/* ===================================
   VARIABLES CSS & CONFIGURATION
   =================================== */
:root {
    /* Couleurs principales */
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #60a5fa;
    
    /* Couleurs de risque */
    --risk-very-high: #dc2626;
    --risk-high: #ea580c;
    --risk-moderate: #facc15;
    --risk-low: #16a34a;
    
    /* Couleurs de fond */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    
    /* Couleurs de texte */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    
    /* Couleurs système */
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --info: #3b82f6;
    
    /* Ombres */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    
    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
    
    /* Layout */
    --sidebar-width: 280px;
    --header-height: 64px;
}

/* Mode sombre */
[data-theme="dark"] {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #64748b;
}

/* ===================================
   RESET & BASE STYLES
   =================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ===================================
   BANNIÈRE NOUVEAUTÉS
   =================================== */
.update-banner {
    background: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    color: white;
    padding: 0.75rem;
    text-align: center;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    animation: slideDown 0.5s ease;
}

.update-banner i {
    font-size: 1.2rem;
    animation: sparkle 2s ease infinite;
}

@keyframes sparkle {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

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

/* ===================================
   HEADER
   =================================== */
.header {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--bg-tertiary);
    height: var(--header-height);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    padding: 0 var(--spacing-lg);
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
}

.logo h1 {
    font-size: 1.25rem;
    font-weight: 700;
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.btn-icon {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.menu-toggle {
    display: none;
}

/* ===================================
   SIDEBAR NAVIGATION
   =================================== */
.sidebar {
    position: fixed;
    left: 0;
    top: calc(var(--header-height) + 45px);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height) - 45px);
    background: var(--bg-primary);
    border-right: 1px solid var(--bg-tertiary);
    overflow-y: auto;
    z-index: 90;
    transition: transform var(--transition-normal);
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.sidebar-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.close-sidebar {
    display: none;
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: var(--radius-sm);
}

.close-sidebar:hover {
    background: var(--bg-tertiary);
}

.nav-menu {
    list-style: none;
    padding: var(--spacing-md);
}

.nav-item {
    margin-bottom: var(--spacing-xs);
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-item a i {
    width: 20px;
    font-size: 1.125rem;
}

.nav-item a:hover {
    background: var(--bg-secondary);
    color: var(--primary-color);
}

.nav-item.active a {
    background: var(--primary-color);
    color: white;
    font-weight: 600;
}

.badge-new {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: white;
    font-size: 0.625rem;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-left: auto;
    animation: pulse 2s ease infinite;
}

.badge-new-small {
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    color: white;
    font-size: 0.5rem;
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-left: 0.5rem;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.sidebar-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--bg-tertiary);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

/* ===================================
   MAIN CONTENT
   =================================== */
.main-content {
    margin-left: var(--sidebar-width);
    padding: var(--spacing-2xl);
    min-height: calc(100vh - var(--header-height) - 45px);
    max-width: 1200px;
}

.section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.section.active {
    display: block;
}

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

.section-header {
    margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

/* ===================================
   CARDS & CONTAINERS
   =================================== */
.welcome-card,
.calculator-card,
.info-card,
.result-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-xl);
}

.welcome-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.welcome-header i {
    font-size: 4rem;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.welcome-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.welcome-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

/* ===================================
   FEATURES GRID
   =================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.feature-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    border: 2px solid transparent;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    position: relative;
}

.feature-icon i {
    font-size: 2rem;
    color: white;
}

.feature-icon.new-badge::after {
    content: '';
    position: absolute;
    top: -5px;
    right: -5px;
    width: 20px;
    height: 20px;
    background: linear-gradient(135deg, #8b5cf6, #ec4899);
    border-radius: 50%;
    animation: pulse 2s ease infinite;
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ===================================
   BUTTONS
   =================================== */
.btn-primary,
.btn-secondary,
.btn-calculate,
.quick-link-btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-calculate {
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: white;
    padding: 1rem 2rem;
    font-size: 1.125rem;
    margin-top: var(--spacing-xl);
}

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

/* ===================================
   FORMS
   =================================== */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.form-group label i {
    color: var(--primary-color);
}

.form-group input,
.form-group select {
    padding: 0.75rem;
    border: 2px solid var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-size: 1rem;
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group small {
    margin-top: var(--spacing-xs);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.slider {
    margin-top: var(--spacing-sm);
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--bg-tertiary);
    outline: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

.radio-group,
.checkbox-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.radio-label,
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.radio-label:hover,
.checkbox-label:hover {
    background: var(--bg-secondary);
}

.radio-label input,
.checkbox-label input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

/* ===================================
   MODIFICATEURS SECTION
   =================================== */
.modificateurs-section {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
}

.modificateurs-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--warning);
}

