/*
═══════════════════════════════════════════════════════════════════════════════
SuperCOMPTABLE 2026
Feuille de styles principale - Version UX Optimisée
═══════════════════════════════════════════════════════════════════════════════
*/

/* ═══════════════════════════════════════════════════════════════════════════
   VARIABLES CSS
═══════════════════════════════════════════════════════════════════════════ */
:root {
    /* Couleurs principales */
    --primary: #7C3AED;
    --primary-dark: #6D28D9;
    --primary-light: #A78BFA;
    --primary-bg: rgba(124, 58, 237, 0.1);

    /* Couleurs sémantiques */
    --info: #3B82F6;
    --info-dark: #1d4ed8;
    --info-light: #60A5FA;
    --info-bg: rgba(59, 130, 246, 0.1);
    
    --success: #10B981;
    --success-dark: #059669;
    --success-light: #34D399;
    --success-bg: rgba(16, 185, 129, 0.1);
    
    --warning: #F59E0B;
    --warning-dark: #D97706;
    --warning-light: #FBBF24;
    --warning-bg: rgba(245, 158, 11, 0.1);
    
    --error: #EF4444;
    --error-dark: #DC2626;
    --error-light: #F87171;
    --error-bg: rgba(239, 68, 68, 0.1);
    
    --pink: #EC4899;
    --pink-dark: #BE185D;
    --pink-light: #F472B6;

    /* Gris */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Backgrounds */
    --bg-primary: #FFFFFF;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);

    /* Texte */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-700);
    --text-muted: var(--gray-500);
    --text-light: var(--gray-400);

    /* Rayons */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Ombres */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    --shadow-glow: 0 0 20px rgba(124, 58, 237, 0.3);
    --shadow-glow-success: 0 0 20px rgba(16, 185, 129, 0.3);

    /* Espacements */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout */
    --sidebar-width: 300px;
    --header-height: 90px;
    --tool-max-width: 1100px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.35s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════════════════════════════════════════ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    width: 100%;
    max-width: 100%;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    background: linear-gradient(135deg, #1e3a8a 0%, #7c3aed 50%, #c026d3 100%);
    background-attachment: fixed;
    width: 100%;
    max-width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

@supports (-webkit-touch-callout: none) {
    html, body {
        min-height: -webkit-fill-available;
    }
}

img, svg, video, canvas {
    display: block;
    max-width: 100%;
    height: auto;
}

button, input, select, textarea {
    font: inherit;
    max-width: 100%;
}

button {
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
    border: none;
    background: none;
}

a {
    color: inherit;
    text-decoration: none;
}

:focus-visible {
    outline: 3px solid rgba(124, 58, 237, 0.6);
    outline-offset: 2px;
}

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

/* ═══════════════════════════════════════════════════════════════════════════
   SITE HEADER - FIXE EN HAUT
═══════════════════════════════════════════════════════════════════════════ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    border-bottom: 3px solid #e94560;
    overflow: hidden;
}

.site-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(233, 69, 96, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 50%, rgba(79, 172, 254, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.site-header::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background-image: 
        linear-gradient(30deg, transparent 40%, rgba(255,255,255,0.02) 40%, rgba(255,255,255,0.02) 60%, transparent 60%),
        linear-gradient(-30deg, transparent 40%, rgba(255,255,255,0.02) 40%, rgba(255,255,255,0.02) 60%, transparent 60%);
    background-size: 60px 100px;
    animation: headerPattern 20s linear infinite;
    pointer-events: none;
}

@keyframes headerPattern {
    0% { transform: translateX(0) translateY(0); }
    100% { transform: translateX(60px) translateY(100px); }
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0.875rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
    z-index: 2;
    gap: 1.5rem;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.header-logo {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, #e94560 0%, #ff6b6b 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 15px rgba(233, 69, 96, 0.4);
    animation: logoPulse 3s ease-in-out infinite;
    flex-shrink: 0;
}

@keyframes logoPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.header-title-group {
    display: flex;
    flex-direction: column;
}

.header-title-link {
    text-decoration: none;
}

.header-title {
    font-family: 'Inter', sans-serif;
    font-size: 1.375rem;
    font-weight: 800;
    color: #ffffff;
    margin: 0;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
    transition: opacity var(--transition-fast);
}

.header-title-link:hover .header-title {
    opacity: 0.9;
}

.header-title span {
    background: linear-gradient(90deg, #4facfe 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-badges {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.badge {
    padding: 0.375rem 0.75rem;
    border-radius: 50px;
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.65rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.badge:hover {
    transform: translateY(-2px);
}

