/* ========================================
   REFONTE COMPLÈTE - HEADER MODERNE
   ======================================== */

/* Variables CSS pour cohérence */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --secondary-color: #f59e0b;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Structure principale - Header moderne avec glassmorphism */
.site-header {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.site-header:hover {
    box-shadow: var(--shadow-md);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    height: 90px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2.5rem;
}

/* Logo et nom - Design amélioré */
.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
    position: relative;
}

.logo-wrapper {
    width: 70px;
    height: 70px;
    position: relative;
    perspective: 1000px;
}

.logo-3d {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.6s ease;
}

.logo-wrapper:hover .logo-3d {
    transform: rotateY(180deg);
}

.logo-face {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    backface-visibility: hidden;
    position: absolute;
    top: 0;
    left: 0;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.logo-face.usa {
    transform: rotateY(180deg);
}

.logo-wrapper:hover .logo-face {
    box-shadow: var(--shadow-lg);
}

.site-name {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    letter-spacing: -0.5px;
}

/* Navigation - Design moderne */
.main-nav ul {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    margin: 0;
    padding: 0;
    align-items: center;
}

.main-nav a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.3s ease;
    border-radius: 2px;
}

.main-nav a:hover {
    color: var(--primary-color);
}

.main-nav a:hover::after {
    width: 100%;
}

/* Sous-menus */
.main-nav li {
    position: relative;
}

.main-nav .submenu {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    left: -10px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    list-style: none;
    margin: 0;
    padding: 0.75rem 0;
    z-index: 100;
    min-width: 200px;
    animation: fadeInDown 0.3s ease;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.main-nav .submenu li a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.main-nav .submenu li a:hover {
    background: linear-gradient(90deg, rgba(37, 99, 235, 0.1), rgba(245, 158, 11, 0.1));
    padding-left: 2rem;
}

.main-nav li:hover > .submenu {
    display: block;
}

/* Boutons d'action */
.header-actions {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    border: none;
    background: transparent;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 10px;
    transition: var(--transition);
    position: relative;
}

.icon-btn:hover {
    background: rgba(37, 99, 235, 0.1);
    transform: translateY(-2px);
}

.icon-btn img {
    width: 28px;
    height: 28px;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.icon-btn:hover img {
    transform: scale(1.1);
}

/* Sélecteur de langue */
.language-selector {
    position: relative;
    display: inline-block;
}

.language-selector button {
    background: transparent;
    border: 2px solid var(--border-color);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 8px;
    transition: var(--transition);
}

.language-selector button:hover {
    border-color: var(--primary-color);
    background: rgba(37, 99, 235, 0.05);
}

.language-selector img {
    width: 28px;
    height: 20px;
    border-radius: 4px;
}

.language-selector ul {
    position: absolute;
    right: 0;
    top: calc(100% + 10px);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    list-style: none;
    padding: 0.5rem 0;
    margin: 0;
    width: 180px;
    box-shadow: var(--shadow-lg);
    z-index: 10;
    animation: fadeInDown 0.3s ease;
}

.language-selector li {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    cursor: pointer;
    transition: var(--transition);
}

.language-selector li:hover {
    background: rgba(37, 99, 235, 0.1);
}

.language-selector li img {
    width: 24px;
    height: 18px;
    margin-right: 0.75rem;
    border-radius: 3px;
}

.hidden {
    display: none;
}

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

.logout-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.profile-avatar-header {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary-color);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.profile-avatar-header:hover {
    border-color: var(--secondary-color);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

/* Responsive */
@media (max-width: 1024px) {
    .header-container {
        padding: 0 1.5rem;
        height: 80px;
    }
    
    .main-nav ul {
        gap: 1.5rem;
    }
    
    .site-name {
        font-size: 1.5rem;
    }
}

@media (max-width: 768px) {
    .header-container {
        flex-wrap: wrap;
        height: auto;
        padding: 1rem;
    }
    
    .main-nav ul {
        gap: 1rem;
        flex-wrap: wrap;
    }
    
    .site-name {
        font-size: 1.25rem;
    }
}