rgba(99, 0, 60, 0.3);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: var(--paris-saclay-gray);
    border-color: var(--paris-saclay-gray);
    color: var(--paris-saclay-white);
    font-weight: 500;
    border-radius: 6px;
}

.btn-secondary:hover {
    background-color: var(--paris-saclay-dark-gray);
    border-color: var(--paris-saclay-dark-gray);
    transform: translateY(-1px);
}

.btn-success {
    background-color: #28a745;
    border-color: #28a745;
    border-radius: 6px;
    font-weight: 500;
}

.btn-warning {
    background-color: #ffc107;
    border-color: #ffc107;
    color: var(--paris-saclay-dark-gray);
    border-radius: 6px;
    font-weight: 500;
}

.btn-danger {
    background-color: #dc3545;
    border-color: #dc3545;
    border-radius: 6px;
    font-weight: 500;
}

/* Cards */
.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
    transform: translateY(-2px);
}

.card-header {
    border-radius: 12px 12px 0 0 !important;
    font-weight: 600;
    border: none;
    padding: 1.25rem 1.5rem;
}

.bg-primary {
    background-color: var(--paris-saclay-plum) !important;
}

.bg-info {
    background-color: var(--paris-saclay-accent) !important;
}

/* Tables */
.table {
    border-radius: 8px;
    overflow: hidden;
}

.table-dark {
    background-color: var(--paris-saclay-plum);
    color: var(--paris-saclay-white);
}

.table-striped > tbody > tr:nth-of-type(odd) > td {
    background-color: rgba(99, 0, 60, 0.03);
}

.table th {
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    border-top: none;
}

/* Tabs */
.nav-tabs {
    border-bottom: 2px solid var(--paris-saclay-light-gray);
}

.nav-tabs .nav-link {
    border: none;
    color: var(--paris-saclay-gray);
    font-weight: 500;
    padding: 1rem 1.5rem;
    border-radius: 8px 8px 0 0;
    margin-bottom: -2px;
    transition: all 0.3s ease;
}

.nav-tabs .nav-link:not(.active) {
    color: var(--paris-saclay-gray) !important;
}

.nav-tabs .nav-link:not(.active):hover {
    color: var(--paris-saclay-plum) !important;
    background-color: rgba(99, 0, 60, 0.05);
}

.nav-tabs .nav-link.active {
    color: var(--paris-saclay-plum) !important;
    background-color: var(--paris-saclay-white);
    border-bottom: 3px solid var(--paris-saclay-plum);
    font-weight: 600;
}

/* Alerts */
.alert-success {
    background-color: #d4edda;
    border-color: #c3e6cb;
    color: #155724;
    border-radius: 8px;
    border-left: 4px solid #28a745;
}

.alert-danger {
    background-color: #f8d7da;
    border-color: #f5c6cb;
    color: #721c24;
    border-radius: 8px;
    border-left: 4px solid #dc3545;
}

/* Forms */
.form-control, .form-select {
    border: 2px solid #e9ecef;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
}

.form-control:focus, .form-select:focus {
    border-color: var(--paris-saclay-plum);
    box-shadow: 0 0 0 0.2rem rgba(99, 0, 60, 0.15);
}

.form-label {
    font-weight: 600;
    color: var(--paris-saclay-plum);
    margin-bottom: 0.5rem;
}

/* Badges */
.badge {
    border-radius: 6px;
    font-weight: 500;
}

.bg-secondary {
    background-color: var(--paris-saclay-gray) !important;
}

/* Footer */
footer {
    background-color: var(--paris-saclay-plum);
    color: var(--paris-saclay-white);
}

/* Modern table styling */
.student-details {
    width: 100%;
    max-width: 800px;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 16px;
    text-align: center;
    box-shadow: 0 6px 20px rgba(99, 0, 60, 0.1);
    border-radius: 8px;
    overflow: hidden;
}

.student-details th, .student-details td {
    padding: 12px;
    border: 1px solid rgba(99, 0, 60, 0.1);
}

.student-details th {
    background-color: var(--paris-saclay-plum);
    color: var(--paris-saclay-white);
    text-transform: uppercase;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.student-details tr:nth-child(even) {
    background-color: rgba(99, 0, 60, 0.03);
}

.student-details tr:hover {
    background-color: rgba(99, 0, 60, 0.05);
    transition: background-color 0.3s ease;
}

.student-details td {
    font-weight: 500;
}

/* Status buttons */
.btn-in {
    background-color: #28a745;
    color: var(--paris-saclay-white);
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-in:hover {
    background-color: #218838;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(40, 167, 69, 0.3);
}

.btn-out {
    background-color: #dc3545;
    color: var(--paris-saclay-white);
    padding: 10px 20px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.btn-out:hover {
    background-color: #c82333;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(220, 53, 69, 0.3);
}

/* Edit functionality styles */
.edit-row {
    background-color: rgba(99, 0, 60, 0.05);
    border-left: 4px solid var(--paris-saclay-plum);
}

.edit-row input {
    margin-bottom: 0.25rem;
    border: 2px solid var(--paris-saclay-plum);
}

.edit-controls {
    display: flex;
    gap: 0.25rem;
    flex-wrap: wrap;
}

.edit-controls .btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.75rem;
    border-radius: 4px;
    font-weight: 500;
}

/* Container improvements */
.container {
    background-color: var(--paris-saclay-white);
    border-radius: 8px;
    padding: 2rem;
    margin-top: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

/* Responsive improvements */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
        margin: 1rem;
        border-radius: 6px;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .table-responsive {
        border-radius: 6px;
    }
}