.header {
    background: #ffffff;
    border-bottom: none;
    padding: 20px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    backdrop-filter: blur(10px);
    z-index: 100;
    box-shadow: none;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

.header-logo-area {
    flex: 0 0 auto;
    min-width: 50px;
}

.header-nav {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-primary);
    padding: 10px 20px;
    font-weight: 500;
    font-size: 0.95em;
    font-family: var(--font-family-primary);
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    letter-spacing: 0.01em;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-brand-primary), var(--color-brand-accent));
    border-radius: 2px;
    transition: transform 0.3s ease;
}

.nav-link:hover {
    color: var(--color-brand-primary);
    background: rgba(28, 119, 166, 0.05);
}

.nav-link:hover::before {
    transform: translateX(-50%) scaleX(1);
}

.header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    padding: 10px;
    background: #ffffff;
    border: 1px solid var(--color-border-default);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.mobile-nav-toggle:hover {
    background: #ffffff;
    border-color: var(--color-border-strong);
}

.mobile-nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-text-primary);
    border-radius: 1px;
    transition: all 0.3s ease;
    font-family: var(--font-family-primary);
}

.language-selector {
    position: relative;
}

.language-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    background: #ffffff;
    border-radius: 8px;
    cursor: pointer;
    font-family: var(--font-family-primary);
    font-size: 0.9em;
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all 0.3s ease;
}

.language-toggle:hover {
    background: #ffffff;
    border-color: var(--color-border-strong);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.language-flag {
    width: 24px;
    height: 18px;
    border-radius: 3px;
    object-fit: cover;
}

.language-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    min-width: 180px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    z-index: 1000;
}

.language-dropdown.open {
    display: block;
    animation: slideDown 0.3s ease;
}

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

.language-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 0.9em;
    font-weight: 500;
    font-family: var(--font-family-primary);
    transition: all 0.2s ease;
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.language-option:last-child {
    border-bottom: none;
}

.language-option:hover {
    background: #ffffff;
    text-decoration: none;
}

.language-option.active {
    background: rgba(28, 119, 166, 0.05);
    color: var(--color-brand-primary);
}

.language-option .language-flag {
    flex-shrink: 0;
}

.header-user-avatar {
    display: flex;
    align-items: center;
}

.header-user-avatar-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    overflow: hidden;
    text-decoration: none;
    border: 2px solid var(--color-border-default);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.header-user-avatar-link:hover {
    border-color: var(--color-brand-primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4), var(--glow-primary);
    transform: scale(1.05);
}

.header-user-avatar-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.header-user-avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-brand-primary), var(--color-brand-secondary));
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 16px;
    font-family: var(--font-family-primary);
    text-transform: uppercase;
}

@media (max-width: 768px) {
    .header {
        padding: 14px 16px;
        max-width: 100%;
    }
    
    .mobile-nav-toggle {
        display: flex;
        padding: 12px;
        min-width: 48px;
        min-height: 48px;
        justify-content: center;
        align-items: center;
    }
    
    .mobile-nav-toggle span {
        width: 24px;
        height: 3px;
    }
    
    .header-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: #ffffff;
        border-top: 1px solid rgba(255, 255, 255, 0.3);
        padding: 12px;
        gap: 4px;
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    }
    
    .header-nav.open {
        display: flex;
    }
    
    .nav-link {
        padding: 16px 18px;
        width: 100%;
        text-align: left;
        font-size: 1rem;
        min-height: 48px;
        display: flex;
        align-items: center;
        margin-bottom: 4px;
    }
    
    .header-user-avatar {
        display: none;
    }
    
    .language-dropdown {
        right: 0;
        left: auto;
        min-width: 160px;
    }
    
    .language-toggle {
        padding: 12px 16px;
        font-size: 0.95em;
        min-height: 44px;
        min-width: 80px;
    }
    
    .language-flag {
        width: 20px;
        height: 15px;
    }
}

@media (max-width: 576px) {
    .header {
        padding: 12px 12px;
        max-width: 100%;
    }
    
    .header-actions {
        gap: 8px;
    }
    
    .mobile-nav-toggle {
        padding: 12px;
        min-width: 48px;
        min-height: 48px;
    }
    
    .mobile-nav-toggle span {
        width: 22px;
        height: 3px;
    }
    
    .nav-link {
        padding: 18px 16px;
        font-size: 1rem;
        min-height: 52px;
        display: flex;
        align-items: center;
        margin-bottom: 6px;
    }
    
    .language-toggle {
        padding: 12px 14px;
        font-size: 0.9em;
        gap: 8px;
        min-height: 48px;
        min-width: 75px;
    }
    
    .language-flag {
        width: 18px;
        height: 14px;
    }
    
    .language-dropdown {
        min-width: 140px;
    }
    
    .language-option {
        padding: 16px 18px;
        font-size: 0.95em;
        gap: 12px;
        min-height: 52px;
        display: flex;
        align-items: center;
    }
}