:root {
    /* ==========================================
       1. COULEURS PRIMAIRES & SECONDAIRES
       ========================================== */
    --color-primary: #1b61d3;
    --red-color-primary: rgb(184, 13, 42);
    --color-primary-hover: rgb(0, 0, 110);
    --color-secondary: rgb(240, 140, 0);
    --color-primary-focus-rgba: rgba(27, 97, 211, 0.15); /* Halos au focus des champs */
    
    /* Variables de design moderne basées sur vos tons */
    --color-primary-dark: #1b61d3;    /* Slate 800 - Fond Sidebar moderne */
    --color-accent-blue: #3b82f6;    /* Bleu moderne épuré pour les badges */
    
    /* ==========================================
       2. PALETTE NEUTRE & TEXTES
       ========================================== */
    --color-bg-main: #f8fafc;        /* Slate 50 - Fond d'écran très pro et doux */
    --color-bg-card: rgb(255, 255, 255);
    --color-text-dark: rgb(33, 37, 41);
    --color-text-muted: rgb(108, 117, 125);
    --color-border: #e2e8f0;         /* Bordures plus fines et discrètes */
    --color-white: #ffffff;
    
    --color-sidebar-link-hover: #d4d4d4;
    --color-dropdown-toggle: #cbd5e1;
    --color-dropdown-arrow: #64748b;
    --color-dropdown-link: #dfe5ec;

    /* ==========================================
       3. ÉTATS SYSTÈMES & BADGES
       ========================================== */
    --color-success: rgb(40, 167, 69);
    --color-danger: rgb(220, 53, 69);
    --color-warning: rgb(255, 193, 7);

    --color-badge-bg: #eff6ff;
    --color-badge-border: #dbeafe;
    
    --color-logout-hover-bg: #fef2f2;
    --color-logout-hover-border: #fee2e2;

    /* Alertes Succès / Info */
    --color-alert-success-bg: #ecfdf5;
    --color-alert-success-text: #065f46;
    --color-alert-success-border: #a7f3d0;

    /* Alertes Danger / Erreur */
    --color-alert-danger-bg: #fef2f2;
    --color-alert-danger-text: #991b1b;
    --color-alert-danger-border: #fca5a5;

    --color-status-danger-bg: rgba(220, 53, 69, 0.1);
    --color-status-danger-border: rgba(220, 53, 69, 0.2);
    --color-status-success-bg: rgba(40, 167, 69, 0.1);
    --color-status-success-border: rgba(40, 167, 69, 0.2);

    /* ==========================================
       4. TRANSPARENCES & OMBRES (RGBA)
       ========================================== */
    --color-sidebar-border-rgba: rgba(255, 255, 255, 0.05);
    --color-sidebar-brand-border-rgba: rgba(255, 255, 255, 0.06);
    --color-sidebar-brand-grad-1-rgba: rgba(255, 255, 255, 0.02);
    --color-sidebar-brand-grad-2-rgba: rgba(255, 255, 255, 0);
    --color-sidebar-link-hover-rgba: rgba(255, 255, 255, 0.05);
    --color-dropdown-toggle-hover-rgba: rgba(255, 255, 255, 0.03);
    --color-dropdown-open-bg-rgba: rgba(0, 0, 0, 0.15);
    --color-dropdown-menu-border-rgba: rgba(255, 255, 255, 0.1);
    --color-topbar-shadow-rgba: rgba(0, 0, 0, 0.02);
    
    --color-shadow-sm-1: rgba(0, 0, 0, 0.05);
    --color-shadow-sm-2: rgba(0, 0, 0, 0.03);
    --color-shadow-md-1: rgba(0, 0, 0, 0.05);
    --color-shadow-md-2: rgba(0, 0, 0, 0.03);

    /* ==========================================
       5. TYPOGRAPHIE & ESPACEMENTS
       ========================================== */
    --font-family-base: 'Inter', 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --transition-fast: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px var(--color-shadow-sm-1), 0 1px 2px var(--color-shadow-sm-2);
    --shadow-md: 0 4px 6px -1px var(--color-shadow-md-1), 0 2px 4px -1px var(--color-shadow-md-2);
}

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

html, body {
    height: 100%;
    font-family: var(--font-family-base);
    font-size: 15px;
    line-height: 1.6;
    background-color: var(--color-bg-main);
    color: var(--color-text-dark);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* LAYOUT GRID MACRO */
.erp-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    grid-template-rows: 70px 1fr;
    grid-template-areas: 
        "sidebar topbar"
        "sidebar main";
    height: 100vh;
}

/* ==========================================================================
   COMPOSANT SIDEBAR RÉVISÉ (LOGO & MENUS DÉROULANTS NATIFS)
   ========================================================================== */
.erp-sidebar { 
    grid-area: sidebar; 
    background-color: var(--color-primary-dark); 
    color: var(--color-white);
    display: flex;
    flex-direction: column;
    border-right: 1px solid var(--color-sidebar-border-rgba);
}

/* Zone Marque & Logo */
.sidebar-brand {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-sidebar-brand-border-rgba);
    background: linear-gradient(135deg, var(--color-sidebar-brand-grad-1-rgba) 0%, var(--color-sidebar-brand-grad-2-rgba) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
}

.sidebar-logo {
    max-width: 100%;
    height: auto;
    max-height: 55px;
    object-fit: contain;
}

