/* Global Styles */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --info-color: #17a2b8;
    --light-gray: #ecf0f1;
    --dark-gray: #34495e;
    --white: #ffffff;
    --shadow: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 8px rgba(0,0,0,0.15);
}

html {
    font-size: 14px;
    position: relative;
    min-height: 100vh;
}

@media (min-width: 768px) {
    html {
        font-size: 16px;
    }
}

body {
    margin-bottom: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f8f9fa;
    color: var(--dark-gray);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Navigation Styles */
.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%) !important;
    box-shadow: var(--shadow-lg);
    padding: 0.75rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white) !important;
    text-shadow: 0 1px 2px rgba(0,0,0,0.3);
}

.navbar-brand:hover {
    color: var(--light-gray) !important;
    transform: translateY(-1px);
    transition: all 0.3s ease;
}

.navbar-nav .nav-link {
    color: var(--white) !important;
    font-weight: 500;
    padding: 0.75rem 1rem;
    border-radius: 0.375rem;
    margin: 0 0.25rem;
    transition: all 0.3s ease;
}

.navbar-nav .nav-link:hover {
    background-color: rgba(255,255,255,0.1);
    color: var(--light-gray) !important;
    transform: translateY(-1px);
}

.navbar-nav .nav-link.active {
    background-color: rgba(255,255,255,0.2);
    color: var(--white) !important;
}

/* Dropdown Styles */
.dropdown-menu {
    border: none;
    box-shadow: var(--shadow-lg);
    border-radius: 0.5rem;
    padding: 0.5rem 0;
    margin-top: 0.5rem;
    background: var(--white);
    border: 1px solid rgba(0,0,0,0.1);
}

.dropdown-item {
    padding: 0.75rem 1.5rem;
    color: var(--dark-gray);
    font-weight: 500;
    transition: all 0.2s ease;
    border-radius: 0.25rem;
    margin: 0 0.5rem;
}

.dropdown-item:hover {
    background-color: var(--secondary-color);
    color: var(--white);
    transform: translateX(5px);
}

.dropdown-item i {
    width: 1rem;
    text-align: center;
}

/* Button Styles */
.btn {
    border-radius: 0.5rem;
    font-weight: 500;
    padding: 0.5rem 1.5rem;
    transition: all 0.3s ease;
    border: none;
    box-shadow: var(--shadow);
}

.btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

.btn-primary {
    background: linear-gradient(135deg, var(--secondary-color) 0%, #2980b9 100%);
    border: none;
}

.btn-primary:hover {
    background: linear-gradient(135deg, #2980b9 0%, var(--secondary-color) 100%);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #229954 100%);
    border: none;
}

.btn-success:hover {
    background: linear-gradient(135deg, #229954 0%, var(--success-color) 100%);
    transform: translateY(-2px);
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #e67e22 100%);
    border: none;
}

.btn-warning:hover {
    background: linear-gradient(135deg, #e67e22 0%, var(--warning-color) 100%);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--accent-color) 0%, #c0392b 100%);
    border: none;
}

.btn-danger:hover {
    background: linear-gradient(135deg, #c0392b 0%, var(--accent-color) 100%);
    transform: translateY(-2px);
}

/* Form Styles */
.form-control {
    border-radius: 0.5rem;
    border: 2px solid var(--light-gray);
    padding: 0.75rem 1rem;
    transition: all 0.3s ease;
    font-size: 1rem;
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
    transform: translateY(-1px);
}

.form-label {
    font-weight: 600;
    color: var(--dark-gray);
    margin-bottom: 0.5rem;
}

/* Card Styles */
.card {
    border: none;
    border-radius: 1rem;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border: none;
    padding: 1.5rem;
    font-weight: 600;
}

.card-body {
    padding: 2rem;
}

/* Table Styles */
.table {
    border-radius: 0.5rem;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.table thead th {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    border: none;
    padding: 1rem;
    font-weight: 600;
}

.table tbody tr {
    transition: all 0.2s ease;
}

.table tbody tr:hover {
    background-color: rgba(52, 152, 219, 0.05);
    transform: scale(1.01);
}

/* Alert Styles */
.alert {
    border: none;
    border-radius: 0.5rem;
    padding: 1rem 1.5rem;
    font-weight: 500;
    box-shadow: var(--shadow);
}

.alert-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #229954 100%);
    color: var(--white);
}

.alert-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #e67e22 100%);
    color: var(--white);
}

.alert-danger {
    background: linear-gradient(135deg, var(--accent-color) 0%, #c0392b 100%);
    color: var(--white);
}

.alert-info {
    background: linear-gradient(135deg, var(--info-color) 0%, #138496 100%);
    color: var(--white);
}

/* Footer Styles */
.footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--dark-gray) 100%);
    color: var(--light-gray);
    padding: 2rem 0;
    margin-top: auto;
    flex-shrink: 0;
}

.footer a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: all 0.3s ease;
}

.footer a:hover {
    color: var(--white);
    text-decoration: underline;
}

/* Utility Classes */
.shadow-custom {
    box-shadow: var(--shadow);
}

.shadow-custom-lg {
    box-shadow: var(--shadow-lg);
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
}

.bg-gradient-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #229954 100%);
}

.bg-gradient-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #e67e22 100%);
}

.bg-gradient-danger {
    background: linear-gradient(135deg, var(--accent-color) 0%, #c0392b 100%);
}

/* Responsive Design */
@media (max-width: 768px) {
    .navbar-nav .nav-link {
        padding: 0.5rem 0.75rem;
        margin: 0.25rem 0;
    }
    
    .dropdown-menu {
        margin-top: 0;
        border-radius: 0;
    }
    
    .card-body {
        padding: 1.5rem;
    }
    
    .table-responsive {
        border-radius: 0.5rem;
        overflow: hidden;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.slide-in {
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-100%); }
    to { transform: translateX(0); }
}

/* Loading Spinner */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--light-gray);
    border-top: 4px solid var(--secondary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

::-webkit-scrollbar-track {
    background: var(--light-gray);
}

::-webkit-scrollbar-thumb {
    background: var(--secondary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}