/* =================================
   RESPONSIVE HEADER SYSTEM
   ================================= */

/* Header amélioré */
.header {
    background: var(--color-background);
    border-bottom: var(--border-width) solid var(--color-border-light);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: var(--z-dropdown);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

/* =================================
   BRAND SECTION (Logo + Title)
   ================================= */

.brand-section {
    flex-shrink: 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-1px);
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-hover));
    border-radius: var(--border-radius);
    color: white;
    box-shadow: var(--shadow-sm);
}

.logo-text {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.logo-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    line-height: 1.2;
}

.logo-subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 500;
    line-height: 1;
}

/* =================================
   DESKTOP NAVIGATION
   ================================= */

.nav-desktop {
    display: flex;
    gap: var(--spacing-sm);
    align-items: center;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius-sm);
    white-space: nowrap;
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
    background: rgba(0, 102, 255, 0.1);
}

.nav-link span {
    display: inline;
}

/* =================================
   DROPDOWN NAVIGATION
   ================================= */

.nav-dropdown {
    position: relative;
}

.dropdown-toggle {
    cursor: pointer;
    background: none;
    border: none;
    font-family: inherit;
    font-size: inherit;
}

.dropdown-icon {
    transition: transform 0.2s ease;
}

.nav-dropdown.open .dropdown-icon {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + var(--spacing-sm));
    left: 0;
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border-light);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    min-width: 280px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.2s ease;
    z-index: var(--z-dropdown);
}

.nav-dropdown.open .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--border-radius-sm);
    transition: var(--transition);
    margin-bottom: var(--spacing-xs);
}

.dropdown-item:last-child {
    margin-bottom: 0;
}

.dropdown-item:hover:not(.disabled) {
    background: var(--color-surface-hover);
    color: var(--color-primary);
}

.dropdown-item.active {
    background: rgba(0, 102, 255, 0.1);
    color: var(--color-primary);
}

.dropdown-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.dropdown-item-content {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.dropdown-item-title {
    font-weight: 500;
    font-size: var(--font-size-sm);
    line-height: 1.3;
}

.dropdown-item-desc {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    line-height: 1.2;
}

.dropdown-divider {
    height: 1px;
    background: var(--color-border-light);
    margin: var(--spacing-sm) 0;
}

/* =================================
   HEADER ACTIONS
   ================================= */

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

.theme-toggle {
    background: none;
    border: var(--border-width) solid var(--color-border);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    color: var(--color-text-secondary);
}

.theme-toggle:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: var(--border-width) solid var(--color-border);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    color: var(--color-text-secondary);
}

.mobile-menu-toggle:hover {
    background: var(--color-surface-hover);
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* =================================
   MOBILE NAVIGATION
   ================================= */

.nav-mobile {
    position: fixed;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-top: var(--border-width) solid var(--color-border-light);
    box-shadow: var(--shadow-lg);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
    transform: translateY(0);
    transition: transform 0.3s ease;
    z-index: calc(var(--z-dropdown) - 1);
    display: none;
}

.nav-mobile.open {
    transform: translateY(-100%);
}

.mobile-nav-content {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--color-text);
    text-decoration: none;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-weight: 500;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background: var(--color-surface-hover);
    color: var(--color-primary);
}

.mobile-nav-text {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.mobile-nav-text small {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    font-weight: 400;
}

.mobile-nav-section {
    margin: var(--spacing-md) 0;
}

.mobile-nav-section-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 600;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-md);
    padding: 0 var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mobile-nav-subsection {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding-left: var(--spacing-lg);
    border-left: 2px solid var(--color-border-light);
}

/* =================================
   RESPONSIVE BREAKPOINTS
   ================================= */

/* Tablet */
@media (max-width: 1024px) {
    .nav-link span {
        display: none;
    }
    
    .nav-link {
        padding: var(--spacing-sm);
        width: 40px;
        height: 40px;
        justify-content: center;
    }
    
    .dropdown-menu {
        min-width: 240px;
    }
    
    .logo-text {
        display: none;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .nav-desktop {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .nav-mobile {
        display: block;
    }
    
    .logo-text {
        display: flex;
    }
    
    .header-content {
        gap: var(--spacing-sm);
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .header {
        padding: var(--spacing-sm) 0;
    }
    
    .logo-icon {
        width: 36px;
        height: 36px;
    }
    
    .logo-title {
        font-size: var(--font-size-base);
    }
    
    .mobile-nav-content {
        padding: var(--spacing-md);
    }
    
    .mobile-nav-link {
        padding: var(--spacing-sm) var(--spacing-md);
    }
}

/* =================================
   ANIMATIONS
   ================================= */

.animate-spin {
    animation: spin 1s linear infinite;
}

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

/* =================================
   ACCESSIBILITY IMPROVEMENTS
   ================================= */

@media (prefers-reduced-motion: reduce) {
    .header,
    .nav-link,
    .dropdown-menu,
    .mobile-nav-link,
    .theme-toggle,
    .mobile-menu-toggle,
    .logo {
        transition: none;
    }
    
    .animate-spin {
        animation: none;
    }
}

/* Focus states for keyboard navigation */
.nav-link:focus,
.dropdown-toggle:focus,
.theme-toggle:focus,
.mobile-menu-toggle:focus,
.mobile-nav-link:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .header {
        border-bottom-width: 2px;
    }
    
    .nav-link:hover,
    .nav-link.active {
        background: var(--color-primary);
        color: white;
    }
}

/* =================================
   TOAST STYLES (UPDATED)
   ================================= */

.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 400px;
}

@media (max-width: 768px) {
    .toast-container {
        top: calc(80px + var(--spacing-md));
        right: var(--spacing-md);
        left: var(--spacing-md);
        max-width: none;
    }
}

.toast {
    background: var(--color-surface);
    border: var(--border-width) solid var(--color-border-light);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease-out;
    overflow: hidden;
}

.toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.toast-icon {
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
    font-size: var(--font-size-sm);
    color: var(--color-text);
}

.toast-close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    transition: var(--transition);
    padding: var(--spacing-xs);
    border-radius: var(--border-radius-sm);
}

.toast-close:hover {
    color: var(--color-text);
    background: var(--color-surface-hover);
}

.toast-success {
    border-left: 4px solid var(--color-success);
}

.toast-error {
    border-left: 4px solid var(--color-error);
}

.toast-warning {
    border-left: 4px solid var(--color-warning);
}

.toast-info {
    border-left: 4px solid var(--color-info);
}

.toast-success .toast-icon {
    color: var(--color-success);
}

.toast-error .toast-icon {
    color: var(--color-error);
}

.toast-warning .toast-icon {
    color: var(--color-warning);
}

.toast-info .toast-icon {
    color: var(--color-info);
}

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