/* CSS Variables for Color Palette */
:root {
    --primary-color: #05386B;
    --secondary-color: #379683;
    --accent-color: #5CDB95;
    --light-accent: #8EE4AF;
    --background-light: #EDF5E1;
    --text-dark: #2c3e50;
    --text-light: #ffffff;
    --gradient-primary: linear-gradient(135deg, #05386B 0%, #379683 100%);
    --gradient-secondary: linear-gradient(135deg, #379683 0%, #5CDB95 100%);
    --gradient-accent: linear-gradient(135deg, #5CDB95 0%, #8EE4AF 100%);
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 25px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --background-light: #1a1a1a;
    --text-dark: #ffffff;
    --primary-color: #2c5aa0;
    --secondary-color: #4a9b8e;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--background-light);
    color: var(--text-dark);
    line-height: 1.6;
    transition: var(--transition);
}

/* Navigation */
.navbar {
    background: var(--gradient-primary) !important;
    box-shadow: var(--shadow-medium);
    padding: 1rem 0;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
}

.navbar .btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.3);
}

/* Offcanvas Menu */
.offcanvas {
    background: var(--gradient-primary);
    color: var(--text-light);
}

.offcanvas-header {
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.offcanvas .nav-link {
    color: var(--text-light);
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius);
    margin-bottom: 0.5rem;
    transition: var(--transition);
}

.offcanvas .nav-link:hover,
.offcanvas .nav-link.active {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-light);
}

/* Cards */
.card {
    border: none;
    border-radius: var(--border-radius);
    background: var(--text-light);
    transition: var(--transition);
}

[data-theme="dark"] .card {
    background: #2d3748;
    color: var(--text-light);
}

.card-header {
    background: var(--gradient-secondary);
    color: var(--text-light);
    border-radius: var(--border-radius) var(--border-radius) 0 0 !important;
    border: none;
    padding: 1.25rem;
}

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

/* Forms */
.form-control,
.form-select {
    border: 2px solid #e2e8f0;
    border-radius: var(--border-radius);
    padding: 0.75rem 1rem;
    transition: var(--transition);
    background: var(--text-light);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background: #4a5568;
    border-color: #4a5568;
    color: var(--text-light);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(92, 219, 149, 0.25);
}

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

[data-theme="dark"] .form-label {
    color: var(--text-light);
}

/* Buttons */
.btn {
    border-radius: var(--border-radius);
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: var(--gradient-secondary);
    border: none;
}

.btn-primary:hover {
    background: var(--gradient-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-light);
}

.btn-outline-secondary {
    border: 2px solid var(--secondary-color);
    color: var(--secondary-color);
    background: transparent;
}

.btn-outline-secondary:hover {
    background: var(--secondary-color);
    color: var(--text-light);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* Results Section */
#results {
    padding: 2rem;
}

.result-item {
    background: var(--gradient-accent);
    color: var(--text-dark);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    text-align: center;
    box-shadow: var(--shadow-light);
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    display: block;
}

.result-label {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

/* Chart Container */
#chartContainer {
    animation: slideUp 0.5s ease-out;
}

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

/* Ad Banner */
.ad-banner {
    background: linear-gradient(45deg, #f8f9fa, #e9ecef);
    border: 2px dashed #dee2e6;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

[data-theme="dark"] .ad-banner {
    background: linear-gradient(45deg, #2d3748, #4a5568);
    border-color: #4a5568;
}

/* Modals */
.modal-content {
    border-radius: var(--border-radius);
    border: none;
    box-shadow: var(--shadow-medium);
}

[data-theme="dark"] .modal-content {
    background: #2d3748;
    color: var(--text-light);
}

.modal-header {
    background: var(--gradient-primary);
    color: var(--text-light);
    border-radius: var(--border-radius) var(--border-radius) 0 0;
    border: none;
}

/* Footer */
.footer {
    background: var(--gradient-primary);
    color: var(--text-light);
    margin-top: auto;
}

.footer a {
    color: var(--accent-color);
}

.footer a:hover {
    color: var(--light-accent);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .card-body {
        padding: 1rem;
    }
    
    .result-value {
        font-size: 1.5rem;
    }
    
    .btn-lg {
        padding: 0.75rem 1.5rem;
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .navbar-brand {
        font-size: 1.25rem;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .card-header h2,
    .card-header h3 {
        font-size: 1.1rem;
    }
    
    #results {
        padding: 1rem;
    }
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--text-light);
    animation: spin 1s ease-in-out infinite;
}

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

/* Form Validation */
.form-control.is-invalid {
    border-color: #dc3545;
}

.form-control.is-valid {
    border-color: var(--accent-color);
}

.invalid-feedback {
    display: block;
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

/* Accessibility */
.btn:focus,
.form-control:focus,
.form-select:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .navbar,
    .offcanvas,
    .ad-banner,
    .btn {
        display: none !important;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
    
    body {
        background: white;
        color: black;
    }
}

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

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

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

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

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

/* Utility Classes */
.text-gradient {
    background: var(--gradient-secondary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.bg-gradient-primary {
    background: var(--gradient-primary);
}

.bg-gradient-secondary {
    background: var(--gradient-secondary);
}

.bg-gradient-accent {
    background: var(--gradient-accent);
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

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