.badge-cgi {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(16, 185, 129, 0.1) 100%);
    color: #10b981;
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.badge-pcg {
    background: linear-gradient(135deg, rgba(79, 172, 254, 0.2) 0%, rgba(79, 172, 254, 0.1) 100%);
    color: #4facfe;
    border: 1px solid rgba(79, 172, 254, 0.3);
}

.badge-2026 {
    background: linear-gradient(135deg, #e94560 0%, #ff6b6b 100%);
    color: white;
    border: none;
    box-shadow: 0 2px 10px rgba(233, 69, 96, 0.3);
}

.header-stats {
    display: flex;
    gap: 1.25rem;
    padding: 0.625rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-family: 'JetBrains Mono', monospace;
    font-size: 1.125rem;
    font-weight: 700;
    color: #4facfe;
    display: block;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.6rem;
    color: rgba(255, 255, 255, 0.6);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   SIDEBAR - MENU LATÉRAL
═══════════════════════════════════════════════════════════════════════════ */
.sidebar {
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    height: calc(100dvh - var(--header-height));
    background: linear-gradient(180deg, #111827 0%, #0f172a 100%);
    color: white;
    position: fixed;
    left: 0;
    top: var(--header-height);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition-slow);
    will-change: transform;
    border-right: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
}

.sidebar-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    flex-shrink: 0;
    background: rgba(0, 0, 0, 0.2);
}

.logo {
    font-size: 1.375rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
    color: #fff;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-sub {
    font-size: 0.8rem;
    color: var(--gray-400);
    margin: 0;
    font-weight: 500;
}

/* Search Box */
.search-box {
    padding: var(--spacing-md) var(--spacing-lg);
    position: relative;
    flex-shrink: 0;
}

.search-box .search-icon {
    position: absolute;
    left: calc(var(--spacing-lg) + 0.875rem);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1rem;
    z-index: 1;
    pointer-events: none;
    opacity: 0.6;
}

.search-box input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    background: rgba(255, 255, 255, 0.06);
    border: 2px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-normal);
    -webkit-text-fill-color: #ffffff;
    caret-color: #ffffff;
}

.search-box input::placeholder {
    color: var(--gray-500);
    -webkit-text-fill-color: var(--gray-500);
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.15);
}

/* Menu Navigation */
.menu {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    scrollbar-gutter: stable;
    padding: var(--spacing-sm) var(--spacing-md);
}

/* Custom Scrollbar */
.menu::-webkit-scrollbar {
    width: 6px;
}

.menu::-webkit-scrollbar-track {
    background: transparent;
}

.menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 3px;
}

.menu::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.25);
}

/* ═══════════════════════════════════════════════════════════════════════════
   MENU CATÉGORIES
═══════════════════════════════════════════════════════════════════════════ */
.menu-category {
    margin-bottom: var(--spacing-xs);
    overflow: hidden;
}

.category-header {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.75rem var(--spacing-md);
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    color: var(--gray-400);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all var(--transition-normal);
    width: 100%;
    text-align: left;
}

.category-header:hover {
    background: rgba(255, 255, 255, 0.05);
    color: white;
}

.category-icon {
    font-size: 1rem;
    width: 1.5rem;
    min-width: 1.5rem;
    text-align: center;
    flex-shrink: 0;
    line-height: 1;
}

.category-name {
    flex: 1;
    min-width: 0;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.category-count {
    font-size: 0.65rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--gray-400);
    padding: 0.15rem 0.5rem;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-family: 'JetBrains Mono', monospace;
    flex-shrink: 0;
    line-height: 1.4;
}

.category-arrow {
    font-size: 0.6rem;
    transition: transform var(--transition-normal);
    opacity: 0.5;
    flex-shrink: 0;
    line-height: 1;
}

.menu-category.open .category-arrow {
    transform: rotate(90deg);
}

/* ═══════════════════════════════════════════════════════════════════════════
   LISTE DES OUTILS - FERMÉE PAR DÉFAUT
═══════════════════════════════════════════════════════════════════════════ */
.category-tools {
    list-style: none;
    padding: 0;
    margin: 0;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    visibility: hidden;
    transition: 
        max-height var(--transition-slow) ease-in-out,
        opacity var(--transition-normal) ease,
        visibility 0s linear var(--transition-slow);
}

