/* CSS Variables for consistent theming */
:root {
    --primary-color: #0d6efd;
    --success-color: #198754;
    --danger-color: #dc3545;
    --warning-color: #ffc107;
    --info-color: #0dcaf0;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --card-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    --card-shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.15);
    --transition-speed: 0.3s;
    --border-radius: 12px;
    --spacing-unit: 1rem;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    background-attachment: fixed;
}

.container {
    margin: 0 auto;
    padding: 0 15px;
}

/* Main content area with fade-in animation */
main.container {
    animation: fadeIn 0.5s ease-in;
}

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

/* Modern Form Styles */
.modern-form {
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modern-form .form-control,
.modern-form .form-select {
    border-radius: 8px;
    border: 2px solid #e0e0e0;
    padding: 0.75rem;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.modern-form .form-control:focus,
.modern-form .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.15);
    transform: translateY(-2px);
}

.modern-form .form-floating > .form-control:focus ~ label,
.modern-form .form-floating > .form-control:not(:placeholder-shown) ~ label {
    color: var(--primary-color);
    font-weight: 600;
}

.modern-form .form-label {
    color: #495057;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.modern-form .form-text {
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

.modern-form .form-group {
    margin-bottom: 1rem;
}

/* Form error styling */
.modern-form .invalid-feedback,
.modern-form .form-error-message {
    display: block;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Button improvements */
.btn {
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active {
    transform: translateY(0);
}

.btn-lg {
    padding: 0.75rem 2rem;
    font-size: 1.1rem;
}

.btn-success {
    background: linear-gradient(135deg, #198754 0%, #146c43 100%);
}

.btn-danger {
    background: linear-gradient(135deg, #dc3545 0%, #bb2d3b 100%);
}

.btn-primary {
    background: linear-gradient(135deg, #0d6efd 0%, #0a58ca 100%);
}

.btn-outline-secondary {
    border: 2px solid #6c757d;
    color: #6c757d;
    background: transparent;
}

.btn-outline-secondary:hover {
    background: #6c757d;
    color: white;
}

/* Alert improvements */
.alert {
    border-radius: var(--border-radius);
    border: none;
    padding: 1rem 1.25rem;
}

.alert-info {
    background-color: #cfe2ff;
    color: #084298;
}

.alert-warning {
    background-color: #fff3cd;
    color: #664d03;
}

/* Modern Card Styles */
.card {
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    transition: all var(--transition-speed) ease;
    background: white;
    overflow: hidden;
}

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

.card-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a58ca 100%);
    color: white;
    border: none;
    font-weight: 600;
    padding: 1rem 1.5rem;
}

/* Box styling (legacy support) */
.box {
    padding: 20px;
    margin-bottom: 20px;
    border: none;
    border-radius: var(--border-radius);
    box-shadow: var(--card-shadow);
    background: white;
    transition: all var(--transition-speed) ease;
}

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

.box h2 {
    margin-top: 0;
    color: var(--dark-color);
    font-weight: 600;
}

.box p {
    margin-bottom: 10px;
}

.green {
    background: linear-gradient(135deg, #C8E6C9 0%, #a5d6a7 100%);
}

.red {
    background: linear-gradient(135deg, #FFCDD2 0%, #ef9a9a 100%);
}

/* Canvas/Chart Responsiveness */
canvas {
    max-width: 100%;
    height: auto !important;
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Section styling */
section {
    animation: slideUp 0.6s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Table improvements */
.table {
    background: white;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--card-shadow);
}

.table thead {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a58ca 100%);
    color: white;
}

.table thead th {
    border: none;
    font-weight: 600;
    padding: 1rem;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.5px;
}

.table tbody tr {
    transition: all var(--transition-speed) ease;
}

.table tbody tr:hover {
    background-color: rgba(13, 110, 253, 0.05);
    transform: scale(1.01);
}

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

/* Buttons */
.btn {
    border-radius: 8px;
    padding: 0.5rem 1.5rem;
    font-weight: 500;
    transition: all var(--transition-speed) ease;
    border: none;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0a58ca 100%);
}

.btn-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #146c43 100%);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #b02a37 100%);
}

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}

a:hover {
    color: #0a58ca;
    text-decoration: none;
}

/* Footer */
footer {
    background: linear-gradient(135deg, #212529 0%, #343a40 100%);
    margin-top: 3rem;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.1);
}

/* Badge improvements */
.badge {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    font-weight: 500;
}

/* Responsive utilities */
@media (max-width: 768px) {
    .container {
        padding: 0 10px;
    }
    
    main.container {
        margin-top: 1rem;
        margin-bottom: 1rem;
    }
    
    h1 {
        font-size: 1.75rem;
    }
    
    h2 {
        font-size: 1.5rem;
    }
    
    h3 {
        font-size: 1.25rem;
    }
    
    .table {
        font-size: 0.875rem;
    }
    
    .card {
        margin-bottom: 1rem;
    }
}

@media (max-width: 576px) {
    .btn {
        padding: 0.4rem 1rem;
        font-size: 0.875rem;
    }
    
    .badge {
        padding: 0.35rem 0.5rem;
        font-size: 0.75rem;
    }
}