/* Modern CSS Reset */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --light-color: #f8f9fa;
    --dark-color: #212529;
    
    --transition-speed: 0.2s;
    --border-radius: 0.5rem;
    --box-shadow: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --box-shadow-hover: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
}

/* Base styles */
body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: var(--light-color);
}

main {
    flex: 1;
}

/* Modern navbar */
.navbar {
    background: var(--primary-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.navbar-brand {
    font-weight: 600;
    letter-spacing: 0.5px;
    color: white !important;
}

.nav-link {
    position: relative;
    padding: 0.5rem 1rem;
    color: rgba(255, 255, 255, 0.9) !important;
    transition: color var(--transition-speed);
}

.nav-link:hover {
    color: white !important;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background-color: white;
    transition: all var(--transition-speed);
    transform: translateX(-50%);
}

.nav-link:hover::after {
    width: 100%;
}

/* Modern cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

.card-custom {
    background: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Modern buttons */
.btn {
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    font-weight: 500;
    transition: all var(--transition-speed);
    position: relative;
    overflow: hidden;
    border: none;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%) skewX(-15deg);
    transition: transform 0.3s ease;
}

.btn:hover::before {
    transform: translateX(100%) skewX(-15deg);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #0a58ca);
    border: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color), #157347);
    border: none;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color), #bb2d3b);
    border: none;
}

/* Modern tables */
.table {
    width: 100%;
    margin-bottom: 1rem;
    vertical-align: middle;
    border-color: #dee2e6;
}

.table th {
    background-color: var(--light-color);
    font-weight: 600;
    text-align: left;
    padding: 1rem;
    border-bottom: 2px solid #dee2e6;
}

.table td {
    padding: 1rem;
    vertical-align: middle;
}

.table-responsive {
    border-radius: 0 !important;
    box-shadow: none !important;
    margin-bottom: 1rem;
}

/* Modern forms */
.form-control, .form-select {
    border-radius: var(--border-radius);
    border: 1px solid #dee2e6;
    padding: 0.5rem 1rem;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

/* Modern alerts */
.alert {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

/* Modern badges */
.badge {
    padding: 0.5em 0.75em;
    font-weight: 500;
    border-radius: var(--border-radius);
}

/* Modern list groups */
.list-group-item {
    border: none;
    margin-bottom: 0.5rem;
    border-radius: var(--border-radius) !important;
    box-shadow: var(--box-shadow);
    transition: transform var(--transition-speed);
}

.list-group-item:hover {
    transform: translateX(5px);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
    
    .table-responsive {
        border-radius: var(--border-radius);
        box-shadow: var(--box-shadow);
    }
}

/* Utility classes */
.shadow-hover {
    transition: box-shadow var(--transition-speed);
}

.shadow-hover:hover {
    box-shadow: var(--box-shadow-hover);
}

.text-gradient {
    background: linear-gradient(135deg, var(--primary-color), #0a58ca);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Loading states */
.btn-loading {
    position: relative;
    pointer-events: none;
    opacity: 0.8;
}

.btn-loading::after {
    content: '';
    position: absolute;
    width: 1rem;
    height: 1rem;
    top: calc(50% - 0.5rem);
    left: calc(50% - 0.5rem);
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Print styles */
@media print {
    .navbar, .footer, .btn, .no-print {
        display: none !important;
    }
    
    .container {
        width: 100%;
        max-width: none;
        padding: 0;
        margin: 0;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #dee2e6;
    }
}

/* Scroll to top button */
.scroll-top-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    border: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.scroll-top-btn.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top-btn:hover {
    background: #0a58ca;
    transform: translateY(-2px);
}

/* Center alignment utilities */
.text-center {
    text-align: center !important;
}

.align-center {
    display: flex;
    align-items: center;
    justify-content: center;
}