.category-tools.open {
    max-height: 2000px;
    opacity: 1;
    visibility: visible;
    transition: 
        max-height var(--transition-slow) ease-in-out,
        opacity var(--transition-normal) ease,
        visibility 0s linear 0s;
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOOL ITEMS
═══════════════════════════════════════════════════════════════════════════ */
.tool-item {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 0.75rem 0.625rem 2.25rem;
    background: transparent;
    border-radius: var(--radius-md);
    color: var(--gray-400);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    margin: 2px 0;
    border: 2px solid transparent;
    min-height: 42px;
    width: 100%;
}

.tool-item:hover {
    background: rgba(255, 255, 255, 0.06);
    color: white;
    transform: translateX(4px);
    border-color: rgba(255, 255, 255, 0.05);
}

.tool-item.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(124, 58, 237, 0.35);
    border-color: transparent;
    transform: translateX(0);
}

.tool-item.active:hover {
    transform: translateX(0);
    box-shadow: 0 6px 16px rgba(124, 58, 237, 0.45);
}

.tool-item .tool-icon {
    font-size: 1.125rem;
    width: 1.375rem;
    min-width: 1.375rem;
    text-align: center;
    flex-shrink: 0;
    line-height: 1;
    transition: transform var(--transition-fast);
}

.tool-item:hover .tool-icon {
    transform: scale(1.1);
}

.tool-item .tool-name {
    flex: 1;
    min-width: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.tool-badge-popular {
    color: var(--warning);
    font-size: 0.8rem;
    flex-shrink: 0;
    margin-left: auto;
    line-height: 1;
}

/* No results */
.no-results {
    text-align: center;
    padding: var(--spacing-2xl);
    color: var(--gray-400);
}

.no-results-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--spacing-md);
    opacity: 0.4;
}

/* Sidebar Footer */
.sidebar-footer {
    padding: var(--spacing-md) var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
    font-size: 0.75rem;
    color: var(--gray-500);
    flex-shrink: 0;
    background: rgba(0, 0, 0, 0.3);
}

.sidebar-footer p {
    margin: 0.2rem 0;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    z-index: 99;
    opacity: 0;
    transition: opacity var(--transition-slow);
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

/* ═══════════════════════════════════════════════════════════════════════════
   MAIN CONTENT
═══════════════════════════════════════════════════════════════════════════ */
.main-content {
    margin-left: var(--sidebar-width);
    padding-top: calc(var(--header-height) + var(--spacing-xl));
    width: calc(100% - var(--sidebar-width));
    max-width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
    padding-bottom: calc(var(--spacing-2xl) + env(safe-area-inset-bottom, 0px));
}

.mobile-header {
    display: none;
}

.tool-container {
    width: 100%;
    max-width: var(--tool-max-width);
    margin: 0 auto;
}

/* ═══════════════════════════════════════════════════════════════════════════
   WELCOME SCREEN
═══════════════════════════════════════════════════════════════════════════ */
.welcome-screen {
    color: white;
    padding: var(--spacing-lg) 0;
}

.welcome-hero {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: rgba(255, 255, 255, 0.04);
    border-radius: var(--radius-2xl);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-2xl);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
}

.welcome-icon {
    font-size: 4.5rem;
    margin-bottom: var(--spacing-lg);
    animation: bounce 2s ease-in-out infinite;
    filter: drop-shadow(0 4px 8px rgba(0,0,0,0.2));
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.welcome-hero h1 {
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #ffffff 0%, #c7d2fe 50%, #a5b4fc 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.welcome-subtitle {
    font-size: 1.125rem;
    opacity: 0.85;
    max-width: 550px;
    margin: 0 auto;
    line-height: 1.7;
}

/* Welcome Stats */
.welcome-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    flex-wrap: wrap;
}

.welcome-stat {
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-xl);
    background: rgb(46 51 98 / 99%);
    border-radius: var(--radius-xl);
    min-width: 130px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all var(--transition-normal);
    backdrop-filter: blur(8px);
}

.welcome-stat:hover {
    transform: translateY(-6px);
    background: #F96268;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.welcome-stat .stat-value {
    font-family: 'JetBrains Mono', monospace;
    font-size: 2.25rem;
    font-weight: 800;
    display: block;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-stat .stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    opacity: 0.7;
    margin-top: var(--spacing-xs);
    font-weight: 600;
}

/* Quick Access Section */
.welcome-quick-access,
.welcome-categories {
    margin-bottom: var(--spacing-2xl);
}

.welcome-quick-access h2,
.welcome-categories h2 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Quick Tools Grid */
.quick-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.quick-tool-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: rgb(78 20 20);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.quick-tool-card:hover {
    background: #4CA0EC;
    transform: translateY(-4px);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.2);
}

