/* Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-blue: #2196F3;
    --success-green: #4CAF50;
    --warning-yellow: #FFC107;
    --danger-red: #F44336;
    --secondary-purple: #9C27B0;
    
    /* Swiss Style Typography */
    --font-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bs-body-bg: #121212;
    --bs-body-color: #ffffff;
    --bs-light: #1e1e1e;
    --bs-dark: #ffffff;
}

/* Typography - Swiss Style */
body {
    font-family: var(--font-primary);
    font-weight: var(--font-weight-regular);
    line-height: 1.6;
    color: #333;
    background-color: #ffffff;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-light);
}

/* Navigation */
.navbar {
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(10px);
}

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

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--success-green) 100%);
    color: white;
    min-height: 60vh;
    display: flex;
    align-items: center;
}

.hero-section h1 {
    font-weight: var(--font-weight-bold);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-section .lead {
    font-weight: var(--font-weight-light);
    opacity: 0.9;
}

.hero-stats .stat-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: transform var(--transition-fast);
}

.hero-stats .stat-card:hover {
    transform: translateY(-2px);
}

/* Material Cards */
.material-card {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: none;
    transition: all var(--transition-normal);
    overflow: hidden;
}

.material-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.material-card .card-header {
    background: linear-gradient(45deg, var(--primary-blue), var(--success-green));
    color: white;
    border: none;
    padding: var(--spacing-lg);
}

.material-card .card-body {
    padding: var(--spacing-lg);
}

.material-card .form-label {
    font-weight: var(--font-weight-medium);
    color: #555;
    margin-bottom: var(--spacing-sm);
}

.material-card .form-control,
.material-card .form-range {
    border-radius: 8px;
    border: 2px solid #e9ecef;
    transition: border-color var(--transition-fast);
}

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

/* Range Input Styling */
.form-range {
    height: 6px;
    background: #e9ecef;
}

.form-range::-webkit-slider-thumb {
    background: var(--primary-blue);
    border: none;
    width: 20px;
    height: 20px;
}

.form-range::-moz-range-thumb {
    background: var(--primary-blue);
    border: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
}

/* Value Display */
.value-display {
    background: var(--primary-blue);
    color: white;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 20px;
    font-weight: var(--font-weight-medium);
    font-size: 0.875rem;
    min-width: 40px;
    text-align: center;
}

/* Result Cards */
.result-card {
    background: white;
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    border: none;
    transition: all var(--transition-normal);
    height: 100%;
}

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

.result-card i {
    opacity: 0.8;
}

.result-card h4 {
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-sm);
}

/* Chart Containers */
.chart-container {
    background: white;
    padding: var(--spacing-lg);
    border-radius: 16px;
    box-shadow: var(--shadow-sm);
    height: 400px;
}

/* Buttons */
.btn {
    border-radius: 8px;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-sm) var(--spacing-lg);
    transition: all var(--transition-fast);
    border: none;
}

.btn-primary {
    background: var(--primary-blue);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: #1976D2;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-success {
    background: var(--success-green);
    box-shadow: var(--shadow-sm);
}

.btn-success:hover {
    background: #388E3C;
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.125rem;
}

/* Accordion */
.accordion-item {
    border: none;
    margin-bottom: var(--spacing-sm);
    border-radius: 12px !important;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.accordion-button {
    background: white;
    border: none;
    font-weight: var(--font-weight-medium);
    padding: var(--spacing-lg);
}

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

.accordion-button:focus {
    box-shadow: none;
    border: none;
}

.accordion-body {
    padding: var(--spacing-lg);
    background: #f8f9fa;
}

/* Modal */
.modal-content {
    border-radius: 16px;
    border: none;
    box-shadow: var(--shadow-lg);
}

.modal-header {
    border-bottom: 1px solid #e9ecef;
    padding: var(--spacing-lg);
}

.modal-body {
    padding: var(--spacing-lg);
}

/* Offcanvas */
.offcanvas {
    border: none;
    box-shadow: var(--shadow-lg);
}

.offcanvas-header {
    border-bottom: 1px solid #e9ecef;
    padding: var(--spacing-lg);
}

.offcanvas-body {
    padding: var(--spacing-lg);
}

/* Tips Cards */
.tip-card {
    background: white;
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--success-green);
}

.tip-card h6 {
    color: var(--success-green);
    font-weight: var(--font-weight-bold);
}

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

.spinner-border-sm {
    width: 1rem;
    height: 1rem;
}

/* Dark Theme Styles */
[data-theme="dark"] {
    background-color: #121212;
    color: #ffffff;
}

[data-theme="dark"] .navbar {
    background-color: #1e1e1e !important;
}

[data-theme="dark"] .material-card,
[data-theme="dark"] .result-card,
[data-theme="dark"] .chart-container {
    background-color: #1e1e1e;
    color: #ffffff;
}

[data-theme="dark"] .accordion-body {
    background-color: #2d2d2d;
}

[data-theme="dark"] .form-control {
    background-color: #2d2d2d;
    border-color: #404040;
    color: #ffffff;
}

[data-theme="dark"] .form-control:focus {
    background-color: #2d2d2d;
    border-color: var(--primary-blue);
    color: #ffffff;
}

[data-theme="dark"] .bg-light {
    background-color: #1e1e1e !important;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        min-height: 50vh;
        text-align: center;
    }
    
    .hero-section h1 {
        font-size: 2rem;
    }
    
    .hero-section .lead {
        font-size: 1rem;
    }
    
    .hero-stats {
        margin-top: var(--spacing-xl);
    }
    
    .material-card .card-header {
        padding: var(--spacing-md);
    }
    
    .material-card .card-body {
        padding: var(--spacing-md);
    }
    
    .result-card {
        margin-bottom: var(--spacing-md);
    }
    
    .chart-container {
        height: 300px;
        padding: var(--spacing-md);
    }
    
    .btn-lg {
        padding: var(--spacing-sm) var(--spacing-lg);
        font-size: 1rem;
    }
}

@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 1.75rem;
    }
    
    .display-4 {
        font-size: 1.75rem;
    }
    
    .container {
        padding-left: var(--spacing-md);
        padding-right: var(--spacing-md);
    }
    
    .chart-container {
        height: 250px;
    }
}

/* 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 0.3s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Utility Classes */
.text-gradient {
    background: linear-gradient(45deg, var(--primary-blue), var(--success-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.border-gradient {
    border: 2px solid;
    border-image: linear-gradient(45deg, var(--primary-blue), var(--success-green)) 1;
}

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

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

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

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

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

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