/* ==================== HEADER ==================== */
header {
    background: linear-gradient(180deg, var(--bg-elevated) 0%, rgba(16, 18, 20, 0.95) 100%);
    padding-top: max(env(safe-area-inset-top), 12px);  /* ✅ Minimum 12px pour Android */
    border-bottom: 1px solid rgba(68, 85, 102, 0.3);
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 12px var(--shadow);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 24px;
}

.logo {
    font-size: 28px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, #00c9ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    cursor: pointer;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.05);
}

.nav-links {
    display: flex;
    gap: 8px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
    font-weight: 500;
    font-size: 15px;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 6px;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 2px;
    background: var(--primary);
    transition: transform 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
    background: rgba(59, 130, 246, 0.12);
}

.nav-links a:hover::after {
    transform: translateX(-50%) scaleX(1);
}

#authButtons {
    display: flex;
    gap: 12px;
}

#userMenu {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 16px 8px 20px;
    border-radius: 50px;
    background: rgba(59, 131, 246, 0.04);
    border: 2px solid rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
    cursor: pointer;
}

#userMenu:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

#usernameDisplay {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 15px;
    white-space: nowrap;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid rgba(59, 130, 246, 0.3);
    box-shadow: 0 0 8px rgba(59, 130, 246, 0.3);
    transition: all 0.3s ease;
}

#userMenu:hover .user-avatar {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.6);
}

.user-avatar-placeholder {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    border: 2px solid var(--primary);
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
    transition: all 0.3s ease;
}

#userMenu:hover .user-avatar-placeholder {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.6);
}