.quick-tool-card:active {
    transform: translateY(-2px);
}

.quick-tool-icon {
    font-size: 2rem;
    transition: transform var(--transition-fast);
}

.quick-tool-card:hover .quick-tool-icon {
    transform: scale(1.1);
}

.quick-tool-name {
    font-weight: 600;
    font-size: 0.95rem;
    line-height: 1.3;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--spacing-md);
}

.category-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-xl) var(--spacing-lg);
    background: rgba(0, 48, 110, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.category-card:hover {
    background: #10B67F;
    transform: translateY(-6px);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.2);
}

.category-card-icon {
    font-size: 2.75rem;
    margin-bottom: var(--spacing-xs);
    transition: transform var(--transition-normal);
}

.category-card:hover .category-card-icon {
    transform: scale(1.15);
}

.category-card-name {
    font-weight: 700;
    font-size: 1rem;
}

.category-card-count {
    font-size: 0.8rem;
    opacity: 0.6;
    font-weight: 500;
}

/* ═══════════════════════════════════════════════════════════════════════════
   TOOL CARDS
═══════════════════════════════════════════════════════════════════════════ */
.tool-card {
    background: white;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin-bottom: var(--spacing-xl);
}

.tool-card-header {
    padding: var(--spacing-lg) var(--spacing-xl);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    color: white;
}

.tool-card-header .icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.tool-card-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 0 0.25rem 0;
}

.tool-card-header p {
    font-size: 0.9rem;
    opacity: 0.9;
    margin: 0;
}

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

/* Tool Header */
.tool-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: white;
}

.tool-header h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.tool-header p {
    font-size: 1.05rem;
    opacity: 0.9;
}

.tool-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    margin-top: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #000;
}

/* ═══════════════════════════════════════════════════════════════════════════
   INPUT SECTIONS
═══════════════════════════════════════════════════════════════════════════ */
.input-section {
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 2px solid;
    position: relative;
    overflow: hidden;
}

.input-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: inherit;
    border: none;
}

.input-section.blue {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    border-color: var(--info);
}
.input-section.blue::before { background: var(--info); }

.input-section.green {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
    border-color: var(--success);
}
.input-section.green::before { background: var(--success); }

.input-section.orange {
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
    border-color: var(--warning);
}
.input-section.orange::before { background: var(--warning); }

.input-section.pink {
    background: linear-gradient(135deg, #FDF2F8 0%, #FCE7F3 100%);
    border-color: var(--pink);
}
.input-section.pink::before { background: var(--pink); }

.input-section.purple {
    background: linear-gradient(135deg, #F5F3FF 0%, #EDE9FE 100%);
    border-color: var(--primary);
}
.input-section.purple::before { background: var(--primary); }

.input-section.gray {
    background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    border-color: var(--gray-300);
}
.input-section.gray::before { background: var(--gray-400); }

.input-section h3 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.input-section h3 span {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.input-section.blue h3 { color: var(--info-dark); }
.input-section.green h3 { color: var(--success-dark); }
.input-section.orange h3 { color: var(--warning-dark); }
.input-section.pink h3 { color: var(--pink-dark); }
.input-section.purple h3 { color: var(--primary-dark); }

/* ═══════════════════════════════════════════════════════════════════════════
   FORMS
═══════════════════════════════════════════════════════════════════════════ */
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
}

.form-group label {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.form-group .required {
    color: var(--error);
}

.form-group .hint {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0;
    line-height: 1.4;
}

.input-wrapper {
    display: flex;
    align-items: stretch;
    position: relative;
}

.input-wrapper input,
.input-wrapper select {
    flex: 1;
    min-width: 0;
    padding: 0.9375rem 1.125rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    transition: all var(--transition-normal);
    background: white;
}

.input-wrapper input:hover,
.input-wrapper select:hover {
    border-color: var(--gray-400);
}

.input-wrapper input:focus,
.input-wrapper select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(124, 58, 237, 0.12);
}

.input-wrapper input.error {
    border-color: var(--error);
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.12);
}

.input-wrapper .unit {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    font-weight: 600;
    color: var(--text-muted);
    pointer-events: none;
    font-size: 0.95rem;
}

/* Tabs */
.tabs {
    display: flex;
    gap: 4px;
    background: var(--gray-100);
    padding: 4px;
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
}

.tab {
    flex: 1;
    padding: 0.875rem 1.25rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.tab:hover {
    color: var(--text-primary);
    background: rgba(255, 255, 255, 0.6);
}

.tab.active {
    background: white;
    color: var(--primary);
    box-shadow: var(--shadow-md);
}

