.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    padding: var(--space-3) var(--space-6);
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-light);
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    height: 64px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

.header-menu-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.header-menu-btn:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

@media (max-width: 1024px) {
    .header-menu-btn {
        display: flex;
    }
}

.header-logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
}

.header-logo-icon {
    width: 28px;
    height: 28px;
    color: var(--primary-600);
}

.header-logo-text {
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

.header-search {
    display: flex;
    align-items: center;
    flex: 1;
    max-width: 560px;
    background: var(--gray-100);
    border-radius: var(--radius-full);
    padding: 0 var(--space-4);
    transition: all var(--transition-fast);
}

.header-search:focus-within {
    background: var(--bg-primary);
    box-shadow: 0 0 0 2px var(--primary-500);
}

.header-search-icon {
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.header-search-input {
    flex: 1;
    padding: var(--space-3) var(--space-3);
    border: none;
    background: transparent;
    font-size: var(--text-base);
    color: var(--text-primary);
    outline: none;
}

.header-search-input::placeholder {
    color: var(--text-tertiary);
}

@media (max-width: 768px) {
    .header-search {
        display: none;
    }
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.header-icon-btn {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.header-icon-btn:hover {
    background: var(--gray-100);
    color: var(--text-primary);
}

.header-notification-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    min-width: 18px;
    height: 18px;
    padding: 0 5px;
    font-size: 10px;
    font-weight: var(--font-semibold);
    color: white;
    background: var(--error-500);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-user {
    position: relative;
}

.header-user-btn {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    padding-right: var(--space-3);
    border-radius: var(--radius-full);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.header-user-btn:hover {
    background: var(--gray-100);
}

.header-user-name {
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    color: var(--text-primary);
}

@media (max-width: 640px) {
    .header-user-name {
        display: none;
    }
}

.header-dropdown {
    position: absolute;
    top: calc(100% + var(--space-2));
    right: 0;
    width: 280px;
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    overflow: hidden;
    animation: slideDown var(--transition-normal);
}

.header-dropdown-header {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4);
}

.header-dropdown-name {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
    margin: 0;
}

.header-dropdown-email {
    font-size: var(--text-xs);
    color: var(--text-tertiary);
    margin: 0;
}

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

.header-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--text-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    border: none;
    background: none;
    width: 100%;
    cursor: pointer;
}

.header-dropdown-item:hover {
    background: var(--gray-50);
    color: var(--text-primary);
}

.header-dropdown-logout {
    color: var(--error-500);
}

.header-dropdown-logout:hover {
    background: var(--error-50);
    color: var(--error-600);
}

.header-auth-buttons {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

@media (max-width: 640px) {
    .header-auth-buttons .btn:first-child {
        display: none;
    }
}