/* Swiss Style Design - Clean, Minimal, Functional */
:root {
    /* Color Palette */
    --primary-color: #2196F3;
    --success-color: #4CAF50;
    --warning-color: #FFC107;
    --danger-color: #F44336;
    --purple-color: #9C27B0;
    
    /* Swiss Style Typography */
    --font-primary: 'Helvetica Neue', Arial, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 3rem;
    
    /* Swiss Style Grid */
    --grid-unit: 24px;
    
    /* Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --border-color: #dee2e6;
}

/* Dark Theme Variables */
[data-bs-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --border-color: #495057;
}

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

body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Swiss Style Typography Hierarchy */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-light);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

/* Swiss Style Grid System Enhancement */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navigation - Clean Swiss Style */
.navbar {
    background-color: var(--bg-primary) !important;
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: var(--font-weight-bold);
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: var(--font-weight-regular);
    color: var(--text-primary) !important;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--primary-color) !important;
}

/* Hero Section - Swiss Style Minimalism */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
    min-height: 60vh;
    display: flex;
    align-items: center;
    position: relative;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    opacity: 0.3;
}

/* Cards - Swiss Style Clean Design */
.card {
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    background-color: var(--bg-primary);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.card-header {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    font-weight: var(--font-weight-bold);
}

/* Activity Cards - Swiss Grid System */
.activity-card {
    background-color: var(--bg-secondary);
    border-radius: 8px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.activity-card:hover {
    background-color: var(--bg-primary);
    border-color: var(--primary-color);
}

.activity-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

/* Form Elements - Swiss Style Precision */
.form-control {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(33, 150, 243, 0.25);
}

.form-label {
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

/* Buttons - Swiss Style Functional Design */
.btn {
    border-radius: 4px;
    font-weight: var(--font-weight-bold);
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: #1976D2;
    transform: translateY(-1px);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    background-color: #388E3C;
}

.btn-warning {
    background-color: var(--warning-color);
    color: #212529;
}

.btn-warning:hover {
    background-color: #F57F17;
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover {
    background-color: #D32F2F;
}

.btn-info {
    background-color: var(--primary-color);
    color: white;
}

.btn-info:hover {
    background-color: #1976D2;
}

/* Result Cards - Swiss Style Data Presentation */
.result-card {
    background: linear-gradient(135deg, var(--bg-primary), var(--bg-secondary));
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.result-card:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.result-card h4 {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

/* Consumption Level Styling */
.level-low {
    background: linear-gradient(135deg, var(--success-color), #66BB6A) !important;
    color: white !important;
}

.level-medium {
    background: linear-gradient(135deg, var(--warning-color), #FFCA28) !important;
    color: #212529 !important;
}

.level-high {
    background: linear-gradient(135deg, var(--danger-color), #EF5350) !important;
    color: white !important;
}

/* Charts Container */
.chart-container {
    position: relative;
    height: 300px;
    margin: var(--spacing-md) 0;
}

/* Tips Section - Swiss Style Information Design */
.tips-container {
    background-color: var(--bg-secondary);
    border-left: 4px solid var(--warning-color);
    padding: var(--spacing-lg);
    margin: var(--spacing-md) 0;
}

.tip-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background-color: var(--bg-primary);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.tip-icon {
    font-size: 1.5rem;
    margin-right: var(--spacing-md);
    color: var(--primary-color);
    flex-shrink: 0;
}

/* Accordion - Swiss Style Collapsible Content */
.accordion-item {
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
}

.accordion-button {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
}

.accordion-button:not(.collapsed) {
    background-color: var(--primary-color);
    color: white;
}

.accordion-body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Offcanvas - Swiss Style Side Panel */
.offcanvas {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-left: 1px solid var(--border-color);
}

.offcanvas-header {
    border-bottom: 1px solid var(--border-color);
}

/* Modal - Swiss Style Dialog */
.modal-content {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal-header {
    border-bottom: 1px solid var(--border-color);
}

.modal-footer {
    border-top: 1px solid var(--border-color);
}

/* Footer - Swiss Style Minimal Footer */
footer {
    background-color: #212529 !important;
    color: white;
    margin-top: auto;
}

footer a {
    color: var(--warning-color);
    text-decoration: none;
    font-weight: var(--font-weight-bold);
}

footer a:hover {
    color: #FFD54F;
    text-decoration: underline;
}

/* Theme Toggle */
#themeToggle {
    border: 1px solid var(--border-color);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

#themeToggle:hover {
    background-color: var(--bg-secondary);
}

/* Responsive Design - Mobile First Approach */
/* Mobile Styles (320px and up) */
@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .activity-card {
        padding: var(--spacing-md);
    }
    
    .activity-card .row {
        text-align: center;
    }
    
    .activity-card .col-md-2,
    .activity-card .col-md-6,
    .activity-card .col-md-4 {
        margin-bottom: var(--spacing-sm);
    }
    
    .result-card h4 {
        font-size: 1.5rem;
    }
    
    .btn-lg {
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 1rem;
    }
}

/* Tablet Styles (768px and up) */
@media (min-width: 768px) {
    .activity-card .row {
        align-items: center;
    }
    
    .result-card h4 {
        font-size: 2rem;
    }
}

/* Desktop Styles (992px and up) */
@media (min-width: 992px) {
    .hero-section {
        min-height: 70vh;
    }
    
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Large Desktop Styles (1200px and up) */
@media (min-width: 1200px) {
    .hero-section h1 {
        font-size: 3.5rem;
    }
    
    .activity-card {
        padding: var(--spacing-xl);
    }
}

/* High DPI Displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    .card {
        box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    }
    
    .card:hover {
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
    }
}

/* Print Styles */
@media print {
    .navbar,
    .btn,
    .offcanvas,
    .modal,
    footer {
        display: none !important;
    }
    
    .hero-section {
        background: white !important;
        color: black !important;
    }
    
    .card {
        border: 1px solid #000 !important;
        box-shadow: none !important;
    }
}

/* Accessibility Enhancements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus Styles for Accessibility */
.btn:focus,
.form-control:focus,
.nav-link:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .card {
        border: 2px solid var(--text-primary);
    }
    
    .btn {
        border: 2px solid currentColor;
    }
}

/* Loading States */
.loading {
    opacity: 0.6;
    pointer-events: none;
    position: relative;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid var(--primary-color);
    border-radius: 50%;
    border-top-color: transparent;
    animation: spin 1s linear infinite;
}

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

/* Utility Classes - Swiss Style Helpers */
.text-swiss {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-light);
    letter-spacing: -0.02em;
}

.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--purple-color));
}

.bg-gradient-success {
    background: linear-gradient(135deg, var(--success-color), #66BB6A);
}

.bg-gradient-warning {
    background: linear-gradient(135deg, var(--warning-color), #FFCA28);
}

.bg-gradient-danger {
    background: linear-gradient(135deg, var(--danger-color), #EF5350);
}

.shadow-swiss {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.border-swiss {
    border: 1px solid var(--border-color);
}

/* 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-up {
    animation: slideUp 0.5s ease-out;
}

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

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: #1976D2;
}

/* Selection Styling */
::selection {
    background-color: var(--primary-color);
    color: white;
}

::-moz-selection {
    background-color: var(--primary-color);
    color: white;
}