/* ═══════════════════════════════════════════════════════════════════════════
   BUTTONS
═══════════════════════════════════════════════════════════════════════════ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.9375rem 1.75rem;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    pointer-events: none;
}

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

.btn:active {
    transform: translateY(0);
    box-shadow: var(--shadow-md);
}

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

.btn-primary:hover {
    box-shadow: 0 8px 24px rgba(124, 58, 237, 0.4);
}

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

.btn-success:hover {
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.4);
}

.btn-info {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
    color: white;
}

.btn-warning, .btn-orange {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
    color: white;
}

.btn-pink {
    background: linear-gradient(135deg, var(--pink) 0%, var(--pink-dark) 100%);
    color: white;
}

.btn-secondary {
    background: white;
    color: var(--text-secondary);
    border: 2px solid var(--gray-300);
}

.btn-secondary::before {
    display: none;
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: var(--primary-bg);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-calculate {
    width: 100%;
    padding: 1.0625rem 1.5rem;
    font-size: 1.0625rem;
    margin-top: var(--spacing-lg);
}

.btn-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.btn-group .btn {
    flex: 1;
    min-width: 150px;
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESULTS SECTION
═══════════════════════════════════════════════════════════════════════════ */
.results-section {
    display: none;
    animation: slideIn 0.4s ease;
}

.results-section.visible {
    display: block;
}

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

/* Result Cards */
.result-card {
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border: 2px solid;
    position: relative;
}

.result-card.blue {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    border-color: var(--info);
}

.result-card.green {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
    border-color: var(--success);
}

.result-card.orange {
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
    border-color: var(--warning);
}

.result-card.purple {
    background: linear-gradient(135deg, #F5F3FF 0%, #EDE9FE 100%);
    border-color: var(--primary);
}

.result-card.gray {
    background: linear-gradient(135deg, #F9FAFB 0%, #F3F4F6 100%);
    border-color: var(--gray-300);
}

.result-card.red {
    background: linear-gradient(135deg, #FEF2F2 0%, #FEE2E2 100%);
    border-color: var(--error);
}

.result-card h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.result-card.blue h4 { color: var(--info-dark); }
.result-card.green h4 { color: var(--success-dark); }
.result-card.orange h4 { color: #92400E; }
.result-card.purple h4 { color: var(--primary-dark); }
.result-card.red h4 { color: var(--error-dark); }

/* Results Grid */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-lg);
}

.result-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.7);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-fast);
}

.result-item:hover {
    transform: translateY(-2px);
}

.result-item .label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-xs);
}

.result-item .value {
    font-size: 1.375rem;
    font-weight: 800;
    font-family: 'JetBrains Mono', monospace;
    color: var(--text-primary);
}

/* Big Number */
.big-number {
    text-align: center;
    padding: var(--spacing-xl);
}

.big-number .label {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.big-number .value {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 800;
    font-size: 2.5rem;
}

/* ═══════════════════════════════════════════════════════════════════════════
   TABLES
═══════════════════════════════════════════════════════════════════════════ */
.table-container {
    overflow-x: auto;
    margin: var(--spacing-md) 0;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    -webkit-overflow-scrolling: touch;
}

.data-table {
    width: 100%;
    min-width: 500px;
    border-collapse: collapse;
    background: white;
}

.data-table th,
.data-table td {
    padding: 1rem 1.125rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.data-table thead th {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: white;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.data-table thead th:first-child {
    border-radius: var(--radius-lg) 0 0 0;
}

.data-table thead th:last-child {
    border-radius: 0 var(--radius-lg) 0 0;
}

.data-table tbody tr {
    transition: background var(--transition-fast);
}

.data-table tbody tr:hover {
    background: var(--gray-50);
}

.data-table tbody tr.highlight-green {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
}

.data-table tbody tr.highlight-blue {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
}

.data-table tbody tr.highlight-orange {
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
}

.data-table tbody tr.highlight-purple {
    background: linear-gradient(135deg, #F5F3FF 0%, #EDE9FE 100%);
}

.data-table tbody tr.total-row {
    background: linear-gradient(135deg, var(--gray-900) 0%, var(--gray-800) 100%);
    color: white;
    font-weight: 700;
}

.data-table tbody tr.total-row td {
    border: none;
    font-size: 1rem;
}

.data-table td.number {
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
}

/* Entry Table */
.entry-table {
    width: 100%;
    background: white;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.entry-table th,
.entry-table td {
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--gray-200);
}

.entry-table thead th {
    background: var(--primary);
    color: white;
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
}

.entry-table td:nth-child(3),
.entry-table td:nth-child(4) {
    text-align: right;
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
}