/* Navigation */
.sidebar-nav {
    padding: var(--spacing-md) 0;
    overflow-y: auto;
}

.sidebar-nav ul {
    list-style: none;
    padding: 0 var(--spacing-sm);
}

/* Éléments de liens directs standard */
.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    padding: 0.75rem var(--spacing-md);
    color: var(--color-white);
    font-size: 0.9rem;
    font-weight: 500;
    text-decoration: none;
    border-radius: var(--radius-sm);
    margin-bottom: 2px;
    position: relative;
    transition: var(--transition-fast);
}

.sidebar-nav .nav-link:hover {
    background-color: var(--color-sidebar-link-hover-rgba);
    color: var(--color-sidebar-link-hover);
}

.sidebar-nav .nav-link:hover::before {
    content: "";
    position: absolute;
    left: 0;
    top: 25%;
    height: 50%;
    width: 3px;
    background-color: var(--color-secondary);
    border-radius: 0 4px 4px 0;
}

.sidebar-nav .nav-icon {
    margin-right: var(--spacing-sm);
    font-size: 1.1rem;
    opacity: 0.9;
}

/* --- STRUCTURES DES MENUS DÉROULANTS NATIFS --- */
.nav-dropdown {
    margin-bottom: var(--spacing-xs);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

/* Le bouton parent cliquable */
.dropdown-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.8rem var(--spacing-md);
    color: var(--color-dropdown-toggle);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

/* Cache la flèche native sur Safari */
.dropdown-toggle::-webkit-details-marker {
    display: none;
}

.dropdown-toggle:hover {
    background-color: var(--color-dropdown-toggle-hover-rgba);
    color: var(--color-white);
}

/* Indicateur Flèche personnalisé en CSS pure */
.dropdown-arrow {
    width: 6px;
    height: 6px;
    border-right: 2px solid var(--color-dropdown-arrow);
    border-bottom: 2px solid var(--color-dropdown-arrow);
    transform: rotate(45deg);
    transition: transform 0.2s ease;
    margin-right: var(--spacing-xs);
}

/* Comportement visuel lorsque le menu déroulant est ouvert */
.nav-dropdown[open] {
    background-color: var(--color-dropdown-open-bg-rgba);
}

.nav-dropdown[open] .dropdown-toggle {
    color: var(--color-white);
}

.nav-dropdown[open] .dropdown-arrow {
    transform: rotate(-135deg);
    border-color: var(--color-secondary);
}

/* Sous-conteneur des liens du sous-menu */
.dropdown-menu {
    padding: var(--spacing-xs) 0 var(--spacing-sm) var(--spacing-md) !important;
    border-left: 1px dashed var(--color-dropdown-menu-border-rgba);
    margin-left: var(--spacing-lg);
}

.dropdown-menu .nav-link {
    padding: 0.55rem var(--spacing-md);
    font-size: 0.85rem;
    color: var(--color-dropdown-link);
}

.dropdown-menu .nav-link:hover {
    background-color: transparent;
    color: var(--color-secondary);
}

/* Supprime la barre d'accentuation gauche sur les sous-liens */
.dropdown-menu .nav-link:hover::before {
    display: none;
}

/* COMPOSANT TOPBAR */
.erp-topbar { 
    grid-area: topbar; 
    background-color: var(--color-bg-card); 
    border-bottom: 1px solid var(--color-border); 
    box-shadow: 0 1px 2px 0 var(--color-topbar-shadow-rgba);
}

.topbar-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 var(--spacing-xl);
}

.topbar-context {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--red-color-primary);
}

.topbar-user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-role-badge {
    background-color: var(--color-badge-bg);
    color: var(--color-accent-blue);
    padding: 0.35rem 0.75rem;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid var(--color-badge-border);
}

.user-name {
    font-size: 0.9rem;
    color: var(--color-text-dark);
}

.user-filiale-text {
    color: var(--color-text-muted);
}

.form-logout-inline {
    display: inline;
}

.btn-logout {
    background-color: transparent;
    color: var(--color-text-muted) !important;
    padding: 0.45rem 0.85rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid var(--color-border);
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition-fast);
}

.btn-logout:hover {
    background-color: var(--color-logout-hover-bg);
    color: var(--color-danger) !important;
    border-color: var(--color-logout-hover-border);
}

/* MAIN CONTENT CONTAINER */
.erp-main { 
    grid-area: main; 
    padding: var(--spacing-xl); 
    overflow-y: auto; 
    background-color: var(--color-bg-main);
}

/* ALERTE MESSAGES SYSTEME */
.messages-container {
    margin-bottom: var(--spacing-lg);
}

.message-alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
    border: 1px solid transparent;
    box-shadow: var(--shadow-sm);
}

.message-alert.success, .message-alert.info {
    background-color: var(--color-alert-success-bg);
    color: var(--color-alert-success-text);
    border-color: var(--color-alert-success-border);
}

.message-alert.danger, .message-alert.error {
    background-color: var(--color-alert-danger-bg);
    color: var(--color-alert-danger-text);
    border-color: var(--color-alert-danger-border);
}

/* WIDGET CARDS */
.dashboard-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.kgi-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

/* Style pour le bouton profil dans la topbar */
.btn-profile {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    margin-right: 0.5rem;
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

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

/* Ajustement pour que le lien et le bouton de déconnexion soient alignés */
.topbar-user-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}