.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

/* ===================================
   KEY UPDATES & LISTS
   =================================== */
.key-updates {
    background: linear-gradient(135deg, rgba(139, 92, 246, 0.1), rgba(236, 72, 153, 0.1));
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin: var(--spacing-xl) 0;
    border: 2px solid rgba(139, 92, 246, 0.2);
}

.key-updates h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.updates-list {
    list-style: none;
}

.updates-list li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.updates-list li:last-child {
    border-bottom: none;
}

.updates-list i {
    color: var(--success);
    margin-top: 0.25rem;
    font-size: 1.125rem;
}

/* ===================================
   QUICK START
   =================================== */
.quick-start {
    margin: var(--spacing-2xl) 0;
}

.quick-start h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.quick-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.quick-link-btn {
    background: white;
    border: 2px solid var(--bg-tertiary);
    padding: var(--spacing-lg);
    flex-direction: column;
    text-align: center;
    gap: var(--spacing-md);
}

.quick-link-btn i {
    font-size: 2rem;
    color: var(--primary-color);
}

.quick-link-btn:hover {
    border-color: var(--primary-color);
    background: var(--bg-secondary);
}

/* ===================================
   INFO BANNERS
   =================================== */
.info-banner {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin: var(--spacing-xl) 0;
}

.info-banner.info {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    color: var(--info);
}

.info-banner.warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--warning);
}

.info-banner.error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
}

.info-banner i {
    font-size: 1.5rem;
    margin-top: 0.125rem;
}

.info-banner strong {
    display: block;
    margin-bottom: var(--spacing-xs);
}

/* ===================================
   RESULT CARD
   =================================== */
.result-card {
    margin-top: var(--spacing-xl);
    border: 2px solid var(--primary-color);
}

.result-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: var(--spacing-lg);
    border-bottom: 2px solid var(--bg-tertiary);
    margin-bottom: var(--spacing-lg);
}

.risk-badge {
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: 1.125rem;
}

.risk-badge.very-high {
    background: var(--risk-very-high);
    color: white;
}

.risk-badge.high {
    background: var(--risk-high);
    color: white;
}

.risk-badge.moderate {
    background: var(--risk-moderate);
    color: #000;
}

.risk-badge.low {
    background: var(--risk-low);
    color: white;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background: var(--bg-primary);
    border-top: 1px solid var(--bg-tertiary);
    padding: var(--spacing-2xl);
    margin-left: var(--sidebar-width);
    margin-top: var(--spacing-2xl);
}

.footer-content {
    max-width: 1200px;
    text-align: center;
    color: var(--text-secondary);
}

.footer-content p {
    margin-bottom: var(--spacing-sm);
}

.disclaimer {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(245, 158, 11, 0.1);
    border-radius: var(--radius-md);
    color: var(--warning);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* ===================================
   MODAL
   =================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.close-modal {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.close-modal:hover {
    background: var(--error);
    color: white;
}

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

.modal-body h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: var(--spacing-lg) 0 var(--spacing-md);
}

.modal-body ol,
.modal-body ul {
    padding-left: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.modal-body li {
    margin-bottom: var(--spacing-sm);
}

kbd {
    background: var(--bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-family: monospace;
    font-size: 0.875rem;
}

/* ===================================
   OVERLAY
   =================================== */
.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 80;
}

.overlay.active {
    display: block;
}

/* ===================================
   RESPONSIVE DESIGN
   =================================== */
@media (max-width: 1024px) {
    .main-content,
    .footer {
        margin-left: 0;
    }
    
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.active {
        transform: translateX(0);
    }
    
    .menu-toggle,
    .close-sidebar {
        display: flex;
    }
}

@media (max-width: 768px) {
    :root {
        --spacing-2xl: 2rem;
    }
    
    .main-content {
        padding: var(--spacing-lg);
    }
    
    .section-header h2 {
        font-size: 1.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .logo h1 {
        font-size: 1rem;
    }
    
    .quick-links {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0 var(--spacing-md);
    }
    
    .main-content {
        padding: var(--spacing-md);
    }
    
    .welcome-card,
    .calculator-card {
        padding: var(--spacing-lg);
    }
    
    .update-banner {
        font-size: 0.875rem;
    }
}

/* ===================================
   PRINT STYLES
   =================================== */
@media print {
    .header,
    .sidebar,
    .footer,
    .update-banner,
    .menu-toggle,
    .overlay {
        display: none !important;
    }
    
    .main-content {
        margin-left: 0;
        padding: 0;
    }
    
    .section {
        page-break-inside: avoid;
    }
    
    * {
        box-shadow: none !important;
    }
}

/* ===================================
   UTILITY CLASSES
   =================================== */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-muted); }
.font-bold { font-weight: 700; }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mt-lg { margin-top: var(--spacing-lg); }
.hidden { display: none; }
.visible { display: block; }