.account-number {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    color: var(--primary);
}

/* Rate Badges */
.rate-badge {
    display: inline-block;
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
}

.rate-badge.green { background: var(--success); }
.rate-badge.blue { background: var(--info); }
.rate-badge.orange { background: var(--warning); }
.rate-badge.purple { background: var(--primary); }

/* ═══════════════════════════════════════════════════════════════════════════
   DOC SECTION
═══════════════════════════════════════════════════════════════════════════ */
.doc-section {
    background: var(--bg-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xl);
    border: 1px solid var(--gray-200);
}

.doc-section h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.doc-section .formula {
    background: linear-gradient(135deg, var(--gray-800) 0%, var(--gray-900) 100%);
    color: #67e8f9;
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    line-height: 1.9;
    white-space: pre-line;
    margin-bottom: var(--spacing-md);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

.doc-section p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.6;
}

.doc-section .reference {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 0.15rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    margin-right: var(--spacing-sm);
}

/* ═══════════════════════════════════════════════════════════════════════════
   INFO BOX
═══════════════════════════════════════════════════════════════════════════ */
.info-box {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    border: 1px solid var(--gray-200);
}

.info-box h5 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.info-box p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.info-box ul {
    margin: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
}

.info-box li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════════════
   SECTION DESCRIPTION
═══════════════════════════════════════════════════════════════════════════ */
.section-desc {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════════════
   ALERTS
═══════════════════════════════════════════════════════════════════════════ */
.alert {
    display: none;
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-lg);
    align-items: flex-start;
    gap: var(--spacing-md);
}

.alert.visible {
    display: flex;
}

.alert .icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.alert-info {
    background: linear-gradient(135deg, #EFF6FF 0%, #DBEAFE 100%);
    border: 2px solid var(--info);
    color: var(--info-dark);
}

.alert-warning {
    background: linear-gradient(135deg, #FFFBEB 0%, #FEF3C7 100%);
    border: 2px solid var(--warning);
    color: #92400E;
}

.alert-success {
    background: linear-gradient(135deg, #ECFDF5 0%, #D1FAE5 100%);
    border: 2px solid var(--success);
    color: #065F46;
}

.alert-error {
    background: linear-gradient(135deg, #FEF2F2 0%, #FEE2E2 100%);
    border: 2px solid var(--error);
    color: #991B1B;
}

/* ═══════════════════════════════════════════════════════════════════════════
   NOTIFICATIONS
═══════════════════════════════════════════════════════════════════════════ */
.notifications {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    pointer-events: none;
    max-width: 420px;
}

.notification {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--gray-800);
    color: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-2xl);
    pointer-events: auto;
    transform: translateX(120%);
    transition: transform var(--transition-slow);
}

.notification.show {
    transform: translateX(0);
}

.notification-success {
    background: linear-gradient(135deg, var(--success) 0%, var(--success-dark) 100%);
}

.notification-error {
    background: linear-gradient(135deg, var(--error) 0%, var(--error-dark) 100%);
}

.notification-warning {
    background: linear-gradient(135deg, var(--warning) 0%, var(--warning-dark) 100%);
}

.notification-info {
    background: linear-gradient(135deg, var(--info) 0%, var(--info-dark) 100%);
}

.notification-icon {
    font-size: 1.375rem;
}

.notification-message {
    flex: 1;
    font-weight: 600;
    font-size: 0.95rem;
}

.notification-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.7;
    transition: opacity var(--transition-fast);
    padding: 0;
    line-height: 1;
}

.notification-close:hover {
    opacity: 1;
}

/* ═══════════════════════════════════════════════════════════════════════════
   CHECKBOX GROUP
═══════════════════════════════════════════════════════════════════════════ */
.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.checkbox-group:hover {
    border-color: var(--success);
    background: #F0FDF4;
}

.checkbox-group input[type="checkbox"] {
    width: 1.5rem;
    height: 1.5rem;
    accent-color: var(--success);
    cursor: pointer;
    margin-top: 2px;
    flex-shrink: 0;
}

.checkbox-group .label-text {
    flex: 1;
}

.checkbox-group .label-text strong {
    display: block;
    color: var(--text-primary);
    font-size: 0.95rem;
    margin-bottom: 0.25rem;
}

.checkbox-group .label-text span {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ═══════════════════════════════════════════════════════════════════════════
   ANIMATIONS
═══════════════════════════════════════════════════════════════════════════ */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.animate-slide-in {
    animation: slideIn 0.4s ease forwards;
}

.animate-fade-in {
    animation: fadeIn 0.3s ease forwards;
}

/* Loading */
.loading-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 50vh;
    color: white;
    text-align: center;
}

.loading-spinner {
    font-size: 3rem;
    animation: pulse 1.5s ease-in-out infinite;
    margin-bottom: var(--spacing-md);
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE - TABLETTE (≤1024px)
═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
    :root {
        --header-height: 0px;
        --sidebar-width: 300px;
    }
    
    .site-header {
        display: none;
    }
    
    .sidebar {
        transform: translateX(-100%);
        top: 0;
        height: 100vh;
        height: 100dvh;
        z-index: 150;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay.active {
        display: block;
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: var(--spacing-md);
        padding-top: 0;
    }

    .mobile-header {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
        background: rgba(0, 0, 0, 0.4);
        backdrop-filter: blur(12px);
        border-radius: var(--radius-xl);
        margin-bottom: var(--spacing-lg);
        color: white;
        position: sticky;
        top: 0;
        z-index: 50;
        border: 1px solid rgba(255, 255, 255, 0.1);
    }

    .menu-toggle {
        background: white;
        border: none;
        width: 48px;
        height: 48px;
        border-radius: var(--radius-lg);
        font-size: 1.375rem;
        cursor: pointer;
        flex-shrink: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: var(--shadow-md);
        transition: all var(--transition-fast);
    }
    
    .menu-toggle:active {
        transform: scale(0.95);
    }

    .mobile-title {
        font-weight: 700;
        font-size: 1.125rem;
        flex: 1;
    }

    .tool-container {
        max-width: 100%;
    }
    
    .welcome-hero h1 {
        font-size: 2rem;
    }
    
    .welcome-stats {
        gap: var(--spacing-md);
    }

    .form-grid {
        grid-template-columns: 1fr;
    }
    
    .tool-item {
        padding: 0.75rem 0.75rem 0.75rem 2.25rem;
        min-height: 48px;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   RESPONSIVE - MOBILE (≤640px)
═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
    :root {
        --spacing-lg: 1.25rem;
        --spacing-xl: 1.5rem;
        --spacing-2xl: 2rem;
    }

    html, body {
        overflow-x: hidden !important;
    }
    
    .main-content {
        padding: var(--spacing-sm);
        width: 100%;
    }

    .tool-container {
        width: 100%;
        max-width: 100%;
    }

    .mobile-header {
        margin: 0 0 var(--spacing-md) 0;
        border-radius: var(--radius-lg);
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .sidebar {
        width: 85vw;
        max-width: 320px;
    }

    .tool-item {
        padding: 0.625rem 0.625rem 0.625rem 2rem;
        font-size: 0.85rem;
        gap: 0.5rem;
        min-height: 44px;
    }
    
    .tool-item .tool-icon {
        font-size: 1rem;
        width: 1.25rem;
        min-width: 1.25rem;
    }
    
    .tool-badge-popular {
        font-size: 0.75rem;
    }

    /* Welcome Screen Mobile */
    .welcome-screen {
        padding: var(--spacing-sm) 0;
    }

    .welcome-hero {
        padding: var(--spacing-lg);
        border-radius: var(--radius-xl);
    }
    
    .welcome-hero h1 {
        font-size: 1.625rem;
    }

    .welcome-subtitle {
        font-size: 1rem;
    }

    .welcome-icon {
        font-size: 3.5rem;
    }

    .welcome-stats {
        gap: var(--spacing-sm);
    }

    .welcome-stat {
        padding: var(--spacing-md);
        min-width: 100px;
    }

    .welcome-stat .stat-value {
        font-size: 1.75rem;
    }

    /* Grilles */
    .quick-tools-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .quick-tool-card {
        padding: var(--spacing-md);
    }

    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

    .category-card {
        padding: var(--spacing-md);
    }

    .category-card-icon {
        font-size: 2rem;
    }

    .category-card-name {
        font-size: 0.9rem;
    }

    /* Tool Cards */
    .tool-card {
        border-radius: var(--radius-xl);
    }

    .tool-card-header {
        padding: var(--spacing-md);
    }

    .tool-card-header .icon {
        font-size: 2rem;
    }

    .tool-card-header h2 {
        font-size: 1.125rem;
    }

    .tool-card-body {
        padding: var(--spacing-md);
    }

    /* Tool Header */
    .tool-header h1 {
        font-size: 1.5rem;
    }

    .tool-header p {
        font-size: 0.95rem;
    }

    /* Input Sections */
    .input-section {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }

    .input-section h3 {
        font-size: 0.95rem;
    }

    .form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .input-wrapper input,
    .input-wrapper select {
        padding: 0.8125rem 1rem;
        font-size: 1rem;
    }

    /* Tabs Mobile */
    .tabs {
        flex-direction: column;
        gap: 4px;
    }

    .tab {
        justify-content: center;
    }

    /* Results */
    .result-card {
        padding: var(--spacing-md);
        border-radius: var(--radius-lg);
    }

    .results-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .result-item .value {
        font-size: 1.25rem;
    }

    .big-number .value {
        font-size: 2rem;
    }

    /* Buttons */
    .btn {
        padding: 0.8125rem 1.25rem;
        font-size: 0.95rem;
    }

    .btn-group {
        flex-direction: column;
    }

    .btn-group .btn {
        width: 100%;
        min-width: unset;
    }

    /* Tables */
    .data-table th,
    .data-table td {
        padding: 0.625rem 0.5rem;
        font-size: 0.8rem;
    }

    /* Doc Section */
    .doc-section {
        padding: var(--spacing-md);
    }

    .doc-section .formula {
        font-size: 0.75rem;
        padding: var(--spacing-md);
    }

    /* Alerts */
    .alert {
        padding: var(--spacing-md);
    }

    /* Notifications */
    .notifications {
        left: var(--spacing-sm);
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
        max-width: none;
    }

    .notification {
        max-width: 100%;
        margin-left: 0;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   TRÈS PETITS ÉCRANS (≤380px)
═══════════════════════════════════════════════════════════════════════════ */
@media (max-width: 380px) {
    :root {
        --spacing-md: 0.75rem;
        --spacing-lg: 1rem;
        --spacing-xl: 1.25rem;
    }

    .welcome-hero h1 {
        font-size: 1.375rem;
    }

    .categories-grid {
        grid-template-columns: 1fr;
    }

    .welcome-stat .stat-value {
        font-size: 1.5rem;
    }

    .result-item .value {
        font-size: 1.125rem;
    }

    .input-wrapper input,
    .input-wrapper select {
        padding: 0.75rem;
        font-size: 0.95rem;
    }

    .btn {
        padding: 0.75rem 1rem;
        font-size: 0.9rem;
    }

    .tool-header h1 {
        font-size: 1.25rem;
    }

    .data-table th,
    .data-table td {
        padding: 0.5rem 0.375rem;
        font-size: 0.75rem;
    }
    
    .tool-item {
        padding: 0.5rem 0.5rem 0.5rem 1.75rem;
        font-size: 0.8rem;
        gap: 0.4rem;
        min-height: 40px;
    }
    
    .tool-item .tool-icon {
        font-size: 0.95rem;
        width: 1.125rem;
        min-width: 1.125rem;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   MOTION REDUCED
═══════════════════════════════════════════════════════════════════════════ */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ═══════════════════════════════════════════════════════════════════════════
   PRINT
═══════════════════════════════════════════════════════════════════════════ */
@media print {
    html, body {
        background: white !important;
    }

    .sidebar,
    .mobile-header,
    .btn-group,
    .notifications,
    .sidebar-overlay,
    .site-header,
    .site-footer {
        display: none !important;
    }

    .main-content {
        margin-left: 0 !important;
        padding: 0 !important;
        width: 100% !important;
    }

    .tool-card {
        box-shadow: none !important;
        border: 1px solid var(--gray-300) !important;
    }

    .results-section {
        display: block !important;
    }

    .result-card,
    .input-section {
        break-inside: avoid;
    }
}



/* ==========================================
   OPTIMISATIONS PERFORMANCE GOOGLE
   ========================================== */

/* 1. Évite les Layout Shifts (CLS) */
img, video, iframe {
    max-width: 100%;
    height: auto;
    aspect-ratio: attr(width) / attr(height); /* Réserve l'espace */
}

/* 2. Optimise le rendu des fonts */
body {
    text-rendering: optimizeSpeed;
    -webkit-font-smoothing: antialiased;
}

/* 3. Réduit les repaint sur les animations */
.sc-card,
.btn,
[class*="hover"] {
    will-change: transform;
    transform: translateZ(0); /* Active GPU */
}

/* 4. Masque le contenu non visible */
.lazy-section {
    content-visibility: auto;
    contain-intrinsic-size: 500px; /* Hauteur estimée */
}

/* 5. Optimise le scroll */
html {
    scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

#tool-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    
    /* 🚀 Optimisations supplémentaires */
    contain: layout style;  /* Isole le rendu = plus rapide */
    will-change: contents;  /* Prépare le navigateur aux changements */
}